exp pull: update for index fetch

* secondary sorting by rev alphanumerically. to introduce determinism

* add UT

.dvc/.gitignore

@@ -1,12 +0,0 @@
-/state
-/lock
-/config.local
-/updater
-/updater.lock
-/state-journal
-/state-wal
-/cache
-/pkg
-/repos
-/tmp
-/experiments

.dvc/config

@@ -1,4 +0,0 @@
-['remote "dvc"']
-url = https://remote.dvc.org/dvc
-[core]
-remote = dvc

.github/mergify.yml

@@ -0,0 +1,10 @@
+pull_request_rules:
+  - name: backport patches to 2.x
+    conditions:
+      - base=main
+      - label=backport
+    actions:
+      backport:
+        branches:
+          - "2.x"
+        title: ({{ destination_branch }}) {{ title }}

.github/workflows/codeql.yml

@@ -2,7 +2,7 @@ name: "CodeQL"
 
 on:
   push:
-    branches: ["main"]
+    branches: ["main", "2.x"]
   pull_request:
     branches: ["main"]
   schedule:

.github/workflows/packages.yaml

@@ -11,68 +11,10 @@ permissions:  # added using https://github.com/step-security/secure-workflows
   contents: read
 
 jobs:
-  binary:
-    permissions:
-      contents: write  # for actions/upload-release-asset to upload release asset
-    strategy:
-      matrix:
-        include:
-         - {pkg: "deb",  os: "ubuntu-20.04", asset: "dvc_${{ github.event.release.tag_name }}_amd64.deb"}
-         - {pkg: "rpm", os: "ubuntu-20.04", asset: "dvc-${{ github.event.release.tag_name }}-1.x86_64.rpm"}
-         - {pkg: "osxpkg", os: "macos-11", asset: "dvc-${{ github.event.release.tag_name }}.pkg"}
-         - {pkg: "exe",  os: "windows-2019", asset: "dvc-${{ github.event.release.tag_name }}.exe"}
-
-    name: ${{ matrix.pkg }}
-    runs-on: ${{ matrix.os }}
-    steps:
-    - uses: actions/checkout@v3
-      with:
-          fetch-depth: 0
-
-    - name: Set up Python 3.10
-      uses: actions/setup-python@v4
-      with:
-        python-version: "3.10"
-        cache: pip
-        cache-dependency-path: |
-          pyproject.toml
-          scripts/build-requirements.txt
-
-    - name: Set up Ruby 2.6
-      uses: ruby/setup-ruby@v1
-      if: matrix.pkg != 'exe'
-      with:
-        ruby-version: '2.6'
-
-    - name: Install fpm
-      if: matrix.pkg != 'exe'
-      run: gem install --no-document fpm
-
-    - name: Install deps
-      run: |
-        pip install --upgrade pip wheel setuptools
-        pip install .[all]
-        pip install -r scripts/build-requirements.txt
-
-    - name: Pull images
-      run: dvc pull
-
-    - name: Build ${{ matrix.pkg }}
-      run: python scripts/build.py ${{ matrix.pkg }}
-
-    - name: Publish ${{ matrix.pkg }}
-      if: github.event_name == 'release'
-      uses: actions/[email protected]
-      env:
-        GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
-      with:
-        upload_url: ${{ github.event.release.upload_url }}
-        asset_path: scripts/${{ matrix.pkg == 'exe' && 'innosetup' || 'fpm' }}/${{ matrix.asset }}
-        asset_name: ${{ matrix.asset }}
-        asset_content_type: binary/octet-stream
-
   pip:
     runs-on: ubuntu-20.04
+    permissions:
+      id-token: write
     steps:
     - uses: actions/checkout@v3
       with:
@@ -100,13 +42,10 @@ jobs:
     - name: Publish packages to PyPI
       if: github.event_name == 'release'
       uses: pypa/gh-action-pypi-publish@release/v1
-      with:
-        password: ${{ secrets.PYPI_TOKEN }}
 
     - name: Publish to Test PyPI
       if: ${{ github.event_name == 'release' || (github.event_name == 'push' && github.ref == 'refs/heads/main') }}
       uses: pypa/gh-action-pypi-publish@release/v1
       with:
-        password: ${{ secrets.TEST_PYPI_TOKEN }}
         repository_url: https://test.pypi.org/legacy/
         skip_existing: true

.github/workflows/tests.yaml

@@ -2,7 +2,7 @@ name: Tests
 
 on:
   push:
-    branches: [main]
+    branches: [main, 2.x]
   pull_request:
   schedule:
     - cron: '5 1 * * *'  # every day at 01:05
@@ -42,6 +42,8 @@ jobs:
     - uses: pre-commit/[email protected]
     - name: run tests
       timeout-minutes: 40
+      env:
+        PYTHONUTF8: 1
       run: >
         pytest -n=logical --timeout=300 --durations=100
         --cov --cov-report=xml --cov-report=term

dvc/__init__.py

@@ -4,6 +4,7 @@ DVC
 Make your data science projects reproducible and shareable.
 """
 import dvc.logger
+from dvc.build import PKG  # noqa: F401
 from dvc.version import __version__, version_tuple  # noqa: F401
 
 dvc.logger.setup()

dvc/annotations.py

@@ -17,20 +17,26 @@ class Annotation:
     labels: List[str] = field(default_factory=list)
     meta: Dict[str, Any] = field(default_factory=dict)
 
-    def update(self, **kwargs) -> "Annotation":
-        for attr, value in kwargs.items():
-            if value and hasattr(self, attr):
-                setattr(self, attr, value)
-        return self
-
     def to_dict(self) -> Dict[str, str]:
         return compact(asdict(self))
 
 
 @dataclass
-class Artifact(Annotation):
+class Artifact:
     PARAM_PATH: ClassVar[str] = "path"
-    path: Optional[str] = None
+    PARAM_DESC: ClassVar[str] = "desc"
+    PARAM_TYPE: ClassVar[str] = "type"
+    PARAM_LABELS: ClassVar[str] = "labels"
+    PARAM_META: ClassVar[str] = "meta"
+
+    path: str
+    desc: Optional[str] = None
+    type: Optional[str] = None  # noqa: A003
+    labels: List[str] = field(default_factory=list)
+    meta: Dict[str, Any] = field(default_factory=dict)
+
+    def to_dict(self) -> Dict[str, str]:
+        return compact(asdict(self))
 
 
 ANNOTATION_FIELDS = [field.name for field in fields(Annotation)]

dvc/api/__init__.py

@@ -2,13 +2,17 @@ from dvc.fs.dvc import _DVCFileSystem as DVCFileSystem
 
 from .data import open  # pylint: disable=redefined-builtin
 from .data import get_url, read
-from .experiments import exp_save, make_checkpoint
+from .experiments import exp_save, exp_show
+from .scm import all_branches, all_commits, all_tags
 from .show import metrics_show, params_show
 
 __all__ = [
+    "all_branches",
+    "all_commits",
+    "all_tags",
     "exp_save",
+    "exp_show",
     "get_url",
-    "make_checkpoint",
     "open",
     "params_show",
     "metrics_show",

dvc/api/data.py

@@ -73,6 +73,7 @@ def open(  # noqa, pylint: disable=redefined-builtin
     remote: Optional[str] = None,
     mode: str = "r",
     encoding: Optional[str] = None,
+    config: Optional[Dict[str, Any]] = None,
 ):
     """
     Opens a file tracked in a DVC project.
@@ -114,6 +115,8 @@ def open(  # noqa, pylint: disable=redefined-builtin
             Defaults to None.
             This should only be used in text mode.
             Mirrors the namesake parameter in builtin `open()`_.
+        config(dict, optional): config to be passed to the DVC repository.
+            Defaults to None.
 
     Returns:
         _OpenContextManager: A context manager that generatse a corresponding
@@ -209,14 +212,24 @@ def open(  # noqa, pylint: disable=redefined-builtin
         "rev": rev,
         "mode": mode,
         "encoding": encoding,
+        "config": config,
     }
     return _OpenContextManager(_open, args, kwargs)
 
 
-def _open(path, repo=None, rev=None, remote=None, mode="r", encoding=None):
-    repo_kwargs: Dict[str, Any] = {"subrepos": True, "uninitialized": True}
+def _open(path, repo=None, rev=None, remote=None, mode="r", encoding=None, config=None):
     if remote:
-        repo_kwargs["config"] = {"core": {"remote": remote}}
+        if config is not None:
+            raise ValueError(
+                "can't specify both `remote` and `config` at the same time"
+            )
+        config = {"core": {"remote": remote}}
+
+    repo_kwargs: Dict[str, Any] = {
+        "subrepos": True,
+        "uninitialized": True,
+        "config": config,
+    }
 
     with Repo.open(repo, rev=rev, **repo_kwargs) as _repo:
         with _wrap_exceptions(_repo, path):
@@ -251,13 +264,19 @@ def _open(path, repo=None, rev=None, remote=None, mode="r", encoding=None):
                 raise DvcIsADirectoryError(f"'{path}' is a directory") from exc
 
 
-def read(path, repo=None, rev=None, remote=None, mode="r", encoding=None):
+def read(path, repo=None, rev=None, remote=None, mode="r", encoding=None, config=None):
     """
     Returns the contents of a tracked file (by DVC or Git). For Git repos, HEAD
     is used unless a rev argument is supplied. The default remote is tried
     unless a remote argument is supplied.
     """
     with open(
-        path, repo=repo, rev=rev, remote=remote, mode=mode, encoding=encoding
+        path,
+        repo=repo,
+        rev=rev,
+        remote=remote,
+        mode=mode,
+        encoding=encoding,
+        config=config,
     ) as fd:
         return fd.read()

dvc/api/experiments.py

@@ -1,37 +1,9 @@
-import builtins
-import os
-from time import sleep
-from typing import List, Optional
+from typing import Dict, List, Optional, Union
+
+from rich.text import Text
 
-from dvc.env import DVC_CHECKPOINT, DVC_ROOT
 from dvc.repo import Repo
-from dvc.stage.monitor import CheckpointTask
-
-
-def make_checkpoint():
-    """
-    Signal DVC to create a checkpoint experiment.
-
-    If the current process is being run from DVC, this function will block
-    until DVC has finished creating the checkpoint. Otherwise, this function
-    will return immediately.
-    """
-    if os.getenv(DVC_CHECKPOINT) is None:
-        return
-
-    root_dir = os.getenv(DVC_ROOT, Repo.find_root())
-    signal_file = os.path.join(
-        root_dir, Repo.DVC_DIR, "tmp", CheckpointTask.SIGNAL_FILE
-    )
-
-    with builtins.open(signal_file, "w", encoding="utf-8") as fobj:
-        # NOTE: force flushing/writing empty file to disk, otherwise when
-        # run in certain contexts (pytest) file may not actually be written
-        fobj.write("")
-        fobj.flush()
-        os.fsync(fobj.fileno())
-    while os.path.exists(signal_file):
-        sleep(0.1)
+from dvc.repo.experiments.show import tabulate
 
 
 def exp_save(
@@ -69,3 +41,80 @@ def exp_save(
         return repo.experiments.save(
             name=name, force=force, include_untracked=include_untracked
         )
+
+
+def _postprocess(exp_rows):
+    for exp_row in exp_rows:
+        for k, v in exp_row.items():
+            if isinstance(v, Text):
+                v_str = str(v)
+                try:
+                    exp_row[k] = float(v_str)
+                except ValueError:
+                    exp_row[k] = v_str
+
+            if not exp_row[k]:
+                exp_row[k] = None
+
+    return exp_rows
+
+
+def exp_show(
+    repo: Optional[str] = None,
+    revs: Optional[Union[str, List[str]]] = None,
+    num: int = 1,
+    param_deps: bool = False,
+    force: bool = False,
+    config: Optional[Dict] = None,
+) -> List[Dict]:
+    """Get DVC experiments tracked in `repo`.
+
+    Without arguments, this function will retrieve all experiments derived from
+    the Git `HEAD`.
+
+    See the options below to customize the experiments retrieved.
+
+    Args:
+        repo (str, optional): location of the DVC repository.
+            Defaults to the current project (found by walking up from the
+            current working directory tree).
+            It can be a URL or a file system path.
+            Both HTTP and SSH protocols are supported for online Git repos
+            (e.g. [user@]server:project.git).
+        revs (Union[str, List[str]], optional): Git revision(s) (e.g. branch,
+            tag, SHA commit) to use as a reference point to start listing
+            experiments.
+            Defaults to `None`, which will use `HEAD` as starting point.
+        num (int, optional): show experiments from the last `num` commits
+            (first parents) starting from the `revs` baseline.
+            Give a negative value to include all first-parent commits (similar
+            to `git log -n`).
+            Defaults to 1.
+        param_deps (bool, optional): include only parameters that are stage
+            dependencies.
+            Defaults to `False`.
+        force (bool, optional): force re-collection of experiments instead of
+            loading from internal experiments cache.
+            DVC caches `exp_show` data for completed experiments to improve
+            performance of subsequent calls.
+            When `force` is specified, DVC will reload all experiment data and
+            ignore any previously cached results.
+            Defaults to `False`.
+        config (dict, optional): config to be passed through to DVC project.
+            Defaults to `None`.
+
+    Returns:
+        List[Dict]: Each item in the list will contain a dictionary with
+            the info for an individual experiment.
+            See Examples below.
+    """
+    with Repo.open(repo, config=config) as _repo:
+        experiments = _repo.experiments.show(
+            revs=revs,
+            num=num,
+            param_deps=param_deps,
+            force=force,
+        )
+        td, _ = tabulate(experiments, fill_value=None)
+
+        return _postprocess(td.as_dict())

dvc/api/scm.py

@@ -0,0 +1,54 @@
+from typing import List, Optional
+
+from dvc.repo import Repo
+
+
+def all_branches(repo: Optional[str] = None) -> List[str]:
+    """Get all Git branches in a DVC repository.
+
+    Args:
+        repo (str, optional): location of the DVC repository.
+            Defaults to the current project (found by walking up from the
+            current working directory tree).
+            It can be a URL or a file system path.
+            Both HTTP and SSH protocols are supported for online Git repos
+            (e.g. [user@]server:project.git).
+    Returns:
+        List[str]: Names of the Git branches.
+    """
+    with Repo.open(repo) as _repo:
+        return _repo.scm.list_branches()
+
+
+def all_commits(repo: Optional[str] = None) -> List[str]:
+    """Get all Git commits in a DVC repository.
+
+    Args:
+        repo (str, optional): location of the DVC repository.
+            Defaults to the current project (found by walking up from the
+            current working directory tree).
+            It can be a URL or a file system path.
+            Both HTTP and SSH protocols are supported for online Git repos
+            (e.g. [user@]server:project.git).
+    Returns:
+        List[str]: SHAs of the Git commits.
+    """
+    with Repo.open(repo) as _repo:
+        return _repo.scm.list_all_commits()
+
+
+def all_tags(repo: Optional[str] = None) -> List[str]:
+    """Get all Git tags in a DVC repository.
+
+    Args:
+        repo (str, optional): location of the DVC repository.
+            Defaults to the current project (found by walking up from the
+            current working directory tree).
+            It can be a URL or a file system path.
+            Both HTTP and SSH protocols are supported for online Git repos
+            (e.g. [user@]server:project.git).
+    Returns:
+        List[str]: Names of the Git tags.
+    """
+    with Repo.open(repo) as _repo:
+        return _repo.scm.list_tags()

dvc/api/show.py

@@ -41,6 +41,7 @@ def metrics_show(
     *targets: str,
     repo: Optional[str] = None,
     rev: Optional[str] = None,
+    config: Optional[Dict] = None,
 ) -> Dict:
     """Get metrics tracked in `repo`.
 
@@ -69,6 +70,8 @@ def metrics_show(
             hash or a dvc experiment name.
             If `repo` is not a Git repo, this option is ignored.
             If `None`, the current working tree will be used.
+        config (dict, optional): config to be passed through to DVC project.
+            Defaults to `None`.
 
     Returns:
         Dict: See Examples below.
@@ -136,7 +139,7 @@ def metrics_show(
         https://git-scm.com/docs/revisions
     """
 
-    with Repo.open(repo) as _repo:
+    with Repo.open(repo, config=config) as _repo:
         metrics = _repo.metrics.show(
             targets=targets,
             revs=rev if rev is None else [rev],
@@ -157,6 +160,7 @@ def params_show(
     stages: Optional[Union[str, Iterable[str]]] = None,
     rev: Optional[str] = None,
     deps: bool = False,
+    config: Optional[Dict] = None,
 ) -> Dict:
     """Get parameters tracked in `repo`.
 
@@ -195,6 +199,8 @@ def params_show(
         deps (bool, optional): Whether to retrieve only parameters that are
             stage dependencies or not.
             Defaults to `False`.
+        config (dict, optional): config to be passed through to DVC project.
+            Defaults to `None`.
 
     Returns:
         Dict: See Examples below.
@@ -379,7 +385,7 @@ def params_show(
     if isinstance(stages, str):
         stages = [stages]
 
-    with Repo.open(repo) as _repo:
+    with Repo.open(repo, config=config) as _repo:
         params = _repo.params.show(
             revs=rev if rev is None else [rev],
             targets=targets,

dvc/build.py

@@ -0,0 +1,10 @@
+from typing import Optional
+
+try:
+    # file is created during dvc build
+    # pylint:disable=unused-import
+    from . import _build  # type: ignore[attr-defined, import]
+
+    PKG: Optional[str] = _build.PKG  # type: ignore[assignment]
+except ImportError:
+    PKG = None  # type: ignore[assignment]

dvc/cachemgr.py

@@ -1,10 +1,24 @@
 import os
+from typing import TYPE_CHECKING, Optional, Tuple
 
 from dvc.fs import GitFileSystem, Schemes
 from dvc_data.hashfile.db import get_odb
+from dvc_data.hashfile.hash import DEFAULT_ALGORITHM
+
+if TYPE_CHECKING:
+    from dvc.repo import Repo
+
+LEGACY_HASH_NAMES = {"md5-dos2unix", "params"}
 
 
-def _get_odb(repo, settings, fs=None):
+def _get_odb(
+    repo,
+    settings,
+    fs=None,
+    prefix: Optional[Tuple[str, ...]] = None,
+    hash_name: Optional[str] = None,
+    **kwargs,
+):
     from dvc.fs import get_cloud_fs
 
     if not settings:
@@ -12,18 +26,16 @@ def _get_odb(repo, settings, fs=None):
 
     cls, config, fs_path = get_cloud_fs(repo, **settings)
     fs = fs or cls(**config)
+    if prefix:
+        fs_path = fs.path.join(fs_path, *prefix)
+    if hash_name:
+        config["hash_name"] = hash_name
     return get_odb(fs, fs_path, state=repo.state, **config)
 
 
 class CacheManager:
     CACHE_DIR = "cache"
-    CLOUD_SCHEMES = [
-        Schemes.S3,
-        Schemes.GS,
-        Schemes.SSH,
-        Schemes.HDFS,
-        Schemes.WEBHDFS,
-    ]
+    FILES_DIR = "files"
 
     def __init__(self, repo):
         self._repo = repo
@@ -53,25 +65,74 @@ class CacheManager:
         if not isinstance(repo.fs, GitFileSystem):
             kwargs["fs"] = repo.fs
 
-        odb = _get_odb(repo, settings, **kwargs)
+        odb = _get_odb(
+            repo,
+            settings,
+            prefix=(self.FILES_DIR, DEFAULT_ALGORITHM),
+            **kwargs,
+        )
         self._odb["repo"] = odb
         self._odb[Schemes.LOCAL] = odb
+        legacy_odb = _get_odb(repo, settings, hash_name="md5-dos2unix", **kwargs)
+        self._odb["legacy"] = legacy_odb
 
     def _init_odb(self, schemes):
         for scheme in schemes:
             remote = self.config.get(scheme)
             settings = {"name": remote} if remote else None
-            self._odb[scheme] = _get_odb(self._repo, settings)
+            self._odb[scheme] = _get_odb(
+                self._repo,
+                settings,
+                prefix=(self.FILES_DIR, DEFAULT_ALGORITHM),
+            )
 
     def __getattr__(self, name):
-        if name not in self._odb and name in self.CLOUD_SCHEMES:
-            self._init_odb([name])
-
         try:
             return self._odb[name]
         except KeyError as exc:
             raise AttributeError from exc
 
     def by_scheme(self):
-        self._init_odb(self.CLOUD_SCHEMES)
         yield from self._odb.items()
+
+    @property
+    def local_cache_dir(self) -> str:
+        """Return base local cache directory without any prefixes.
+
+        (i.e. `dvc cache dir`).
+        """
+        return self.legacy.path
+
+
+def migrate_2_to_3(repo: "Repo", dry: bool = False):
+    """Migrate legacy 2.x objects to 3.x cache.
+
+    Legacy 'md5-dos2unix' objects will be re-hashed with 'md5', added to 3.x cache,
+    and then a link from the legacy 2.x location to the 3.x location will be created.
+    """
+    from dvc.fs.callbacks import TqdmCallback
+    from dvc.ui import ui
+    from dvc_data.hashfile.db.migrate import migrate, prepare
+
+    src = repo.cache.legacy
+    dest = repo.cache.local
+    if dry:
+        oids = list(src._list_oids())  # pylint: disable=protected-access
+        ui.write(
+            f"{len(oids)} files will be re-hashed and migrated to the DVC 3.0 cache "
+            "location."
+        )
+        return
+
+    with TqdmCallback(
+        desc="Computing DVC 3.0 hashes",
+        unit="files",
+    ) as cb:
+        migration = prepare(src, dest, callback=cb)
+
+    with TqdmCallback(
+        desc="Migrating to DVC 3.0 cache",
+        unit="files",
+    ) as cb:
+        count = migrate(migration, callback=cb)
+    ui.write(f"Migrated {count} files to DVC 3.0 cache location.")

dvc/cli/__init__.py

@@ -75,7 +75,7 @@ def _log_exceptions(exc: Exception) -> Optional[int]:
     from dvc.fs import AuthError, ConfigError, RemoteMissingDepsError
 
     if isinstance(exc, RemoteMissingDepsError):
-        from dvc.utils.pkg import PKG
+        from dvc import PKG
 
         proto = exc.protocol
         by_pkg = {
@@ -83,9 +83,9 @@ def _log_exceptions(exc: Exception) -> Optional[int]:
             "conda": f"conda install -c conda-forge dvc-{proto}",
         }
 
-        cmd = by_pkg.get(PKG)
-        if cmd:
+        if PKG in by_pkg:
             link = format_link("https://dvc.org/doc/install")
+            cmd = by_pkg.get(PKG)
             hint = (
                 "To install dvc with those dependencies, run:\n"
                 "\n"
@@ -190,8 +190,7 @@ def main(argv=None):  # noqa: C901, PLR0912, PLR0915
         if level and level <= logging.DEBUG:
             from platform import platform, python_implementation, python_version
 
-            from dvc import __version__
-            from dvc.utils.pkg import PKG
+            from dvc import PKG, __version__
 
             pyv = " ".join([python_implementation(), python_version()])
             pkg = f" ({PKG})" if PKG else ""
@@ -245,7 +244,7 @@ def main(argv=None):  # noqa: C901, PLR0912, PLR0915
     finally:
         logger.setLevel(outer_log_level)
 
-        from dvc.external_repo import clean_repos
+        from dvc.repo.open_repo import clean_repos
 
         # Remove cached repos in the end of the call, these are anonymous
         # so won't be reused by any other subsequent run anyway.

dvc/cli/actions.py

@@ -1,20 +0,0 @@
-from argparse import _AppendAction
-
-
-class CommaSeparatedArgs(_AppendAction):  # pylint: disable=protected-access
-    def __call__(self, parser, namespace, values, option_string=None):  # noqa: ARG002
-        from funcy import ldistinct
-
-        items = getattr(namespace, self.dest) or []
-        items.extend(map(str.strip, values.split(",")))
-        setattr(namespace, self.dest, ldistinct(items))
-
-
-class KeyValueArgs(_AppendAction):
-    def __call__(self, parser, namespace, values, option_string=None):  # noqa: ARG002
-        items = getattr(namespace, self.dest) or {}
-        for value in filter(bool, values):
-            key, _, value = value.partition("=")
-            items[key.strip()] = value
-
-        setattr(namespace, self.dest, items)

dvc/cli/parser.py

@@ -41,7 +41,6 @@ from dvc.commands import (
     remove,
     repro,
     root,
-    run,
     stage,
     unprotect,
     update,
@@ -62,7 +61,6 @@ COMMANDS = [
     remove,
     move,
     unprotect,
-    run,
     repro,
     data_sync,
     gc,

dvc/commands/add.py

@@ -2,68 +2,61 @@ import argparse
 import logging
 
 from dvc.cli import completion
-from dvc.cli.actions import KeyValueArgs
 from dvc.cli.command import CmdBase
 from dvc.cli.utils import append_doc_link
 
 logger = logging.getLogger(__name__)
 
 
-def _add_annotating_args(parser: argparse.ArgumentParser) -> None:
-    parser.add_argument(
-        "--desc",
-        type=str,
-        metavar="<text>",
-        help="User description of the data.",
-    )
-    parser.add_argument(
-        "--meta",
-        metavar="key=value",
-        nargs=1,
-        action=KeyValueArgs,
-        help="Custom metadata to add to the data.",
-    )
-    parser.add_argument(
-        "--label",
-        dest="labels",
-        type=str,
-        action="append",
-        metavar="<str>",
-        help="Label for the data.",
-    )
-    parser.add_argument(
-        "--type",
-        type=str,
-        metavar="<str>",
-        help="Type of the data.",
-    )
-
-
 class CmdAdd(CmdBase):
+    def validate_args(self) -> None:
+        from dvc.exceptions import InvalidArgumentError
+
+        args = self.args
+        invalid_opt = None
+
+        if args.to_remote or args.out:
+            message = "{option} can't be used with "
+            message += "--to-remote" if args.to_remote else "--out"
+            if len(args.targets) != 1:
+                invalid_opt = "multiple targets"
+            elif args.glob:
+                invalid_opt = "--glob option"
+            elif args.no_commit:
+                invalid_opt = "--no-commit option"
+        else:
+            message = "{option} can't be used without --to-remote"
+            if args.remote:
+                invalid_opt = "--remote"
+            elif args.remote_jobs:
+                invalid_opt = "--remote-jobs"
+
+        if invalid_opt is not None:
+            raise InvalidArgumentError(message.format(option=invalid_opt))
+
     def run(self):
-        from dvc.exceptions import DvcException, RecursiveAddingWhileUsingFilename
+        from dvc.exceptions import DvcException, InvalidArgumentError
 
         try:
-            if len(self.args.targets) > 1 and self.args.file:
-                raise RecursiveAddingWhileUsingFilename()
+            self.validate_args()
+        except InvalidArgumentError:
+            logger.exception("")
+            return 1
 
+        try:
             self.repo.add(
                 self.args.targets,
-                recursive=self.args.recursive,
                 no_commit=self.args.no_commit,
-                fname=self.args.file,
-                external=self.args.external,
                 glob=self.args.glob,
-                desc=self.args.desc,
                 out=self.args.out,
-                type=self.args.type,
-                labels=self.args.labels,
-                meta=self.args.meta,
                 remote=self.args.remote,
                 to_remote=self.args.to_remote,
-                jobs=self.args.jobs,
+                remote_jobs=self.args.remote_jobs,
+                force=self.args.force,
             )
-
+        except FileNotFoundError:
+            logger.exception("")
+            return 1
         except DvcException:
             logger.exception("")
             return 1
@@ -80,36 +73,18 @@ def add_parser(subparsers, parent_parser):
         help=ADD_HELP,
         formatter_class=argparse.RawDescriptionHelpFormatter,
     )
-    parser.add_argument(
-        "-R",
-        "--recursive",
-        action="store_true",
-        default=False,
-        help="Recursively add files under directory targets.",
-    )
     parser.add_argument(
         "--no-commit",
         action="store_true",
         default=False,
         help="Don't put files/directories into cache.",
     )
-    parser.add_argument(
-        "--external",
-        action="store_true",
-        default=False,
-        help="Allow targets that are outside of the DVC repository.",
-    )
     parser.add_argument(
         "--glob",
         action="store_true",
         default=False,
         help="Allows targets containing shell-style wildcards.",
     )
-    parser.add_argument(
-        "--file",
-        help="Specify name of the .dvc file this command will generate.",
-        metavar="<filename>",
-    )
     parser.add_argument(
         "-o",
         "--out",
@@ -129,8 +104,7 @@ def add_parser(subparsers, parent_parser):
         metavar="<name>",
     )
     parser.add_argument(
-        "-j",
-        "--jobs",
+        "--remote-jobs",
         type=int,
         help=(
             "Only used along with '--to-remote'. "
@@ -140,8 +114,13 @@ def add_parser(subparsers, parent_parser):
         ),
         metavar="<number>",
     )
-
-    _add_annotating_args(parser)
+    parser.add_argument(
+        "-f",
+        "--force",
+        action="store_true",
+        default=False,
+        help="Override local file or folder if exists.",
+    )
     parser.add_argument(
         "targets", nargs="+", help="Input files/directories to add."
     ).complete = completion.FILE

dvc/commands/cache.py

@@ -2,6 +2,7 @@ import argparse
 import os
 
 from dvc.cli import completion
+from dvc.cli.command import CmdBase
 from dvc.cli.utils import append_doc_link, fix_subparsers
 from dvc.commands.config import CmdConfig
 from dvc.ui import ui
@@ -36,6 +37,14 @@ class CmdCacheDir(CmdConfig):
         return 0
 
 
+class CmdCacheMigrate(CmdBase):
+    def run(self):
+        from dvc.cachemgr import migrate_2_to_3
+
+        migrate_2_to_3(self.repo, dry=self.args.dry)
+        return 0
+
+
 def add_parser(subparsers, parent_parser):
     from dvc.commands.config import parent_config_parser
 
@@ -54,8 +63,6 @@ def add_parser(subparsers, parent_parser):
         help="Use `dvc cache CMD --help` for command-specific help.",
     )
 
-    fix_subparsers(cache_subparsers)
-
     parent_cache_config_parser = argparse.ArgumentParser(
         add_help=False, parents=[parent_config_parser]
     )
@@ -86,3 +93,23 @@ def add_parser(subparsers, parent_parser):
         nargs="?",
     ).complete = completion.DIR
     cache_dir_parser.set_defaults(func=CmdCacheDir)
+
+    CACHE_MIGRATE_HELP = "Migrate cached files to the DVC 3.0 cache location."
+    cache_migrate_parser = cache_subparsers.add_parser(
+        "migrate",
+        parents=[parent_parser],
+        description=append_doc_link(CACHE_HELP, "cache/migrate"),
+        help=CACHE_MIGRATE_HELP,
+        formatter_class=argparse.RawDescriptionHelpFormatter,
+    )
+    cache_migrate_parser.add_argument(
+        "--dry",
+        help=(
+            "Only print actions which would be taken without actually migrating "
+            "any data."
+        ),
+        action="store_true",
+    )
+    cache_migrate_parser.set_defaults(func=CmdCacheMigrate)
+
+    fix_subparsers(cache_subparsers)

dvc/commands/dag.py

@@ -176,7 +176,6 @@ def add_parser(subparsers, parent_parser):
     )
     dag_parser.add_argument(
         "--md",
-        "--show-md",
         action="store_true",
         default=False,
         dest="markdown",

dvc/commands/data.py

@@ -1,14 +1,11 @@
 import argparse
 import logging
-from operator import itemgetter
-from typing import TYPE_CHECKING, Any, Dict, Iterable, Set
+from typing import TYPE_CHECKING
 
 from funcy import chunks, compact, log_durations
 
-from dvc.cli import completion
-from dvc.cli.actions import CommaSeparatedArgs
 from dvc.cli.command import CmdBase
-from dvc.cli.utils import append_doc_link, fix_subparsers, hide_subparsers_from_help
+from dvc.cli.utils import append_doc_link, fix_subparsers
 from dvc.ui import ui
 from dvc.utils import colorize
 
@@ -117,6 +114,7 @@ class CmdDataStatus(CmdBase):
             status = self.repo.data_status(
                 granular=self.args.granular,
                 untracked_files=self.args.untracked_files,
+                not_in_remote=self.args.not_in_remote,
                 remote_refresh=self.args.remote_refresh,
             )
 
@@ -131,63 +129,6 @@ class CmdDataStatus(CmdBase):
         return self._show_status(status)
 
 
-class CmdDataLs(CmdBase):
-    @staticmethod
-    def _show_table(
-        d: Iterable[Dict[str, Any]],
-        filter_types: Set[str],
-        filter_labels: Set[str],
-        markdown: bool = False,
-    ) -> None:
-        from rich.style import Style
-
-        from dvc.compare import TabularData
-
-        td = TabularData(
-            columns=["Path", "Type", "Labels", "Description"], fill_value="-"
-        )
-        for entry in sorted(d, key=itemgetter("path")):
-            typ = entry.get("type", "")
-            desc = entry.get("desc", "-")
-            labels = entry.get("labels", [])
-
-            if filter_types and typ not in filter_types:
-                continue
-            if filter_labels and filter_labels.isdisjoint(labels):
-                continue
-
-            rich_label = ui.rich_text()
-            for index, label in enumerate(labels):
-                if index:
-                    rich_label.append(",")
-                style = Style(bold=label in filter_labels, color="green")
-                rich_label.append(label, style=style)
-
-            if markdown and desc:
-                desc = desc.partition("\n")[0]
-
-            path = ui.rich_text(entry["path"], style="cyan")
-            type_style = Style(bold=typ in filter_types, color="yellow")
-            typ = ui.rich_text(entry.get("type", ""), style=type_style)
-            td.append([path, typ or "-", rich_label or "-", desc])
-
-        td.render(markdown=markdown, rich_table=True)
-
-    def run(self):
-        from dvc.repo.data import ls
-
-        filter_labels = set(self.args.labels)
-        filter_types = set(self.args.type)
-        d = ls(self.repo, targets=self.args.targets, recursive=self.args.recursive)
-        self._show_table(
-            d,
-            filter_labels=filter_labels,
-            filter_types=filter_types,
-            markdown=self.args.markdown,
-        )
-        return 0
-
-
 def add_parser(subparsers, parent_parser):
     data_parser = subparsers.add_parser(
         "data",
@@ -216,13 +157,6 @@ def add_parser(subparsers, parent_parser):
         default=False,
         help="Show output in JSON format.",
     )
-    data_status_parser.add_argument(
-        "--show-json",
-        action="store_true",
-        default=False,
-        dest="json",
-        help=argparse.SUPPRESS,
-    )
     data_status_parser.add_argument(
         "--granular",
         action="store_true",
@@ -244,57 +178,15 @@ def add_parser(subparsers, parent_parser):
         help="Show untracked files.",
     )
     data_status_parser.add_argument(
-        "--remote-refresh",
+        "--not-in-remote",
         action="store_true",
         default=False,
-        help="Refresh remote index.",
+        help="Show files not in remote.",
+    )
+    data_status_parser.add_argument(
+        "--no-remote-refresh",
+        dest="remote_refresh",
+        action="store_false",
+        help="Use cached remote index (don't check remote).",
     )
     data_status_parser.set_defaults(func=CmdDataStatus)
-
-    DATA_LS_HELP = "List data tracked by DVC with its metadata."
-    data_ls_parser = data_subparsers.add_parser(
-        "ls",
-        aliases=["list"],
-        parents=[parent_parser],
-        description=append_doc_link(DATA_LS_HELP, "data/ls"),
-        formatter_class=argparse.RawDescriptionHelpFormatter,
-        add_help=False,
-    )
-    data_ls_parser.add_argument(
-        "--md",
-        "--show-md",
-        dest="markdown",
-        action="store_true",
-        default=False,
-        help="Show tabulated output in the Markdown format (GFM).",
-    )
-    data_ls_parser.add_argument(
-        "--type",
-        action=CommaSeparatedArgs,
-        default=[],
-        help="Comma-separated list of type to filter.",
-    )
-    data_ls_parser.add_argument(
-        "--labels",
-        action=CommaSeparatedArgs,
-        default=[],
-        help="Comma-separated list of labels to filter.",
-    )
-    data_ls_parser.add_argument(
-        "-R",
-        "--recursive",
-        action="store_true",
-        default=False,
-        help="Recursively list from the specified directories.",
-    )
-    data_ls_parser.add_argument(
-        "targets",
-        default=None,
-        nargs="*",
-        help=(
-            "Limit command scope to these tracked files/directories, "
-            ".dvc files, or stage names."
-        ),
-    ).complete = completion.DVCFILES_AND_STAGE
-    data_ls_parser.set_defaults(func=CmdDataLs)
-    hide_subparsers_from_help(data_subparsers)

dvc/commands/data_sync.py

@@ -403,7 +403,6 @@ def add_parser(subparsers, _parent_parser):
     )
     status_parser.add_argument(
         "--json",
-        "--show-json",
         action="store_true",
         default=False,
         help="Show status in JSON format.",

dvc/commands/diff.py

@@ -184,7 +184,6 @@ def add_parser(subparsers, parent_parser):
     )
     diff_parser.add_argument(
         "--json",
-        "--show-json",
         help="Format the output into a JSON",
         action="store_true",
         default=False,
@@ -197,7 +196,6 @@ def add_parser(subparsers, parent_parser):
     )
     diff_parser.add_argument(
         "--md",
-        "--show-md",
         help="Show tabulated output in the Markdown format (GFM).",
         action="store_true",
         dest="markdown",

dvc/commands/experiments/__init__.py

@@ -7,8 +7,6 @@ from dvc.commands.experiments import (
     clean,
     diff,
     exec_run,
-    gc,
-    init,
     ls,
     pull,
     push,
@@ -25,8 +23,6 @@ SUB_COMMANDS = [
     clean,
     diff,
     exec_run,
-    gc,
-    init,
     ls,
     pull,
     push,
@@ -82,6 +78,7 @@ def add_rev_selection_flags(
     experiments_subcmd_parser.add_argument(
         "--rev",
         type=str,
+        action="append",
         default=None,
         help=msg,
         metavar="<commit>",

dvc/commands/experiments/diff.py

@@ -83,14 +83,12 @@ def add_parser(experiments_subparsers, parent_parser):
     )
     experiments_diff_parser.add_argument(
         "--json",
-        "--show-json",
         action="store_true",
         default=False,
         help="Show output in JSON format.",
     )
     experiments_diff_parser.add_argument(
         "--md",
-        "--show-md",
         action="store_true",
         default=False,
         dest="markdown",

dvc/commands/experiments/exec_run.py

@@ -20,6 +20,7 @@ class CmdExecutorRun(CmdBaseNoRepo):
             log_level=logger.getEffectiveLevel(),
             infofile=self.args.infofile,
             copy_paths=self.args.copy_paths,
+            message=self.args.message,
         )
         return 0
 
@@ -47,4 +48,11 @@ def add_parser(experiments_subparsers, parent_parser):
             " Only used if `--temp` or `--queue` is specified."
         ),
     )
+    exec_run_parser.add_argument(
+        "-M",
+        "--message",
+        type=str,
+        default=None,
+        help="Custom commit message to use when committing the experiment.",
+    )
     exec_run_parser.set_defaults(func=CmdExecutorRun)

dvc/commands/experiments/gc.py

@@ -1,146 +0,0 @@
-import argparse
-import logging
-
-from dvc.cli.command import CmdBase
-from dvc.cli.utils import append_doc_link
-from dvc.exceptions import InvalidArgumentError
-from dvc.ui import ui
-
-logger = logging.getLogger(__name__)
-
-
-def _raise_error_if_all_disabled(**kwargs):
-    if not any(kwargs.values()):
-        raise InvalidArgumentError(
-            "Either of `-w|--workspace`, `-a|--all-branches`, `-T|--all-tags`,"
-            " `--all-commits` or `--date` needs to be set."
-        )
-
-
-class CmdExperimentsGC(CmdBase):
-    def run(self):
-        _raise_error_if_all_disabled(
-            all_branches=self.args.all_branches,
-            all_tags=self.args.all_tags,
-            all_commits=self.args.all_commits,
-            commit_date=self.args.commit_date,
-            workspace=self.args.workspace,
-        )
-
-        msg = "This will remove all experiments except those derived from "
-
-        msg += "the workspace"
-        if self.args.all_commits:
-            msg += " and all git commits"
-        else:
-            if self.args.all_branches and self.args.all_tags:
-                msg += " and all git branches and tags"
-            elif self.args.all_branches:
-                msg += " and all git branches"
-            elif self.args.all_tags:
-                msg += " and all git tags"
-
-            if self.args.commit_date:
-                msg += f" and all git commits before date {self.args.commit_date}"
-        msg += " of the current repo."
-
-        if self.args.queued:
-            msg += " Run queued experiments will be preserved."
-        else:
-            msg += " Run queued experiments will be removed."
-
-        logger.warning(msg)
-
-        msg = "Are you sure you want to proceed?"
-        if not self.args.force and not ui.confirm(msg):
-            return 1
-
-        removed = self.repo.experiments.gc(
-            all_branches=self.args.all_branches,
-            all_tags=self.args.all_tags,
-            all_commits=self.args.all_commits,
-            workspace=self.args.workspace,
-            commit_date=self.args.commit_date,
-            queued=self.args.queued,
-        )
-
-        if removed:
-            ui.write(
-                f"Removed {removed} experiments.",
-                "To remove unused cache files",
-                "use 'dvc gc'.",
-            )
-        else:
-            ui.write("No experiments to remove.")
-        return 0
-
-
-def add_parser(experiments_subparsers, parent_parser):
-    EXPERIMENTS_GC_HELP = "Garbage collect unneeded experiments."
-    EXPERIMENTS_GC_DESCRIPTION = (
-        "Removes all experiments which are not derived"
-        " from the specified Git revisions."
-    )
-    experiments_gc_parser = experiments_subparsers.add_parser(
-        "gc",
-        parents=[parent_parser],
-        description=append_doc_link(EXPERIMENTS_GC_DESCRIPTION, "exp/gc"),
-        help=EXPERIMENTS_GC_HELP,
-        formatter_class=argparse.RawDescriptionHelpFormatter,
-    )
-    experiments_gc_parser.add_argument(
-        "-w",
-        "--workspace",
-        action="store_true",
-        default=False,
-        help="Keep experiments derived from the current workspace.",
-    )
-    experiments_gc_parser.add_argument(
-        "-a",
-        "--all-branches",
-        action="store_true",
-        default=False,
-        help="Keep experiments derived from the tips of all Git branches.",
-    )
-    experiments_gc_parser.add_argument(
-        "-T",
-        "--all-tags",
-        action="store_true",
-        default=False,
-        help="Keep experiments derived from all Git tags.",
-    )
-    experiments_gc_parser.add_argument(
-        "-A",
-        "--all-commits",
-        action="store_true",
-        default=False,
-        help="Keep experiments derived from all Git commits.",
-    )
-    experiments_gc_parser.add_argument(
-        "--date",
-        type=str,
-        dest="commit_date",
-        metavar="<YYYY-MM-DD>",
-        default=None,
-        help=(
-            "Keep experiments from the commits after (inclusive) a certain "
-            "date. Date must match the extended ISO 8601 format (YYYY-MM-DD)."
-        ),
-    )
-    experiments_gc_parser.add_argument(
-        "--queued",
-        action="store_true",
-        default=False,
-        help=(
-            "Keep queued experiments (experiments run queue will be cleared "
-            "by default)."
-        ),
-    )
-    experiments_gc_parser.add_argument(
-        "-f",
-        "--force",
-        action="store_true",
-        default=False,
-        help="Force garbage collection - automatically agree to all prompts.",
-    )
-    experiments_gc_parser.set_defaults(func=CmdExperimentsGC)

dvc/commands/experiments/init.py

@@ -1,219 +0,0 @@
-import argparse
-import logging
-from typing import TYPE_CHECKING, List
-
-from funcy import compact
-
-from dvc.cli.command import CmdBase
-from dvc.cli.utils import append_doc_link
-from dvc.exceptions import InvalidArgumentError
-from dvc.ui import ui
-
-if TYPE_CHECKING:
-    from dvc.dependency import Dependency
-    from dvc.stage import PipelineStage
-
-
-logger = logging.getLogger(__name__)
-
-
-class CmdExperimentsInit(CmdBase):
-    DEFAULT_NAME = "train"
-    CODE = "src"
-    DATA = "data"
-    MODELS = "models"
-    DEFAULT_METRICS = "metrics.json"
-    DEFAULT_PARAMS = "params.yaml"
-    PLOTS = "plots"
-    DEFAULTS = {
-        "code": CODE,
-        "data": DATA,
-        "models": MODELS,
-        "metrics": DEFAULT_METRICS,
-        "params": DEFAULT_PARAMS,
-        "plots": PLOTS,
-    }
-
-    def run(self):
-        from dvc.commands.stage import parse_cmd
-
-        cmd = parse_cmd(self.args.command)
-        if not self.args.interactive and not cmd:
-            raise InvalidArgumentError("command is not specified")
-
-        from dvc.repo.experiments.init import init
-
-        defaults = {}
-        if not self.args.explicit:
-            config = self.repo.config["exp"]
-            defaults.update({**self.DEFAULTS, **config})
-
-        cli_args = compact(
-            {
-                "cmd": cmd,
-                "code": self.args.code,
-                "data": self.args.data,
-                "models": self.args.models,
-                "metrics": self.args.metrics,
-                "params": self.args.params,
-                "plots": self.args.plots,
-                "live": self.args.live,
-            }
-        )
-
-        initialized_stage, initialized_deps, initialized_out_dirs = init(
-            self.repo,
-            name=self.args.name,
-            type=self.args.type,
-            defaults=defaults,
-            overrides=cli_args,
-            interactive=self.args.interactive,
-            force=self.args.force,
-        )
-        self._post_init_display(
-            initialized_stage, initialized_deps, initialized_out_dirs
-        )
-        if self.args.run:
-            self.repo.experiments.run(targets=[initialized_stage.addressing])
-        return 0
-
-    def _post_init_display(
-        self,
-        stage: "PipelineStage",
-        new_deps: List["Dependency"],
-        new_out_dirs: List[str],
-    ) -> None:
-        from dvc.utils import humanize
-
-        path_fmt = "[green]{}[/green]".format
-        if new_deps:
-            deps_paths = humanize.join(map(path_fmt, new_deps))
-            ui.write(f"Creating dependencies: {deps_paths}", styled=True)
-
-        if new_out_dirs:
-            out_dirs_paths = humanize.join(map(path_fmt, new_out_dirs))
-            ui.write(f"Creating output directories: {out_dirs_paths}", styled=True)
-
-        ui.write(
-            f"Creating [b]{self.args.name}[/b] stage in [green]dvc.yaml[/]",
-            styled=True,
-        )
-        if stage.outs or not self.args.run:
-            # separate the above status-like messages with help/tips section
-            ui.write(styled=True)
-
-        if stage.outs:
-            outs_paths = humanize.join(map(path_fmt, stage.outs))
-            tips = f"Ensure your experiment command creates {outs_paths}."
-            ui.write(tips, styled=True)
-
-        if not self.args.run:
-            ui.write(
-                'You can now run your experiment using [b]"dvc exp run"[/].',
-                styled=True,
-            )
-        else:
-            # separate between `exp.run` output and `dvc exp init` output
-            ui.write(styled=True)
-
-
-def add_parser(experiments_subparsers, parent_parser):
-    EXPERIMENTS_INIT_HELP = "Quickly setup any project to use experiments."
-    experiments_init_parser = experiments_subparsers.add_parser(
-        "init",
-        parents=[parent_parser],
-        description=append_doc_link(EXPERIMENTS_INIT_HELP, "exp/init"),
-        formatter_class=argparse.RawDescriptionHelpFormatter,
-        help=EXPERIMENTS_INIT_HELP,
-    )
-    experiments_init_parser.add_argument(
-        "command",
-        nargs=argparse.REMAINDER,
-        help="Command to execute.",
-        metavar="command",
-    )
-    experiments_init_parser.add_argument(
-        "--run",
-        action="store_true",
-        help="Run the experiment after initializing it",
-    )
-    experiments_init_parser.add_argument(
-        "--interactive",
-        "-i",
-        action="store_true",
-        help="Prompt for values that are not provided",
-    )
-    experiments_init_parser.add_argument(
-        "-f",
-        "--force",
-        action="store_true",
-        default=False,
-        help="Overwrite existing stage",
-    )
-    experiments_init_parser.add_argument(
-        "--explicit",
-        action="store_true",
-        default=False,
-        help="Only use the path values explicitly provided",
-    )
-    experiments_init_parser.add_argument(
-        "--name",
-        "-n",
-        help="Name of the stage to create (default: %(default)s)",
-        default=CmdExperimentsInit.DEFAULT_NAME,
-    )
-    experiments_init_parser.add_argument(
-        "--code",
-        help=(
-            "Path to the source file or directory "
-            "which your experiments depend"
-            f" (default: {CmdExperimentsInit.CODE})"
-        ),
-    )
-    experiments_init_parser.add_argument(
-        "--data",
-        help=(
-            "Path to the data file or directory "
-            "which your experiments depend"
-            f" (default: {CmdExperimentsInit.DATA})"
-        ),
-    )
-    experiments_init_parser.add_argument(
-        "--models",
-        help=(
-            "Path to the model file or directory for your experiments"
-            f" (default: {CmdExperimentsInit.MODELS})"
-        ),
-    )
-    experiments_init_parser.add_argument(
-        "--params",
-        help=(
-            "Path to the parameters file for your experiments"
-            f" (default: {CmdExperimentsInit.DEFAULT_PARAMS})"
-        ),
-    )
-    experiments_init_parser.add_argument(
-        "--metrics",
-        help=(
-            "Path to the metrics file for your experiments"
-            f" (default: {CmdExperimentsInit.DEFAULT_METRICS})"
-        ),
-    )
-    experiments_init_parser.add_argument(
-        "--plots",
-        help=(
-            "Path to the plots file or directory for your experiments"
-            f" (default: {CmdExperimentsInit.PLOTS})"
-        ),
-    )
-    experiments_init_parser.add_argument(
-        "--live",
-        help="Path to log dvclive outputs for your experiments",
-    )
-    experiments_init_parser.add_argument(
-        "--type",
-        choices=["default", "checkpoint"],
-        default="default",
-        help="Select type of stage to create (default: %(default)s)",
-    )
-    experiments_init_parser.set_defaults(func=CmdExperimentsInit)

dvc/commands/experiments/ls.py

@@ -3,6 +3,7 @@ import logging
 
 from dvc.cli.command import CmdBase
 from dvc.cli.utils import append_doc_link
+from dvc.exceptions import InvalidArgumentError
 from dvc.ui import ui
 
 logger = logging.getLogger(__name__)
@@ -11,19 +12,36 @@ logger = logging.getLogger(__name__)
 class CmdExperimentsList(CmdBase):
     def run(self):
         name_only = self.args.name_only
+        sha_only = self.args.sha_only
+        git_remote = self.args.git_remote
+        if sha_only and git_remote:
+            raise InvalidArgumentError("--sha-only not supported with git_remote.")
         exps = self.repo.experiments.ls(
             all_commits=self.args.all_commits,
             rev=self.args.rev,
             num=self.args.num,
-            git_remote=self.args.git_remote,
+            git_remote=git_remote,
         )
 
         for baseline in exps:
-            if not name_only:
-                ui.write(f"{baseline}:")
-            for exp_name in exps[baseline]:
-                indent = "" if name_only else "\t"
-                ui.write(f"{indent}{exp_name}")
+            if not (name_only or sha_only):
+                tag_base = "refs/tags/"
+                branch_base = "refs/heads/"
+                name = baseline[:7]
+                if baseline.startswith(tag_base):
+                    name = baseline[len(tag_base) :]
+                elif baseline.startswith(branch_base):
+                    name = baseline[len(branch_base) :]
+                ui.write(f"{name}:")
+            for exp_name, rev in exps[baseline]:
+                if name_only:
+                    ui.write(exp_name)
+                elif sha_only:
+                    ui.write(rev)
+                elif rev:
+                    ui.write(f"\t{rev[:7]} [{exp_name}]")
+                else:
+                    ui.write(f"\t{exp_name}")
 
         return 0
 
@@ -40,11 +58,18 @@ def add_parser(experiments_subparsers, parent_parser):
         formatter_class=argparse.RawDescriptionHelpFormatter,
     )
     add_rev_selection_flags(experiments_list_parser, "List")
-    experiments_list_parser.add_argument(
+    display_group = experiments_list_parser.add_mutually_exclusive_group()
+    display_group.add_argument(
         "--name-only",
         "--names-only",
         action="store_true",
-        help="Only output experiment names (without parent commits).",
+        help="Only output experiment names (without SHAs or parent commits).",
+    )
+    display_group.add_argument(
+        "--sha-only",
+        "--shas-only",
+        action="store_true",
+        help="Only output experiment commit SHAs (without names or parent commits).",
     )
     experiments_list_parser.add_argument(
         "git_remote",

dvc/commands/experiments/pull.py

@@ -3,23 +3,13 @@ import logging
 
 from dvc.cli.command import CmdBase
 from dvc.cli.utils import append_doc_link
-from dvc.exceptions import InvalidArgumentError
 from dvc.ui import ui
 
 logger = logging.getLogger(__name__)
 
 
 class CmdExperimentsPull(CmdBase):
-    def raise_error_if_all_disabled(self):
-        if not any([self.args.experiment, self.args.all_commits, self.args.rev]):
-            raise InvalidArgumentError(
-                "Either provide an `experiment` argument, or use the "
-                "`--rev` or `--all-commits` flag."
-            )
-
     def run(self):
-        self.raise_error_if_all_disabled()
-
         pulled_exps = self.repo.experiments.pull(
             self.args.git_remote,
             self.args.experiment,
@@ -61,7 +51,7 @@ def add_parser(experiments_subparsers, parent_parser):
         help=EXPERIMENTS_PULL_HELP,
         formatter_class=argparse.RawDescriptionHelpFormatter,
     )
-    add_rev_selection_flags(experiments_pull_parser, "Pull", False)
+    add_rev_selection_flags(experiments_pull_parser, "Pull", True)
     experiments_pull_parser.add_argument(
         "-f",
         "--force",

dvc/commands/experiments/push.py

@@ -5,20 +5,12 @@ from typing import Any, Dict
 from dvc.cli import completion
 from dvc.cli.command import CmdBase
 from dvc.cli.utils import append_doc_link
-from dvc.exceptions import InvalidArgumentError
 from dvc.ui import ui
 
 logger = logging.getLogger(__name__)
 
 
 class CmdExperimentsPush(CmdBase):
-    def raise_error_if_all_disabled(self):
-        if not any([self.args.experiment, self.args.all_commits, self.args.rev]):
-            raise InvalidArgumentError(
-                "Either provide an `experiment` argument, or use the "
-                "`--rev` or `--all-commits` flag."
-            )
-
     @staticmethod
     def log_result(result: Dict[str, Any], remote: str):
         from dvc.utils import humanize
@@ -52,13 +44,13 @@ class CmdExperimentsPush(CmdBase):
             ui.write(humanize.get_summary(stats.items()))
 
         if project_url := result.get("url"):
-            ui.write("[yellow]View your experiments at", project_url, styled=True)
+            ui.rich_print(
+                "View your experiments at", project_url, style="yellow", soft_wrap=True
+            )
 
     def run(self):
         from dvc.repo.experiments.push import UploadError
 
-        self.raise_error_if_all_disabled()
-
         try:
             result = self.repo.experiments.push(
                 self.args.git_remote,
@@ -100,7 +92,7 @@ def add_parser(experiments_subparsers, parent_parser):
         help=EXPERIMENTS_PUSH_HELP,
         formatter_class=argparse.RawDescriptionHelpFormatter,
     )
-    add_rev_selection_flags(experiments_push_parser, "Push", False)
+    add_rev_selection_flags(experiments_push_parser, "Push", True)
     experiments_push_parser.add_argument(
         "-f",
         "--force",

dvc/commands/experiments/run.py

@@ -1,50 +1,28 @@
 import argparse
 import logging
 
-from dvc.cli import completion
 from dvc.cli.utils import append_doc_link
 from dvc.commands.repro import CmdRepro
 from dvc.commands.repro import add_arguments as add_repro_arguments
-from dvc.exceptions import InvalidArgumentError
-from dvc.ui import ui
 
 logger = logging.getLogger(__name__)
 
 
 class CmdExperimentsRun(CmdRepro):
     def run(self):
-        from dvc.compare import show_metrics
-
-        if self.args.checkpoint_resume:
-            if self.args.reset:
-                raise InvalidArgumentError("--reset and --rev are mutually exclusive.")
-            if not (self.args.queue or self.args.tmp_dir):
-                raise InvalidArgumentError(
-                    "--rev can only be used in conjunction with --queue or --temp."
-                )
-
-        if self.args.reset:
-            ui.write("Any existing checkpoints will be reset and re-run.")
-
-        results = self.repo.experiments.run(
+        self.repo.experiments.run(
             name=self.args.name,
             queue=self.args.queue,
             run_all=self.args.run_all,
             jobs=self.args.jobs,
             params=self.args.set_param,
-            checkpoint_resume=self.args.checkpoint_resume,
-            reset=self.args.reset,
             tmp_dir=self.args.tmp_dir,
             machine=self.args.machine,
             copy_paths=self.args.copy_paths,
+            message=self.args.message,
             **self._common_kwargs,
         )
 
-        if self.args.metrics and results:
-            metrics = self.repo.metrics.show(revs=list(results))
-            metrics.pop("workspace", None)
-            show_metrics(metrics)
-
         return 0
 
 
@@ -58,22 +36,6 @@ def add_parser(experiments_subparsers, parent_parser):
         formatter_class=argparse.RawDescriptionHelpFormatter,
     )
     _add_run_common(experiments_run_parser)
-    experiments_run_parser.add_argument(
-        "-r",
-        "--rev",
-        type=str,
-        dest="checkpoint_resume",
-        help=(
-            "Continue the specified checkpoint experiment. Can only be used "
-            "in conjunction with --queue or --temp."
-        ),
-        metavar="<experiment_rev>",
-    ).complete = completion.EXPERIMENT
-    experiments_run_parser.add_argument(
-        "--reset",
-        action="store_true",
-        help="Reset existing checkpoints and restart the experiment.",
-    )
     experiments_run_parser.set_defaults(func=CmdExperimentsRun)
 
 
@@ -147,3 +109,10 @@ def _add_run_common(parser):
             " Only used if `--temp` or `--queue` is specified."
         ),
     )
+    parser.add_argument(
+        "-m",
+        "--message",
+        type=str,
+        default=None,
+        help="Custom commit message to use when committing the experiment.",
+    )

dvc/commands/experiments/save.py

@@ -16,6 +16,7 @@ class CmdExperimentsSave(CmdBase):
                 name=self.args.name,
                 force=self.args.force,
                 include_untracked=self.args.include_untracked,
+                message=self.args.message,
             )
         except DvcException:
             logger.exception("failed to save experiment")
@@ -52,7 +53,6 @@ def add_parser(experiments_subparsers, parent_parser):
     )
     save_parser.add_argument(
         "--json",
-        "--show-json",
         action="store_true",
         default=False,
         help="Show output in JSON format.",
@@ -75,4 +75,11 @@ def add_parser(experiments_subparsers, parent_parser):
         help="List of untracked paths to include in the experiment.",
         metavar="<path>",
     )
+    save_parser.add_argument(
+        "-M",
+        "--message",
+        type=str,
+        default=None,
+        help="Custom commit message to use when committing the experiment.",
+    )
     save_parser.set_defaults(func=CmdExperimentsSave)

dvc/commands/experiments/show.py

@@ -1,20 +1,16 @@
 import argparse
 import logging
-import os
 import re
-from collections import Counter, OrderedDict, defaultdict
 from datetime import date, datetime
-from typing import TYPE_CHECKING, Any, Dict, Set
+from typing import TYPE_CHECKING, Dict, Iterable
 
 from funcy import lmap
 
-from dvc.cli import completion
 from dvc.cli.command import CmdBase
 from dvc.cli.utils import append_doc_link
 from dvc.commands.metrics import DEFAULT_PRECISION
-from dvc.exceptions import DvcException, InvalidArgumentError
+from dvc.exceptions import DvcException
 from dvc.ui import ui
-from dvc.utils.flatten import flatten
 from dvc.utils.serialize import encode_exception
 
 if TYPE_CHECKING:
@@ -28,263 +24,13 @@ FILL_VALUE_ERRORED = "!"
 logger = logging.getLogger(__name__)
 
 
-def _update_names(names, items):
-    for name, item in items:
-        item = item.get("data", {})
-        if isinstance(item, dict):
-            item = flatten(item)
-            names[name].update({key: None for key in item})
-
-
-def _collect_names(all_experiments, **kwargs):
-    metric_names: Dict[str, Dict[str, Any]] = defaultdict(dict)
-    param_names: Dict[str, Dict[str, Any]] = defaultdict(dict)
-    deps_names: Set[str] = set()
-
-    for _, experiments in all_experiments.items():
-        for exp_data in experiments.values():
-            exp = exp_data.get("data", {})
-            _update_names(metric_names, exp.get("metrics", {}).items())
-            _update_names(param_names, exp.get("params", {}).items())
-            for dep_name in exp.get("deps", {}):
-                deps_names.add(dep_name)
-
-    return metric_names, param_names, sorted(deps_names)
-
-
 experiment_types = {
-    "checkpoint_tip": "│ ╓",
-    "checkpoint_commit": "│ ╟",
-    "checkpoint_base": "├─╨",
     "branch_commit": "├──",
     "branch_base": "└──",
     "baseline": "",
 }
 
 
-def _collect_rows(  # noqa: C901, PLR0912, PLR0913, PLR0915
-    base_rev,
-    experiments,
-    all_headers,
-    metric_headers,
-    param_headers,
-    metric_names,
-    param_names,
-    deps_names,
-    precision=DEFAULT_PRECISION,
-    sort_by=None,
-    sort_order=None,
-    fill_value=FILL_VALUE,
-    iso=False,
-):
-    from dvc.scm import Git
-
-    if sort_by:
-        sort_path, sort_name, sort_type = _sort_column(
-            sort_by, metric_names, param_names
-        )
-        reverse = sort_order == "desc"
-        experiments = _sort_exp(experiments, sort_path, sort_name, sort_type, reverse)
-
-    new_checkpoint = True
-    for i, (rev, results) in enumerate(experiments.items()):
-        fill_value = FILL_VALUE_ERRORED if results.get("error") else fill_value
-        row_dict = {k: fill_value for k in all_headers}
-
-        exp = results.get("data", {})
-
-        state = exp.get("status")
-        if state == "Success":
-            state = fill_value
-
-        is_baseline = rev == "baseline"
-
-        if is_baseline:
-            name_rev = base_rev[:7] if Git.is_sha(base_rev) else base_rev
-        else:
-            name_rev = rev[:7]
-
-        tip = exp.get("checkpoint_tip")
-        parent_rev = exp.get("checkpoint_parent", "")
-        parent_exp = experiments.get(parent_rev, {}).get("data", {})
-        parent_tip = parent_exp.get("checkpoint_tip")
-
-        parent = ""
-        if is_baseline:
-            typ = "baseline"
-        elif tip:
-            if tip == parent_tip:
-                typ = "checkpoint_tip" if new_checkpoint else "checkpoint_commit"
-            elif parent_rev == base_rev:
-                typ = "checkpoint_base"
-            else:
-                typ = "checkpoint_commit"
-                parent = parent_rev[:7]
-        elif i < len(experiments) - 1:
-            typ = "branch_commit"
-        else:
-            typ = "branch_base"
-
-        if not is_baseline:
-            new_checkpoint = not (tip and tip == parent_tip)
-
-        row_dict["Experiment"] = exp.get("name", "")
-        row_dict["rev"] = name_rev
-        row_dict["typ"] = typ
-        row_dict["Created"] = format_time(exp.get("timestamp"), fill_value, iso)
-        row_dict["parent"] = parent
-        row_dict["State"] = state
-        row_dict["Executor"] = exp.get("executor", fill_value)
-
-        _extend_row(
-            row_dict,
-            metric_names,
-            metric_headers,
-            exp.get("metrics", {}).items(),
-            precision,
-            fill_value=fill_value,
-        )
-        _extend_row(
-            row_dict,
-            param_names,
-            param_headers,
-            exp.get("params", {}).items(),
-            precision,
-            fill_value=fill_value,
-        )
-        for dep in deps_names:
-            hash_info = exp.get("deps", {}).get(dep, {}).get("hash")
-            if hash_info is not None:
-                hash_info = hash_info[:7]
-            row_dict[dep] = hash_info
-        yield list(row_dict.values())
-
-
-def _sort_column(sort_by, metric_names, param_names):
-    path, _, sort_name = sort_by.rpartition(":")
-    matches = set()
-
-    if path:
-        if path in metric_names and sort_name in metric_names[path]:
-            matches.add((path, sort_name, "metrics"))
-        if path in param_names and sort_name in param_names[path]:
-            matches.add((path, sort_name, "params"))
-    else:
-        for path in metric_names:
-            if sort_name in metric_names[path]:
-                matches.add((path, sort_name, "metrics"))
-        for path in param_names:
-            if sort_name in param_names[path]:
-                matches.add((path, sort_name, "params"))
-
-    if len(matches) == 1:
-        return matches.pop()
-    if len(matches) > 1:
-        raise InvalidArgumentError(
-            "Ambiguous sort column '{}' matched '{}'".format(
-                sort_by,
-                ", ".join([f"{path}:{name}" for path, name, _ in matches]),
-            )
-        )
-    raise InvalidArgumentError(f"Unknown sort column '{sort_by}'")
-
-
-def _sort_exp(experiments, sort_path, sort_name, typ, reverse):
-    def _sort(item):
-        rev, exp = item
-        exp_data = exp.get("data", {})
-        tip = exp_data.get("checkpoint_tip")
-        if tip and tip != rev:
-            # Sort checkpoint experiments by tip commit
-            return _sort((tip, experiments[tip]))
-        data = exp_data.get(typ, {}).get(sort_path, {}).get("data", {})
-        val = flatten(data).get(sort_name)
-        return val is None, val
-
-    ret = OrderedDict()
-    if "baseline" in experiments:
-        ret["baseline"] = experiments.pop("baseline")
-
-    ret.update(sorted(experiments.items(), key=_sort, reverse=reverse))
-    return ret
-
-
-def format_time(datetime_obj, fill_value=FILL_VALUE, iso=False):
-    if datetime_obj is None:
-        return fill_value
-
-    if iso:
-        return datetime_obj.isoformat()
-
-    if datetime_obj.date() == date.today():
-        fmt = "%I:%M %p"
-    else:
-        fmt = "%b %d, %Y"
-    return datetime_obj.strftime(fmt)
-
-
-def _extend_row(row, names, headers, items, precision, fill_value=FILL_VALUE):
-    from dvc.compare import _format_field, with_value
-
-    for fname, data in items:
-        item = data.get("data", {})
-        item = flatten(item) if isinstance(item, dict) else {fname: item}
-        for name in names[fname]:
-            value = with_value(
-                item.get(name),
-                FILL_VALUE_ERRORED if data.get("error", None) else fill_value,
-            )
-            # wrap field data in ui.rich_text, otherwise rich may
-            # interpret unescaped braces from list/dict types as rich
-            # markup tags
-            value = ui.rich_text(str(_format_field(value, precision)))
-            if name in headers:
-                row[name] = value
-            else:
-                row[f"{fname}:{name}"] = value
-
-
-def experiments_table(  # noqa: PLR0913
-    all_experiments,
-    headers,
-    metric_headers,
-    metric_names,
-    param_headers,
-    param_names,
-    deps_names,
-    sort_by=None,
-    sort_order=None,
-    precision=DEFAULT_PRECISION,
-    fill_value=FILL_VALUE,
-    iso=False,
-) -> "TabularData":
-    from funcy import lconcat
-
-    from dvc.compare import TabularData
-
-    all_headers = lconcat(headers, metric_headers, param_headers, deps_names)
-    td = TabularData(all_headers, fill_value=fill_value)
-    for base_rev, experiments in all_experiments.items():
-        rows = _collect_rows(
-            base_rev,
-            experiments,
-            all_headers,
-            metric_headers,
-            param_headers,
-            metric_names,
-            param_names,
-            deps_names,
-            sort_by=sort_by,
-            sort_order=sort_order,
-            precision=precision,
-            fill_value=fill_value,
-            iso=iso,
-        )
-        td.extend(rows)
-
-    return td
-
-
 def prepare_exp_id(kwargs) -> "RichText":
     exp_name = kwargs["Experiment"]
     rev = kwargs["rev"]
@@ -308,50 +54,16 @@ def baseline_styler(typ):
     return {"style": "bold"} if typ == "baseline" else {}
 
 
-def show_experiments(  # noqa: C901, PLR0912
-    all_experiments,
+def show_experiments(  # noqa: C901
+    td: "TabularData",
+    headers: Dict[str, Iterable[str]],
     keep=None,
     drop=None,
     pager=True,
     csv=False,
     markdown=False,
-    pcp=False,
     **kwargs,
 ):
-    from funcy.seqs import flatten as flatten_list
-
-    metric_names, param_names, deps_names = _collect_names(all_experiments)
-
-    headers_list = [
-        "Experiment",
-        "rev",
-        "typ",
-        "Created",
-        "parent",
-        "State",
-        "Executor",
-    ]
-
-    names = {**metric_names, **param_names}
-    counter = Counter(flatten_list([list(a.keys()) for a in names.values()]))
-    counter.update(headers_list)
-    metric_headers = _normalize_headers(metric_names, counter)
-    param_headers = _normalize_headers(param_names, counter)
-
-    td = experiments_table(
-        all_experiments,
-        headers_list,
-        metric_headers,
-        metric_names,
-        param_headers,
-        param_names,
-        deps_names,
-        kwargs.get("sort_by"),
-        kwargs.get("sort_order"),
-        kwargs.get("precision"),
-        kwargs.get("fill_value"),
-        kwargs.get("iso"),
-    )
     if keep:
         for col in td.keys():  # noqa: SIM118
             if re.match(keep, col):
@@ -368,11 +80,6 @@ def show_experiments(  # noqa: C901, PLR0912
         td.column("Experiment")[:] = map(prepare_exp_id, td.as_dict(merge_headers))
         td.drop(*merge_headers[1:])
 
-    headers = {
-        "metrics": metric_headers,
-        "params": param_headers,
-        "deps": deps_names,
-    }
     styles = {
         "Experiment": {"no_wrap": True, "header_style": "black on grey93"},
         "Created": {"header_style": "black on grey93"},
@@ -397,51 +104,23 @@ def show_experiments(  # noqa: C901, PLR0912
         }
     )
 
-    if kwargs.get("only_changed", False) or pcp:
+    if kwargs.get("only_changed", False):
         td.drop_duplicates("cols", ignore_empty=False)
 
     cols_to_drop = set()
     if drop is not None:
         cols_to_drop = {col for col in td.keys() if re.match(drop, col)}  # noqa: SIM118
-    if pcp:
-        cols_to_drop.add("Created")
     td.drop(*cols_to_drop)
 
-    if pcp:
-        subset = {x for x in td.keys() if x != "Experiment"}  # noqa: SIM118
-        td.dropna(
-            "rows",
-            how="all",
-            subset=subset,
-        )
-        td.drop_duplicates("rows", subset=subset)
-        if "Experiment" in td:
-            td.column("Experiment")[:] = [
-                # remove tree characters
-                str(x).encode("ascii", "ignore").strip().decode()
-                for x in td.column("Experiment")
-            ]
-        out = kwargs.get("out") or "dvc_plots"
-        output_file = os.path.join(out, "index.html")
-        ui.write(
-            td.to_parallel_coordinates(
-                output_path=os.path.abspath(output_file),
-                color_by=kwargs.get("sort_by") or "Experiment",
-            )
-        )
-        if kwargs.get("open"):
-            return ui.open_browser(output_file)
-
-    else:
-        td.render(
-            pager=pager,
-            borders="horizontals",
-            rich_table=True,
-            header_styles=styles,
-            row_styles=row_styles,
-            csv=csv,
-            markdown=markdown,
-        )
+    td.render(
+        pager=pager,
+        borders="horizontals",
+        rich_table=True,
+        header_styles=styles,
+        row_styles=row_styles,
+        csv=csv,
+        markdown=markdown,
+    )
 
 
 def _normalize_headers(names, count):
@@ -453,19 +132,17 @@ def _normalize_headers(names, count):
 
 
 def _format_json(item):
-    from dvc.repo.experiments.show import _CachedError
-
     if isinstance(item, (date, datetime)):
         return item.isoformat()
-    if isinstance(item, _CachedError):
-        return {"type": getattr(item, "typ", "_CachedError"), "msg": str(item)}
     return encode_exception(item)
 
 
 class CmdExperimentsShow(CmdBase):
     def run(self):
+        from dvc.repo.experiments.show import tabulate
+
         try:
-            all_experiments = self.repo.experiments.show(
+            exps = self.repo.experiments.show(
                 all_branches=self.args.all_branches,
                 all_tags=self.args.all_tags,
                 all_commits=self.args.all_commits,
@@ -483,30 +160,33 @@ class CmdExperimentsShow(CmdBase):
             return 1
 
         if self.args.json:
-            ui.write_json(all_experiments, default=_format_json)
+            ui.write_json([exp.dumpd() for exp in exps], default=_format_json)
         else:
             precision = (
                 self.args.precision or None if self.args.csv else DEFAULT_PRECISION
             )
             fill_value = "" if self.args.csv else FILL_VALUE
             iso = self.args.csv
+            td, headers = tabulate(
+                exps,
+                precision=precision,
+                fill_value=fill_value,
+                iso=iso,
+                sort_by=self.args.sort_by,
+                sort_order=self.args.sort_order,
+            )
 
             show_experiments(
-                all_experiments,
+                td,
+                headers,
                 keep=self.args.keep,
                 drop=self.args.drop,
                 sort_by=self.args.sort_by,
                 sort_order=self.args.sort_order,
-                precision=precision,
-                fill_value=fill_value,
-                iso=iso,
                 pager=not self.args.no_pager,
                 csv=self.args.csv,
                 markdown=self.args.markdown,
                 only_changed=self.args.only_changed,
-                pcp=self.args.pcp,
-                out=self.args.out,
-                open=self.args.open,
             )
         return 0
 
@@ -599,21 +279,18 @@ def add_parser(experiments_subparsers, parent_parser):
     )
     experiments_show_parser.add_argument(
         "--json",
-        "--show-json",
         action="store_true",
         default=False,
         help="Print output in JSON format instead of a human-readable table.",
     )
     experiments_show_parser.add_argument(
         "--csv",
-        "--show-csv",
         action="store_true",
         default=False,
         help="Print output in csv format instead of a human-readable table.",
     )
     experiments_show_parser.add_argument(
         "--md",
-        "--show-md",
         action="store_true",
         default=False,
         dest="markdown",
@@ -628,27 +305,6 @@ def add_parser(experiments_subparsers, parent_parser):
         ),
         metavar="<n>",
     )
-    experiments_show_parser.add_argument(
-        "--parallel-coordinates-plot",
-        "--pcp",
-        dest="pcp",
-        action="store_true",
-        default=False,
-        help="Generate a Parallel Coordinates Plot from the tabulated output.",
-    )
-    experiments_show_parser.add_argument(
-        "-o",
-        "--out",
-        default=None,
-        help="Destination folder to save the Parallel Coordinates Plot to",
-        metavar="<path>",
-    ).complete = completion.DIR
-    experiments_show_parser.add_argument(
-        "--open",
-        action="store_true",
-        default=False,
-        help="Open the Parallel Coordinates Plot directly in the browser.",
-    )
     experiments_show_parser.add_argument(
         "--no-fetch",
         dest="fetch_running",

dvc/commands/gc.py

@@ -10,7 +10,7 @@ logger = logging.getLogger(__name__)
 
 
 class CmdGC(CmdBase):
-    def run(self):  # noqa: C901
+    def run(self):  # noqa: C901, PLR0912
         from dvc.repo.gc import _validate_args
 
         _validate_args(
@@ -22,6 +22,8 @@ class CmdGC(CmdBase):
             workspace=self.args.workspace,
             rev=self.args.rev,
             num=self.args.num,
+            cloud=self.args.cloud,
+            not_in_remote=self.args.not_in_remote,
         )
 
         if self.args.rev:
@@ -46,6 +48,10 @@ class CmdGC(CmdBase):
 
         if self.args.all_experiments:
             msg += " and all experiments"
+
+        if self.args.not_in_remote:
+            msg += " that are present in the DVC remote"
+
         if self.args.repos:
             msg += " of the current and the following repos:"
 
@@ -74,6 +80,7 @@ class CmdGC(CmdBase):
             workspace=self.args.workspace,
             rev=self.args.rev,
             num=self.args.num,
+            not_in_remote=self.args.not_in_remote,
         )
         return 0
 
@@ -157,12 +164,18 @@ def add_parser(subparsers, parent_parser):
         default=False,
         help="Keep data files for all experiments.",
     )
+    gc_parser.add_argument(
+        "--not-in-remote",
+        action="store_true",
+        default=False,
+        help="Keep data files that are not present in the remote.",
+    )
     gc_parser.add_argument(
         "-c",
         "--cloud",
         action="store_true",
         default=False,
-        help="Collect garbage in remote repository.",
+        help="Collect garbage in remote storage in addition to local cache.",
     )
     gc_parser.add_argument(
         "-r",

dvc/commands/get.py

@@ -36,6 +36,7 @@ class CmdGet(CmdBaseNoRepo):
                 out=self.args.out,
                 rev=self.args.rev,
                 jobs=self.args.jobs,
+                force=self.args.force,
             )
             return 0
         except CloneError:
@@ -94,4 +95,11 @@ def add_parser(subparsers, parent_parser):
         ),
         metavar="<number>",
     )
+    get_parser.add_argument(
+        "-f",
+        "--force",
+        action="store_true",
+        default=False,
+        help="Override local file or folder if exists.",
+    )
     get_parser.set_defaults(func=CmdGet)

dvc/commands/get_url.py

@@ -14,7 +14,12 @@ class CmdGetUrl(CmdBaseNoRepo):
         from dvc.repo import Repo
 
         try:
-            Repo.get_url(self.args.url, out=self.args.out, jobs=self.args.jobs)
+            Repo.get_url(
+                self.args.url,
+                out=self.args.out,
+                jobs=self.args.jobs,
+                force=self.args.force,
+            )
             return 0
         except DvcException:
             logger.exception("failed to get '%s'", self.args.url)
@@ -46,4 +51,11 @@ def add_parser(subparsers, parent_parser):
         ),
         metavar="<number>",
     )
+    get_parser.add_argument(
+        "-f",
+        "--force",
+        action="store_true",
+        default=False,
+        help="Override local file or folder if exists.",
+    )
     get_parser.set_defaults(func=CmdGetUrl)

dvc/commands/imp.py

@@ -18,14 +18,9 @@ class CmdImport(CmdBase):
                 self.args.url,
                 self.args.path,
                 out=self.args.out,
-                fname=self.args.file,
                 rev=self.args.rev,
                 no_exec=self.args.no_exec,
                 no_download=self.args.no_download,
-                desc=self.args.desc,
-                type=self.args.type,
-                labels=self.args.labels,
-                meta=self.args.meta,
                 jobs=self.args.jobs,
             )
         except CloneError:
@@ -42,8 +37,6 @@ class CmdImport(CmdBase):
 
 
 def add_parser(subparsers, parent_parser):
-    from .add import _add_annotating_args
-
     IMPORT_HELP = (
         "Download file or directory tracked by DVC or by Git "
         "into the workspace, and track it."
@@ -75,11 +68,6 @@ def add_parser(subparsers, parent_parser):
         help="Git revision (e.g. SHA, branch, tag)",
         metavar="<commit>",
     )
-    import_parser.add_argument(
-        "--file",
-        help="Specify name of the .dvc file this command will generate.",
-        metavar="<filename>",
-    )
     no_download_exec_group = import_parser.add_mutually_exclusive_group()
     no_download_exec_group.add_argument(
         "--no-exec",
@@ -106,6 +94,4 @@ def add_parser(subparsers, parent_parser):
         ),
         metavar="<number>",
     )
-
-    _add_annotating_args(import_parser)
     import_parser.set_defaults(func=CmdImport)

dvc/commands/imp_url.py

@@ -15,16 +15,12 @@ class CmdImportUrl(CmdBase):
             self.repo.imp_url(
                 self.args.url,
                 out=self.args.out,
-                fname=self.args.file,
                 no_exec=self.args.no_exec,
                 no_download=self.args.no_download,
                 remote=self.args.remote,
                 to_remote=self.args.to_remote,
-                desc=self.args.desc,
-                type=self.args.type,
-                labels=self.args.labels,
-                meta=self.args.meta,
                 jobs=self.args.jobs,
+                force=self.args.force,
                 version_aware=self.args.version_aware,
             )
         except DvcException:
@@ -40,8 +36,6 @@ class CmdImportUrl(CmdBase):
 
 
 def add_parser(subparsers, parent_parser):
-    from .add import _add_annotating_args
-
     IMPORT_HELP = "Download or copy file from URL and take it under DVC control."
 
     import_parser = subparsers.add_parser(
@@ -69,11 +63,6 @@ def add_parser(subparsers, parent_parser):
     import_parser.add_argument(
         "out", nargs="?", help="Destination path to put files to."
     ).complete = completion.DIR
-    import_parser.add_argument(
-        "--file",
-        help="Specify name of the .dvc file this command will generate.",
-        metavar="<filename>",
-    ).complete = completion.DIR
     import_parser.add_argument(
         "--to-remote",
         action="store_true",
@@ -112,11 +101,17 @@ def add_parser(subparsers, parent_parser):
         ),
         metavar="<number>",
     )
+    import_parser.add_argument(
+        "-f",
+        "--force",
+        action="store_true",
+        default=False,
+        help="Override local file or folder if exists.",
+    )
     import_parser.add_argument(
         "--version-aware",
         action="store_true",
         default=False,
         help="Import using cloud versioning. Implied if the URL contains a version ID.",
     )
-    _add_annotating_args(import_parser)
     import_parser.set_defaults(func=CmdImportUrl)

dvc/commands/ls/__init__.py

@@ -71,7 +71,6 @@ def add_parser(subparsers, parent_parser):
     )
     list_parser.add_argument(
         "--json",
-        "--show-json",
         action="store_true",
         help="Show output in JSON format.",
     )

dvc/commands/metrics.py

@@ -140,14 +140,12 @@ def add_parser(subparsers, parent_parser):
     )
     metrics_show_parser.add_argument(
         "--json",
-        "--show-json",
         action="store_true",
         default=False,
         help="Show output in JSON format.",
     )
     metrics_show_parser.add_argument(
         "--md",
-        "--show-md",
         action="store_true",
         default=False,
         dest="markdown",
@@ -223,14 +221,12 @@ def add_parser(subparsers, parent_parser):
     )
     metrics_diff_parser.add_argument(
         "--json",
-        "--show-json",
         action="store_true",
         default=False,
         help="Show output in JSON format.",
     )
     metrics_diff_parser.add_argument(
         "--md",
-        "--show-md",
         action="store_true",
         default=False,
         dest="markdown",

dvc/commands/params.py

@@ -105,14 +105,12 @@ def add_parser(subparsers, parent_parser):
     )
     params_diff_parser.add_argument(
         "--json",
-        "--show-json",
         action="store_true",
         default=False,
         help="Show output in JSON format.",
     )
     params_diff_parser.add_argument(
         "--md",
-        "--show-md",
         action="store_true",
         default=False,
         dest="markdown",

dvc/commands/plots.py

@@ -430,7 +430,6 @@ def _add_ui_arguments(parser):
     )
     parser.add_argument(
         "--json",
-        "--show-json",
         action="store_true",
         default=False,
         help=argparse.SUPPRESS,

dvc/commands/queue/status.py

@@ -1,10 +1,8 @@
 import argparse
 import logging
-from typing import Dict, List, Optional
 
 from dvc.cli.command import CmdBase
 from dvc.cli.utils import append_doc_link
-from dvc.commands.experiments.show import format_time
 from dvc.compare import TabularData
 from dvc.ui import ui
 
@@ -15,9 +13,9 @@ class CmdQueueStatus(CmdBase):
     """Show queue task and worker status."""
 
     def run(self) -> int:
-        result: List[
-            Dict[str, Optional[str]]
-        ] = self.repo.experiments.celery_queue.status()
+        from dvc.repo.experiments.show import format_time
+
+        result = self.repo.experiments.celery_queue.status()
         if result:
             all_headers = ["Task", "Name", "Created", "Status"]
             td = TabularData(all_headers)

dvc/commands/repro.py

@@ -16,12 +16,6 @@ class CmdRepro(CmdBase):
         else:
             ui.write("Use `dvc push` to send your updates to remote storage.")
 
-        if self.args.metrics:
-            from dvc.compare import show_metrics
-
-            metrics = self.repo.metrics.show()
-            show_metrics(metrics)
-
         return 0
 
     @property
@@ -38,6 +32,7 @@ class CmdRepro(CmdBase):
             "recursive": self.args.recursive,
             "force_downstream": self.args.force_downstream,
             "pull": self.args.pull,
+            "allow_missing": self.args.allow_missing,
         }
 
     @property
@@ -104,13 +99,6 @@ and then the stage name name.
         default=False,
         help="Reproduce all stages in the specified directory.",
     )
-    repro_parser.add_argument(
-        "-m",
-        "--metrics",
-        action="store_true",
-        default=False,
-        help="Show metrics after reproduction.",
-    )
     repro_parser.add_argument(
         "--downstream",
         action="store_true",
@@ -135,6 +123,12 @@ and then the stage name name.
             "from the run-cache."
         ),
     )
+    repro_parser.add_argument(
+        "--allow-missing",
+        action="store_true",
+        default=False,
+        help=("Skip stages with missing data but no other changes."),
+    )
     repro_parser.add_argument(
         "--dry",
         action="store_true",

dvc/commands/run.py

@@ -1,96 +0,0 @@
-import argparse
-import logging
-
-from dvc.cli.command import CmdBase
-from dvc.cli.utils import append_doc_link
-from dvc.commands.stage import parse_cmd
-from dvc.exceptions import DvcException
-
-logger = logging.getLogger(__name__)
-
-
-class CmdRun(CmdBase):
-    def run(self):
-        if not any(
-            [
-                self.args.deps,
-                self.args.outs,
-                self.args.outs_no_cache,
-                self.args.metrics,
-                self.args.metrics_no_cache,
-                self.args.plots,
-                self.args.plots_no_cache,
-                self.args.outs_persist,
-                self.args.outs_persist_no_cache,
-                self.args.checkpoints,
-                self.args.params,
-                self.args.command,
-            ]
-        ):  # pragma: no cover
-            logger.error(
-                "too few arguments. Specify at least one: `-d`, `-o`, `-O`, "
-                "`-m`, `-M`, `-p`, `--plots`, `--plots-no-cache`, "
-                "`--outs-persist`, `--outs-persist-no-cache`, `command`."
-            )
-            return 1
-
-        kwargs = vars(self.args)
-        kwargs.update(
-            {
-                "cmd": parse_cmd(self.args.command),
-                "fname": kwargs.pop("file"),
-                "no_exec": self.args.no_exec or bool(self.args.checkpoints),
-                "run_cache": not kwargs.pop("no_run_cache"),
-            }
-        )
-        try:
-            self.repo.run(**kwargs)
-        except DvcException:
-            logger.exception("")
-            return 1
-
-        return 0
-
-
-def add_parser(subparsers, parent_parser):
-    from dvc.commands.stage import _add_common_args
-
-    RUN_HELP = "Generate a dvc.yaml file from a command and execute the command."
-    run_parser = subparsers.add_parser(
-        "run",
-        parents=[parent_parser],
-        description=append_doc_link(RUN_HELP, "run"),
-        help=RUN_HELP,
-        formatter_class=argparse.RawDescriptionHelpFormatter,
-    )
-    run_parser.add_argument("-n", "--name", help="Stage name.")
-    run_parser.add_argument("--file", metavar="<filename>", help=argparse.SUPPRESS)
-    run_parser.add_argument(
-        "--single-stage",
-        action="store_true",
-        default=False,
-        help=argparse.SUPPRESS,
-    )
-    _add_common_args(run_parser)
-    run_parser.add_argument(
-        "--no-exec",
-        action="store_true",
-        default=False,
-        help="Only create dvc.yaml without actually running it.",
-    )
-    run_parser.add_argument(
-        "--no-commit",
-        action="store_true",
-        default=False,
-        help="Don't put files/directories into cache.",
-    )
-    run_parser.add_argument(
-        "--no-run-cache",
-        action="store_true",
-        default=False,
-        help=(
-            "Execute the command even if this stage has already been run "
-            "with the same command/dependencies/outputs/etc before."
-        ),
-    )
-    run_parser.set_defaults(func=CmdRun)

dvc/commands/stage.py

@@ -1,5 +1,6 @@
 import argparse
 import logging
+from contextlib import contextmanager
 from itertools import chain, filterfalse
 from typing import TYPE_CHECKING, Dict, Iterable, List
 
@@ -119,8 +120,22 @@ def parse_cmd(commands: List[str]) -> str:
     return " ".join(map(quote_argument, commands))
 
 
+@contextmanager
+def _disable_logging(highest_level=logging.CRITICAL):
+    previous_level = logging.root.manager.disable
+
+    logging.disable(highest_level)
+
+    try:
+        yield
+    finally:
+        logging.disable(previous_level)
+
+
 class CmdStageAdd(CmdBase):
     def run(self):
+        from dvc.repo import lock_repo
+
         kwargs = vars(self.args)
         kwargs.update(
             {
@@ -128,7 +143,15 @@ class CmdStageAdd(CmdBase):
                 "params": parse_params(self.args.params),
             }
         )
-        self.repo.stage.add(**kwargs)
+
+        with self.repo.scm_context, lock_repo(self.repo):
+            with _disable_logging(logging.INFO):
+                stage = self.repo.stage.add(**kwargs)
+            logger.info("Added stage %r in %r", stage.addressing, stage.relpath)
+            if self.args.run:
+                stage.run()
+                stage.dump(update_pipeline=False)
+
         return 0
 
 
@@ -172,17 +195,6 @@ def _add_common_args(parser):
         help="Declare output file or directory (do not put into DVC cache).",
         metavar="<filename>",
     ).complete = completion.FILE
-    parser.add_argument(
-        "-c",
-        "--checkpoints",
-        action="append",
-        default=[],
-        help=(
-            "Declare checkpoint output file or directory for 'dvc exp run'. "
-            "Not compatible with 'dvc repro'."
-        ),
-        metavar="<filename>",
-    ).complete = completion.FILE
     parser.add_argument(
         "--external",
         action="store_true",
@@ -257,6 +269,12 @@ def _add_common_args(parser):
             "This doesn't affect any DVC operations."
         ),
     )
+    parser.add_argument(
+        "--run",
+        action="store_true",
+        default=False,
+        help="Execute the stage after generating it.",
+    )
     parser.add_argument(
         "command",
         nargs=argparse.REMAINDER,

dvc/compare.py

@@ -22,7 +22,6 @@ from typing import (
 from funcy import reraise
 
 if TYPE_CHECKING:
-    from dvc.types import StrPath
     from dvc.ui.table import CellT
 
 
@@ -35,7 +34,7 @@ def with_value(value, default):
 
 
 class TabularData(MutableSequence[Sequence["CellT"]]):
-    def __init__(self, columns: Sequence[str], fill_value: str = ""):
+    def __init__(self, columns: Sequence[str], fill_value: Optional[str] = ""):
         self._columns: Dict[str, Column] = {name: Column() for name in columns}
         self._keys: List[str] = list(columns)
         self._fill_value = fill_value
@@ -161,24 +160,6 @@ class TabularData(MutableSequence[Sequence["CellT"]]):
             writer.writerow(row)
         return buff.getvalue()
 
-    def to_parallel_coordinates(
-        self, output_path: "StrPath", color_by: Optional[str] = None
-    ) -> "StrPath":
-        from dvc_render.html import render_html
-        from dvc_render.plotly import ParallelCoordinatesRenderer
-
-        render_html(
-            renderers=[
-                ParallelCoordinatesRenderer(
-                    self.as_dict(),
-                    color_by=color_by,
-                    fill_value=self._fill_value,
-                )
-            ],
-            output_file=output_path,
-        )
-        return output_path
-
     def add_column(self, name: str) -> None:
         self._columns[name] = Column([self._fill_value] * len(self))
         self._keys.append(name)

dvc/config.py

@@ -79,9 +79,6 @@ class Config(dict):
         ConfigError: thrown if config has an invalid format.
     """
 
-    APPNAME = "dvc"
-    APPAUTHOR = "iterative"
-
     SYSTEM_LEVELS = ("system", "global")
     REPO_LEVELS = ("repo", "local")
     # In the order they shadow each other
@@ -121,14 +118,14 @@ class Config(dict):
 
     @classmethod
     def get_dir(cls, level):
-        from platformdirs import site_config_dir, user_config_dir
+        from dvc.dirs import global_config_dir, system_config_dir
 
         assert level in ("global", "system")
 
         if level == "global":
-            return user_config_dir(cls.APPNAME, cls.APPAUTHOR)
+            return global_config_dir()
         if level == "system":
-            return site_config_dir(cls.APPNAME, cls.APPAUTHOR)
+            return system_config_dir()
 
     @cached_property
     def files(self) -> Dict[str, str]:

dvc/config_schema.py

@@ -154,13 +154,13 @@ SCHEMA = {
         "machine": Lower,
     },
     "cache": {
-        "local": str,
-        "s3": str,
-        "gs": str,
-        "hdfs": str,
-        "webhdfs": str,
-        "ssh": str,
-        "azure": str,
+        "local": str,  # obsoleted
+        "s3": str,  # obsoleted
+        "gs": str,  # obsoleted
+        "hdfs": str,  # obsoleted
+        "webhdfs": str,  # obsoleted
+        "ssh": str,  # obsoleted
+        "azure": str,  # obsoleted
         # This is for default local cache
         "dir": str,
         **LOCAL_COMMON,
@@ -302,9 +302,6 @@ SCHEMA = {
     "feature": FeatureSchema(
         {
             Optional("machine", default=False): Bool,
-            Optional("push_exp_to_studio", default=False): Bool,
-            "studio_token": str,
-            "studio_url": str,
         },
     ),
     "plots": {
@@ -330,4 +327,10 @@ SCHEMA = {
         "config_dir": str,
         "config_name": str,
     },
+    "studio": {
+        "token": str,
+        "url": str,
+        "repo_url": str,
+        Optional("offline", default=False): Bool,
+    },
 }

dvc/data_cloud.py

@@ -1,18 +1,18 @@
 """Manages dvc remotes that user can use with push/pull/status commands."""
 
 import logging
-from typing import TYPE_CHECKING, Iterable, Optional
+from typing import TYPE_CHECKING, Iterable, Optional, Set, Tuple
 
 from dvc.config import NoRemoteError, RemoteConfigError
 from dvc.utils.objects import cached_property
 from dvc_data.hashfile.db import get_index
+from dvc_data.hashfile.transfer import TransferResult
 
 if TYPE_CHECKING:
     from dvc.fs import FileSystem
     from dvc_data.hashfile.db import HashFileDB
     from dvc_data.hashfile.hash_info import HashInfo
     from dvc_data.hashfile.status import CompareStatusResult
-    from dvc_data.hashfile.transfer import TransferResult
 
 logger = logging.getLogger(__name__)
 
@@ -29,13 +29,40 @@ class Remote:
 
     @cached_property
     def odb(self) -> "HashFileDB":
+        from dvc.cachemgr import CacheManager
         from dvc_data.hashfile.db import get_odb
+        from dvc_data.hashfile.hash import DEFAULT_ALGORITHM
 
         path = self.path
         if self.worktree:
-            path = self.fs.path.join(path, ".dvc", "cache")
+            path = self.fs.path.join(
+                path, ".dvc", CacheManager.FILES_DIR, DEFAULT_ALGORITHM
+            )
+        else:
+            path = self.fs.path.join(path, CacheManager.FILES_DIR, DEFAULT_ALGORITHM)
+        return get_odb(self.fs, path, hash_name=DEFAULT_ALGORITHM, **self.config)
 
-        return get_odb(self.fs, path, hash_name="md5", **self.config)
+    @cached_property
+    def legacy_odb(self) -> "HashFileDB":
+        from dvc_data.hashfile.db import get_odb
+
+        path = self.path
+        return get_odb(self.fs, path, hash_name="md5-dos2unix", **self.config)
+
+
+def _split_legacy_hash_infos(
+    hash_infos: Iterable["HashInfo"],
+) -> Tuple[Set["HashInfo"], Set["HashInfo"]]:
+    from dvc.cachemgr import LEGACY_HASH_NAMES
+
+    legacy = set()
+    default = set()
+    for hi in hash_infos:
+        if hi.name in LEGACY_HASH_NAMES:
+            legacy.add(hi)
+        else:
+            default.add(hi)
+    return legacy, default
 
 
 class DataCloud:
@@ -101,12 +128,17 @@ class DataCloud:
         self,
         name: Optional[str] = None,
         command: str = "<command>",
+        hash_name: str = "md5",
     ) -> "HashFileDB":
+        from dvc.cachemgr import LEGACY_HASH_NAMES
+
         remote = self.get_remote(name=name, command=command)
         if remote.fs.version_aware or remote.worktree:
             raise NoRemoteError(
                 f"'{command}' is unsupported for cloud versioned remotes"
             )
+        if hash_name in LEGACY_HASH_NAMES:
+            return remote.legacy_odb
         return remote.odb
 
     def _log_missing(self, status: "CompareStatusResult"):
@@ -150,14 +182,40 @@ class DataCloud:
                 By default remote from core.remote config option is used.
             odb: optional ODB to push to. Overrides remote.
         """
-        odb = odb or self.get_remote_odb(remote, "push")
+        if odb is not None:
+            return self._push(objs, jobs=jobs, odb=odb)
+        legacy_objs, default_objs = _split_legacy_hash_infos(objs)
+        result = TransferResult(set(), set())
+        if legacy_objs:
+            odb = self.get_remote_odb(remote, "push", hash_name="md5-dos2unix")
+            t, f = self._push(legacy_objs, jobs=jobs, odb=odb)
+            result.transferred.update(t)
+            result.failed.update(f)
+        if default_objs:
+            odb = self.get_remote_odb(remote, "push")
+            t, f = self._push(default_objs, jobs=jobs, odb=odb)
+            result.transferred.update(t)
+            result.failed.update(f)
+        return result
+
+    def _push(
+        self,
+        objs: Iterable["HashInfo"],
+        *,
+        jobs: Optional[int] = None,
+        odb: "HashFileDB",
+    ) -> "TransferResult":
+        if odb.hash_name == "md5-dos2unix":
+            cache = self.repo.cache.legacy
+        else:
+            cache = self.repo.cache.local
         return self.transfer(
-            self.repo.cache.local,
+            cache,
             odb,
             objs,
             jobs=jobs,
             dest_index=get_index(odb),
-            cache_odb=self.repo.cache.local,
+            cache_odb=cache,
             validate_status=self._log_missing,
         )
 
@@ -177,14 +235,41 @@ class DataCloud:
                 By default remote from core.remote config option is used.
             odb: optional ODB to pull from. Overrides remote.
         """
-        odb = odb or self.get_remote_odb(remote, "pull")
+        if odb is not None:
+            return self._pull(objs, jobs=jobs, odb=odb)
+        legacy_objs, default_objs = _split_legacy_hash_infos(objs)
+        result = TransferResult(set(), set())
+        if legacy_objs:
+            odb = self.get_remote_odb(remote, "pull", hash_name="md5-dos2unix")
+            assert odb.hash_name == "md5-dos2unix"
+            t, f = self._pull(legacy_objs, jobs=jobs, odb=odb)
+            result.transferred.update(t)
+            result.failed.update(f)
+        if default_objs:
+            odb = self.get_remote_odb(remote, "pull")
+            t, f = self._pull(default_objs, jobs=jobs, odb=odb)
+            result.transferred.update(t)
+            result.failed.update(f)
+        return result
+
+    def _pull(
+        self,
+        objs: Iterable["HashInfo"],
+        *,
+        jobs: Optional[int] = None,
+        odb: "HashFileDB",
+    ) -> "TransferResult":
+        if odb.hash_name == "md5-dos2unix":
+            cache = self.repo.cache.legacy
+        else:
+            cache = self.repo.cache.local
         return self.transfer(
             odb,
-            self.repo.cache.local,
+            cache,
             objs,
             jobs=jobs,
             src_index=get_index(odb),
-            cache_odb=self.repo.cache.local,
+            cache_odb=cache,
             verify=odb.verify,
             validate_status=self._log_missing,
         )
@@ -206,17 +291,49 @@ class DataCloud:
                 is used.
             odb: optional ODB to check status from. Overrides remote.
         """
+        from dvc_data.hashfile.status import CompareStatusResult
+
+        if odb is not None:
+            return self._status(objs, jobs=jobs, odb=odb)
+        result = CompareStatusResult(set(), set(), set(), set())
+        legacy_objs, default_objs = _split_legacy_hash_infos(objs)
+        if legacy_objs:
+            odb = self.get_remote_odb(remote, "status", hash_name="md5-dos2unix")
+            assert odb.hash_name == "md5-dos2unix"
+            o, m, n, d = self._status(legacy_objs, jobs=jobs, odb=odb)
+            result.ok.update(o)
+            result.missing.update(m)
+            result.new.update(n)
+            result.deleted.update(d)
+        if default_objs:
+            odb = self.get_remote_odb(remote, "status")
+            o, m, n, d = self._status(default_objs, jobs=jobs, odb=odb)
+            result.ok.update(o)
+            result.missing.update(m)
+            result.new.update(n)
+            result.deleted.update(d)
+        return result
+
+    def _status(
+        self,
+        objs: Iterable["HashInfo"],
+        *,
+        jobs: Optional[int] = None,
+        odb: "HashFileDB",
+    ):
         from dvc_data.hashfile.status import compare_status
 
-        if not odb:
-            odb = self.get_remote_odb(remote, "status")
+        if odb.hash_name == "md5-dos2unix":
+            cache = self.repo.cache.legacy
+        else:
+            cache = self.repo.cache.local
         return compare_status(
-            self.repo.cache.local,
+            cache,
             odb,
             objs,
             jobs=jobs,
             dest_index=get_index(odb),
-            cache_odb=self.repo.cache.local,
+            cache_odb=cache,
         )
 
     def get_url_for(self, remote, checksum):

dvc/dependency/__init__.py

@@ -14,7 +14,6 @@ from .repo import RepoDependency
 SCHEMA: Mapping[str, Any] = {
     **ARTIFACT_SCHEMA,
     **RepoDependency.REPO_SCHEMA,
-    **ParamsDependency.PARAM_SCHEMA,
     Output.PARAM_FILES: [DIR_FILES_SCHEMA],
 }
 
@@ -36,7 +35,8 @@ def loadd_from(stage, d_list):
     for d in d_list:
         p = d.pop(Output.PARAM_PATH, None)
         files = d.pop(Output.PARAM_FILES, None)
-        ret.append(_get(stage, p, d, files=files))
+        hash_name = d.pop(Output.PARAM_HASH, None)
+        ret.append(_get(stage, p, d, files=files, hash_name=hash_name))
     return ret
 
 

dvc/dependency/param.py

@@ -2,10 +2,9 @@ import logging
 import os
 import typing
 from collections import defaultdict
-from typing import Dict
+from typing import Any, Dict
 
 import dpath
-from voluptuous import Any
 
 from dvc.exceptions import DvcException
 from dvc.utils.serialize import ParseError, load_path
@@ -34,7 +33,6 @@ class BadParamFileError(DvcException):
 
 class ParamsDependency(Dependency):
     PARAM_PARAMS = "params"
-    PARAM_SCHEMA = {PARAM_PARAMS: Any(dict, list, None)}
     DEFAULT_PARAMS_FILE = "params.yaml"
 
     def __init__(self, stage, path, params=None, repo=None):
@@ -48,6 +46,7 @@ class ParamsDependency(Dependency):
         repo = repo or stage.repo
         path = path or os.path.join(repo.root_dir, self.DEFAULT_PARAMS_FILE)
         super().__init__(stage, path, repo=repo)
+        self.hash_name = self.PARAM_PARAMS
         self.hash_info = hash_info
 
     def dumpd(self, **kwargs):

dvc/dependency/repo.py

@@ -79,10 +79,14 @@ class RepoDependency(Dependency):
     ) -> "DVCFileSystem":
         from dvc.fs import DVCFileSystem
 
+        config = {"cache": self.repo.config["cache"]}
+        config["cache"]["dir"] = self.repo.cache.local_cache_dir
+
         return DVCFileSystem(
             url=self.def_repo[self.PARAM_URL],
             rev=rev or self._get_rev(locked=locked),
             subrepos=True,
+            config=config,
         )
 
     def _get_rev(self, locked: bool = True):

dvc/dirs.py

@@ -0,0 +1,26 @@
+import os
+
+import platformdirs
+
+from . import env
+
+APPNAME = "dvc"
+APPAUTHOR = "iterative"
+
+
+def system_config_dir():
+    return os.getenv(env.DVC_SYSTEM_CONFIG_DIR) or platformdirs.site_config_dir(
+        APPNAME, APPAUTHOR
+    )
+
+
+def global_config_dir():
+    return os.getenv(env.DVC_SYSTEM_CONFIG_DIR) or platformdirs.user_config_dir(
+        APPNAME, APPAUTHOR
+    )
+
+
+def site_cache_dir():
+    return os.getenv(env.DVC_SITE_CACHE_DIR) or platformdirs.site_cache_dir(
+        APPNAME, APPAUTHOR, opinion=True
+    )

dvc/dvcfile.py

@@ -14,7 +14,6 @@ from typing import (
 )
 
 from dvc.exceptions import DvcException
-from dvc.parsing.versions import LOCKFILE_VERSION, SCHEMA_KWD
 from dvc.stage import serialize
 from dvc.stage.exceptions import (
     StageFileBadNameError,
@@ -36,7 +35,6 @@ if TYPE_CHECKING:
 logger = logging.getLogger(__name__)
 _T = TypeVar("_T")
 
-DVC_FILE = "Dvcfile"
 DVC_FILE_SUFFIX = ".dvc"
 PROJECT_FILE = "dvc.yaml"
 LOCK_FILE = "dvc.lock"
@@ -56,10 +54,7 @@ class ParametrizedDumpError(DvcException):
 
 
 def is_valid_filename(path):
-    return path.endswith(DVC_FILE_SUFFIX) or os.path.basename(path) in [
-        DVC_FILE,
-        PROJECT_FILE,
-    ]
+    return path.endswith(DVC_FILE_SUFFIX) or os.path.basename(path) == PROJECT_FILE
 
 
 def is_dvc_file(path):
@@ -358,36 +353,8 @@ class ProjectFile(FileMixin):
         raise NotImplementedError
 
 
-def get_lockfile_schema(d):
-    from dvc.schema import COMPILED_LOCKFILE_V1_SCHEMA, COMPILED_LOCKFILE_V2_SCHEMA
-
-    schema = {
-        LOCKFILE_VERSION.V1: COMPILED_LOCKFILE_V1_SCHEMA,
-        LOCKFILE_VERSION.V2: COMPILED_LOCKFILE_V2_SCHEMA,
-    }
-
-    version = LOCKFILE_VERSION.from_dict(d)
-    return schema[version]
-
-
-def migrate_lock_v1_to_v2(d, version_info):
-    stages = dict(d)
-
-    for key in stages:
-        d.pop(key)
-
-    # forcing order, meta should always be at the top
-    d.update(version_info)
-    d["stages"] = stages
-
-
-def lockfile_schema(data: _T) -> _T:
-    schema = get_lockfile_schema(data)
-    return schema(data)
-
-
 class Lockfile(FileMixin):
-    SCHEMA = staticmethod(lockfile_schema)  # type: ignore[assignment]
+    from dvc.schema import COMPILED_LOCKFILE_SCHEMA as SCHEMA
 
     def _verify_filename(self):
         pass  # lockfile path is hardcoded, so no need to verify here
@@ -401,21 +368,12 @@ class Lockfile(FileMixin):
             self._check_gitignored()
             return {}, ""
 
-    @property
-    def latest_version_info(self):
-        version = LOCKFILE_VERSION.V2.value  # pylint:disable=no-member
-        return {SCHEMA_KWD: version}
-
     def dump(self, stage, **kwargs):
         stage_data = serialize.to_lockfile(stage, **kwargs)
 
         with modify_yaml(self.path, fs=self.repo.fs) as data:
-            version = LOCKFILE_VERSION.from_dict(data)
-            if version == LOCKFILE_VERSION.V1:
-                logger.info("Migrating lock file '%s' from v1 to v2", self.relpath)
-                migrate_lock_v1_to_v2(data, self.latest_version_info)
-            elif not data:
-                data.update(self.latest_version_info)
+            if not data:
+                data.update({"schema": "2.0"})
                 # order is important, meta should always be at the top
                 logger.info("Generating lock file '%s'", self.relpath)
 
@@ -436,8 +394,7 @@ class Lockfile(FileMixin):
             return
 
         d, _ = self._load_yaml(round_trip=True)
-        version = LOCKFILE_VERSION.from_dict(d)
-        data = d if version == LOCKFILE_VERSION.V1 else d.get("stages", {})
+        data = d.get("stages", {})
         if stage.name not in data:
             return
 

dvc/env.py

@@ -1,12 +1,17 @@
-DVC_CHECKPOINT = "DVC_CHECKPOINT"
 DVC_DAEMON = "DVC_DAEMON"
+DVC_EXP_AUTO_PUSH = "DVC_EXP_AUTO_PUSH"
+DVC_EXP_BASELINE_REV = "DVC_EXP_BASELINE_REV"
+DVC_EXP_GIT_REMOTE = "DVC_EXP_GIT_REMOTE"
+DVC_EXP_NAME = "DVC_EXP_NAME"
+DVC_GLOBAL_CONFIG_DIR = "DVC_GLOBAL_CONFIG_DIR"
+DVC_IGNORE_ISATTY = "DVC_IGNORE_ISATTY"
+DVC_NO_ANALYTICS = "DVC_NO_ANALYTICS"
 DVC_PAGER = "DVC_PAGER"
 DVC_ROOT = "DVC_ROOT"
-DVCLIVE_RESUME = "DVCLIVE_RESUME"
-DVC_IGNORE_ISATTY = "DVC_IGNORE_ISATTY"
-DVC_EXP_BASELINE_REV = "DVC_EXP_BASELINE_REV"
-DVC_EXP_NAME = "DVC_EXP_NAME"
-DVC_EXP_GIT_REMOTE = "DVC_EXP_GIT_REMOTE"
-DVC_EXP_AUTO_PUSH = "DVC_EXP_AUTO_PUSH"
-DVC_NO_ANALYTICS = "DVC_NO_ANALYTICS"
 DVC_SHOW_TRACEBACK = "DVC_SHOW_TRACEBACK"
+DVC_SITE_CACHE_DIR = "DVC_SITE_CACHE_DIR"
+DVC_STUDIO_OFFLINE = "DVC_STUDIO_OFFLINE"
+DVC_STUDIO_REPO_URL = "DVC_STUDIO_REPO_URL"
+DVC_STUDIO_TOKEN = "DVC_STUDIO_TOKEN"  # noqa: S105 # nosec B105
+DVC_STUDIO_URL = "DVC_STUDIO_URL"
+DVC_SYSTEM_CONFIG_DIR = "DVC_SYSTEM_CONFIG_DIR"

dvc/exceptions.py

@@ -1,4 +1,5 @@
 """Exceptions raised by the dvc."""
+import errno
 from typing import Dict, List
 
 from dvc.utils import format_link
@@ -181,11 +182,6 @@ class BadMetricError(DvcException):
         )
 
 
-class RecursiveAddingWhileUsingFilename(DvcException):
-    def __init__(self):
-        super().__init__("cannot use `fname` with multiple targets or `-R|--recursive`")
-
-
 class OverlappingOutputPathsError(DvcException):
     def __init__(self, parent, overlapping_out, message):
         self.parent = parent
@@ -206,6 +202,18 @@ class ETagMismatchError(DvcException):
         )
 
 
+class FileExistsLocallyError(FileExistsError, DvcException):
+    def __init__(self, path, hint=None):
+        import os.path
+
+        self.path = path
+        hint = "" if hint is None else f". {hint}"
+        path_typ = "directory" if os.path.isdir(path) else "file"
+        msg = f"The {path_typ} '{path}' already exists locally{hint}"
+        super().__init__(msg)
+        self.errno = errno.EEXIST
+
+
 class FileMissingError(DvcException):
     def __init__(self, path, hint=None):
         self.path = path
@@ -291,21 +299,6 @@ class URLMissingError(DvcException):
         super().__init__(f"The path '{url}' does not exist")
 
 
-class RemoteCacheRequiredError(DvcException):
-    def __init__(self, scheme, fs_path):
-        super().__init__(
-            (
-                "Current operation was unsuccessful because '{}' requires "
-                "existing cache on '{}' remote. See {} for information on how "
-                "to set up remote cache."
-            ).format(
-                fs_path,
-                scheme,
-                format_link("https://man.dvc.org/config#cache"),
-            )
-        )
-
-
 class IsADirectoryError(DvcException):  # noqa,pylint:disable=redefined-builtin
     """Raised when a file operation is requested on a directory."""
 

dvc/fs/callbacks.py

@@ -2,12 +2,9 @@
 from contextlib import ExitStack
 from typing import TYPE_CHECKING, Any, BinaryIO, Dict, Optional, Union
 
+from dvc.progress import Tqdm
 from dvc.utils.objects import cached_property
-from dvc_objects.fs.callbacks import (  # noqa: F401
-    DEFAULT_CALLBACK,
-    Callback,
-    TqdmCallback,
-)
+from dvc_objects.fs.callbacks import DEFAULT_CALLBACK, Callback  # noqa: F401
 
 if TYPE_CHECKING:
     from rich.progress import TaskID
@@ -15,6 +12,59 @@ if TYPE_CHECKING:
     from dvc.ui._rich_progress import RichTransferProgress
 
 
+# NOTE: this is very similar to dvc-objects.fs.callbacks.TqdmCallback,
+# but it works with our own Tqdm instance.
+class TqdmCallback(Callback):
+    def __init__(
+        self,
+        size: Optional[int] = None,
+        value: int = 0,
+        progress_bar: Optional["Tqdm"] = None,
+        **tqdm_kwargs,
+    ):
+        tqdm_kwargs["total"] = size or -1
+        self._tqdm_kwargs = tqdm_kwargs
+        self._progress_bar = progress_bar
+        self._stack = ExitStack()
+        super().__init__(size=size, value=value)
+
+    @cached_property
+    def progress_bar(self):
+        progress_bar = (
+            self._progress_bar
+            if self._progress_bar is not None
+            else Tqdm(**self._tqdm_kwargs)
+        )
+        return self._stack.enter_context(progress_bar)
+
+    def __enter__(self):
+        return self
+
+    def close(self):
+        self._stack.close()
+
+    def set_size(self, size):
+        # Tqdm tries to be smart when to refresh,
+        # so we try to force it to re-render.
+        super().set_size(size)
+        self.progress_bar.refresh()
+
+    def call(self, hook_name=None, **kwargs):  # noqa: ARG002
+        self.progress_bar.update_to(self.value, total=self.size)
+
+    def branch(
+        self,
+        path_1: "Union[str, BinaryIO]",
+        path_2: str,
+        kwargs: Dict[str, Any],
+        child: Optional[Callback] = None,
+    ):
+        child = child or TqdmCallback(
+            bytes=True, desc=path_1 if isinstance(path_1, str) else path_2
+        )
+        return super().branch(path_1, path_2, kwargs, child=child)
+
+
 class RichCallback(Callback):
     def __init__(
         self,

dvc/fs/dvc.py

@@ -38,12 +38,17 @@ def _is_dvc_file(fname):
     return is_valid_filename(fname) or fname == DvcIgnore.DVCIGNORE_FILE
 
 
-def _merge_info(repo, fs_info, dvc_info):
+def _merge_info(repo, key, fs_info, dvc_info):
     from . import utils
 
     ret = {"repo": repo}
 
     if dvc_info:
+        dvc_info["isout"] = any(
+            (len(out_key) <= len(key) and key[: len(out_key)] == out_key)
+            for out_key in repo.index.data_keys["repo"]
+        )
+        dvc_info["isdvc"] = dvc_info["isout"]
         ret["dvc_info"] = dvc_info
         ret["type"] = dvc_info["type"]
         ret["size"] = dvc_info["size"]
@@ -263,10 +268,10 @@ class _DVCFileSystem(AbstractFileSystem):  # pylint:disable=abstract-method
 
     def isdvc(self, path, **kwargs) -> bool:
         """Is this entry dvc-tracked?"""
-        key = self._get_key_from_relative(path)
-        _, dvc_fs, subkey = self._get_subrepo_info(key)
-        dvc_path = _get_dvc_path(dvc_fs, subkey)
-        return dvc_fs is not None and dvc_fs.isdvc(dvc_path, **kwargs)
+        try:
+            return self.info(path).get("dvc_info", {}).get("isout", False)
+        except FileNotFoundError:
+            return False
 
     def ls(  # pylint: disable=arguments-differ # noqa: C901
         self, path, detail=True, dvc_only=False, **kwargs
@@ -314,7 +319,9 @@ class _DVCFileSystem(AbstractFileSystem):  # pylint:disable=abstract-method
                 continue
 
             entry_path = self.path.join(path, name)
-            info = _merge_info(repo, fs_infos.get(name), dvc_infos.get(name))
+            info = _merge_info(
+                repo, (*subkey, name), fs_infos.get(name), dvc_infos.get(name)
+            )
             info["name"] = entry_path
             infos.append(info)
             paths.append(entry_path)
@@ -370,7 +377,7 @@ class _DVCFileSystem(AbstractFileSystem):  # pylint:disable=abstract-method
         if not dvc_info and not fs_info:
             raise FileNotFoundError
 
-        info = _merge_info(repo, fs_info, dvc_info)
+        info = _merge_info(repo, subkey, fs_info, dvc_info)
         info["name"] = path
         return info
 

dvc/info.py

@@ -6,13 +6,12 @@ import platform
 
 import psutil
 
-from dvc import __version__
+from dvc import PKG, __version__
 from dvc.exceptions import NotDvcRepoError
 from dvc.fs import Schemes, generic, get_fs_cls, get_fs_config, registry
 from dvc.repo import Repo
 from dvc.scm import SCMError
 from dvc.utils import error_link
-from dvc.utils.pkg import PKG
 
 SUBPROJECTS = (
     "dvc_data",
@@ -32,6 +31,7 @@ def get_dvc_info():
         f"Platform: Python {platform.python_version()} on {platform.platform()}",
         f"Subprojects:{_get_subprojects()}",
         f"Supports:{_get_supported_remotes()}",
+        f"Config:{_get_config_dirs()}",
     ]
 
     try:
@@ -42,7 +42,7 @@ def get_dvc_info():
             # `dvc config cache.shared group`.
             if os.path.exists(repo.cache.local.path):
                 info.append(f"Cache types: {_get_linktype_support_info(repo)}")
-                fs_type = get_fs_type(repo.cache.local.path)
+                fs_type = _get_fs_type(repo.cache.local.path)
                 info.append(f"Cache directory: {fs_type}")
             else:
                 info.append("Cache types: " + error_link("no-dvc-cache"))
@@ -51,7 +51,7 @@ def get_dvc_info():
             info.append(f"Remotes: {_get_remotes(repo.config)}")
 
             root_directory = repo.root_dir
-            fs_root = get_fs_type(os.path.abspath(root_directory))
+            fs_root = _get_fs_type(os.path.abspath(root_directory))
             info.append(f"Workspace directory: {fs_root}")
             info.append(f"Repo: {_get_dvc_repo_info(repo)}")
             info.append(f"Repo.site_cache_dir: {repo.site_cache_dir}")
@@ -67,7 +67,7 @@ def _get_caches(cache):
     caches = (
         cache_type
         for cache_type, cache_instance in cache.by_scheme()
-        if cache_instance and cache_type != "repo"
+        if cache_instance and cache_type not in ("repo", "legacy")
     )
 
     # Caches will be always non-empty including the local cache
@@ -136,7 +136,18 @@ def _get_supported_remotes():
     return "\n\t" + ",\n\t".join(supported_remotes)
 
 
-def get_fs_type(path):
+def _get_config_dirs():
+    from dvc.config import Config
+
+    dirs = [
+        f"Global: {Config.get_dir('global')}",
+        f"System: {Config.get_dir('system')}",
+    ]
+
+    return "\n\t" + "\n\t".join(dirs)
+
+
+def _get_fs_type(path):
     partition = {}
     for part in psutil.disk_partitions(all=True):
         if part.fstype:
@@ -155,11 +166,11 @@ def get_fs_type(path):
     return ("unknown", "none")
 
 
-def _get_dvc_repo_info(self):
-    if self.config.get("core", {}).get("no_scm", False):
+def _get_dvc_repo_info(repo):
+    if repo.config.get("core", {}).get("no_scm", False):
         return "dvc (no_scm)"
 
-    if self.root_dir != self.scm.root_dir:
+    if repo.root_dir != repo.scm.root_dir:
         return "dvc (subdir), git"
 
     return "dvc, git"

dvc/main.py

@@ -1,2 +0,0 @@
-# TODO: remove in 3.0, kept for backward compatibility
-from .cli import main  # noqa: F401, pylint: disable=unused-import

dvc/output.py

@@ -1,10 +1,11 @@
+import errno
 import logging
 import os
 import posixpath
 from collections import defaultdict
 from contextlib import suppress
 from operator import itemgetter
-from typing import TYPE_CHECKING, Dict, List, Optional, Set, Tuple, Type
+from typing import TYPE_CHECKING, Dict, List, Optional, Set, Tuple, Type, Union
 from urllib.parse import urlparse
 
 from funcy import collecting, first, project
@@ -18,33 +19,32 @@ from dvc.exceptions import (
     ConfirmRemoveError,
     DvcException,
     MergeError,
-    RemoteCacheRequiredError,
 )
 from dvc.utils.objects import cached_property
 from dvc_data.hashfile import check as ocheck
 from dvc_data.hashfile import load as oload
 from dvc_data.hashfile.build import build
 from dvc_data.hashfile.checkout import checkout
+from dvc_data.hashfile.db import HashFileDB, add_update_tree
+from dvc_data.hashfile.hash import DEFAULT_ALGORITHM
 from dvc_data.hashfile.hash_info import HashInfo
 from dvc_data.hashfile.istextfile import istextfile
 from dvc_data.hashfile.meta import Meta
 from dvc_data.hashfile.transfer import transfer as otransfer
-from dvc_data.hashfile.tree import Tree
+from dvc_data.hashfile.tree import Tree, du
 from dvc_objects.errors import ObjectFormatError
 
 from .annotations import ANNOTATION_FIELDS, ANNOTATION_SCHEMA, Annotation
 from .fs import LocalFileSystem, RemoteMissingDepsError, Schemes, get_cloud_fs
-from .fs.callbacks import DEFAULT_CALLBACK
+from .fs.callbacks import DEFAULT_CALLBACK, Callback, TqdmCallback
 from .utils import relpath
 from .utils.fs import path_isin
 
 if TYPE_CHECKING:
-    from dvc_data.hashfile.db import HashFileDB
     from dvc_data.hashfile.obj import HashFile
     from dvc_data.index import DataIndexKey
     from dvc_objects.db import ObjectDB
 
-    from .fs.callbacks import Callback
     from .ignore import DvcIgnoreFilter
 
 logger = logging.getLogger(__name__)
@@ -64,7 +64,7 @@ CASE_SENSITIVE_CHECKSUM_SCHEMA = Any(
 
 # NOTE: currently there are only 3 possible checksum names:
 #
-#    1) md5 (LOCAL, SSH);
+#    1) md5 (LOCAL, SSH) (actually DVC 2.x md5-dos2unix)
 #    2) etag (S3, GS, OSS, AZURE, HTTP);
 #    3) checksum (HDFS);
 #
@@ -73,7 +73,7 @@ CASE_SENSITIVE_CHECKSUM_SCHEMA = Any(
 HDFS_PARAM_CHECKSUM = "checksum"
 S3_PARAM_CHECKSUM = "etag"
 CHECKSUMS_SCHEMA = {
-    LocalFileSystem.PARAM_CHECKSUM: CHECKSUM_SCHEMA,
+    "md5": CHECKSUM_SCHEMA,  # DVC 2.x md5-dos2unix
     HDFS_PARAM_CHECKSUM: CHECKSUM_SCHEMA,
     S3_PARAM_CHECKSUM: CASE_SENSITIVE_CHECKSUM_SCHEMA,
 }
@@ -91,11 +91,11 @@ def loadd_from(stage, d_list):
         metric = d.pop(Output.PARAM_METRIC, False)
         plot = d.pop(Output.PARAM_PLOT, False)
         persist = d.pop(Output.PARAM_PERSIST, False)
-        checkpoint = d.pop(Output.PARAM_CHECKPOINT, False)
         remote = d.pop(Output.PARAM_REMOTE, None)
         annot = {field: d.pop(field, None) for field in ANNOTATION_FIELDS}
         files = d.pop(Output.PARAM_FILES, None)
         push = d.pop(Output.PARAM_PUSH, True)
+        hash_name = d.pop(Output.PARAM_HASH, None)
         ret.append(
             _get(
                 stage,
@@ -105,11 +105,11 @@ def loadd_from(stage, d_list):
                 metric=metric,
                 plot=plot,
                 persist=persist,
-                checkpoint=checkpoint,
                 remote=remote,
                 **annot,
                 files=files,
                 push=push,
+                hash_name=hash_name,
             )
         )
     return ret
@@ -122,7 +122,6 @@ def loads_from(
     metric=False,
     plot=False,
     persist=False,
-    checkpoint=False,
     remote=None,
     push=True,
 ):
@@ -135,7 +134,6 @@ def loads_from(
             metric=metric,
             plot=plot,
             persist=persist,
-            checkpoint=checkpoint,
             remote=remote,
             push=push,
         )
@@ -191,7 +189,6 @@ def load_from_pipeline(stage, data, typ="outs"):
             [
                 Output.PARAM_CACHE,
                 Output.PARAM_PERSIST,
-                Output.PARAM_CHECKPOINT,
                 Output.PARAM_REMOTE,
                 Output.PARAM_PUSH,
                 *ANNOTATION_FIELDS,
@@ -232,17 +229,29 @@ def merge_file_meta_from_cloud(entry: Dict) -> Dict:
     return entry
 
 
-def _serialize_tree_obj_to_files(obj: "Tree") -> List[Dict[str, Any]]:
+def _serialize_tree_obj_to_files(obj: Tree) -> List[Dict[str, Any]]:
     key = obj.PARAM_RELPATH
     return sorted(
         (
-            {key: posixpath.sep.join(parts), **hi.to_dict(), **meta.to_dict()}
+            {
+                key: posixpath.sep.join(parts),
+                **_serialize_hi_to_dict(hi),
+                **meta.to_dict(),
+            }
             for parts, meta, hi in obj
         ),
         key=itemgetter(key),
     )
 
 
+def _serialize_hi_to_dict(hash_info: Optional[HashInfo]) -> Dict[str, Any]:
+    if hash_info:
+        if hash_info.name == "md5-dos2unix":
+            return {"md5": hash_info.value}
+        return hash_info.to_dict()
+    return {}
+
+
 class OutputDoesNotExistError(DvcException):
     def __init__(self, path):
         msg = f"output '{path}' does not exist"
@@ -276,12 +285,16 @@ class OutputIsIgnoredError(DvcException):
         super().__init__(f"Path '{match.file}' is ignored by\n{lines}")
 
 
+class CheckoutCallback(TqdmCallback):
+    # disable branching for checkouts
+    branch = Callback.branch  # type: ignore[assignment]
+
+
 class Output:
     IS_DEPENDENCY = False
 
     PARAM_PATH = "path"
     PARAM_CACHE = "cache"
-    PARAM_CHECKPOINT = "checkpoint"
     PARAM_FILES = "files"
     PARAM_METRIC = "metric"
     PARAM_METRIC_TYPE = "type"
@@ -298,15 +311,7 @@ class Output:
     PARAM_REMOTE = "remote"
     PARAM_PUSH = "push"
     PARAM_CLOUD = "cloud"
-
-    METRIC_SCHEMA = Any(
-        None,
-        bool,
-        {
-            PARAM_METRIC_TYPE: Any(str, None),
-            PARAM_METRIC_XPATH: Any(str, None),
-        },
-    )
+    PARAM_HASH = "hash"
 
     DoesNotExistError: Type[DvcException] = OutputDoesNotExistError
     IsNotFileOrDirError: Type[DvcException] = OutputIsNotFileOrDirError
@@ -322,7 +327,6 @@ class Output:
         metric=False,
         plot=False,
         persist=False,
-        checkpoint=False,
         desc=None,
         type=None,  # noqa: A002, pylint: disable=redefined-builtin
         labels=None,
@@ -332,6 +336,7 @@ class Output:
         fs_config=None,
         files: Optional[List[Dict[str, Any]]] = None,
         push: bool = True,
+        hash_name: Optional[str] = DEFAULT_ALGORITHM,
     ):
         self.annot = Annotation(
             desc=desc, type=type, labels=labels or [], meta=meta or {}
@@ -389,7 +394,6 @@ class Output:
         self.metric = False if self.IS_DEPENDENCY else metric
         self.plot = False if self.IS_DEPENDENCY else plot
         self.persist = persist
-        self.checkpoint = checkpoint
         self.can_push = push
 
         self.fs_path = self._parse_path(self.fs, fs_path)
@@ -404,21 +408,32 @@ class Output:
             )
             self.meta.version_id = version_id
 
-        if self.is_in_repo:
-            self.hash_name = "md5"
-        else:
-            self.hash_name = self.fs.PARAM_CHECKSUM
-
-        self.hash_info = HashInfo(
-            name=self.hash_name,
-            value=getattr(self.meta, self.hash_name, None),
-        )
+        self.hash_name, self.hash_info = self._compute_hash_info_from_meta(hash_name)
         self._compute_meta_hash_info_from_files()
 
+    def _compute_hash_info_from_meta(
+        self, hash_name: Optional[str]
+    ) -> Tuple[str, HashInfo]:
+        if self.is_in_repo:
+            if hash_name is None:
+                # Legacy 2.x output, use "md5-dos2unix" but read "md5" from
+                # file meta
+                hash_name = "md5-dos2unix"
+                meta_name = "md5"
+            else:
+                meta_name = hash_name
+        else:
+            hash_name = meta_name = self.fs.PARAM_CHECKSUM
+        assert hash_name
+
+        hash_info = HashInfo(
+            name=hash_name,
+            value=getattr(self.meta, meta_name, None),
+        )
+        return hash_name, hash_info
+
     def _compute_meta_hash_info_from_files(self) -> None:
         if self.files:
-            from dvc_data.hashfile.db import HashFileDB
-
             tree = Tree.from_list(self.files, hash_name=self.hash_name)
             tree.digest(with_meta=True)
             self.odb = HashFileDB(tree.fs, tree.path + ".odb")
@@ -431,7 +446,7 @@ class Output:
             self.meta.remote = first(f.get("remote") for f in self.files)
         elif self.meta.nfiles or self.hash_info and self.hash_info.isdir:
             self.meta.isdir = True
-            if not self.hash_info and self.hash_name != "md5":
+            if not self.hash_info and self.hash_name not in ("md5", "md5-dos2unix"):
                 md5 = getattr(self.meta, "md5", None)
                 if md5:
                     self.hash_info = HashInfo("md5", md5)
@@ -495,7 +510,7 @@ class Output:
             return False
 
         return self.repo and self.fs.path.isin(
-            self.fs.path.realpath(self.fs_path),
+            self.fs_path,
             self.repo.root_dir,
         )
 
@@ -508,11 +523,19 @@ class Output:
 
     @property
     def cache(self):
-        odb_name = "repo" if self.is_in_repo else self.protocol
-        odb = getattr(self.repo.cache, odb_name)
-        if self.use_cache and odb is None:
-            raise RemoteCacheRequiredError(self.fs.protocol, self.fs_path)
-        return odb
+        from dvc.cachemgr import LEGACY_HASH_NAMES
+
+        assert self.is_in_repo
+        odb_name = "legacy" if self.hash_name in LEGACY_HASH_NAMES else "repo"
+        return getattr(self.repo.cache, odb_name)
+
+    @property
+    def local_cache(self):
+        from dvc.cachemgr import LEGACY_HASH_NAMES
+
+        if self.hash_name in LEGACY_HASH_NAMES:
+            return self.repo.cache.legacy
+        return self.repo.cache.local
 
     @property
     def cache_path(self):
@@ -528,7 +551,7 @@ class Output:
         if self.use_cache:
             odb = self.cache
         else:
-            odb = self.repo.cache.local
+            odb = self.local_cache
         _, meta, obj = build(
             odb,
             self.fs_path,
@@ -669,6 +692,7 @@ class Output:
         if self.metric:
             self.verify_metric()
 
+        self._update_legacy_hash_name()
         if self.use_cache:
             _, self.meta, self.obj = build(
                 self.cache,
@@ -679,7 +703,7 @@ class Output:
             )
         else:
             _, self.meta, self.obj = build(
-                self.repo.cache.local,
+                self.local_cache,
                 self.fs_path,
                 self.fs,
                 self.hash_name,
@@ -692,6 +716,10 @@ class Output:
         self.hash_info = self.obj.hash_info
         self.files = None
 
+    def _update_legacy_hash_name(self):
+        if self.hash_name == "md5-dos2unix" and self.changed_checksum():
+            self.hash_name = "md5"
+
     def set_exec(self) -> None:
         if self.isfile() and self.meta.isexec:
             self.cache.set_exec(self.fs_path)
@@ -741,15 +769,18 @@ class Output:
                     hardlink=hardlink,
                 )
             if relink:
-                self._checkout(
-                    filter_info or self.fs_path,
-                    self.fs,
-                    obj,
-                    self.cache,
-                    relink=True,
-                    state=self.repo.state,
-                    prompt=prompt.confirm,
-                )
+                rel = self.fs.path.relpath(filter_info or self.fs_path)
+                with CheckoutCallback(desc=f"Checking out {rel}", unit="files") as cb:
+                    self._checkout(
+                        filter_info or self.fs_path,
+                        self.fs,
+                        obj,
+                        self.cache,
+                        relink=True,
+                        state=self.repo.state,
+                        prompt=prompt.confirm,
+                        progress_callback=cb,
+                    )
                 self.set_exec()
 
     def _commit_granular_dir(self, filter_info, hardlink) -> Optional["HashFile"]:
@@ -775,6 +806,8 @@ class Output:
         return checkout_obj
 
     def dumpd(self, **kwargs):  # noqa: C901, PLR0912
+        from dvc.cachemgr import LEGACY_HASH_NAMES
+
         ret: Dict[str, Any] = {}
         with_files = (
             (not self.IS_DEPENDENCY or self.stage.is_import)
@@ -785,7 +818,12 @@ class Output:
         if not with_files:
             meta_d = self.meta.to_dict()
             meta_d.pop("isdir", None)
-            ret.update(self.hash_info.to_dict())
+            if self.hash_name in LEGACY_HASH_NAMES:
+                # 2.x checksums get serialized with file meta
+                name = "md5" if self.hash_name == "md5-dos2unix" else self.hash_name
+                ret.update({name: self.hash_info.value})
+            else:
+                ret.update(self.hash_info.to_dict())
             ret.update(split_file_meta_from_cloud(meta_d))
 
         if self.is_in_repo:
@@ -793,6 +831,9 @@ class Output:
         else:
             path = self.def_path
 
+        if self.hash_name not in LEGACY_HASH_NAMES:
+            ret[self.PARAM_HASH] = "md5"
+
         ret[self.PARAM_PATH] = path
 
         if not self.IS_DEPENDENCY:
@@ -816,9 +857,6 @@ class Output:
             if self.persist:
                 ret[self.PARAM_PERSIST] = self.persist
 
-            if self.checkpoint:
-                ret[self.PARAM_CHECKPOINT] = self.checkpoint
-
             if self.remote:
                 ret[self.PARAM_REMOTE] = self.remote
 
@@ -888,12 +926,18 @@ class Output:
         relink: bool = False,
         filter_info: Optional[str] = None,
         allow_missing: bool = False,
-        checkpoint_reset: bool = False,
         **kwargs,
     ) -> Optional[Tuple[bool, Optional[bool]]]:
+        # callback passed act as a aggregate callback.
+        # do not let checkout to call set_size and change progressbar.
+        class CallbackProxy(Callback):
+            def relative_update(self, inc: int = 1) -> None:
+                progress_callback.relative_update(inc)
+                return super().relative_update(inc)
+
+        callback = CallbackProxy()
         if not self.use_cache:
-            if progress_callback != DEFAULT_CALLBACK:
-                progress_callback.relative_update(self.get_files_number(filter_info))
+            callback.relative_update(self.get_files_number(filter_info))
             return None
 
         obj = self.get_obj(filter_info=filter_info)
@@ -901,11 +945,6 @@ class Output:
             # backward compatibility
             return None
 
-        if self.checkpoint and checkpoint_reset:
-            if self.exists:
-                self.remove()
-            return None
-
         added = not self.exists
 
         try:
@@ -915,21 +954,24 @@ class Output:
                 obj,
                 self.cache,
                 force=force,
-                progress_callback=progress_callback,
+                progress_callback=callback,
                 relink=relink,
                 state=self.repo.state,
                 prompt=prompt.confirm,
                 **kwargs,
             )
         except CheckoutError:
-            if allow_missing or self.checkpoint:
+            if allow_missing:
                 return None
             raise
         self.set_exec()
         return added, False if added else modified
 
     def remove(self, ignore_remove=False):
-        self.fs.remove(self.fs_path, recursive=True)
+        try:
+            self.fs.remove(self.fs_path, recursive=True)
+        except FileNotFoundError:
+            pass
         if self.protocol != Schemes.LOCAL:
             return
 
@@ -974,7 +1016,7 @@ class Output:
             odb,
             from_info,
             from_fs,
-            "md5",
+            DEFAULT_ALGORITHM,
             upload=upload,
             no_progress_bar=no_progress_bar,
         )
@@ -1008,7 +1050,7 @@ class Output:
         if self.exists:
             self.cache.unprotect(self.fs_path)
 
-    def get_dir_cache(self, **kwargs):
+    def get_dir_cache(self, **kwargs) -> Optional["Tree"]:
         if not self.is_dir_checksum:
             raise DvcException("cannot get dir cache for file checksum")
 
@@ -1022,14 +1064,17 @@ class Output:
                 self.repo.cloud.pull([obj.hash_info], **kwargs)
 
         if self.obj:
+            assert isinstance(self.obj, Tree)
             return self.obj
 
         try:
-            self.obj = oload(self.cache, self.hash_info)
+            obj = oload(self.cache, self.hash_info)
+            assert isinstance(obj, Tree)
         except (FileNotFoundError, ObjectFormatError):
-            self.obj = None
+            obj = None
 
-        return self.obj
+        self.obj = obj
+        return obj
 
     def _collect_used_dir_cache(
         self, remote=None, force=False, jobs=None, filter_info=None
@@ -1112,7 +1157,9 @@ class Output:
             return {}
 
         if self.remote:
-            remote = self.repo.cloud.get_remote_odb(name=self.remote)
+            remote = self.repo.cloud.get_remote_odb(
+                name=self.remote, hash_name=self.hash_name
+            )
         else:
             remote = None
 
@@ -1151,13 +1198,14 @@ class Output:
             self.hash_name,
             Meta.PARAM_SIZE,
             Meta.PARAM_NFILES,
+            Output.PARAM_HASH,
         ]
 
         for opt in ignored:
             my.pop(opt, None)
             other.pop(opt, None)
 
-        if my != other:
+        if my != other or self.hash_name != out.hash_name:
             raise MergeError("unable to auto-merge outputs with different options")
 
         if not out.is_dir_checksum:
@@ -1165,7 +1213,7 @@ class Output:
 
     def merge(self, ancestor, other, allowed=None):
         from dvc_data.hashfile.tree import MergeError as TreeMergeError
-        from dvc_data.hashfile.tree import du, merge
+        from dvc_data.hashfile.tree import merge
 
         assert other
 
@@ -1198,6 +1246,168 @@ class Output:
             nfiles=len(merged),
         )
 
+    def unstage(self, path: str) -> Tuple["Meta", "Tree"]:
+        from pygtrie import Trie
+
+        from dvc_objects.fs.path import Path
+
+        assert isinstance(self.fs.path, Path)
+        rel_key = tuple(self.fs.path.parts(self.fs.path.relpath(path, self.fs_path)))
+
+        if self.hash_info:
+            tree = self.get_dir_cache()
+            if tree is None:
+                raise DvcException(f"could not read {self.hash_info.value!r}")
+        else:
+            tree = Tree()
+
+        trie = tree.as_trie()
+        assert isinstance(trie, Trie)
+
+        try:
+            del trie[rel_key:]  # type: ignore[misc]
+        except KeyError:
+            raise FileNotFoundError(  # noqa: B904
+                errno.ENOENT,
+                os.strerror(errno.ENOENT),
+                self.fs.path.relpath(path),
+            )
+
+        new = tree.from_trie(trie)
+        new.digest()
+        return Meta(nfiles=len(new), isdir=True), new
+
+    def apply(
+        self,
+        path: str,
+        obj: Union["Tree", "HashFile"],
+        meta: "Meta",
+    ) -> Tuple["Meta", "Tree"]:
+        from pygtrie import Trie
+
+        from dvc_objects.fs.path import Path
+
+        assert isinstance(self.fs.path, Path)
+        append_only = True
+        rel_key = tuple(self.fs.path.parts(self.fs.path.relpath(path, self.fs_path)))
+
+        if self.hash_info:
+            tree = self.get_dir_cache()
+            if tree is None:
+                raise DvcException(f"could not read {self.hash_info.value!r}")
+        else:
+            tree = Tree()
+
+        trie = tree.as_trie()
+        assert isinstance(trie, Trie)
+
+        try:
+            del trie[rel_key:]  # type: ignore[misc]
+        except KeyError:
+            pass
+        else:
+            append_only = False
+
+        items = {}
+        if isinstance(obj, Tree):
+            items = {(*rel_key, *key): (m, o) for key, m, o in obj}
+        else:
+            items = {rel_key: (meta, obj.hash_info)}
+        trie.update(items)
+
+        new = Tree.from_trie(trie)
+        new.digest()
+
+        size = self.meta.size if self.meta and self.meta.size else None
+        if append_only and size and meta.size is not None:
+            # if files were only appended, we can sum to the existing size
+            size += meta.size
+        elif self.hash_info and self.hash_info == new.hash_info:
+            # if hashes are same, sizes must have been the same
+            size = self.meta.size
+        else:
+            size = None
+
+        meta = Meta(nfiles=len(new), size=size, isdir=True)
+        return meta, new
+
+    def add(  # noqa: C901
+        self, path: Optional[str] = None, no_commit: bool = False, relink: bool = True
+    ) -> Optional["HashFile"]:
+        path = path or self.fs_path
+        if self.hash_info and not self.is_dir_checksum and self.fs_path != path:
+            raise DvcException(
+                f"Cannot modify '{self}' which is being tracked as a file"
+            )
+
+        assert self.repo
+        self._update_legacy_hash_name()
+        cache = self.cache if self.use_cache else self.local_cache
+        assert isinstance(cache, HashFileDB)
+
+        new: "HashFile"
+        try:
+            assert self.hash_name
+            staging, meta, obj = build(
+                cache,
+                path,
+                self.fs,
+                self.hash_name,
+                ignore=self.dvcignore,
+                dry_run=not self.use_cache,
+            )
+        except FileNotFoundError as exc:
+            if self.fs_path == path:
+                raise self.DoesNotExistError(self) from exc
+            if not self.is_dir_checksum:
+                raise
+
+            meta, new = self.unstage(path)
+            staging, obj = None, None
+        else:
+            assert obj
+            assert staging
+            if self.fs_path != path:
+                meta, new = self.apply(path, obj, meta)
+                add_update_tree(staging, new)
+            else:
+                new = obj
+
+        self.obj = new
+        self.hash_info = self.obj.hash_info
+        self.meta = meta
+        self.files = None
+        self.ignore()
+
+        if no_commit or not self.use_cache:
+            return obj
+
+        if isinstance(new, Tree):
+            add_update_tree(cache, new)
+
+        if not obj:
+            return obj
+
+        assert staging
+        assert obj.hash_info
+        otransfer(staging, self.cache, {obj.hash_info}, hardlink=relink, shallow=False)
+
+        if relink:
+            rel = self.fs.path.relpath(path)
+            with CheckoutCallback(desc=f"Checking out {rel}", unit="files") as callback:
+                self._checkout(
+                    path,
+                    self.fs,
+                    obj,
+                    self.cache,
+                    relink=True,
+                    state=self.repo.state,
+                    prompt=prompt.confirm,
+                    progress_callback=callback,
+                )
+            self.set_exec()
+        return obj
+
     @property
     def fspath(self):
         return self.fs_path
@@ -1257,10 +1467,9 @@ ARTIFACT_SCHEMA = {
     **CHECKSUMS_SCHEMA,
     **META_SCHEMA,
     Required(Output.PARAM_PATH): str,
-    Output.PARAM_PLOT: bool,
     Output.PARAM_PERSIST: bool,
-    Output.PARAM_CHECKPOINT: bool,
     Output.PARAM_CLOUD: CLOUD_SCHEMA,
+    Output.PARAM_HASH: str,
 }
 
 DIR_FILES_SCHEMA: Dict[str, Any] = {
@@ -1274,7 +1483,6 @@ SCHEMA = {
     **ARTIFACT_SCHEMA,
     **ANNOTATION_SCHEMA,
     Output.PARAM_CACHE: bool,
-    Output.PARAM_METRIC: Output.METRIC_SCHEMA,
     Output.PARAM_REMOTE: str,
     Output.PARAM_PUSH: bool,
     Output.PARAM_FILES: [DIR_FILES_SCHEMA],

dvc/parsing/versions.py

@@ -1,39 +0,0 @@
-import enum
-from collections.abc import Mapping
-
-from voluptuous import validators
-
-SCHEMA_KWD = "schema"
-META_KWD = "meta"
-
-
-def lockfile_version_schema(value):
-    expected = [LOCKFILE_VERSION.V2.value]  # pylint: disable=no-member
-    msg = f"invalid schema version {value}, expected one of {expected}"
-    return validators.Any(*expected, msg=msg)(value)
-
-
-class VersionEnum(str, enum.Enum):
-    @classmethod
-    def all_versions(cls):
-        return [v.value for v in cls]
-
-
-class LOCKFILE_VERSION(VersionEnum):  # noqa: N801
-    V1 = "1.0"
-    V2 = "2.0"
-
-    @classmethod
-    def from_dict(cls, data):
-        # 1) if it's empty or or is not a dict, use the latest one (V2).
-        # 2) use the `schema` identifier if it exists and is a supported
-        # version
-        # 3) if it's not in any of the supported version, use the latest one
-        # 4) if there's no identifier, it's a V1
-        if not data or not isinstance(data, Mapping):
-            return cls(cls.V2)
-
-        version = data.get(SCHEMA_KWD)
-        if version:
-            return cls(version if version in cls.all_versions() else cls.V2)
-        return cls(cls.V1)

dvc/progress.py

@@ -2,12 +2,16 @@
 import logging
 import sys
 from threading import RLock
+from typing import TYPE_CHECKING
 
 from tqdm import tqdm
 
 from dvc.env import DVC_IGNORE_ISATTY
 from dvc.utils import env2bool
 
+if TYPE_CHECKING:
+    from dvc.fs.callbacks import TqdmCallback
+
 logger = logging.getLogger(__name__)
 tqdm.set_lock(RLock())
 
@@ -158,3 +162,8 @@ class Tqdm(tqdm):
             d["ncols_desc"] = d["ncols_info"] = 1
             d["prefix"] = ""
         return d
+
+    def as_callback(self) -> "TqdmCallback":
+        from dvc.fs.callbacks import TqdmCallback
+
+        return TqdmCallback(progress_bar=self)

dvc/repo/__init__.py

@@ -8,7 +8,6 @@ from typing import (
     Callable,
     ContextManager,
     Iterable,
-    List,
     Optional,
     Tuple,
     Union,
@@ -287,18 +286,9 @@ class Repo:
 
     @staticmethod
     def open(url, *args, **kwargs):  # noqa: A003
-        if url is None:
-            url = os.getcwd()
+        from .open_repo import open_repo
 
-        if os.path.exists(url):
-            try:
-                return Repo(url, *args, **kwargs)
-            except NotDvcRepoError:
-                pass  # fallthrough to external_repo
-
-        from dvc.external_repo import external_repo
-
-        return external_repo(url, *args, **kwargs)
+        return open_repo(url, *args, **kwargs)
 
     @cached_property
     def scm(self) -> Union["Git", "NoSCM"]:
@@ -377,6 +367,14 @@ class Repo:
 
         return self._data_index
 
+    def drop_data_index(self) -> None:
+        try:
+            self.data_index.delete_node(("tree",))
+        except KeyError:
+            pass
+        self.data_index.commit()
+        self._reset()
+
     def __repr__(self):
         return f"{self.__class__.__name__}: '{self.root_dir}'"
 
@@ -430,8 +428,8 @@ class Repo:
         flist = [self.config.files["local"]]
         if tmp_dir := self.tmp_dir:
             flist.append(tmp_dir)
-        if path_isin(self.cache.repo.path, self.root_dir):
-            flist.append(self.cache.repo.path)
+        if path_isin(self.cache.legacy.path, self.root_dir):
+            flist.append(self.cache.legacy.path)
 
         for file in flist:
             self.scm_context.ignore(file)
@@ -509,12 +507,6 @@ class Repo:
 
         return used
 
-    @property
-    def stages(
-        self,
-    ) -> List["Stage"]:  # obsolete, only for backward-compatibility
-        return self.index.stages
-
     def find_outs_by_path(self, path, outs=None, recursive=False, strict=True):
         # using `outs_graph` to ensure graph checks are run
         outs = outs or self.index.outs_graph
@@ -563,12 +555,10 @@ class Repo:
         import getpass
         import hashlib
 
-        import platformdirs
-
+        from dvc.dirs import site_cache_dir
         from dvc.fs import GitFileSystem
 
-        default = platformdirs.site_cache_dir("dvc", "iterative", opinion=True)
-        cache_dir = self.config["core"].get("site_cache_dir") or default
+        cache_dir = self.config["core"].get("site_cache_dir") or site_cache_dir()
 
         if isinstance(self.fs, GitFileSystem):
             relparts = ()

dvc/repo/add.py

@@ -1,96 +1,120 @@
-import logging
 import os
 from contextlib import contextmanager
-from itertools import tee
-from typing import TYPE_CHECKING, Any, Iterator, List, Optional
-
-import colorama
+from typing import (
+    TYPE_CHECKING,
+    Dict,
+    Iterator,
+    List,
+    NamedTuple,
+    Optional,
+    Tuple,
+    Union,
+)
 
 from dvc.exceptions import (
     CacheLinkError,
-    InvalidArgumentError,
+    DvcException,
     OutputDuplicationError,
+    OutputNotFoundError,
     OverlappingOutputPathsError,
-    RecursiveAddingWhileUsingFilename,
 )
 from dvc.repo.scm_context import scm_context
 from dvc.ui import ui
-from dvc.utils import LARGE_DIR_SIZE, glob_targets, resolve_output, resolve_paths
-from dvc.utils.collections import ensure_list, validate
+from dvc.utils import glob_targets, resolve_output, resolve_paths
 
 from . import locked
 
 if TYPE_CHECKING:
     from dvc.repo import Repo
     from dvc.stage import Stage
-    from dvc.types import TargetType
-
-Stages = List["Stage"]
-logger = logging.getLogger(__name__)
+    from dvc.types import StrOrBytesPath
 
 
-OVERLAPPING_OUTPUT_FMT = (
+class StageInfo(NamedTuple):
+    stage: "Stage"
+    output_exists: bool
+
+
+def find_targets(
+    targets: Union["StrOrBytesPath", Iterator["StrOrBytesPath"]], glob: bool = False
+) -> List[str]:
+    if isinstance(targets, (str, bytes, os.PathLike)):
+        targets_list = [os.fsdecode(targets)]
+    else:
+        targets_list = [os.fsdecode(target) for target in targets]
+    return glob_targets(targets_list, glob=glob)
+
+
+PIPELINE_TRACKED_UPDATE_FMT = (
+    "cannot update {out!r}: overlaps with an output of {stage} in '{path}'.\n"
+    "Run the pipeline or use 'dvc commit' to force update it."
+)
+
+
+def get_or_create_stage(
+    repo: "Repo",
+    target: str,
+    out: Optional[str] = None,
+    to_remote: bool = False,
+    force: bool = False,
+) -> StageInfo:
+    if out:
+        target = resolve_output(target, out, force=force)
+    path, wdir, out = resolve_paths(repo, target, always_local=to_remote and not out)
+
+    try:
+        (out_obj,) = repo.find_outs_by_path(target, strict=False)
+        stage = out_obj.stage
+        if not stage.is_data_source:
+            msg = PIPELINE_TRACKED_UPDATE_FMT.format(
+                out=out, stage=stage, path=stage.relpath
+            )
+            raise DvcException(msg)
+        return StageInfo(stage, output_exists=True)
+    except OutputNotFoundError:
+        stage = repo.stage.create(
+            single_stage=True,
+            validate=False,
+            fname=path,
+            wdir=wdir,
+            outs=[out],
+            force=force,
+        )
+        return StageInfo(stage, output_exists=False)
+
+
+OVERLAPPING_CHILD_FMT = (
     "Cannot add '{out}', because it is overlapping with other "
     "DVC tracked output: '{parent}'.\n"
     "To include '{out}' in '{parent}', run "
     "'dvc commit {parent_stage}'"
 )
 
-
-def check_recursive_and_fname(args):
-    if args.recursive and args.fname:
-        raise RecursiveAddingWhileUsingFilename()
-
-
-def transform_targets(args):
-    from funcy import count_reps
-
-    counts = count_reps(ensure_list(args.targets))
-    dupes = [key for key, count in counts.items() if count > 1]
-    if dupes:
-        msg = ", ".join(f"[b]{key}[/]" for key in dupes)
-        ui.error_write(f"ignoring duplicated targets: {msg}", styled=True)
-    args.targets = list(counts)
-
-
-def check_arg_combinations(args):
-    kwargs = args.kwargs
-    invalid_opt = None
-    to_remote = args.to_remote
-    to_cache = kwargs.get("out") and not to_remote
-
-    if to_remote or to_cache:
-        message = "{option} can't be used with "
-        message += "--to-remote" if to_remote else "-o"
-        if len(args.targets) != 1:
-            invalid_opt = "multiple targets"
-        elif args.no_commit:
-            invalid_opt = "--no-commit option"
-        elif args.recursive:
-            invalid_opt = "--recursive option"
-        elif kwargs.get("external"):
-            invalid_opt = "--external option"
-    else:
-        message = "{option} can't be used without --to-remote"
-        if kwargs.get("remote"):
-            invalid_opt = "--remote"
-        elif kwargs.get("jobs"):
-            invalid_opt = "--jobs"
-
-    if invalid_opt is not None:
-        raise InvalidArgumentError(message.format(option=invalid_opt))
+OVERLAPPING_PARENT_FMT = (
+    "Cannot add '{parent}', because it is overlapping with other "
+    "DVC tracked output: '{out}'.\n"
+    "To include '{out}' in '{parent}', run "
+    "'dvc remove {out_stage}' and then 'dvc add {parent}'"
+)
 
 
 @contextmanager
-def translate_graph_error(stages: Stages) -> Iterator[None]:
+def translate_graph_error(stages: List["Stage"]) -> Iterator[None]:
     try:
         yield
     except OverlappingOutputPathsError as exc:
-        msg = OVERLAPPING_OUTPUT_FMT.format(
-            out=exc.overlapping_out.fs_path,
-            parent=exc.parent.fs_path,
-            parent_stage=exc.parent.stage.addressing,
-        )
+        if exc.parent in [o for s in stages for o in s.outs]:
+            msg = OVERLAPPING_PARENT_FMT.format(
+                out=exc.overlapping_out,
+                parent=exc.parent,
+                out_stage=exc.overlapping_out.stage.addressing,
+            )
+        else:
+            msg = OVERLAPPING_CHILD_FMT.format(
+                out=exc.overlapping_out,
+                parent=exc.parent,
+                parent_stage=exc.parent.stage.addressing,
+            )
         raise OverlappingOutputPathsError(  # noqa: B904
             exc.parent, exc.overlapping_out, msg
         )
@@ -100,18 +124,21 @@ def translate_graph_error(stages: Stages) -> Iterator[None]:
         )
 
 
-def progress_iter(stages: Stages) -> Iterator["Stage"]:
+def progress_iter(stages: Dict[str, StageInfo]) -> Iterator[Tuple[str, StageInfo]]:
     total = len(stages)
     desc = "Adding..."
-    with ui.progress(stages, total=total, desc=desc, unit="file", leave=True) as pbar:
+    with ui.progress(
+        stages.items(), total=total, desc=desc, unit="file", leave=True
+    ) as pbar:
         if total == 1:
             pbar.bar_format = desc
             pbar.refresh()
 
-        for stage in pbar:
+        for item, stage_info in pbar:
             if total > 1:
-                pbar.set_msg(f"{stage.outs[0]}")
-            yield stage
+                pbar.set_msg(str(stage_info.stage.outs[0]))
+                pbar.refresh()
+            yield item, stage_info
             if total == 1:  # restore bar format for stats
                 # pylint: disable=no-member
                 pbar.bar_format = pbar.BAR_FMT_DEFAULT
@@ -138,133 +165,75 @@ def warn_link_failures() -> Iterator[List[str]]:
             ui.error_write(msg)
 
 
-VALIDATORS = (
-    check_recursive_and_fname,
-    transform_targets,
-    check_arg_combinations,
-)
+def _add_transfer(
+    stage: "Stage",
+    source: str,
+    remote: Optional[str] = None,
+    to_remote: bool = False,
+    jobs: Optional[int] = None,
+    force: bool = False,
+) -> None:
+    odb = None
+    if to_remote:
+        odb = stage.repo.cloud.get_remote_odb(remote, "add")
+    stage.transfer(source, odb=odb, to_remote=to_remote, jobs=jobs, force=force)
+    stage.dump()
+
+
+def _add(stage: "Stage", source: Optional[str] = None, no_commit: bool = False) -> None:
+    out = stage.outs[0]
+    path = out.fs.path.abspath(source) if source else None
+    try:
+        stage.add_outs(path, no_commit=no_commit)
+    except CacheLinkError:
+        stage.dump()
+        raise
+    stage.dump()
 
 
-@validate(*VALIDATORS)
 @locked
 @scm_context
 def add(
     repo: "Repo",
-    targets: "TargetType",
-    recursive: bool = False,
+    targets: Union["StrOrBytesPath", Iterator["StrOrBytesPath"]],
     no_commit: bool = False,
-    fname: Optional[str] = None,
+    glob: bool = False,
+    out: Optional[str] = None,
+    remote: Optional[str] = None,
     to_remote: bool = False,
-    **kwargs: Any,
-):
-    to_cache = bool(kwargs.get("out")) and not to_remote
-    transfer = to_remote or to_cache
+    remote_jobs: Optional[int] = None,
+    force: bool = False,
+) -> List["Stage"]:
+    add_targets = find_targets(targets, glob=glob)
+    if not add_targets:
+        return []
 
-    glob = kwargs.get("glob", False)
-    add_targets = collect_targets(repo, targets, recursive, glob)
-    # pass one for creating stages, other one is used for iterating here
-    add_targets, sources = tee(add_targets)
-
-    # collect targets and build stages as we go
-    desc = "Collecting targets"
-    stages_it = create_stages(repo, add_targets, fname, transfer, **kwargs)
-    stages = list(ui.progress(stages_it, desc=desc, unit="file"))
-    msg = "Collecting stages from the workspace"
-    with translate_graph_error(stages), ui.status(msg) as status:
-        # remove existing stages that are to-be replaced with these
-        # new stages for the graph checks.
-        repo.check_graph(
-            stages=stages, callback=lambda: status.update("Checking graph")
+    stages_with_targets = {
+        target: get_or_create_stage(
+            repo,
+            target,
+            out=out,
+            to_remote=to_remote,
+            force=force,
         )
+        for target in add_targets
+    }
 
-    odb = None
-    if to_remote:
-        odb = repo.cloud.get_remote_odb(kwargs.get("remote"), "add")
+    stages = [stage for stage, _ in stages_with_targets.values()]
+    msg = "Collecting stages from the workspace"
+    with translate_graph_error(stages), ui.status(msg) as st:
+        repo.check_graph(stages=stages, callback=lambda: st.update("Checking graph"))
+
+    if to_remote or out:
+        assert len(stages_with_targets) == 1, "multiple targets are unsupported"
+        (source, (stage, _)) = next(iter(stages_with_targets.items()))
+        _add_transfer(stage, source, remote, to_remote, jobs=remote_jobs, force=force)
+        return [stage]
 
     with warn_link_failures() as link_failures:
-        for stage, source in zip(progress_iter(stages), sources):
-            if to_remote or to_cache:
-                stage.transfer(source, to_remote=to_remote, odb=odb, **kwargs)
-            else:
-                try:
-                    stage.save()
-                    if not no_commit:
-                        stage.commit()
-                except CacheLinkError:
-                    link_failures.append(str(stage.relpath))
-            stage.dump()
+        for source, (stage, output_exists) in progress_iter(stages_with_targets):
+            try:
+                _add(stage, source if output_exists else None, no_commit=no_commit)
+            except CacheLinkError:
+                link_failures.append(stage.relpath)
     return stages
-
-
-LARGE_DIR_RECURSIVE_ADD_WARNING = (
-    "You are adding a large directory '{target}' recursively.\n"
-    "Consider tracking it as a whole instead with "
-    "`{cyan}dvc add {target}{nc}`."
-)
-
-
-def collect_targets(
-    repo: "Repo",
-    targets: "TargetType",
-    recursive: bool = False,
-    glob: bool = False,
-) -> Iterator[str]:
-    for target in glob_targets(ensure_list(targets), glob=glob):
-        expanded_targets = _find_all_targets(repo, target, recursive=recursive)
-        for index, path in enumerate(expanded_targets):
-            if index == LARGE_DIR_SIZE:
-                msg = LARGE_DIR_RECURSIVE_ADD_WARNING.format(
-                    cyan=colorama.Fore.CYAN,
-                    nc=colorama.Style.RESET_ALL,
-                    target=target,
-                )
-                ui.error_write(msg)
-            yield path
-
-
-def _find_all_targets(
-    repo: "Repo", target: str, recursive: bool = False
-) -> Iterator[str]:
-    from dvc.dvcfile import is_dvc_file
-
-    if os.path.isdir(target) and recursive:
-        files = repo.dvcignore.find(repo.fs, target)
-        yield from (
-            path
-            for path in files
-            if not repo.is_dvc_internal(path)
-            if not is_dvc_file(path)
-            if not repo.scm.belongs_to_scm(path)
-            if not repo.scm.is_tracked(path)
-        )
-    else:
-        yield target
-
-
-def create_stages(
-    repo: "Repo",
-    targets: Iterator[str],
-    fname: Optional[str] = None,
-    transfer: bool = False,
-    external: bool = False,
-    **kwargs: Any,
-) -> Iterator["Stage"]:
-    for target in targets:
-        if kwargs.get("out"):
-            target = resolve_output(target, kwargs["out"])
-        path, wdir, out = resolve_paths(
-            repo, target, always_local=transfer and not kwargs.get("out")
-        )
-
-        stage = repo.stage.create(
-            single_stage=True,
-            validate=False,
-            fname=fname or path,
-            wdir=wdir,
-            outs=[out],
-            external=external,
-        )
-
-        out_obj = stage.outs[0]
-        out_obj.annot.update(**kwargs)
-        yield stage

dvc/repo/artifacts.py

@@ -1,19 +1,26 @@
 import logging
-import os
 import re
-from typing import TYPE_CHECKING, Dict
+from pathlib import Path
+from typing import Dict, Optional
 
 from dvc.annotations import Artifact
-from dvc.dvcfile import FileMixin
+from dvc.dvcfile import PROJECT_FILE
+from dvc.exceptions import InvalidArgumentError
+from dvc.repo import Repo
 from dvc.utils import relpath
-
-if TYPE_CHECKING:
-    from dvc.repo import Repo
+from dvc.utils.serialize import modify_yaml
 
 logger = logging.getLogger(__name__)
 
 
-NAME_RE = re.compile(r"^[a-z]([a-z0-9-]*[a-z0-9])?$")
+# Constants are taken from GTO.
+# When we make it a dependency, we can import them instead
+SEPARATOR_IN_NAME = ":"
+DIRNAME = r"[a-z0-9-_./]+"
+NAME = r"[a-z0-9]([a-z0-9-/]*[a-z0-9])?"
+NAME_RE = re.compile(f"^{NAME}$")
+FULLNAME = f"((?P<dirname>{DIRNAME}){SEPARATOR_IN_NAME})?(?P<name>{NAME})"
+FULLNAME_RE = re.compile(f"^{FULLNAME}$")
 
 
 def name_is_compatible(name: str) -> bool:
@@ -22,22 +29,23 @@ def name_is_compatible(name: str) -> bool:
 
 def check_name_format(name: str) -> None:
     if not name_is_compatible(name):
-        logger.warning(
-            "Can't use '%s' as artifact name (ID)."
+        raise InvalidArgumentError(
+            f"Can't use '{name}' as artifact name (ID)."
             " You can use letters and numbers, and use '-' as separator"
-            " (but not at the start or end). The first character must be a letter.",
-            name,
+            " (but not at the start or end)."
         )
 
 
-class ArtifactsFile(FileMixin):
-    from dvc.schema import SINGLE_ARTIFACT_SCHEMA as SCHEMA
-
-    def dump(self, stage, **kwargs):
-        raise NotImplementedError
-
-    def merge(self, ancestor, other, allowed=None):
-        raise NotImplementedError
+def check_for_nested_dvc_repo(dvcfile: Path):
+    if dvcfile.is_absolute():
+        raise InvalidArgumentError("Use relative path to dvc.yaml.")
+    path = dvcfile.parent
+    while path.name:
+        if (path / Repo.DVC_DIR).is_dir():
+            raise InvalidArgumentError(
+                f"Nested DVC repos like {path} are not supported."
+            )
+        path = path.parent
 
 
 class Artifacts:
@@ -50,18 +58,30 @@ class Artifacts:
             dvcfile,
             dvcfile_artifacts,
         ) in self.repo.index._artifacts.items():  # pylint: disable=protected-access
-            # read the artifacts.yaml file if needed
-            if isinstance(dvcfile_artifacts, str):
-                dvcfile_artifacts = ArtifactsFile(
-                    self.repo,
-                    os.path.join(os.path.dirname(dvcfile), dvcfile_artifacts),
-                    verify=False,
-                ).load()
-            if not dvcfile_artifacts:
-                continue
             dvcyaml = relpath(dvcfile, self.repo.root_dir)
             artifacts[dvcyaml] = {}
             for name, value in dvcfile_artifacts.items():
-                check_name_format(name)
+                try:
+                    check_name_format(name)
+                except InvalidArgumentError as e:
+                    logger.warning(e.msg)
                 artifacts[dvcyaml][name] = Artifact(**value)
         return artifacts
+
+    def add(self, name: str, artifact: Artifact, dvcfile: Optional[str] = None):
+        with self.repo.scm_context(quiet=True):
+            check_name_format(name)
+            dvcyaml = Path(dvcfile or PROJECT_FILE)
+            check_for_nested_dvc_repo(
+                dvcyaml.relative_to(self.repo.root_dir)
+                if dvcyaml.is_absolute()
+                else dvcyaml
+            )
+
+            with modify_yaml(dvcyaml) as data:
+                artifacts = data.setdefault("artifacts", {})
+                artifacts.update({name: artifact.to_dict()})
+
+            self.repo.scm_context.track_file(dvcfile)
+
+        return artifacts.get(name)

dvc/repo/checkout.py

@@ -1,15 +1,21 @@
 import logging
 import os
-from typing import TYPE_CHECKING, Dict, List, Set
+from typing import TYPE_CHECKING, Dict, List
 
-from dvc.exceptions import CheckoutError, CheckoutErrorSuggestGit, NoOutputOrStageError
+from dvc.exceptions import (
+    CheckoutError,
+    CheckoutErrorSuggestGit,
+    DvcException,
+    NoOutputOrStageError,
+)
+from dvc.ui import ui
 from dvc.utils import relpath
 
 from . import locked
 
 if TYPE_CHECKING:
-    from . import Repo
-    from .stage import StageInfo
+    from dvc_data.index import BaseDataIndex, DataIndexEntry
+    from dvc_objects.fs.base import FileSystem
 
 logger = logging.getLogger(__name__)
 
@@ -30,37 +36,68 @@ def _remove_unused_links(repo):
     return ret
 
 
-def get_all_files_numbers(pairs):
-    return sum(stage.get_all_files_number(filter_info) for stage, filter_info in pairs)
+def _build_out_changes(index, changes):
+    from dvc_data.index.checkout import MODIFY
+
+    out_keys = []
+    for out in index.outs:
+        if not out.use_cache:
+            continue
+
+        ws, key = out.index_key
+        if ws != "repo":
+            continue
+
+        out_keys.append(key)
+
+    out_changes = {}
+    for objects in changes.values():
+        for change in objects:
+            for out_key in out_keys:
+                if (
+                    len(out_key) > len(change.key)
+                    or change.key[: len(out_key)] != out_key
+                ):
+                    continue
+
+                if change.key == out_key:
+                    out_changes[out_key] = change.typ
+                elif not out_changes.get(out_key):
+                    out_changes[out_key] = MODIFY
+                break
+
+    return out_changes
 
 
-def _collect_pairs(
-    self: "Repo", targets, with_deps: bool, recursive: bool
-) -> Set["StageInfo"]:
-    from dvc.stage.exceptions import StageFileBadNameError, StageFileDoesNotExistError
-
-    pairs: Set["StageInfo"] = set()
-    for target in targets:
+def _check_can_delete(
+    entries: List["DataIndexEntry"],
+    index: "BaseDataIndex",
+    path: str,
+    fs: "FileSystem",
+):
+    entry_paths = []
+    for entry in entries:
         try:
-            pairs.update(
-                self.stage.collect_granular(
-                    target, with_deps=with_deps, recursive=recursive
-                )
-            )
-        except (
-            StageFileDoesNotExistError,
-            StageFileBadNameError,
-            NoOutputOrStageError,
-        ) as exc:
-            if not target:
-                raise
-            raise CheckoutErrorSuggestGit(target) from exc
+            cache_fs, cache_path = index.storage_map.get_cache(entry)
+        except ValueError:
+            continue
 
-    return pairs
+        if cache_fs.exists(cache_path):
+            continue
+
+        entry_paths.append(fs.path.join(path, *entry.key))
+
+    if not entry_paths:
+        return
+
+    raise DvcException(
+        "Can't remove the following unsaved files without confirmation. "
+        "Use `--force` to force.\n" + "\n".join(entry_paths)
+    )
 
 
 @locked
-def checkout(
+def checkout(  # noqa: C901
     self,
     targets=None,
     with_deps=False,
@@ -70,13 +107,14 @@ def checkout(
     allow_missing=False,
     **kwargs,
 ):
-    from dvc.fs.callbacks import Callback
+    from dvc.repo.index import build_data_index
+    from dvc.stage.exceptions import StageFileBadNameError, StageFileDoesNotExistError
+    from dvc_data.index.checkout import ADD, DELETE, MODIFY, apply, compare
 
     stats: Dict[str, List[str]] = {
         "added": [],
         "deleted": [],
         "modified": [],
-        "failed": [],
     }
     if not targets:
         targets = [None]
@@ -85,28 +123,88 @@ def checkout(
     if isinstance(targets, str):
         targets = [targets]
 
-    pairs = _collect_pairs(self, targets, with_deps, recursive)
-    total = get_all_files_numbers(pairs)
-    with Callback.as_tqdm_callback(
+    def onerror(target, exc):
+        if target and isinstance(
+            exc,
+            (
+                StageFileDoesNotExistError,
+                StageFileBadNameError,
+                NoOutputOrStageError,
+            ),
+        ):
+            raise CheckoutErrorSuggestGit(target) from exc
+        raise  # pylint: disable=misplaced-bare-raise
+
+    view = self.index.targets_view(
+        targets,
+        recursive=recursive,
+        with_deps=with_deps,
+        onerror=onerror,
+    )
+
+    with ui.progress(
+        unit="entry",
+        desc="Building data index",
+    ) as pb:
+        old = build_data_index(
+            view,
+            self.root_dir,
+            self.fs,
+            compute_hash=True,
+            callback=pb.as_callback(),
+        )
+
+    new = view.data["repo"]
+
+    with ui.progress(
+        desc="Comparing indexes",
+        unit="entry",
+    ) as pb:
+        diff = compare(old, new, relink=relink, delete=True, callback=pb.as_callback())
+
+    if not force:
+        _check_can_delete(diff.files_delete, new, self.root_dir, self.fs)
+
+    failed = set()
+    out_paths = [out.fs_path for out in view.outs if out.use_cache and out.is_in_repo]
+
+    def checkout_onerror(src_path, dest_path, _exc):
+        logger.debug(
+            "failed to create '%s' from '%s'", dest_path, src_path, exc_info=True
+        )
+
+        for out_path in out_paths:
+            if self.fs.path.isin_or_eq(dest_path, out_path):
+                failed.add(out_path)
+
+    with ui.progress(
         unit="file",
         desc="Checkout",
-        disable=total == 0,
-    ) as cb:
-        cb.set_size(total)
-        for stage, filter_info in pairs:
-            result = stage.checkout(
-                force=force,
-                progress_callback=cb,
-                relink=relink,
-                filter_info=filter_info,
-                allow_missing=allow_missing,
-                **kwargs,
-            )
-            for key, items in result.items():
-                stats[key].extend(_fspath_dir(path) for path in items)
+    ) as pb:
+        apply(
+            diff,
+            self.root_dir,
+            self.fs,
+            callback=pb.as_callback(),
+            update_meta=False,
+            onerror=checkout_onerror,
+            state=self.state,
+            **kwargs,
+        )
 
-    if stats.get("failed"):
-        raise CheckoutError(stats["failed"], stats)
+    out_changes = _build_out_changes(view, diff.changes)
+
+    typ_map = {ADD: "added", DELETE: "deleted", MODIFY: "modified"}
+    for key, typ in out_changes.items():
+        out_path = self.fs.path.join(self.root_dir, *key)
+
+        if out_path in failed:
+            self.fs.remove(out_path, recursive=True)
+        else:
+            self.state.save_link(out_path, self.fs)
+            stats[typ_map[typ]].append(_fspath_dir(out_path))
+
+    if failed and not allow_missing:
+        raise CheckoutError([relpath(out_path) for out_path in failed], stats)
 
-    del stats["failed"]
     return stats

dvc/repo/commit.py

@@ -37,7 +37,7 @@ def prompt_to_commit(stage, changes, force=False):
 @locked
 def commit(
     self,
-    target,
+    target=None,
     with_deps=False,
     recursive=False,
     force=False,

dvc/repo/data.py

@@ -1,21 +1,12 @@
 import os
 import posixpath
-from itertools import chain
-from typing import (
-    TYPE_CHECKING,
-    Any,
-    Dict,
-    Iterable,
-    Iterator,
-    List,
-    Optional,
-    TypedDict,
-    Union,
-)
+from typing import TYPE_CHECKING, Any, Dict, Iterable, List, TypedDict, Union
 
+from dvc.fs.callbacks import DEFAULT_CALLBACK
 from dvc.ui import ui
 
 if TYPE_CHECKING:
+    from dvc.fs.callbacks import Callback
     from dvc.repo import Repo
     from dvc.scm import Git, NoSCM
     from dvc_data.index import DataIndex
@@ -61,6 +52,7 @@ def _diff(
     not_in_cache: bool = False,
     not_in_remote: bool = False,
     remote_refresh: bool = False,
+    callback: "Callback" = DEFAULT_CALLBACK,
 ) -> Dict[str, List[str]]:
     from dvc_data.index import StorageError
     from dvc_data.index.diff import UNCHANGED, UNKNOWN, diff
@@ -81,13 +73,12 @@ def _diff(
         shallow=not granular,
         hash_only=True,
         with_unknown=True,
+        callback=callback,
     ):
         if (
             change.typ == UNCHANGED
-            and change.old
-            and change.new
-            and not change.old.hash_info
-            and not change.new.hash_info
+            and (not change.old or not change.old.hash_info)
+            and (not change.new or not change.new.hash_info)
         ):
             # NOTE: emulating previous behaviour
             continue
@@ -162,17 +153,27 @@ def _git_info(scm: Union["Git", "NoSCM"], untracked_files: str = "all") -> GitIn
 def _diff_index_to_wtree(repo: "Repo", **kwargs: Any) -> Dict[str, List[str]]:
     from .index import build_data_index
 
-    with ui.status("Building workspace index"):
+    with ui.progress(
+        desc="Building workspace index",
+        unit="entry",
+    ) as pb:
         workspace = build_data_index(
-            repo.index, repo.root_dir, repo.fs, compute_hash=True
+            repo.index,
+            repo.root_dir,
+            repo.fs,
+            compute_hash=True,
+            callback=pb.as_callback(),
         )
 
-    with ui.status("Calculating diff between index/workspace"):
+    with ui.progress(
+        desc="Calculating diff between index/workspace",
+        unit="entry",
+    ) as pb:
         return _diff(
             repo.index.data["repo"],
             workspace,
             not_in_cache=True,
-            not_in_remote=True,
+            callback=pb.as_callback(),
             **kwargs,
         )
 
@@ -185,8 +186,11 @@ def _diff_head_to_index(
     with repo.switch(head):
         head_index = repo.index.data["repo"]
 
-    with ui.status("Calculating diff between head/index"):
-        return _diff(head_index, index, **kwargs)
+    with ui.progress(
+        desc="Calculating diff between head/index",
+        unit="entry",
+    ) as pb:
+        return _diff(head_index, index, callback=pb.as_callback(), **kwargs)
 
 
 class Status(TypedDict):
@@ -252,17 +256,3 @@ def status(
         unchanged=list(unchanged),
         git=git_info,
     )
-
-
-def ls(
-    repo: "Repo",
-    targets: Optional[List[Optional[str]]] = None,
-    recursive: bool = False,
-) -> Iterator[Dict[str, Any]]:
-    targets = targets or [None]
-    pairs = chain.from_iterable(
-        repo.stage.collect_granular(target, recursive=recursive) for target in targets
-    )
-    for stage, filter_info in pairs:
-        for out in stage.filter_outs(filter_info):
-            yield {"path": str(out), **out.annot.to_dict()}

dvc/repo/diff.py

@@ -156,8 +156,13 @@ def diff(
         for target in old_missing & new_missing:
             raise FileNotFoundError(errno.ENOENT, os.strerror(errno.ENOENT), target)
 
-    old = indexes[a_rev]
-    new = indexes[b_rev]
+    if len(indexes.keys()) == 1:
+        # both a_rev and b_rev point to the same sha, nothing to compare
+        old = None
+        new = None
+    else:
+        old = indexes[a_rev]
+        new = indexes[b_rev]
 
     with ui.status("Calculating diff"):
         return _diff(old, new, with_missing=with_missing)

dvc/repo/experiments/__init__.py

@@ -5,7 +5,6 @@ from typing import TYPE_CHECKING, Dict, Iterable, List, Optional
 
 from funcy import chain, first
 
-from dvc.exceptions import DvcException
 from dvc.ui import ui
 from dvc.utils import relpath
 from dvc.utils.objects import cached_property
@@ -22,7 +21,6 @@ from .refs import (
     CELERY_FAILED_STASH,
     CELERY_STASH,
     EXEC_APPLY,
-    EXEC_CHECKPOINT,
     EXEC_NAMESPACE,
     EXPS_NAMESPACE,
     WORKSPACE_STASH,
@@ -48,10 +46,7 @@ class Experiments:
         repo (dvc.repo.Repo): repo instance that these experiments belong to.
     """
 
-    BRANCH_RE = re.compile(
-        r"^(?P<baseline_rev>[a-f0-9]{7})-(?P<exp_sha>[a-f0-9]+)"
-        r"(?P<checkpoint>-checkpoint)?$"
-    )
+    BRANCH_RE = re.compile(r"^(?P<baseline_rev>[a-f0-9]{7})-(?P<exp_sha>[a-f0-9]+)")
 
     def __init__(self, repo):
         from dvc.scm import NoSCMError
@@ -119,6 +114,7 @@ class Experiments:
         self,
         tmp_dir: bool = False,
         copy_paths: Optional[List[str]] = None,
+        message: Optional[str] = None,
         **kwargs,
     ):
         """Reproduce and checkout a single (standalone) experiment."""
@@ -126,7 +122,9 @@ class Experiments:
             self.tempdir_queue if tmp_dir else self.workspace_queue
         )
         self.queue_one(exp_queue, **kwargs)
-        results = self._reproduce_queue(exp_queue, copy_paths=copy_paths)
+        results = self._reproduce_queue(
+            exp_queue, copy_paths=copy_paths, message=message
+        )
         exp_rev = first(results)
         if exp_rev is not None:
             self._log_reproduced(results, tmp_dir=tmp_dir)
@@ -135,47 +133,18 @@ class Experiments:
     def queue_one(
         self,
         queue: "BaseStashQueue",
-        checkpoint_resume: Optional[str] = None,
-        reset: bool = False,
         **kwargs,
     ) -> "QueueEntry":
         """Queue a single experiment."""
-        if reset:
-            self.reset_checkpoints()
-
         if kwargs.pop("machine", None) is not None:
             # TODO: decide how to handle queued remote execution
             raise NotImplementedError
 
-        if checkpoint_resume:
-            from dvc.scm import resolve_rev
-
-            resume_rev = resolve_rev(self.scm, checkpoint_resume)
-            try:
-                self.check_baseline(resume_rev)
-                checkpoint_resume = resume_rev
-            except BaselineMismatchError as exc:
-                raise DvcException(
-                    f"Cannot resume from '{checkpoint_resume}' as it is not "
-                    "derived from your current workspace."
-                ) from exc
-        else:
-            checkpoint_resume = self._workspace_resume_rev()
-
         return self.new(
             queue,
-            checkpoint_resume=checkpoint_resume,
-            reset=reset,
             **kwargs,
         )
 
-    def _workspace_resume_rev(self) -> Optional[str]:
-        last_checkpoint = self._get_last_checkpoint()
-        last_applied = self._get_last_applied()
-        if last_checkpoint and last_applied:
-            return last_applied
-        return None
-
     def reproduce_celery(  # noqa: C901
         self, entries: Optional[Iterable["QueueEntry"]] = None, **kwargs
     ) -> Dict[str, str]:
@@ -254,17 +223,12 @@ class Experiments:
         self,
         queue: "BaseStashQueue",
         *args,
-        checkpoint_resume: Optional[str] = None,
         **kwargs,
     ) -> "QueueEntry":
         """Create and enqueue a new experiment.
 
         Experiment will be derived from the current workspace.
         """
-        if checkpoint_resume is not None:
-            return self._resume_checkpoint(
-                queue, *args, resume_rev=checkpoint_resume, **kwargs
-            )
 
         name = kwargs.get("name", None)
         baseline_sha = kwargs.get("baseline_rev") or self.repo.scm.get_rev()
@@ -278,59 +242,6 @@ class Experiments:
 
         return queue.put(*args, **kwargs)
 
-    def _resume_checkpoint(
-        self,
-        queue: "BaseStashQueue",
-        *args,
-        resume_rev: Optional[str] = None,
-        **kwargs,
-    ) -> "QueueEntry":
-        """Create and queue a resumed checkpoint experiment."""
-        assert resume_rev
-
-        branch: Optional[str] = None
-        try:
-            allow_multiple = bool(kwargs.get("params", None))
-            branch = self.get_branch_by_rev(resume_rev, allow_multiple=allow_multiple)
-            if not branch:
-                raise DvcException(
-                    f"Could not find checkpoint experiment '{resume_rev[:7]}'"
-                )
-            baseline_rev = self._get_baseline(branch)
-        except MultipleBranchError as exc:
-            baselines = {
-                info.baseline_sha for info in exc.ref_infos if info.baseline_sha
-            }
-            if len(baselines) == 1:
-                baseline_rev = baselines.pop()
-            else:
-                raise
-
-        logger.debug(
-            "Checkpoint run from '%s' with baseline '%s'",
-            resume_rev[:7],
-            baseline_rev,
-        )
-        return queue.put(
-            *args,
-            resume_rev=resume_rev,
-            baseline_rev=baseline_rev,
-            branch=branch,
-            **kwargs,
-        )
-
-    def _get_last_checkpoint(self) -> Optional[str]:
-        try:
-            last_checkpoint = self.scm.get_ref(EXEC_CHECKPOINT)
-            if last_checkpoint:
-                self.check_baseline(last_checkpoint)
-            return last_checkpoint
-        except BaselineMismatchError:
-            # If HEAD has moved since the the last checkpoint run,
-            # the specified checkpoint is no longer relevant
-            self.scm.remove_ref(EXEC_CHECKPOINT)
-        return None
-
     def _get_last_applied(self) -> Optional[str]:
         try:
             last_applied = self.scm.get_ref(EXEC_APPLY)
@@ -343,13 +254,13 @@ class Experiments:
             self.scm.remove_ref(EXEC_APPLY)
         return None
 
-    def reset_checkpoints(self):
-        self.scm.remove_ref(EXEC_CHECKPOINT)
-        self.scm.remove_ref(EXEC_APPLY)
-
     @unlocked_repo
     def _reproduce_queue(
-        self, queue: "BaseStashQueue", copy_paths: Optional[List[str]] = None, **kwargs
+        self,
+        queue: "BaseStashQueue",
+        copy_paths: Optional[List[str]] = None,
+        message: Optional[str] = None,
+        **kwargs,
     ) -> Dict[str, str]:
         """Reproduce queued experiments.
 
@@ -360,7 +271,7 @@ class Experiments:
             dict mapping successfully reproduced experiment revs to their
             results.
         """
-        exec_results = queue.reproduce(copy_paths=copy_paths)
+        exec_results = queue.reproduce(copy_paths=copy_paths, message=message)
 
         results: Dict[str, str] = {}
         for _, exp_result in exec_results.items():
@@ -442,17 +353,6 @@ class Experiments:
             result[rev] = name
         return result
 
-    def get_running_exps(self, fetch_refs: bool = True) -> Dict[str, Dict]:
-        """Return info for running experiments."""
-        result = {}
-        for queue in (
-            self.workspace_queue,
-            self.tempdir_queue,
-            self.celery_queue,
-        ):
-            result.update(queue.get_running_exps(fetch_refs))
-        return result
-
     def apply(self, *args, **kwargs):
         from dvc.repo.experiments.apply import apply
 
@@ -483,11 +383,6 @@ class Experiments:
 
         return save(self.repo, *args, **kwargs)
 
-    def gc(self, *args, **kwargs):
-        from dvc.repo.experiments.gc import gc
-
-        return gc(self.repo, *args, **kwargs)
-
     def push(self, *args, **kwargs):
         from dvc.repo.experiments.push import push
 

dvc/repo/experiments/brancher.py

@@ -0,0 +1,47 @@
+from contextlib import ExitStack, contextmanager
+from typing import TYPE_CHECKING, Iterator, Tuple
+
+from dvc.repo.experiments.exceptions import InvalidExpRevError
+from dvc.scm import RevError
+
+if TYPE_CHECKING:
+    from dvc.repo import Repo
+
+
+@contextmanager
+def switch_repo(
+    repo: "Repo",
+    rev: str,
+) -> Iterator[Tuple["Repo", str]]:
+    """Return a repo instance (brancher) switched to rev.
+
+    If rev is the name of a running experiment, the returned instance will be
+    the live repo wherever the experiment is running.
+
+    NOTE: This will not resolve git SHA's that only exist in queued exp workspaces
+    (it will only match queued exp names).
+    """
+    try:
+        with repo.switch(rev):
+            yield repo, rev
+        return
+    except RevError as exc:
+        orig_exc = exc
+    exps = repo.experiments
+
+    if rev == exps.workspace_queue.get_running_exp():
+        yield repo, "workspace"
+        return
+
+    for queue in (exps.tempdir_queue, exps.celery_queue):
+        try:
+            active_repo = queue.active_repo(rev)
+        except InvalidExpRevError:
+            continue
+        stack = ExitStack()
+        stack.enter_context(active_repo)
+        stack.enter_context(active_repo.switch("workspace"))
+        with stack:
+            yield active_repo, rev
+        return
+    raise orig_exc

dvc/repo/experiments/collect.py

@@ -0,0 +1,382 @@
+import itertools
+import logging
+import os
+from datetime import datetime
+from typing import (
+    TYPE_CHECKING,
+    Collection,
+    Dict,
+    Iterable,
+    Iterator,
+    List,
+    Optional,
+    Tuple,
+    Union,
+)
+
+from funcy import first
+from scmrepo.exceptions import SCMError as InnerSCMError
+
+from dvc.scm import Git, SCMError, iter_revs
+
+from .exceptions import InvalidExpRefError
+from .refs import EXEC_BRANCH, ExpRefInfo
+from .serialize import ExpRange, ExpState, SerializableError, SerializableExp
+
+if TYPE_CHECKING:
+    from dvc.repo import Repo
+
+    from .cache import ExpCache
+
+logger = logging.getLogger(__name__)
+
+
+def collect_rev(
+    repo: "Repo",
+    rev: str,
+    param_deps: bool = False,
+    force: bool = False,
+    cache: Optional["ExpCache"] = None,
+    **kwargs,
+) -> ExpState:
+    """Collect experiment state for the given revision.
+
+    Exp will be loaded from cache when available unless rev is 'workspace' or
+    force is set.
+    """
+    from dvc.fs import LocalFileSystem
+
+    cache = cache or repo.experiments.cache
+    assert cache
+    # TODO: support filtering serialized exp when param_deps is set
+    if rev != "workspace" and not (force or param_deps):
+        cached_exp = cache.get(rev)
+        if cached_exp:
+            if isinstance(cached_exp, SerializableError):
+                return ExpState(rev=rev, error=cached_exp)
+            return ExpState(rev=rev, data=cached_exp)
+    if rev == "workspace" and isinstance(repo.fs, LocalFileSystem):
+        orig_cwd: Optional[str] = os.getcwd()
+        os.chdir(repo.root_dir)
+    else:
+        orig_cwd = None
+    try:
+        data = _collect_rev(
+            repo,
+            rev,
+            param_deps=param_deps,
+            force=force,
+            **kwargs,
+        )
+        if not (rev == "workspace" or param_deps or data.contains_error):
+            cache.put(data, force=True)
+        return ExpState(rev=rev, data=data)
+    except Exception as exc:  # noqa: BLE001, pylint: disable=broad-except
+        logger.debug("", exc_info=True)
+        error = SerializableError(str(exc), type(exc).__name__)
+        return ExpState(rev=rev, error=error)
+    finally:
+        if orig_cwd:
+            os.chdir(orig_cwd)
+
+
+def _collect_rev(
+    repo: "Repo",
+    rev: str,
+    param_deps: bool = False,
+    **kwargs,
+) -> SerializableExp:
+    with repo.switch(rev) as rev:
+        if rev == "workspace":
+            timestamp: Optional[datetime] = None
+        else:
+            commit = repo.scm.resolve_commit(rev)
+            timestamp = datetime.fromtimestamp(commit.commit_time)
+
+        return SerializableExp.from_repo(
+            repo,
+            rev=rev,
+            param_deps=param_deps,
+            timestamp=timestamp,
+        )
+
+
+def collect_branch(
+    repo: "Repo",
+    rev: str,
+    end_rev: Optional[str] = None,
+    **kwargs,
+) -> Iterator["ExpState"]:
+    """Iterate over exp states in a Git branch.
+
+    Git branch will be traversed in reverse, starting from rev.
+
+    Args:
+        rev: Branch tip (head).
+        end_rev: If specified, traversal will stop when end_rev is reached
+            (exclusive, end_rev will not be collected).
+    """
+    try:
+        for branch_rev in repo.scm.branch_revs(rev, end_rev):
+            yield collect_rev(repo, branch_rev, **kwargs)
+    except (SCMError, InnerSCMError):
+        pass
+
+
+def collect_exec_branch(
+    repo: "Repo",
+    baseline_rev: str,
+    **kwargs,
+) -> Iterator["ExpState"]:
+    """Iterate over active experiment branch for the current executor."""
+    last_rev = repo.scm.get_ref(EXEC_BRANCH) or repo.scm.get_rev()
+    last_rev = repo.scm.get_rev()
+    yield collect_rev(repo, "workspace", **kwargs)
+    if last_rev != baseline_rev:
+        yield from collect_branch(repo, last_rev, baseline_rev, **kwargs)
+
+
+def collect_queued(
+    repo: "Repo",
+    baseline_revs: Collection[str],
+    **kwargs,
+) -> Dict[str, List["ExpRange"]]:
+    """Collect queued experiments derived from the specified revisions.
+
+    Args:
+        repo: Repo.
+        baseline_revs: Resolved baseline Git SHAs.
+
+    Returns:
+        Dict mapping baseline revision to list of queued experiments.
+    """
+    if not baseline_revs:
+        return {}
+    return repo.experiments.celery_queue.collect_queued_data(baseline_revs, **kwargs)
+
+
+def collect_active(
+    repo: "Repo",
+    baseline_revs: Collection[str],
+    **kwargs,
+) -> Dict[str, List["ExpRange"]]:
+    """Collect active (running) experiments derived from the specified revisions.
+
+    Args:
+        repo: Repo.
+        baseline_revs: Resolved baseline Git SHAs.
+
+    Returns:
+        Dict mapping baseline revision to list of active experiments.
+    """
+    if not baseline_revs:
+        return {}
+    result: Dict[str, List["ExpRange"]] = {}
+    exps = repo.experiments
+    for queue in (exps.workspace_queue, exps.tempdir_queue, exps.celery_queue):
+        for baseline, active_exps in queue.collect_active_data(
+            baseline_revs, **kwargs
+        ).items():
+            if baseline in result:
+                result[baseline].extend(active_exps)
+            else:
+                result[baseline] = list(active_exps)
+    return result
+
+
+def collect_failed(
+    repo: "Repo",
+    baseline_revs: Collection[str],
+    **kwargs,
+) -> Dict[str, List["ExpRange"]]:
+    """Collect failed experiments derived from the specified revisions.
+
+    Args:
+        repo: Repo.
+        baseline_revs: Resolved baseline Git SHAs.
+
+    Returns:
+        Dict mapping baseline revision to list of active experiments.
+    """
+    if not baseline_revs:
+        return {}
+    return repo.experiments.celery_queue.collect_failed_data(baseline_revs, **kwargs)
+
+
+def collect_successful(
+    repo: "Repo",
+    baseline_revs: Collection[str],
+    **kwargs,
+) -> Dict[str, List["ExpRange"]]:
+    """Collect successful experiments derived from the specified revisions.
+
+    Args:
+        repo: Repo.
+        baseline_revs: Resolved baseline Git SHAs.
+
+    Returns:
+        Dict mapping baseline revision to successful experiments.
+    """
+    result: Dict[str, List["ExpRange"]] = {}
+    for baseline_rev in baseline_revs:
+        result[baseline_rev] = list(_collect_baseline(repo, baseline_rev, **kwargs))
+    return result
+
+
+def _collect_baseline(
+    repo: "Repo",
+    baseline_rev: str,
+    **kwargs,
+) -> Iterator["ExpRange"]:
+    """Iterate over experiments derived from a baseline revision.
+
+    Args:
+        repo: Repo.
+        baseline_revs: Resolved baseline Git SHAs.
+
+    Yields:
+        Tuple of (timestamp, exp_range).
+    """
+    ref_info = ExpRefInfo(baseline_sha=baseline_rev)
+    refs: Optional[Iterable[str]] = kwargs.get("refs")
+    if refs:
+        ref_it = (ref for ref in iter(refs) if ref.startswith(str(ref_info)))
+    else:
+        ref_it = repo.scm.iter_refs(base=str(ref_info))
+    for ref in ref_it:
+        try:
+            ref_info = ExpRefInfo.from_ref(ref)
+            exp_rev = repo.scm.get_ref(ref)
+            if not exp_rev:
+                continue
+        except (InvalidExpRefError, SCMError, InnerSCMError):
+            continue
+        exps = list(collect_branch(repo, exp_rev, baseline_rev, **kwargs))
+        if exps:
+            exps[0].name = ref_info.name
+            yield ExpRange(exps, name=ref_info.name)
+
+
+def collect(
+    repo: "Repo",
+    revs: Union[List[str], str, None] = None,
+    all_branches: bool = False,
+    all_tags: bool = False,
+    all_commits: bool = False,
+    num: int = 1,
+    hide_queued: bool = False,
+    hide_failed: bool = False,
+    sha_only: bool = False,
+    **kwargs,
+) -> List["ExpState"]:
+    """Collect baseline revisions and derived experiments."""
+    assert isinstance(repo.scm, Git)
+    if repo.scm.no_commits:
+        return []
+    if not any([revs, all_branches, all_tags, all_commits]):
+        revs = ["HEAD"]
+    if isinstance(revs, str):
+        revs = [revs]
+    cached_refs = list(repo.scm.iter_refs())
+    baseline_revs = list(
+        iter_revs(
+            repo.scm,
+            revs=revs,
+            num=num,
+            all_branches=all_branches,
+            all_tags=all_tags,
+            all_commits=all_commits,
+        )
+    )
+    if sha_only:
+        baseline_names: Dict[str, Optional[str]] = {}
+    else:
+        baseline_names = _describe(repo.scm, baseline_revs, refs=cached_refs)
+
+    workspace_data = collect_rev(repo, "workspace", **kwargs)
+    result: List["ExpState"] = [workspace_data]
+    queued = collect_queued(repo, baseline_revs, **kwargs) if not hide_queued else {}
+    active = collect_active(repo, baseline_revs, **kwargs)
+    failed = collect_failed(repo, baseline_revs, **kwargs) if not hide_failed else {}
+    successful = collect_successful(repo, baseline_revs, **kwargs)
+
+    for baseline_rev in baseline_revs:
+        baseline_data = collect_rev(repo, baseline_rev)
+        experiments = list(
+            itertools.chain.from_iterable(
+                _sorted_ranges(collected.get(baseline_rev, []))
+                for collected in (active, successful, queued, failed)
+            )
+        )
+        result.append(
+            ExpState(
+                rev=baseline_rev,
+                name=baseline_names.get(baseline_rev),
+                data=baseline_data.data,
+                error=baseline_data.error,
+                experiments=experiments if experiments else None,
+            )
+        )
+    return result
+
+
+def _describe(
+    scm: "Git",
+    revs: Iterable[str],
+    refs: Optional[Iterable[str]] = None,
+) -> Dict[str, Optional[str]]:
+    """Describe revisions using a tag, branch.
+
+    The first matching name will be returned for each rev. Names are preferred in this
+    order:
+        - current branch (if rev matches HEAD and HEAD is a branch)
+        - tags
+        - branches
+
+    Returns:
+        Dict mapping revisions from revs to a name.
+    """
+
+    head_rev = scm.get_rev()
+    head_ref = scm.get_ref("HEAD", follow=False)
+    if head_ref and head_ref.startswith("refs/heads/"):
+        head_branch = head_ref[len("refs/heads/") :]
+    else:
+        head_branch = None
+
+    tags = {}
+    branches = {}
+    ref_it = iter(refs) if refs else scm.iter_refs()
+    for ref in ref_it:
+        is_tag = ref.startswith("refs/tags/")
+        is_branch = ref.startswith("refs/heads/")
+        if not (is_tag or is_branch):
+            continue
+        rev = scm.get_ref(ref)
+        if not rev:
+            logger.debug("unresolved ref %s", ref)
+            continue
+        if is_tag and rev not in tags:
+            tags[rev] = ref[len("refs/tags/") :]
+        if is_branch and rev not in branches:
+            branches[rev] = ref[len("refs/heads/") :]
+    names: Dict[str, Optional[str]] = {}
+    for rev in revs:
+        if rev == head_rev and head_branch:
+            names[rev] = head_branch
+        else:
+            names[rev] = tags.get(rev) or branches.get(rev)
+    return names
+
+
+def _sorted_ranges(exp_ranges: Iterable["ExpRange"]) -> List["ExpRange"]:
+    """Return list of ExpRange sorted by (timestamp, rev)."""
+
+    def _head_timestamp(exp_range: "ExpRange") -> Tuple[datetime, str]:
+        head_exp = first(exp_range.revs)
+        if head_exp and head_exp.data and head_exp.data.timestamp:
+            return head_exp.data.timestamp, head_exp.rev
+
+        return datetime.fromtimestamp(0), ""
+
+    return sorted(exp_ranges, key=_head_timestamp, reverse=True)

dvc/repo/experiments/diff.py

@@ -7,7 +7,7 @@ logger = logging.getLogger(__name__)
 
 
 def diff(repo, *args, a_rev=None, b_rev=None, param_deps=False, **kwargs):
-    from dvc.repo.experiments.show import collect_experiment_commit
+    from dvc.repo.experiments.collect import collect_rev
     from dvc.scm import resolve_rev
 
     if repo.scm.no_commits:
@@ -15,22 +15,21 @@ def diff(repo, *args, a_rev=None, b_rev=None, param_deps=False, **kwargs):
 
     if a_rev:
         rev = resolve_rev(repo.scm, a_rev)
-        old = collect_experiment_commit(repo, rev, param_deps=param_deps)
     else:
-        old = collect_experiment_commit(repo, "HEAD", param_deps=param_deps)
+        rev = resolve_rev(repo.scm, "HEAD")
+    old = collect_rev(repo, rev, param_deps=param_deps)
 
     if b_rev:
         rev = resolve_rev(repo.scm, b_rev)
-        new = collect_experiment_commit(repo, rev, param_deps=param_deps)
     else:
-        new = collect_experiment_commit(repo, "workspace", param_deps=param_deps)
+        rev = "workspace"
+    new = collect_rev(repo, rev, param_deps=param_deps)
 
     with_unchanged = kwargs.pop("all", False)
-
     return {
         key: _diff(
-            format_dict(old.get("data", {}).get(key, {})),
-            format_dict(new.get("data", {}).get(key, {})),
+            format_dict(getattr(old.data, key, {})),
+            format_dict(getattr(new.data, key, {})),
             with_unchanged=with_unchanged,
         )
         for key in ["metrics", "params"]

dvc/repo/experiments/exceptions.py

@@ -31,21 +31,6 @@ class ExperimentExistsError(DvcException):
         self.name = name
 
 
-class CheckpointExistsError(DvcException):
-    def __init__(self, name: str):
-        msg = (
-            "Reproduced checkpoint experiment conflicts with existing "
-            f"experiment '{name}'. To restart (and overwrite) the existing "
-            "experiment run:\n\n"
-            "\tdvc exp run -f ...\n\n"
-            "To resume the existing experiment, run:\n\n"
-            f"\tdvc exp apply {name}\n"
-            "\tdvc exp run\n"
-        )
-        super().__init__(msg)
-        self.name = name
-
-
 class InvalidExpRefError(DvcException):
     def __init__(self, ref):
         super().__init__(f"'{ref}' is not a valid experiment refname.")
@@ -114,3 +99,10 @@ class UnresolvedRunningExpNamesError(UnresolvedExpNamesError):
 
 class ExpQueueEmptyError(DvcException):
     pass
+
+
+class ExpNotStartedError(DvcException):
+    def __init__(self, name: str):
+        super().__init__(
+            f"Queued experiment '{name}' exists but has not started running yet"
+        )

dvc/repo/experiments/executor/base.py

@@ -6,13 +6,14 @@ from abc import ABC, abstractmethod
 from contextlib import contextmanager
 from dataclasses import asdict, dataclass
 from enum import IntEnum
-from functools import partial
+from itertools import chain
 from typing import (
     TYPE_CHECKING,
     Any,
     Callable,
     Dict,
     Iterable,
+    Iterator,
     List,
     NamedTuple,
     Optional,
@@ -27,20 +28,15 @@ from scmrepo.exceptions import SCMError
 
 from dvc.env import DVC_EXP_AUTO_PUSH, DVC_EXP_GIT_REMOTE
 from dvc.exceptions import DvcException
-from dvc.repo.experiments.exceptions import CheckpointExistsError, ExperimentExistsError
-from dvc.repo.experiments.refs import (
-    EXEC_BASELINE,
-    EXEC_BRANCH,
-    EXEC_CHECKPOINT,
-    ExpRefInfo,
-)
+from dvc.repo.experiments.exceptions import ExperimentExistsError
+from dvc.repo.experiments.refs import EXEC_BASELINE, EXEC_BRANCH, ExpRefInfo
 from dvc.repo.experiments.utils import to_studio_params
 from dvc.repo.metrics.show import _collect_top_level_metrics
 from dvc.repo.params.show import _collect_top_level_params
 from dvc.stage.serialize import to_lockfile
-from dvc.ui import ui
 from dvc.utils import dict_sha256, env2bool, relpath
 from dvc.utils.fs import remove
+from dvc.utils.studio import env_to_config
 
 if TYPE_CHECKING:
     from queue import Queue
@@ -259,12 +255,23 @@ class BaseExecutor(ABC):
             **kwargs,
         )
 
+    @classmethod
+    def _get_top_level_paths(cls, repo: "Repo") -> List["str"]:
+        return list(
+            chain(
+                _collect_top_level_metrics(repo),
+                _collect_top_level_params(repo),
+                repo.index._plot_sources,  # pylint: disable=protected-access
+            )
+        )
+
     @classmethod
     def save(
         cls,
         info: "ExecutorInfo",
         force: bool = False,
         include_untracked: Optional[List[str]] = None,
+        message: Optional[str] = None,
     ) -> ExecutorResult:
         from dvc.dvcfile import LOCK_FILE
         from dvc.repo import Repo
@@ -280,11 +287,7 @@ class BaseExecutor(ABC):
             os.chdir(dvc.root_dir)
 
         include_untracked = include_untracked or []
-        include_untracked.extend(_collect_top_level_metrics(dvc))
-        include_untracked.extend(_collect_top_level_params(dvc))
-        include_untracked.extend(
-            dvc.index._plot_sources  # pylint: disable=protected-access
-        )
+        include_untracked.extend(cls._get_top_level_paths(dvc))
         # dvc repro automatically stages dvc.lock. Running redundant `git add`
         # on it causes an error when exiting the detached head context.
         if LOCK_FILE in dvc.scm.untracked_files():
@@ -300,6 +303,7 @@ class BaseExecutor(ABC):
                 exp_hash,
                 exp_name=info.name,
                 force=force,
+                message=message,
             )
             ref: Optional[str] = dvc.scm.get_ref(EXEC_BRANCH, follow=False)
             exp_ref = ExpRefInfo.from_ref(ref) if ref else None
@@ -370,7 +374,7 @@ class BaseExecutor(ABC):
         dest_scm: "Git",
         refs: List[str],
         force: bool = False,
-        on_diverged: Optional[Callable[[str, bool], None]] = None,
+        on_diverged: Optional[Callable[[str], None]] = None,
         **kwargs,
     ) -> Iterable[str]:
         """Fetch reproduced experiment refs into the specified SCM.
@@ -379,41 +383,32 @@ class BaseExecutor(ABC):
             dest_scm: Destination Git instance.
             refs: reference names to be fetched from the remotes.
             force: If True, diverged refs will be overwritten
-            on_diverged: Callback in the form on_diverged(ref, is_checkpoint)
+            on_diverged: Callback in the form on_diverged(ref)
                 to be called when an experiment ref has diverged.
 
         Extra kwargs will be passed into the remote git client.
         """
 
-        if EXEC_CHECKPOINT in refs:
-            refs.remove(EXEC_CHECKPOINT)
-            has_checkpoint = True
-        else:
-            has_checkpoint = False
-
         def on_diverged_ref(orig_ref: str, new_rev: str):
             if force:
                 logger.debug("Replacing existing experiment '%s'", orig_ref)
                 return True
 
             if on_diverged:
-                return on_diverged(orig_ref, has_checkpoint)
+                return on_diverged(orig_ref)
 
-            self._raise_ref_conflict(dest_scm, orig_ref, new_rev, has_checkpoint)
+            self._raise_ref_conflict(dest_scm, orig_ref, new_rev)
             logger.debug("Reproduced existing experiment '%s'", orig_ref)
             return False
 
         # fetch experiments
         try:
             refspecs = [f"{ref}:{ref}" for ref in refs]
-            # update last run checkpoint (if it exists)
-            if has_checkpoint:
-                refspecs.append(f"{EXEC_CHECKPOINT}:{EXEC_CHECKPOINT}")
             dest_scm.fetch_refspecs(
                 self.git_url,
                 refspecs,
                 on_diverged=on_diverged_ref,
-                force=force or has_checkpoint,
+                force=force,
                 **kwargs,
             )
         except SCMError:
@@ -453,6 +448,7 @@ class BaseExecutor(ABC):
         log_errors: bool = True,
         log_level: Optional[int] = None,
         copy_paths: Optional[List[str]] = None,
+        message: Optional[str] = None,
         **kwargs,
     ) -> "ExecutorResult":
         """Run dvc repro and return the result.
@@ -465,6 +461,7 @@ class BaseExecutor(ABC):
         from dvc.repo.checkout import checkout as dvc_checkout
         from dvc.repo.reproduce import reproduce as dvc_reproduce
         from dvc.stage import PipelineStage
+        from dvc.ui import ui
 
         auto_push = env2bool(DVC_EXP_AUTO_PUSH)
         git_remote = os.getenv(DVC_EXP_GIT_REMOTE, None)
@@ -485,11 +482,15 @@ class BaseExecutor(ABC):
         exp_ref: Optional["ExpRefInfo"] = None
         repro_force: bool = False
 
+        if info.name:
+            ui.write(f"Reproducing experiment '{info.name}'")
+
         with cls._repro_dvc(
             info,
             infofile,
             log_errors=log_errors,
             copy_paths=copy_paths,
+            message=message,
             **kwargs,
         ) as dvc:
             if auto_push:
@@ -508,56 +509,36 @@ class BaseExecutor(ABC):
 
             repro_dry = kwargs.get("dry")
 
-            # NOTE: checkpoint outs are handled as a special type of persist
-            # out:
-            #
-            # - checkpoint out may not yet exist if this is the first time this
-            #   experiment has been run, this is not an error condition for
-            #   experiments
-            # - if experiment was run with --reset, the checkpoint out will be
-            #   removed at the start of the experiment (regardless of any
-            #   dvc.lock entry for the checkpoint out)
-            # - if run without --reset, the checkpoint out will be checked out
-            #   using any hash present in dvc.lock (or removed if no entry
-            #   exists in dvc.lock)
-            checkpoint_reset: bool = kwargs.pop("reset", False)
             if not repro_dry:
                 dvc_checkout(
                     dvc,
                     targets=targets,
                     with_deps=targets is not None,
                     force=True,
-                    quiet=True,
                     allow_missing=True,
-                    checkpoint_reset=checkpoint_reset,
                     recursive=kwargs.get("recursive", False),
                 )
 
-            checkpoint_func = partial(
-                cls.checkpoint_callback,
-                dvc,
-                dvc.scm,
-                info.name,
-                repro_force or checkpoint_reset,
-            )
             stages = dvc_reproduce(
                 dvc,
                 *args,
                 on_unchanged=filter_pipeline,
-                checkpoint_func=checkpoint_func,
                 **kwargs,
             )
+            if paths := cls._get_top_level_paths(dvc):
+                logger.debug("Staging top-level files: %s", paths)
+                dvc.scm_context.add(paths)
 
             exp_hash = cls.hash_exp(stages)
             if not repro_dry:
                 ref, exp_ref, repro_force = cls._repro_commit(
                     dvc,
                     info,
-                    stages,
                     exp_hash,
                     auto_push,
                     git_remote,
                     repro_force,
+                    message=message,
                 )
                 info.result_hash = exp_hash
                 info.result_ref = ref
@@ -573,19 +554,18 @@ class BaseExecutor(ABC):
         cls,
         dvc,
         info,
-        stages,
         exp_hash,
         auto_push,
         git_remote,
         repro_force,
+        message: Optional[str] = None,
     ) -> Tuple[Optional[str], Optional["ExpRefInfo"], bool]:
-        is_checkpoint = any(stage.is_checkpoint for stage in stages)
         cls.commit(
             dvc.scm,
             exp_hash,
             exp_name=info.name,
             force=repro_force,
-            checkpoint=is_checkpoint,
+            message=message,
         )
         if auto_push:
             cls._auto_push(dvc, dvc.scm, git_remote)
@@ -613,12 +593,12 @@ class BaseExecutor(ABC):
         infofile: Optional[str] = None,
         log_errors: bool = True,
         copy_paths: Optional[List[str]] = None,
+        message: Optional[str] = None,
         **kwargs,
-    ):
+    ) -> Iterator["Repo"]:
         from dvc_studio_client.post_live_metrics import post_live_metrics
 
         from dvc.repo import Repo
-        from dvc.stage.monitor import CheckpointKilledError
 
         with Repo(os.path.join(info.root_dir, info.dvc_dir)) as dvc:
             info.status = TaskStatus.RUNNING
@@ -636,20 +616,27 @@ class BaseExecutor(ABC):
             else:
                 os.chdir(dvc.root_dir)
 
+            args_path = os.path.join(dvc.tmp_dir, cls.PACKED_ARGS_FILE)
+            if os.path.exists(args_path):
+                _, kwargs = cls.unpack_repro_args(args_path)
+            dvc_studio_config = dvc.config.get("studio")
+            # set missing config options using saved config
+            # inferring repo url will fail if not set here
+            run_env_config = env_to_config(kwargs.get("run_env", {}))
+            dvc_studio_config = {**run_env_config, **dvc_studio_config}
             try:
                 post_live_metrics(
                     "start",
                     info.baseline_rev,
-                    info.name,
+                    info.name,  # type: ignore[arg-type]
                     "dvc",
                     params=to_studio_params(dvc.params.show()),
+                    dvc_studio_config=dvc_studio_config,
+                    message=message,
                 )
                 logger.debug("Running repro in '%s'", os.getcwd())
                 yield dvc
                 info.status = TaskStatus.SUCCESS
-            except CheckpointKilledError:
-                info.status = TaskStatus.FAILED
-                raise
             except DvcException:
                 if log_errors:
                     logger.exception("")
@@ -664,10 +651,11 @@ class BaseExecutor(ABC):
                 post_live_metrics(
                     "done",
                     info.baseline_rev,
-                    info.name,
+                    info.name,  # type: ignore[arg-type]
                     "dvc",
                     experiment_rev=dvc.experiments.scm.get_ref(EXEC_BRANCH),
                     metrics=get_in(dvc.metrics.show(), ["", "data"]),
+                    dvc_studio_config=dvc_studio_config,
                 )
 
                 if infofile is not None:
@@ -713,24 +701,6 @@ class BaseExecutor(ABC):
                 exc,
             )
 
-    @classmethod
-    def checkpoint_callback(
-        cls,
-        dvc: "Repo",
-        scm: "Git",
-        name: Optional[str],
-        force: bool,
-        unchanged: Iterable["PipelineStage"],
-        stages: Iterable["PipelineStage"],
-    ):
-        exp_hash = cls.hash_exp(list(stages) + list(unchanged))
-        exp_rev = cls.commit(scm, exp_hash, exp_name=name, force=force, checkpoint=True)
-
-        if env2bool(DVC_EXP_AUTO_PUSH):
-            git_remote = os.getenv(DVC_EXP_GIT_REMOTE)
-            cls._auto_push(dvc, scm, git_remote)
-        ui.write(f"Checkpoint experiment iteration '{exp_rev[:7]}'.")
-
     @classmethod
     def commit(
         cls,
@@ -738,7 +708,7 @@ class BaseExecutor(ABC):
         exp_hash: str,
         exp_name: Optional[str] = None,
         force: bool = False,
-        checkpoint: bool = False,
+        message: Optional[str] = None,
     ):
         """Commit stages as an experiment and return the commit SHA."""
         rev = scm.get_rev()
@@ -768,26 +738,24 @@ class BaseExecutor(ABC):
                 logger.debug("Commit to new experiment branch '%s'", branch)
 
         scm.add([], update=True)
-        scm.commit(f"dvc: commit experiment {exp_hash}", no_verify=True)
+        message = message or f"dvc: commit experiment {exp_hash}"
+        scm.commit(message, no_verify=True)
         new_rev = scm.get_rev()
         if check_conflict:
-            new_rev = cls._raise_ref_conflict(scm, branch, new_rev, checkpoint)
+            new_rev = cls._raise_ref_conflict(scm, branch, new_rev)
         else:
             scm.set_ref(branch, new_rev, old_ref=old_ref)
         scm.set_ref(EXEC_BRANCH, branch, symbolic=True)
-        if checkpoint:
-            scm.set_ref(EXEC_CHECKPOINT, new_rev)
+
         return new_rev
 
     @staticmethod
-    def _raise_ref_conflict(scm, ref, new_rev, checkpoint):
+    def _raise_ref_conflict(scm, ref, new_rev):
         # If this commit is a duplicate of the existing commit at 'ref', return
         # the existing commit. Otherwise, error out and require user to re-run
         # with --force as needed
         orig_rev = scm.get_ref(ref)
         if scm.diff(orig_rev, new_rev):
-            if checkpoint:
-                raise CheckpointExistsError(ref)
             raise ExperimentExistsError(ref)
         return orig_rev
 

dvc/repo/experiments/executor/local.py

@@ -10,14 +10,12 @@ from shortuuid import uuid
 
 from dvc.lock import LockError
 from dvc.repo.experiments.refs import (
-    EXEC_APPLY,
     EXEC_BASELINE,
     EXEC_BRANCH,
-    EXEC_CHECKPOINT,
     EXEC_HEAD,
     EXEC_MERGE,
     EXEC_NAMESPACE,
-    EXPS_TEMP,
+    TEMP_NAMESPACE,
 )
 from dvc.repo.experiments.utils import EXEC_TMP_DIR, get_exp_rwlock
 from dvc.scm import SCM, Git
@@ -90,9 +88,9 @@ class TempDirExecutor(BaseLocalExecutor):
         if infofile:
             self.info.dump_json(infofile)
 
-        temp_head = f"{EXPS_TEMP}/head-{uuid()}"
-        temp_merge = f"{EXPS_TEMP}/merge-{uuid()}"
-        temp_baseline = f"{EXPS_TEMP}/baseline-{uuid()}"
+        temp_head = f"{TEMP_NAMESPACE}/head-{uuid()}"
+        temp_merge = f"{TEMP_NAMESPACE}/merge-{uuid()}"
+        temp_baseline = f"{TEMP_NAMESPACE}/baseline-{uuid()}"
 
         temp_ref_dict = {
             temp_head: entry.head_rev,
@@ -124,9 +122,6 @@ class TempDirExecutor(BaseLocalExecutor):
                 if self.scm.get_ref(EXEC_BRANCH):
                     self.scm.remove_ref(EXEC_BRANCH)
 
-            if self.scm.get_ref(EXEC_CHECKPOINT):
-                self.scm.remove_ref(EXEC_CHECKPOINT)
-
         # checkout EXEC_HEAD and apply EXEC_MERGE on top of it without
         # committing
         assert isinstance(self.scm, Git)
@@ -157,7 +152,7 @@ class TempDirExecutor(BaseLocalExecutor):
         self, repo: "Repo", rev: str, run_cache: bool = True  # noqa: ARG002
     ):
         """Initialize DVC cache."""
-        self._update_config({"cache": {"dir": repo.cache.repo.path}})
+        self._update_config({"cache": {"dir": repo.cache.local_cache_dir}})
 
     def cleanup(self, infofile: Optional[str] = None):
         super().cleanup(infofile)
@@ -189,7 +184,6 @@ class WorkspaceExecutor(BaseLocalExecutor):
     def __init__(self, *args, **kwargs):
         super().__init__(*args, **kwargs)
         self._detach_stack = ExitStack()
-        self._orig_checkpoint = self.scm.get_ref(EXEC_CHECKPOINT)
 
     @classmethod
     def from_stash_entry(
@@ -251,6 +245,3 @@ class WorkspaceExecutor(BaseLocalExecutor):
             self.scm.remove_ref(EXEC_MERGE)
             if self.scm.get_ref(EXEC_BRANCH):
                 self.scm.remove_ref(EXEC_BRANCH)
-            checkpoint = self.scm.get_ref(EXEC_CHECKPOINT)
-            if checkpoint and checkpoint != self._orig_checkpoint:
-                self.scm.set_ref(EXEC_APPLY, checkpoint)

dvc/repo/experiments/executor/ssh.py

@@ -11,7 +11,6 @@ from funcy import first
 from dvc.repo.experiments.refs import (
     EXEC_BASELINE,
     EXEC_BRANCH,
-    EXEC_CHECKPOINT,
     EXEC_HEAD,
     EXEC_MERGE,
     EXEC_NAMESPACE,
@@ -162,7 +161,6 @@ class SSHExecutor(BaseExecutor):
                 self._ssh_cmd(fs, f"git symbolic-ref {EXEC_BRANCH} {branch}")
             else:
                 self._ssh_cmd(fs, f"git symbolic-ref -d {EXEC_BRANCH}", check=False)
-            self._ssh_cmd(fs, f"git update-ref -d {EXEC_CHECKPOINT}", check=False)
 
             # checkout EXEC_HEAD and apply EXEC_MERGE on top of it without
             # committing
@@ -212,8 +210,7 @@ class SSHExecutor(BaseExecutor):
         """Collect DVC cache."""
         from dvc.repo.experiments.pull import _pull_cache
 
-        with self.get_odb() as odb:
-            _pull_cache(repo, exp_ref, run_cache=run_cache, odb=odb)
+        _pull_cache(repo, exp_ref, run_cache=run_cache)
 
     @contextmanager
     def get_odb(self):
@@ -243,6 +240,7 @@ class SSHExecutor(BaseExecutor):
         log_errors: bool = True,
         log_level: Optional[int] = None,
         copy_paths: Optional[List[str]] = None,  # noqa: ARG003
+        message: Optional[str] = None,  # noqa: ARG003
         **kwargs,
     ) -> "ExecutorResult":
         """Reproduce an experiment on a remote machine over SSH.

dvc/repo/experiments/gc.py

@@ -1,53 +0,0 @@
-import logging
-from typing import Optional
-
-from dvc.repo import locked
-
-from .utils import exp_refs, remove_exp_refs
-
-logger = logging.getLogger(__name__)
-
-
-@locked
-def gc(
-    repo,
-    all_branches: Optional[bool] = False,
-    all_tags: Optional[bool] = False,
-    all_commits: Optional[bool] = False,
-    workspace: Optional[bool] = False,
-    commit_date: Optional[str] = None,
-    queued: Optional[bool] = False,
-):
-    keep_revs = set(
-        repo.brancher(
-            all_branches=all_branches,
-            all_tags=all_tags,
-            all_commits=all_commits,
-            commit_date=commit_date,
-            sha_only=True,
-        )
-    )
-    if workspace:
-        keep_revs.add(repo.scm.get_rev())
-
-    if not keep_revs:
-        return 0
-
-    to_remove = [
-        ref_info
-        for ref_info in exp_refs(repo.scm)
-        if ref_info.baseline_sha not in keep_revs
-    ]
-    remove_exp_refs(repo.scm, to_remove)
-    removed = len(to_remove)
-
-    delete_stashes = []
-    stash = repo.experiments.celery_queue.stash
-    for stash_rev, entry in stash.stash_revs.items():
-        if not queued or entry.baseline_rev not in keep_revs:
-            delete_stashes.append(stash_rev)
-    if delete_stashes:
-        repo.experiments.celery_queue.remove(delete_stashes)
-    removed += len(delete_stashes)
-
-    return removed

dvc/repo/experiments/init.py

@@ -1,284 +0,0 @@
-import logging
-import os
-from contextlib import contextmanager
-from functools import partial
-from typing import (
-    TYPE_CHECKING,
-    Any,
-    Callable,
-    Dict,
-    Iterable,
-    List,
-    Optional,
-    TextIO,
-    Tuple,
-    Union,
-)
-
-from funcy import compact, lremove, lsplit
-
-from dvc.exceptions import DvcException
-from dvc.stage import PipelineStage
-
-if TYPE_CHECKING:
-    from dvc.dependency import Dependency
-    from dvc.dvcfile import ProjectFile, SingleStageFile
-    from dvc.repo import Repo
-
-from dvc.ui import ui
-
-PROMPTS = {
-    "cmd": "[b]Command[/b] to execute",
-    "code": "Path to a [b]code[/b] file/directory",
-    "data": "Path to a [b]data[/b] file/directory",
-    "models": "Path to a [b]model[/b] file/directory",
-    "params": "Path to a [b]parameters[/b] file",
-    "metrics": "Path to a [b]metrics[/b] file",
-    "plots": "Path to a [b]plots[/b] file/directory",
-}
-
-
-def _prompts(
-    keys: Iterable[str],
-    defaults: Optional[Dict[str, str]] = None,
-    validator: Optional[Callable[[str, str], Union[str, Tuple[str, str]]]] = None,
-    allow_omission: bool = True,
-    stream: Optional[TextIO] = None,
-) -> Dict[str, Optional[str]]:
-    from dvc.ui.prompt import Prompt
-
-    defaults = defaults or {}
-    return {
-        key: Prompt.prompt_(
-            PROMPTS[key],
-            console=ui.error_console,
-            default=defaults.get(key),
-            validator=partial(validator, key) if validator else None,
-            allow_omission=allow_omission,
-            stream=stream,
-        )
-        for key in keys
-    }
-
-
-@contextmanager
-def _disable_logging(highest_level=logging.CRITICAL):
-    previous_level = logging.root.manager.disable
-
-    logging.disable(highest_level)
-
-    try:
-        yield
-    finally:
-        logging.disable(previous_level)
-
-
-def init_interactive(
-    defaults: Dict[str, str],
-    provided: Dict[str, str],
-    validator: Optional[Callable[[str, str], Union[str, Tuple[str, str]]]] = None,
-    stream: Optional[TextIO] = None,
-) -> Dict[str, str]:
-    command_prompts = lremove(provided.keys(), ["cmd"])
-    dependencies_prompts = lremove(provided.keys(), ["code", "data", "params"])
-    output_keys = ["models"]
-    if "live" not in provided:
-        output_keys.extend(["metrics", "plots"])
-    outputs_prompts = lremove(provided.keys(), output_keys)
-
-    ret: Dict[str, str] = {}
-    if "cmd" in provided:
-        ret["cmd"] = provided["cmd"]
-
-    for heading, prompts, allow_omission in (
-        ("", command_prompts, False),
-        ("Enter experiment dependencies.", dependencies_prompts, True),
-        ("Enter experiment outputs.", outputs_prompts, True),
-    ):
-        if prompts and heading:
-            ui.error_write(heading, styled=True)
-        response = _prompts(
-            prompts,
-            defaults=defaults,
-            allow_omission=allow_omission,
-            validator=validator,
-            stream=stream,
-        )
-        ret.update(compact(response))
-        if prompts:
-            ui.error_write(styled=True)
-    return ret
-
-
-def _check_stage_exists(
-    dvcfile: Union["ProjectFile", "SingleStageFile"],
-    name: str,
-    force: bool = False,
-) -> None:
-    if not force and dvcfile.exists() and name in dvcfile.stages:
-        from dvc.stage.exceptions import DuplicateStageName
-
-        hint = "Use '--force' to overwrite."
-        raise DuplicateStageName(f"Stage '{name}' already exists in 'dvc.yaml'. {hint}")
-
-
-def validate_prompts(repo: "Repo", key: str, value: str) -> Union[Any, Tuple[Any, str]]:
-    from dvc.ui.prompt import InvalidResponse
-
-    msg_format = "[yellow]'{0}' does not exist, the {1} will be created.[/]"
-    if key == "params":
-        from dvc.dependency.param import (
-            MissingParamsFile,
-            ParamsDependency,
-            ParamsIsADirectoryError,
-        )
-
-        assert isinstance(value, str)
-        try:
-            ParamsDependency(None, value, repo=repo).validate_filepath()
-        except MissingParamsFile:
-            return value, msg_format.format(value, "file")
-        except ParamsIsADirectoryError:
-            raise InvalidResponse(  # noqa: B904
-                f"[prompt.invalid]'{value}' is a directory. "
-                "Please retry with an existing parameters file."
-            )
-    elif key in ("code", "data") and not os.path.exists(value):
-        typ = "file" if is_file(value) else "directory"
-        return value, msg_format.format(value, typ)
-    return value
-
-
-def is_file(path: str) -> bool:
-    _, ext = os.path.splitext(path)
-    return bool(ext)
-
-
-def init_deps(stage: PipelineStage) -> List["Dependency"]:
-    from funcy import rpartial
-
-    from dvc.dependency import ParamsDependency
-    from dvc.fs import localfs
-
-    new_deps = [dep for dep in stage.deps if not dep.exists]
-    params, deps = lsplit(rpartial(isinstance, ParamsDependency), new_deps)
-
-    # always create a file for params, detect file/folder based on extension
-    # for other dependencies
-    dirs = [dep.fs_path for dep in deps if not is_file(dep.fs_path)]
-    files = [dep.fs_path for dep in deps + params if is_file(dep.fs_path)]
-    for path in dirs:
-        localfs.makedirs(path)
-    for path in files:
-        localfs.makedirs(localfs.path.parent(path), exist_ok=True)
-        localfs.touch(path)
-
-    return new_deps
-
-
-def init_out_dirs(stage: PipelineStage) -> List[str]:
-    from dvc.fs import localfs
-
-    new_dirs = []
-
-    # create dirs for outputs
-    for out in stage.outs:
-        path = out.def_path
-        if is_file(path):
-            path = localfs.path.parent(path)
-        if path and not localfs.exists(path):
-            localfs.makedirs(path)
-            new_dirs.append(path)
-
-    return new_dirs
-
-
-def init(
-    repo: "Repo",
-    name: str = "train",
-    type: str = "default",  # noqa: A002, pylint: disable=redefined-builtin
-    defaults: Optional[Dict[str, str]] = None,
-    overrides: Optional[Dict[str, str]] = None,
-    interactive: bool = False,
-    force: bool = False,
-    stream: Optional[TextIO] = None,
-) -> Tuple[PipelineStage, List["Dependency"], List[str]]:
-    from dvc.dvcfile import PROJECT_FILE, load_file
-
-    dvcfile = load_file(repo, PROJECT_FILE)
-    _check_stage_exists(dvcfile, name, force=force)
-
-    defaults = defaults.copy() if defaults else {}
-    overrides = overrides.copy() if overrides else {}
-
-    if interactive:
-        defaults = init_interactive(
-            validator=partial(validate_prompts, repo),
-            defaults=defaults,
-            provided=overrides,
-            stream=stream,
-        )
-    elif "live" in overrides:
-        # suppress `metrics`/`plots` if live is selected.
-        defaults.pop("metrics", None)
-        defaults.pop("plots", None)
-    else:
-        defaults.pop("live", None)  # suppress live otherwise
-
-    context: Dict[str, str] = {**defaults, **overrides}
-    assert "cmd" in context
-
-    params = context.get("params")
-    if params:
-        from dvc.dependency.param import (
-            MissingParamsFile,
-            ParamsDependency,
-            ParamsIsADirectoryError,
-        )
-
-        try:
-            ParamsDependency(None, params, repo=repo).validate_filepath()
-        except ParamsIsADirectoryError as exc:
-            raise DvcException(f"{exc}.")  # noqa: B904  # swallow cause for display
-        except MissingParamsFile:
-            pass
-
-    if type == "checkpoint":
-        outs_key = "checkpoints"
-        metrics_key = "metrics_persist_no_cache"
-        plots_key = "plots_persist_no_cache"
-    else:
-        outs_key = "outs"
-        metrics_key = "metrics_no_cache"
-        plots_key = "plots_no_cache"
-
-    models = [context.get("models")]
-    metrics = [context.get("metrics")]
-    plots = [context.get("plots")]
-    if live_path := context.pop("live", None):
-        metrics.append(os.path.join(live_path, "metrics.json"))
-        plots.append(os.path.join(live_path, "plots"))
-
-    stage = repo.stage.create(
-        name=name,
-        cmd=context["cmd"],
-        deps=compact([context.get("code"), context.get("data")]),
-        params=[{params: None}] if params else None,
-        force=force,
-        **{
-            outs_key: compact(models),
-            metrics_key: compact(metrics),
-            plots_key: compact(plots),
-        },
-    )
-    assert isinstance(stage, PipelineStage)
-
-    with _disable_logging(), repo.scm_context(autostage=True, quiet=True):
-        stage.dump(update_lock=False)
-        initialized_out_dirs = init_out_dirs(stage)
-        stage.ignore_outs()
-        initialized_deps = init_deps(stage)
-        if params:
-            repo.scm_context.track_file(params)
-
-    return stage, initialized_deps, initialized_out_dirs

dvc/repo/experiments/ls.py

@@ -1,6 +1,6 @@
 import logging
 from collections import defaultdict
-from typing import Optional
+from typing import Dict, List, Optional, Tuple, Union
 
 from dvc.repo import locked
 from dvc.repo.scm_context import scm_context
@@ -15,14 +15,21 @@ logger = logging.getLogger(__name__)
 @scm_context
 def ls(
     repo,
-    rev: Optional[str] = None,
+    rev: Optional[Union[List[str], str]] = None,
     all_commits: bool = False,
     num: int = 1,
     git_remote: Optional[str] = None,
-):
+) -> Dict[str, List[Tuple[str, Optional[str]]]]:
+    """List experiments.
+
+    Returns a dict mapping baseline revs to a list of (exp_name, exp_sha) tuples.
+    """
     rev_set = None
     if not all_commits:
-        revs = iter_revs(repo.scm, [rev or "HEAD"], num)
+        rev = rev or "HEAD"
+        if isinstance(rev, str):
+            rev = [rev]
+        revs = iter_revs(repo.scm, rev, num)
         rev_set = set(revs.keys())
     ref_info_dict = exp_refs_by_baseline(repo.scm, rev_set, git_remote)
 
@@ -33,9 +40,14 @@ def ls(
 
     results = defaultdict(list)
     for baseline in ref_info_dict:
-        name = baseline[:7]
+        name = baseline
         if tags[baseline] or ref_heads[baseline]:
-            name = tags[baseline] or ref_heads[baseline][len(base) + 1 :]
-        results[name] = [info.name for info in ref_info_dict[baseline]]
+            name = tags[baseline] or ref_heads[baseline]
+        for info in ref_info_dict[baseline]:
+            if git_remote:
+                exp_rev = None
+            else:
+                exp_rev = repo.scm.get_ref(str(info))
+            results[name].append((info.name, exp_rev))
 
     return results

dvc/repo/experiments/pull.py

@@ -21,9 +21,9 @@ logger = logging.getLogger(__name__)
 def pull(  # noqa: C901
     repo,
     git_remote: str,
-    exp_names: Union[Iterable[str], str],
+    exp_names: Optional[Union[Iterable[str], str]] = None,
     all_commits=False,
-    rev: Optional[str] = None,
+    rev: Optional[Union[List[str], str]] = None,
     num=1,
     force: bool = False,
     pull_cache: bool = False,
@@ -32,28 +32,30 @@ def pull(  # noqa: C901
     exp_ref_set: Set["ExpRefInfo"] = set()
     if all_commits:
         exp_ref_set.update(exp_refs(repo.scm, git_remote))
+    elif exp_names:
+        if isinstance(exp_names, str):
+            exp_names = [exp_names]
+        exp_ref_dict = resolve_name(repo.scm, exp_names, git_remote)
+
+        unresolved_exp_names = []
+        for exp_name, exp_ref in exp_ref_dict.items():
+            if exp_ref is None:
+                unresolved_exp_names.append(exp_name)
+            else:
+                exp_ref_set.add(exp_ref)
+
+        if unresolved_exp_names:
+            raise UnresolvedExpNamesError(unresolved_exp_names)
+
     else:
-        if exp_names:
-            if isinstance(exp_names, str):
-                exp_names = [exp_names]
-            exp_ref_dict = resolve_name(repo.scm, exp_names, git_remote)
-
-            unresolved_exp_names = []
-            for exp_name, exp_ref in exp_ref_dict.items():
-                if exp_ref is None:
-                    unresolved_exp_names.append(exp_name)
-                else:
-                    exp_ref_set.add(exp_ref)
-
-            if unresolved_exp_names:
-                raise UnresolvedExpNamesError(unresolved_exp_names)
-
-        if rev:
-            rev_dict = iter_revs(repo.scm, [rev], num)
-            rev_set = set(rev_dict.keys())
-            ref_info_dict = exp_refs_by_baseline(repo.scm, rev_set, git_remote)
-            for _, ref_info_list in ref_info_dict.items():
-                exp_ref_set.update(ref_info_list)
+        rev = rev or "HEAD"
+        if isinstance(rev, str):
+            rev = [rev]
+        rev_dict = iter_revs(repo.scm, rev, num)
+        rev_set = set(rev_dict.keys())
+        ref_info_dict = exp_refs_by_baseline(repo.scm, rev_set, git_remote)
+        for _, ref_info_list in ref_info_dict.items():
+            exp_ref_set.update(ref_info_list)
 
     pull_result = _pull(repo, git_remote, exp_ref_set, force)
 
@@ -105,10 +107,9 @@ def _pull_cache(
     dvc_remote=None,
     jobs=None,
     run_cache=False,
-    odb=None,
 ):
     if isinstance(refs, ExpRefInfo):
         refs = [refs]
     revs = list(exp_commits(repo.scm, refs))
     logger.debug("dvc fetch experiment '%s'", refs)
-    repo.fetch(jobs=jobs, remote=dvc_remote, run_cache=run_cache, revs=revs, odb=odb)
+    repo.fetch(jobs=jobs, remote=dvc_remote, run_cache=run_cache, revs=revs)

dvc/repo/experiments/push.py

@@ -14,11 +14,13 @@ from typing import (
 from funcy import compact, group_by
 from scmrepo.git.backend.base import SyncStatus
 
+from dvc.env import DVC_STUDIO_TOKEN, DVC_STUDIO_URL
 from dvc.exceptions import DvcException
 from dvc.repo import locked
 from dvc.repo.scm_context import scm_context
 from dvc.scm import Git, TqdmGit, iter_revs
 from dvc.utils import env2bool
+from dvc.utils.collections import ensure_list
 
 from .exceptions import UnresolvedExpNamesError
 from .refs import ExpRefInfo
@@ -39,21 +41,18 @@ class UploadError(DvcException):
 def notify_refs_to_studio(
     repo: "Repo", git_remote: str, **refs: List[str]
 ) -> Optional[str]:
-    config = repo.config["feature"]
+    import os
+
+    config = repo.config["studio"]
     refs = compact(refs)
     if not refs or env2bool("DVC_TEST"):
         return None
 
-    if not (config.get("studio_token") or config["push_exp_to_studio"]):
-        logger.debug(
-            "Either feature.studio_token or feature.push_exp_to_studio config "
-            "needs to be set."
-        )
-        return None
-
-    import os
-
-    token = os.environ.get("STUDIO_TOKEN") or config.get("studio_token")
+    token = (
+        os.environ.get(DVC_STUDIO_TOKEN)
+        or os.environ.get("STUDIO_TOKEN")
+        or config.get("token")
+    )
     if not token:
         logger.debug("Studio token not found.")
         return None
@@ -63,19 +62,44 @@ def notify_refs_to_studio(
     from dvc.utils import studio
 
     _, repo_url = get_remote_repo(repo.scm.dulwich.repo, git_remote)
-    studio_url = config.get("studio_url")
+    studio_url = os.environ.get(DVC_STUDIO_URL) or config.get("url")
     d = studio.notify_refs(repo_url, token, base_url=studio_url, **refs)
     return d.get("url")
 
 
+def exp_refs_from_names(scm: "Git", exp_names: List[str]) -> Set["ExpRefInfo"]:
+    exp_ref_set = set()
+    exp_ref_dict = resolve_name(scm, exp_names)
+    unresolved_exp_names = []
+    for exp_name, exp_ref in exp_ref_dict.items():
+        if exp_ref is None:
+            unresolved_exp_names.append(exp_name)
+        else:
+            exp_ref_set.add(exp_ref)
+
+    if unresolved_exp_names:
+        raise UnresolvedExpNamesError(unresolved_exp_names)
+    return exp_ref_set
+
+
+def exp_refs_from_rev(scm: "Git", rev: List[str], num: int = 1) -> Set["ExpRefInfo"]:
+    exp_ref_set = set()
+    rev_dict = iter_revs(scm, rev, num)
+    rev_set = set(rev_dict.keys())
+    ref_info_dict = exp_refs_by_baseline(scm, rev_set)
+    for _, ref_info_list in ref_info_dict.items():
+        exp_ref_set.update(ref_info_list)
+    return exp_ref_set
+
+
 @locked
 @scm_context
-def push(  # noqa: C901
+def push(
     repo: "Repo",
     git_remote: str,
-    exp_names: Union[Iterable[str], str],
+    exp_names: Optional[Union[List[str], str]] = None,
     all_commits: bool = False,
-    rev: Optional[str] = None,
+    rev: Optional[Union[List[str], str]] = None,
     num: int = 1,
     force: bool = False,
     push_cache: bool = False,
@@ -85,29 +109,13 @@ def push(  # noqa: C901
     assert isinstance(repo.scm, Git)
     if all_commits:
         exp_ref_set.update(exp_refs(repo.scm))
-
+    if exp_names:
+        exp_ref_set.update(exp_refs_from_names(repo.scm, ensure_list(exp_names)))
     else:
-        if exp_names:
-            if isinstance(exp_names, str):
-                exp_names = [exp_names]
-            exp_ref_dict = resolve_name(repo.scm, exp_names)
-
-            unresolved_exp_names = []
-            for exp_name, exp_ref in exp_ref_dict.items():
-                if exp_ref is None:
-                    unresolved_exp_names.append(exp_name)
-                else:
-                    exp_ref_set.add(exp_ref)
-
-            if unresolved_exp_names:
-                raise UnresolvedExpNamesError(unresolved_exp_names)
-
-        if rev:
-            rev_dict = iter_revs(repo.scm, [rev], num)
-            rev_set = set(rev_dict.keys())
-            ref_info_dict = exp_refs_by_baseline(repo.scm, rev_set)
-            for _, ref_info_list in ref_info_dict.items():
-                exp_ref_set.update(ref_info_list)
+        rev = rev or "HEAD"
+        if isinstance(rev, str):
+            rev = [rev]
+        exp_ref_set.update(exp_refs_from_rev(repo.scm, rev, num=num))
 
     push_result = _push(repo, git_remote, exp_ref_set, force)
 
@@ -120,15 +128,20 @@ def push(  # noqa: C901
     pushed_refs_info = (
         push_result[SyncStatus.UP_TO_DATE] + push_result[SyncStatus.SUCCESS]
     )
+
+    e = None
     if push_cache:
         try:
             result["uploaded"] = _push_cache(repo, pushed_refs_info, **kwargs)
         except Exception as exc:  # noqa: BLE001, pylint: disable=broad-except
-            raise UploadError("failed to push cache", result) from exc
+            e = exc
 
     pushed_refs = [str(r) for r in pushed_refs_info]
-    url = notify_refs_to_studio(repo, git_remote, pushed=pushed_refs)
-    return {**result, "url": url}
+    result["url"] = notify_refs_to_studio(repo, git_remote, pushed=pushed_refs)
+
+    if e:
+        raise UploadError("failed to push cache", result) from e
+    return result
 
 
 def _push(

dvc/repo/experiments/queue/base.py

@@ -17,15 +17,13 @@ from typing import (
     Union,
 )
 
-from dvc_studio_client.env import STUDIO_REPO_URL
-from dvc_studio_client.post_live_metrics import get_studio_repo_url
+from dvc_studio_client.post_live_metrics import get_studio_config
 from funcy import retry
 
 from dvc.dependency import ParamsDependency
-from dvc.env import DVC_EXP_BASELINE_REV, DVC_EXP_NAME, DVCLIVE_RESUME
-from dvc.exceptions import DvcException
+from dvc.env import DVC_EXP_BASELINE_REV, DVC_EXP_NAME
 from dvc.lock import LockError
-from dvc.repo.experiments.exceptions import CheckpointExistsError, ExperimentExistsError
+from dvc.repo.experiments.exceptions import ExperimentExistsError
 from dvc.repo.experiments.executor.base import BaseExecutor
 from dvc.repo.experiments.executor.local import WorkspaceExecutor
 from dvc.repo.experiments.refs import ExpRefInfo
@@ -33,12 +31,11 @@ from dvc.repo.experiments.stash import ExpStash, ExpStashEntry
 from dvc.repo.experiments.utils import (
     EXEC_PID_DIR,
     EXEC_TMP_DIR,
-    exp_refs_by_rev,
     get_exp_rwlock,
     get_random_exp_name,
 )
-from dvc.ui import ui
 from dvc.utils.objects import cached_property
+from dvc.utils.studio import config_to_env
 
 from .utils import get_remote_executor_refs
 
@@ -46,6 +43,7 @@ if TYPE_CHECKING:
     from dvc.repo import Repo
     from dvc.repo.experiments import Experiments
     from dvc.repo.experiments.executor.base import ExecutorResult
+    from dvc.repo.experiments.serialize import ExpRange
     from dvc.scm import Git
 
 logger = logging.getLogger(__name__)
@@ -253,7 +251,7 @@ class BaseStashQueue(ABC):
 
     @abstractmethod
     def reproduce(
-        self, copy_paths: Optional[List[str]] = None
+        self, copy_paths: Optional[List[str]] = None, message: Optional[str] = None
     ) -> Mapping[str, Mapping[str, str]]:
         """Reproduce queued experiments sequentially."""
 
@@ -299,11 +297,10 @@ class BaseStashQueue(ABC):
                 output.
         """
 
-    def _stash_exp(  # noqa: PLR0915, C901
+    def _stash_exp(  # noqa: C901
         self,
         *args,
         params: Optional[Dict[str, List[str]]] = None,
-        resume_rev: Optional[str] = None,
         baseline_rev: Optional[str] = None,
         branch: Optional[str] = None,
         name: Optional[str] = None,
@@ -314,7 +311,6 @@ class BaseStashQueue(ABC):
         Args:
             params: Dict mapping paths to `Hydra Override`_ patterns,
                 provided via `exp run --set-param`.
-            resume_rev: Optional checkpoint resume rev.
             baseline_rev: Optional baseline rev for this experiment, defaults
                 to the current SCM rev.
             branch: Optional experiment branch name. If specified, the
@@ -337,17 +333,6 @@ class BaseStashQueue(ABC):
                     if workspace:
                         self.stash.apply(workspace)
 
-                    if resume_rev:
-                        # move HEAD to the resume rev so that the stashed diff
-                        # only contains changes relative to resume rev
-                        stash_head = resume_rev
-                        self.scm.set_ref(
-                            "HEAD",
-                            resume_rev,
-                            message=f"dvc: resume from HEAD {resume_rev[:7]}",
-                        )
-                        self.scm.reset()
-
                     # update experiment params from command line
                     if params:
                         self._update_params(params)
@@ -356,60 +341,6 @@ class BaseStashQueue(ABC):
                     # & tempdir runs
                     self._stash_commit_deps(*args, **kwargs)
 
-                    if resume_rev:
-                        if branch:
-                            branch_name = ExpRefInfo.from_ref(branch).name
-                        else:
-                            branch_name = f"{resume_rev[:7]}"
-                        if self.scm.is_dirty(untracked_files=False):
-                            ui.write(
-                                (
-                                    "Modified checkpoint experiment based on "
-                                    f"'{branch_name}' will be created"
-                                ),
-                            )
-                            branch = None
-                        elif not branch or self.scm.get_ref(branch) != resume_rev:
-                            err_msg = [
-                                "Nothing to do for unchanged checkpoint "
-                                f"'{resume_rev[:7]}'. "
-                            ]
-                            if branch:
-                                err_msg.append(
-                                    "To resume from the head of this "
-                                    "experiment, use "
-                                    f"'dvc exp apply {branch_name}'."
-                                )
-                            else:
-                                names = [
-                                    ref_info.name
-                                    for ref_info in exp_refs_by_rev(
-                                        self.scm, resume_rev
-                                    )
-                                ]
-                                if len(names) > 3:
-                                    names[3:] = [f"... ({len(names) - 3} more)"]
-                                err_msg.append(
-                                    "To resume an experiment containing this "
-                                    "checkpoint, apply one of these heads:\n"
-                                    "\t{}".format(", ".join(names))
-                                )
-                            raise DvcException("".join(err_msg))
-                        else:
-                            ui.write(
-                                "Existing checkpoint experiment "
-                                f"'{branch_name}' will be resumed"
-                            )
-                        if name:
-                            logger.warning(
-                                (
-                                    "Ignoring option '--name %s' for resumed "
-                                    "experiment. Existing experiment name will"
-                                    "be preserved instead."
-                                ),
-                                name,
-                            )
-
                     # save additional repro command line arguments
                     run_env = {
                         DVC_EXP_BASELINE_REV: baseline_rev,
@@ -417,14 +348,13 @@ class BaseStashQueue(ABC):
                     if not name:
                         name = get_random_exp_name(self.scm, baseline_rev)
                     run_env[DVC_EXP_NAME] = name
-                    if resume_rev:
-                        run_env[DVCLIVE_RESUME] = "1"
-                    studio_repo_url = get_studio_repo_url()
-                    if studio_repo_url is not None:
-                        run_env[STUDIO_REPO_URL] = studio_repo_url
 
+                    # save studio config to read later by dvc and dvclive
+                    studio_config = get_studio_config(
+                        dvc_studio_config=self.repo.config.get("studio")
+                    )
+                    run_env = {**config_to_env(studio_config), **run_env}
                     self._pack_args(*args, run_env=run_env, **kwargs)
-
                     # save experiment as a stash commit
                     msg = self._stash_msg(
                         stash_head,
@@ -443,12 +373,6 @@ class BaseStashQueue(ABC):
                         baseline_rev[:7],
                     )
                 finally:
-                    if resume_rev:
-                        # NOTE: this set_ref + reset() is equivalent to
-                        # `git reset orig_head` (our SCM reset() only operates
-                        # on HEAD rather than any arbitrary commit)
-                        self.scm.set_ref("HEAD", orig_head, message="dvc: restore HEAD")
-                        self.scm.reset()
                     # Revert any of our changes before prior unstashing
                     self.scm.reset(hard=True)
 
@@ -631,10 +555,8 @@ class BaseStashQueue(ABC):
     ) -> Dict[str, str]:
         results = {}
 
-        def on_diverged(ref: str, checkpoint: bool):
+        def on_diverged(ref: str):
             ref_info = ExpRefInfo.from_ref(ref)
-            if checkpoint:
-                raise CheckpointExistsError(ref_info.name)
             raise ExperimentExistsError(ref_info.name)
 
         refs = get_remote_executor_refs(exp.scm, executor.git_url)
@@ -728,9 +650,79 @@ class BaseStashQueue(ABC):
             )
 
     @abstractmethod
-    def get_running_exps(self, fetch_refs: bool = True) -> Dict[str, Dict]:
-        """Get the execution info of the currently running experiments
+    def collect_active_data(
+        self,
+        baseline_revs: Optional[Collection[str]],
+        fetch_refs: bool = False,
+        **kwargs,
+    ) -> Dict[str, List["ExpRange"]]:
+        """Collect data for active (running) experiments.
 
         Args:
-            fetch_ref (bool): fetch completed checkpoints or not.
+            baseline_revs: Optional resolved baseline Git SHAs. If set, only experiments
+                derived from the specified revisions will be collected. Defaults to
+                collecting all experiments.
+            fetch_refs: Whether or not to fetch completed checkpoint commits from Git
+                remote.
+
+        Returns:
+            Dict mapping baseline revision to list of active experiments.
         """
+
+    @abstractmethod
+    def collect_queued_data(
+        self,
+        baseline_revs: Optional[Collection[str]],
+        **kwargs,
+    ) -> Dict[str, List["ExpRange"]]:
+        """Collect data for queued experiments.
+
+        Args:
+            baseline_revs: Optional resolved baseline Git SHAs. If set, only experiments
+                derived from the specified revisions will be collected. Defaults to
+                collecting all experiments.
+
+        Returns:
+            Dict mapping baseline revision to list of queued experiments.
+        """
+
+    @abstractmethod
+    def collect_failed_data(
+        self,
+        baseline_revs: Optional[Collection[str]],
+        **kwargs,
+    ) -> Dict[str, List["ExpRange"]]:
+        """Collect data for failed experiments.
+
+        Args:
+            baseline_revs: Optional resolved baseline Git SHAs. If set, only experiments
+                derived from the specified revisions will be collected. Defaults to
+                collecting all experiments.
+
+        Returns:
+            Dict mapping baseline revision to list of queued experiments.
+        """
+
+    def active_repo(self, name: str) -> "Repo":
+        """Return a Repo for the specified active experiment if it exists."""
+        from dvc.exceptions import DvcException
+        from dvc.repo import Repo
+        from dvc.repo.experiments.exceptions import (
+            ExpNotStartedError,
+            InvalidExpRevError,
+        )
+        from dvc.repo.experiments.executor.base import ExecutorInfo, TaskStatus
+
+        for entry in self.iter_active():
+            if entry.name != name:
+                continue
+            infofile = self.get_infofile_path(entry.stash_rev)
+            executor_info = ExecutorInfo.load_json(infofile)
+            if executor_info.status < TaskStatus.RUNNING:
+                raise ExpNotStartedError(name)
+            dvc_root = os.path.join(executor_info.root_dir, executor_info.dvc_dir)
+            try:
+                return Repo(dvc_root)
+            except (FileNotFoundError, DvcException) as exc:
+                raise InvalidExpRevError(name) from exc
+        raise InvalidExpRevError(name)

dvc/repo/experiments/queue/celery.py

@@ -2,6 +2,7 @@ import hashlib
 import locale
 import logging
 import os
+from collections import defaultdict
 from typing import (
     TYPE_CHECKING,
     Collection,
@@ -40,6 +41,7 @@ if TYPE_CHECKING:
 
     from dvc.repo.experiments.executor.base import ExecutorResult
     from dvc.repo.experiments.refs import ExpRefInfo
+    from dvc.repo.experiments.serialize import ExpRange
     from dvc_task.app import FSApp
     from dvc_task.proc.manager import ProcessManager
     from dvc_task.worker import TemporaryWorker
@@ -123,6 +125,7 @@ class LocalCeleryQueue(BaseStashQueue):
             without_mingle=True,
             without_gossip=True,
             timeout=10,
+            loglevel="debug" if logger.getEffectiveLevel() <= logging.DEBUG else "info",
         )
 
     def _spawn_worker(self, num: int = 1):
@@ -141,6 +144,8 @@ class LocalCeleryQueue(BaseStashQueue):
         if num == 1:
             # automatically run celery cleanup when primary worker shuts down
             cmd.append("--clean")
+        if logger.getEffectiveLevel() <= logging.DEBUG:
+            cmd.append("-v")
         name = f"dvc-exp-worker-{num}"
 
         logger.debug("start a new worker: %s, node: %s", name, node_name)
@@ -175,12 +180,18 @@ class LocalCeleryQueue(BaseStashQueue):
         return started
 
     def put(
-        self, *args, copy_paths: Optional[List[str]] = None, **kwargs
+        self,
+        *args,
+        copy_paths: Optional[List[str]] = None,
+        message: Optional[str] = None,
+        **kwargs,
     ) -> QueueEntry:
         """Stash an experiment and add it to the queue."""
         with get_exp_rwlock(self.repo, writes=["workspace", CELERY_STASH]):
             entry = self._stash_exp(*args, **kwargs)
-        self.celery.signature(run_exp.s(entry.asdict(), copy_paths=copy_paths)).delay()
+        self.celery.signature(
+            run_exp.s(entry.asdict(), copy_paths=copy_paths, message=message)
+        ).delay()
         return entry
 
     # NOTE: Queue consumption should not be done directly. Celery worker(s)
@@ -198,7 +209,9 @@ class LocalCeleryQueue(BaseStashQueue):
                 continue
             args, kwargs, _embed = msg.decode()
             entry_dict = kwargs.get("entry_dict", args[0])
-            logger.debug("Found queued task %s", entry_dict["stash_rev"])
+            logger.trace(  # type: ignore[attr-defined]
+                "Found queued task %s", entry_dict["stash_rev"]
+            )
             yield _MessageEntry(msg, QueueEntry.from_dict(entry_dict))
 
     def _iter_processed(self) -> Generator[_MessageEntry, None, None]:
@@ -214,7 +227,9 @@ class LocalCeleryQueue(BaseStashQueue):
             task_id = msg.headers["id"]
             result: AsyncResult = AsyncResult(task_id)
             if not result.ready():
-                logger.debug("Found active task %s", entry.stash_rev)
+                logger.trace(  # type: ignore[attr-defined]
+                    "Found active task %s", entry.stash_rev
+                )
                 yield _TaskEntry(result, entry)
 
     def _iter_done_tasks(self) -> Generator[_TaskEntry, None, None]:
@@ -222,7 +237,9 @@ class LocalCeleryQueue(BaseStashQueue):
             task_id = msg.headers["id"]
             result: AsyncResult = AsyncResult(task_id)
             if result.ready():
-                logger.debug("Found done task %s", entry.stash_rev)
+                logger.trace(  # type: ignore[attr-defined]
+                    "Found done task %s", entry.stash_rev
+                )
                 yield _TaskEntry(result, entry)
 
     def iter_active(self) -> Generator[QueueEntry, None, None]:
@@ -253,7 +270,7 @@ class LocalCeleryQueue(BaseStashQueue):
                 yield QueueDoneResult(queue_entry, exp_result)
 
     def reproduce(
-        self, copy_paths: Optional[List[str]] = None
+        self, copy_paths: Optional[List[str]] = None, message: Optional[str] = None
     ) -> Mapping[str, Mapping[str, str]]:
         raise NotImplementedError
 
@@ -472,19 +489,6 @@ class LocalCeleryQueue(BaseStashQueue):
 
         return celery_remove(self, *args, **kwargs)
 
-    def get_running_exps(self, fetch_refs: bool = True) -> Dict[str, Dict]:
-        """Get the execution info of the currently running experiments
-
-        Args:
-            fetch_ref (bool): fetch completed checkpoints or not.
-        """
-        result: Dict[str, Dict] = {}
-        for entry in self.iter_active():
-            result.update(
-                fetch_running_exp_from_temp_dir(self, entry.stash_rev, fetch_refs)
-            )
-        return result
-
     def get_ref_and_entry_by_names(
         self,
         exp_names: Union[str, List[str]],
@@ -512,3 +516,124 @@ class LocalCeleryQueue(BaseStashQueue):
             queue_entry = None if git_remote else queue_entry_match[exp_name]
             results[exp_name] = ExpRefAndQueueEntry(exp_ref, queue_entry)
         return results
+
+    def collect_active_data(
+        self,
+        baseline_revs: Optional[Collection[str]],
+        fetch_refs: bool = False,
+        **kwargs,
+    ) -> Dict[str, List["ExpRange"]]:
+        from dvc.repo import Repo
+        from dvc.repo.experiments.collect import collect_exec_branch
+        from dvc.repo.experiments.serialize import (
+            ExpExecutor,
+            ExpRange,
+            LocalExpExecutor,
+        )
+
+        result: Dict[str, List[ExpRange]] = defaultdict(list)
+        for entry in self.iter_active():
+            if baseline_revs and entry.baseline_rev not in baseline_revs:
+                continue
+            if fetch_refs:
+                fetch_running_exp_from_temp_dir(self, entry.stash_rev, fetch_refs)
+            proc_info = self.proc.get(entry.stash_rev)
+            executor_info = self._load_info(entry.stash_rev)
+            if proc_info:
+                local_exec: Optional[LocalExpExecutor] = LocalExpExecutor(
+                    root=executor_info.root_dir,
+                    log=proc_info.stdout,
+                    pid=proc_info.pid,
+                    task_id=entry.stash_rev,
+                )
+            else:
+                local_exec = None
+            dvc_root = os.path.join(executor_info.root_dir, executor_info.dvc_dir)
+            with Repo(dvc_root) as exec_repo:
+                kwargs["cache"] = self.repo.experiments.cache
+                exps = list(
+                    collect_exec_branch(exec_repo, executor_info.baseline_rev, **kwargs)
+                )
+            exps[0].rev = entry.stash_rev
+            exps[0].name = entry.name
+            result[entry.baseline_rev].append(
+                ExpRange(
+                    exps,
+                    executor=ExpExecutor(
+                        "running",
+                        name=executor_info.location,
+                        local=local_exec,
+                    ),
+                    name=entry.name,
+                )
+            )
+        return result
+
+    def collect_queued_data(
+        self,
+        baseline_revs: Optional[Collection[str]],
+        **kwargs,
+    ) -> Dict[str, List["ExpRange"]]:
+        from dvc.repo.experiments.collect import collect_rev
+        from dvc.repo.experiments.serialize import (
+            ExpExecutor,
+            ExpRange,
+            LocalExpExecutor,
+        )
+
+        result: Dict[str, List[ExpRange]] = defaultdict(list)
+        for entry in self.iter_queued():
+            if baseline_revs and entry.baseline_rev not in baseline_revs:
+                continue
+            exp = collect_rev(self.repo, entry.stash_rev, **kwargs)
+            exp.name = entry.name
+            local_exec: Optional[LocalExpExecutor] = LocalExpExecutor(
+                task_id=entry.stash_rev,
+            )
+            result[entry.baseline_rev].append(
+                ExpRange(
+                    [exp],
+                    executor=ExpExecutor("queued", name="dvc-task", local=local_exec),
+                    name=entry.name,
+                )
+            )
+        return result
+
+    def collect_failed_data(
+        self,
+        baseline_revs: Optional[Collection[str]],
+        **kwargs,
+    ) -> Dict[str, List["ExpRange"]]:
+        from dvc.repo.experiments.collect import collect_rev
+        from dvc.repo.experiments.serialize import (
+            ExpExecutor,
+            ExpRange,
+            LocalExpExecutor,
+            SerializableError,
+        )
+
+        result: Dict[str, List[ExpRange]] = defaultdict(list)
+        for entry, _ in self.iter_failed():
+            if baseline_revs and entry.baseline_rev not in baseline_revs:
+                continue
+            proc_info = self.proc.get(entry.stash_rev)
+            if proc_info:
+                local_exec: Optional[LocalExpExecutor] = LocalExpExecutor(
+                    log=proc_info.stdout,
+                    pid=proc_info.pid,
+                    returncode=proc_info.returncode,
+                    task_id=entry.stash_rev,
+                )
+            else:
+                local_exec = None
+            exp = collect_rev(self.repo, entry.stash_rev, **kwargs)
+            exp.name = entry.name
+            exp.error = SerializableError("Experiment run failed")
+            result[entry.baseline_rev].append(
+                ExpRange(
+                    [exp],
+                    executor=ExpExecutor("failed", local=local_exec),
+                    name=entry.name,
+                )
+            )
+        return result

dvc/repo/experiments/queue/tasks.py

@@ -91,7 +91,11 @@ def cleanup_exp(executor: TempDirExecutor, infofile: str) -> None:
 
 
 @shared_task
-def run_exp(entry_dict: Dict[str, Any], copy_paths: Optional[List[str]] = None) -> None:
+def run_exp(
+    entry_dict: Dict[str, Any],
+    copy_paths: Optional[List[str]] = None,
+    message: Optional[str] = None,
+) -> None:
     """Run a full experiment.
 
     Experiment subtasks are executed inline as one atomic operation.
@@ -111,6 +115,8 @@ def run_exp(entry_dict: Dict[str, Any], copy_paths: Optional[List[str]] = None)
         if copy_paths:
             for path in copy_paths:
                 cmd.extend(["--copy-paths", path])
+        if message:
+            cmd.extend(["--message", message])
         proc_dict = queue.proc.run_signature(cmd, name=entry.stash_rev)()
         collect_exp.s(proc_dict, entry_dict)()
     finally:

dvc/repo/experiments/queue/tempdir.py

@@ -1,7 +1,7 @@
 import logging
 import os
 from collections import defaultdict
-from typing import TYPE_CHECKING, Dict, Generator, List, Optional
+from typing import TYPE_CHECKING, Collection, Dict, Generator, List, Optional
 
 from funcy import first
 
@@ -19,6 +19,7 @@ from .workspace import WorkspaceQueue
 if TYPE_CHECKING:
     from dvc.repo.experiments import Experiments
     from dvc.repo.experiments.executor.base import BaseExecutor, ExecutorResult
+    from dvc.repo.experiments.serialize import ExpRange
     from dvc_task.proc.manager import ProcessManager
 
 logger = logging.getLogger(__name__)
@@ -96,10 +97,9 @@ class TempDirQueue(WorkspaceQueue):
         entry: QueueEntry,
         executor: "BaseExecutor",
         copy_paths: Optional[List[str]] = None,
+        message: Optional[str] = None,
         **kwargs,
     ) -> Dict[str, Dict[str, str]]:
-        from dvc.stage.monitor import CheckpointKilledError
-
         results: Dict[str, Dict[str, str]] = defaultdict(dict)
         exec_name = self._EXEC_NAME or entry.stash_rev
         infofile = self.get_infofile_path(exec_name)
@@ -112,6 +112,7 @@ class TempDirQueue(WorkspaceQueue):
                 log_level=logger.getEffectiveLevel(),
                 log_errors=True,
                 copy_paths=copy_paths,
+                message=message,
             )
             if not exec_result.exp_hash:
                 raise DvcException(f"Failed to reproduce experiment '{rev[:7]}'")
@@ -119,12 +120,6 @@ class TempDirQueue(WorkspaceQueue):
                 results[rev].update(
                     self.collect_executor(self.repo.experiments, executor, exec_result)
                 )
-        except CheckpointKilledError:
-            results[rev].update(
-                self.collect_executor(self.repo.experiments, executor, exec_result)
-            )
-
-            return results
         except DvcException:
             raise
         except Exception as exc:  # noqa: BLE001
@@ -141,10 +136,53 @@ class TempDirQueue(WorkspaceQueue):
     ) -> Dict[str, str]:
         return BaseStashQueue.collect_executor(exp, executor, exec_result)
 
-    def get_running_exps(self, fetch_refs: bool = True) -> Dict[str, Dict]:
-        result: Dict[str, Dict] = {}
+    def collect_active_data(
+        self,
+        baseline_revs: Optional[Collection[str]],
+        fetch_refs: bool = False,
+        **kwargs,
+    ) -> Dict[str, List["ExpRange"]]:
+        from dvc.repo import Repo
+        from dvc.repo.experiments.collect import collect_exec_branch
+        from dvc.repo.experiments.serialize import (
+            ExpExecutor,
+            ExpRange,
+            LocalExpExecutor,
+        )
+
+        result: Dict[str, List[ExpRange]] = defaultdict(list)
         for entry in self.iter_active():
-            result.update(
+            if baseline_revs and entry.baseline_rev not in baseline_revs:
+                continue
+            if fetch_refs:
                 fetch_running_exp_from_temp_dir(self, entry.stash_rev, fetch_refs)
+            proc_info = self.proc.get(entry.stash_rev)
+            infofile = self.get_infofile_path(entry.stash_rev)
+            executor_info = ExecutorInfo.load_json(infofile)
+            if proc_info:
+                local_exec: Optional[LocalExpExecutor] = LocalExpExecutor(
+                    root=executor_info.root_dir,
+                    log=proc_info.stdout,
+                    pid=proc_info.pid,
+                )
+            else:
+                local_exec = None
+            dvc_root = os.path.join(executor_info.root_dir, executor_info.dvc_dir)
+            with Repo(dvc_root) as repo:
+                exps = list(
+                    collect_exec_branch(repo, executor_info.baseline_rev, **kwargs)
+                )
+            exps[0].rev = entry.stash_rev
+            exps[0].name = entry.name
+            result[entry.baseline_rev].append(
+                ExpRange(
+                    exps,
+                    executor=ExpExecutor(
+                        "running",
+                        name=executor_info.location,
+                        local=local_exec,
+                    ),
+                    name=entry.name,
+                )
             )
         return result

dvc/repo/experiments/queue/utils.py

@@ -4,12 +4,7 @@ from typing import TYPE_CHECKING, Dict, List
 from scmrepo.exceptions import SCMError
 
 from dvc.repo.experiments.executor.base import ExecutorInfo, TaskStatus
-from dvc.repo.experiments.refs import (
-    EXEC_CHECKPOINT,
-    EXEC_NAMESPACE,
-    EXPS_NAMESPACE,
-    EXPS_STASH,
-)
+from dvc.repo.experiments.refs import EXEC_NAMESPACE, EXPS_NAMESPACE, EXPS_STASH
 from dvc.repo.experiments.utils import get_exp_rwlock, iter_remote_refs
 
 logger = logging.getLogger(__name__)
@@ -33,9 +28,7 @@ def get_remote_executor_refs(scm: "Git", remote_url: str) -> List[str]:
         remote_url,
         base=EXPS_NAMESPACE,
     ):
-        if ref == EXEC_CHECKPOINT or (
-            not ref.startswith(EXEC_NAMESPACE) and ref != EXPS_STASH
-        ):
+        if not ref.startswith(EXEC_NAMESPACE) and ref != EXPS_STASH:
             refs.append(ref)
     return refs
 
@@ -67,7 +60,7 @@ def fetch_running_exp_from_temp_dir(
         result[rev] = info.asdict()
         if info.git_url and fetch_refs and info.status > TaskStatus.PREPARING:
 
-            def on_diverged(_ref: str, _checkpoint: bool):
+            def on_diverged(_ref: str):
                 return True
 
             executor = TempDirExecutor.from_info(info)

dvc/repo/experiments/queue/workspace.py

@@ -1,28 +1,27 @@
 import json
 import logging
+import os
 from collections import defaultdict
 from typing import TYPE_CHECKING, Collection, Dict, Generator, List, Optional
 
 import psutil
 from funcy import first
-from voluptuous import Invalid
 
 from dvc.exceptions import DvcException
-from dvc.lock import make_lock
 from dvc.repo.experiments.exceptions import ExpQueueEmptyError
 from dvc.repo.experiments.executor.base import ExecutorInfo, TaskStatus
 from dvc.repo.experiments.executor.local import WorkspaceExecutor
 from dvc.repo.experiments.refs import EXEC_BRANCH, WORKSPACE_STASH
 from dvc.repo.experiments.utils import get_exp_rwlock
-from dvc.rwlock import RWLOCK_FILE, RWLOCK_LOCK, SCHEMA
-from dvc.utils import relpath
 from dvc.utils.fs import remove
+from dvc.utils.serialize import load_json
 
 from .base import BaseStashQueue, QueueEntry, QueueGetResult
 
 if TYPE_CHECKING:
     from dvc.repo.experiments import Experiments
     from dvc.repo.experiments.executor.base import BaseExecutor, ExecutorResult
+    from dvc.repo.experiments.serialize import ExpRange
 
     from .base import QueueDoneResult
 
@@ -83,14 +82,16 @@ class WorkspaceQueue(BaseStashQueue):
         raise NotImplementedError
 
     def reproduce(
-        self, copy_paths: Optional[List[str]] = None
+        self, copy_paths: Optional[List[str]] = None, message: Optional[str] = None
     ) -> Dict[str, Dict[str, str]]:
         results: Dict[str, Dict[str, str]] = defaultdict(dict)
         try:
             while True:
                 entry, executor = self.get()
                 results.update(
-                    self._reproduce_entry(entry, executor, copy_paths=copy_paths)
+                    self._reproduce_entry(
+                        entry, executor, copy_paths=copy_paths, message=message
+                    )
                 )
         except ExpQueueEmptyError:
             pass
@@ -100,10 +101,14 @@ class WorkspaceQueue(BaseStashQueue):
         self, entry: QueueEntry, executor: "BaseExecutor", **kwargs
     ) -> Dict[str, Dict[str, str]]:
         kwargs.pop("copy_paths", None)
-        from dvc.stage.monitor import CheckpointKilledError
+        from dvc_task.proc.process import ProcessInfo
 
         results: Dict[str, Dict[str, str]] = defaultdict(dict)
         exec_name = self._EXEC_NAME or entry.stash_rev
+        proc_info = ProcessInfo(os.getpid(), None, None, None, None)
+        proc_info_path = self._proc_info_path(exec_name)
+        os.makedirs(os.path.dirname(proc_info_path), exist_ok=True)
+        proc_info.dump(proc_info_path)
         infofile = self.get_infofile_path(exec_name)
         try:
             rev = entry.stash_rev
@@ -113,6 +118,7 @@ class WorkspaceQueue(BaseStashQueue):
                 infofile=infofile,
                 log_level=logger.getEffectiveLevel(),
                 log_errors=not isinstance(executor, WorkspaceExecutor),
+                message=kwargs.get("message"),
             )
             if not exec_result.exp_hash:
                 raise DvcException(f"Failed to reproduce experiment '{rev[:7]}'")
@@ -120,17 +126,35 @@ class WorkspaceQueue(BaseStashQueue):
                 results[rev].update(
                     self.collect_executor(self.repo.experiments, executor, exec_result)
                 )
-        except CheckpointKilledError:
-            # Checkpoint errors have already been logged
-            return {}
         except DvcException:
             raise
         except Exception as exc:  # noqa: BLE001
             raise DvcException(f"Failed to reproduce experiment '{rev[:7]}'") from exc
         finally:
             executor.cleanup(infofile)
+            remove(self._proc_info_path(exec_name))
         return results
 
+    def _proc_info_path(self, name: str) -> str:
+        return os.path.join(self.pid_dir, name, f"{name}.json")
+
+    @property
+    def _active_pid(self) -> Optional[int]:
+        from dvc_task.proc.process import ProcessInfo
+
+        assert self._EXEC_NAME
+        name = self._EXEC_NAME
+        try:
+            proc_info = ProcessInfo.load(self._proc_info_path(name))
+            pid = proc_info.pid
+            if psutil.pid_exists(pid):
+                return pid
+            logger.debug("Workspace exec PID '%d' no longer exists, removing.", pid)
+            remove(self._proc_info_path(name))
+        except (FileNotFoundError, json.JSONDecodeError):
+            pass
+        return None
+
     @staticmethod
     def collect_executor(  # pylint: disable=unused-argument
         exp: "Experiments",
@@ -163,87 +187,71 @@ class WorkspaceQueue(BaseStashQueue):
     ):
         raise NotImplementedError
 
-    def check_rwlock(
-        self,
-        hardlink: bool = False,
-        autocorrect: bool = False,
-    ) -> bool:
-        """Check and autocorrect the RWLock status for file paths.
-
-        Args:
-            hardlink (bool): use hardlink lock to guard rwlock file when on
-                            edit.
-            autocorrect (bool): autocorrect corrupted rwlock file.
-
-        Return:
-            (bool): if the pid alive.
-        """
-        path = self.repo.fs.path.join(self.repo.tmp_dir, RWLOCK_FILE)
-
-        rwlock_guard = make_lock(
-            self.repo.fs.path.join(self.repo.tmp_dir, RWLOCK_LOCK),
-            tmp_dir=self.repo.tmp_dir,
-            hardlink_lock=hardlink,
-        )
-        with rwlock_guard:
-            try:
-                with self.repo.fs.open(path, encoding="utf-8") as fobj:
-                    lock: Dict[str, List[Dict]] = SCHEMA(json.load(fobj))
-                file_path = first(lock["read"])
-                if not file_path:
-                    return False
-                lock_info = first(lock["read"][file_path])
-                pid = int(lock_info["pid"])
-                if psutil.pid_exists(pid):
-                    return True
-                cmd = lock_info["cmd"]
-                logger.warning(
-                    "Process '%s' with (Pid %s), in RWLock-file '%s' had been killed.",
-                    cmd,
-                    pid,
-                    relpath(path),
-                )
-            except FileNotFoundError:
-                return False
-            except json.JSONDecodeError:
-                logger.warning(
-                    "Unable to read RWLock-file '%s'. JSON structure is corrupted",
-                    relpath(path),
-                )
-            except Invalid:
-                logger.warning("RWLock-file '%s' format error.", relpath(path))
-            if autocorrect:
-                logger.warning("Delete corrupted RWLock-file '%s'", relpath(path))
-                remove(path)
-            return False
-
-    def get_running_exps(
-        self,
-        fetch_refs: bool = True,  # noqa: ARG002
-    ) -> Dict[str, Dict]:
-        from dvc.utils.serialize import load_json
-
+    def get_running_exp(self) -> Optional[str]:
+        """Return the name of the exp running in workspace (if it exists)."""
         assert self._EXEC_NAME
-        result: Dict[str, Dict] = {}
-
-        if not self.check_rwlock(autocorrect=True):
-            return result
+        if self._active_pid is None:
+            return None
 
         infofile = self.get_infofile_path(self._EXEC_NAME)
+        try:
+            info = ExecutorInfo.from_dict(load_json(infofile))
+        except OSError:
+            return None
+        return info.name
 
+    def collect_active_data(
+        self,
+        baseline_revs: Optional[Collection[str]],
+        fetch_refs: bool = False,  # noqa: ARG002
+        **kwargs,
+    ) -> Dict[str, List["ExpRange"]]:
+        from dvc.repo.experiments.collect import collect_exec_branch
+        from dvc.repo.experiments.serialize import (
+            ExpExecutor,
+            ExpRange,
+            LocalExpExecutor,
+        )
+
+        result: Dict[str, List[ExpRange]] = defaultdict(list)
+        pid = self._active_pid
+        if pid is None:
+            return result
+
+        assert self._EXEC_NAME
+        infofile = self.get_infofile_path(self._EXEC_NAME)
         try:
             info = ExecutorInfo.from_dict(load_json(infofile))
         except OSError:
             return result
 
-        if info.status < TaskStatus.FAILED:
-            # If we are appending to a checkpoint branch in a workspace
-            # run, show the latest checkpoint as running.
-            if info.status == TaskStatus.SUCCESS:
-                return result
-            last_rev = self.scm.get_ref(EXEC_BRANCH)
-            if last_rev:
-                result[last_rev] = info.asdict()
-            else:
-                result[self._EXEC_NAME] = info.asdict()
+        if (
+            (not baseline_revs or info.baseline_rev in baseline_revs)
+            and info.status < TaskStatus.FAILED
+            and info.status != TaskStatus.SUCCESS
+        ):
+            local_exec = LocalExpExecutor(root=info.root_dir, pid=pid)
+            exps = list(collect_exec_branch(self.repo, info.baseline_rev, **kwargs))
+            exps[0].name = info.name
+            result[info.baseline_rev] = [
+                ExpRange(
+                    exps,
+                    executor=ExpExecutor("running", name="workspace", local=local_exec),
+                    name=info.name,
+                )
+            ]
         return result
+
+    def collect_queued_data(
+        self,
+        baseline_revs: Optional[Collection[str]],
+        **kwargs,
+    ) -> Dict[str, List["ExpRange"]]:
+        raise NotImplementedError
+
+    def collect_failed_data(
+        self,
+        baseline_revs: Optional[Collection[str]],
+        **kwargs,
+    ) -> Dict[str, List["ExpRange"]]:
+        raise NotImplementedError

dvc/repo/experiments/refs.py

@@ -10,18 +10,23 @@ WORKSPACE_STASH = EXPS_STASH
 APPLY_NAMESPACE = f"{EXPS_NAMESPACE}/apply"
 APPLY_HEAD = f"{APPLY_NAMESPACE}/ORIG_HEAD"
 APPLY_STASH = f"{APPLY_NAMESPACE}/stash"
-CELERY_STASH = f"{EXPS_NAMESPACE}/celery/stash"
-CELERY_FAILED_STASH = f"{EXPS_NAMESPACE}/celery/failed"
+CELERY_NAMESPACE = f"{EXPS_NAMESPACE}/celery"
+CELERY_STASH = f"{CELERY_NAMESPACE}/stash"
+CELERY_FAILED_STASH = f"{CELERY_NAMESPACE}/failed"
 EXEC_NAMESPACE = f"{EXPS_NAMESPACE}/exec"
 EXEC_APPLY = f"{EXEC_NAMESPACE}/EXEC_APPLY"
-EXEC_CHECKPOINT = f"{EXEC_NAMESPACE}/EXEC_CHECKPOINT"
 EXEC_BRANCH = f"{EXEC_NAMESPACE}/EXEC_BRANCH"
 EXEC_BASELINE = f"{EXEC_NAMESPACE}/EXEC_BASELINE"
 EXEC_HEAD = f"{EXEC_NAMESPACE}/EXEC_HEAD"
 EXEC_MERGE = f"{EXEC_NAMESPACE}/EXEC_MERGE"
-EXPS_TEMP = f"{EXPS_NAMESPACE}/temp"
+TEMP_NAMESPACE = f"{EXPS_NAMESPACE}/temp"
 STASHES = {WORKSPACE_STASH, CELERY_STASH}
-ITER_SKIP_NAMESPACES = {APPLY_NAMESPACE, EXEC_NAMESPACE}
+ITER_SKIP_NAMESPACES = {
+    APPLY_NAMESPACE,
+    CELERY_NAMESPACE,
+    EXEC_NAMESPACE,
+    TEMP_NAMESPACE,
+}
 
 
 class ExpRefInfo:

dvc/repo/experiments/remove.py

@@ -24,7 +24,7 @@ logger = logging.getLogger(__name__)
 def remove(  # noqa: C901, PLR0912
     repo: "Repo",
     exp_names: Union[None, str, List[str]] = None,
-    rev: Optional[str] = None,
+    rev: Optional[Union[List[str], str]] = None,
     all_commits: bool = False,
     num: int = 1,
     queue: bool = False,
@@ -60,6 +60,8 @@ def remove(  # noqa: C901, PLR0912
         if remained:
             raise UnresolvedExpNamesError(remained, git_remote=git_remote)
     elif rev:
+        if isinstance(rev, str):
+            rev = [rev]
         exp_ref_dict = _resolve_exp_by_baseline(repo, rev, num, git_remote)
         removed.extend(exp_ref_dict.keys())
         exp_ref_list.extend(exp_ref_dict.values())
@@ -85,14 +87,14 @@ def remove(  # noqa: C901, PLR0912
 
 def _resolve_exp_by_baseline(
     repo: "Repo",
-    rev: str,
+    rev: List[str],
     num: int,
     git_remote: Optional[str] = None,
 ) -> Dict[str, "ExpRefInfo"]:
     assert isinstance(repo.scm, Git)
 
     commit_ref_dict: Dict[str, "ExpRefInfo"] = {}
-    rev_dict = iter_revs(repo.scm, [rev], num)
+    rev_dict = iter_revs(repo.scm, rev, num)
     rev_set = set(rev_dict.keys())
     ref_info_dict = exp_refs_by_baseline(repo.scm, rev_set, git_remote)
     for _, ref_info_list in ref_info_dict.items():

dvc/repo/experiments/run.py

@@ -20,6 +20,7 @@ def run(  # noqa: C901, PLR0912
     tmp_dir: bool = False,
     queue: bool = False,
     copy_paths: Optional[Iterable[str]] = None,
+    message: Optional[str] = None,
     **kwargs,
 ) -> Dict[str, str]:
     """Reproduce the specified targets as an experiment.
@@ -74,6 +75,7 @@ def run(  # noqa: C901, PLR0912
             params=path_overrides,
             tmp_dir=tmp_dir,
             copy_paths=copy_paths,
+            message=message,
             **kwargs,
         )
 
@@ -85,9 +87,6 @@ def run(  # noqa: C901, PLR0912
     else:
         sweeps = [path_overrides]
 
-    if not kwargs.get("checkpoint_resume", None):
-        kwargs["reset"] = True
-
     for idx, sweep_overrides in enumerate(sweeps):
         if hydra_sweep and name_prefix is not None:
             kwargs["name"] = f"{name_prefix}-{idx+1}"
@@ -96,6 +95,7 @@ def run(  # noqa: C901, PLR0912
             targets=targets,
             params=sweep_overrides,
             copy_paths=copy_paths,
+            message=message,
             **kwargs,
         )
         if sweep_overrides:

dvc/repo/experiments/save.py

@@ -16,6 +16,7 @@ def save(
     name: Optional[str] = None,
     force: bool = False,
     include_untracked: Optional[List[str]] = None,
+    message: Optional[str] = None,
 ) -> Optional[str]:
     """Save the current workspace status as an experiment.
 
@@ -29,7 +30,10 @@ def save(
 
     try:
         save_result = executor.save(
-            executor.info, force=force, include_untracked=include_untracked
+            executor.info,
+            force=force,
+            include_untracked=include_untracked,
+            message=message,
         )
         result = queue.collect_executor(repo.experiments, executor, save_result)
     finally:

dvc/repo/experiments/serialize.py

@@ -1,7 +1,7 @@
 import json
 from dataclasses import asdict, dataclass, field
 from datetime import datetime
-from typing import TYPE_CHECKING, Any, Callable, Dict, Optional
+from typing import TYPE_CHECKING, Any, Callable, Dict, Iterator, List, Literal, Optional
 
 from dvc.exceptions import DvcException
 from dvc.repo.metrics.show import _gather_metrics
@@ -25,17 +25,15 @@ class _ISOEncoder(json.JSONEncoder):
 
 @dataclass(frozen=True)
 class SerializableExp:
-    """Serializable experiment state."""
+    """Serializable experiment data."""
 
     rev: str
     timestamp: Optional[datetime] = None
     params: Dict[str, Any] = field(default_factory=dict)
     metrics: Dict[str, Any] = field(default_factory=dict)
-    deps: Dict[str, "_ExpDep"] = field(default_factory=dict)
-    outs: Dict[str, "_ExpOut"] = field(default_factory=dict)
-    status: Optional[str] = None
-    executor: Optional[str] = None
-    error: Optional["SerializableError"] = None
+    deps: Dict[str, "ExpDep"] = field(default_factory=dict)
+    outs: Dict[str, "ExpOut"] = field(default_factory=dict)
+    meta: Dict[str, Any] = field(default_factory=dict)
 
     @classmethod
     def from_repo(
@@ -43,6 +41,7 @@ class SerializableExp:
         repo: "Repo",
         rev: Optional[str] = None,
         onerror: Optional[Callable] = None,
+        param_deps: bool = False,
         **kwargs,
     ) -> "SerializableExp":
         """Returns a SerializableExp from the current repo state.
@@ -57,29 +56,26 @@ class SerializableExp:
 
         rev = rev or repo.get_rev()
         assert rev
-        status: Optional[str] = kwargs.get("status")
         # NOTE: _gather_params/_gather_metrics return defaultdict which is not
         # supported in dataclasses.asdict() on all python releases
         # see https://bugs.python.org/issue35540
-        params = dict(_gather_params(repo, onerror=onerror))
-        if status and status.lower() in ("queued", "failed"):
-            metrics: Dict[str, Any] = {}
-        else:
-            metrics = dict(
-                _gather_metrics(
-                    repo,
-                    targets=None,
-                    rev=rev[:7],
-                    recursive=False,
-                    onerror=onerror_collect,
-                )
+        params = dict(_gather_params(repo, deps=param_deps, onerror=onerror))
+        params = {k: dict(v) for k, v in params.items()}
+        metrics = dict(
+            _gather_metrics(
+                repo,
+                targets=None,
+                rev=rev[:7],
+                recursive=False,
+                onerror=onerror_collect,
             )
+        )
         return cls(
             rev=rev,
             params=params,
             metrics=metrics,
             deps={
-                relpath(dep.fs_path, repo.root_dir): _ExpDep(
+                relpath(dep.fs_path, repo.root_dir): ExpDep(
                     hash=dep.hash_info.value if dep.hash_info else None,
                     size=dep.meta.size if dep.meta else None,
                     nfiles=dep.meta.nfiles if dep.meta else None,
@@ -88,7 +84,7 @@ class SerializableExp:
                 if not isinstance(dep, (ParamsDependency, RepoDependency))
             },
             outs={
-                relpath(out.fs_path, repo.root_dir): _ExpOut(
+                relpath(out.fs_path, repo.root_dir): ExpOut(
                     hash=out.hash_info.value if out.hash_info else None,
                     size=out.meta.size if out.meta else None,
                     nfiles=out.meta.nfiles if out.meta else None,
@@ -113,6 +109,10 @@ class SerializableExp:
             parsed = json.loads(data)
             if "timestamp" in parsed:
                 parsed["timestamp"] = datetime.fromisoformat(parsed["timestamp"])
+            if "deps" in parsed:
+                parsed["deps"] = {k: ExpDep(**v) for k, v in parsed["deps"].items()}
+            if "outs" in parsed:
+                parsed["outs"] = {k: ExpOut(**v) for k, v in parsed["outs"].items()}
             return cls(**parsed)
         except (TypeError, json.JSONDecodeError) as exc:
             raise DeserializeError("failed to load SerializableExp") from exc
@@ -120,8 +120,7 @@ class SerializableExp:
     @property
     def contains_error(self) -> bool:
         return (
-            self.error is not None
-            or self.params.get("error")
+            self.params.get("error")
             or any(value.get("error") for value in self.params.values())
             or self.metrics.get("error")
             or any(value.get("error") for value in self.metrics.values())
@@ -129,14 +128,14 @@ class SerializableExp:
 
 
 @dataclass(frozen=True)
-class _ExpDep:
+class ExpDep:
     hash: Optional[str]  # noqa: A003
     size: Optional[int]
     nfiles: Optional[int]
 
 
 @dataclass(frozen=True)
-class _ExpOut:
+class ExpOut:
     hash: Optional[str]  # noqa: A003
     size: Optional[int]
     nfiles: Optional[int]
@@ -162,3 +161,52 @@ class SerializableError:
             return cls(**parsed)
         except (TypeError, json.JSONDecodeError) as exc:
             raise DeserializeError("failed to load SerializableError") from exc
+
+
+@dataclass
+class ExpState:
+    """Git/DVC experiment state."""
+
+    rev: str
+    name: Optional[str] = None
+    data: Optional[SerializableExp] = None
+    error: Optional[SerializableError] = None
+    experiments: Optional[List["ExpRange"]] = None
+
+    def dumpd(self) -> Dict[str, Any]:
+        return asdict(self)
+
+
+@dataclass
+class ExpRange:
+    revs: List["ExpState"]
+    executor: Optional["ExpExecutor"] = None
+    name: Optional[str] = None
+
+    def __len__(self) -> int:
+        return len(self.revs)
+
+    def __iter__(self) -> Iterator["ExpState"]:
+        return iter(self.revs)
+
+    def __getitem__(self, index: int) -> "ExpState":
+        return self.revs[index]
+
+    def dumpd(self) -> Dict[str, Any]:
+        return asdict(self)
+
+
+@dataclass
+class LocalExpExecutor:
+    root: Optional[str] = None
+    log: Optional[str] = None
+    pid: Optional[int] = None
+    returncode: Optional[int] = None
+    task_id: Optional[str] = None
+
+
+@dataclass
+class ExpExecutor:
+    state: Literal["success", "queued", "running", "failed"]
+    name: Optional[str] = None
+    local: Optional[LocalExpExecutor] = None

dvc/repo/experiments/show.py

@@ -1,517 +1,390 @@
 import logging
-from collections import OrderedDict, defaultdict
-from datetime import datetime
-from enum import Enum
-from itertools import chain
+from collections import Counter, defaultdict
+from datetime import date, datetime
 from typing import (
     TYPE_CHECKING,
     Any,
-    Callable,
     Dict,
     Iterable,
+    Iterator,
     List,
+    Literal,
+    Mapping,
+    NamedTuple,
     Optional,
     Set,
     Tuple,
     Union,
 )
 
-from scmrepo.exceptions import SCMError as InnerScmError
+from dvc.exceptions import InvalidArgumentError
+from dvc.scm import Git
+from dvc.ui import ui
+from dvc.utils.flatten import flatten
 
-from dvc.exceptions import DvcException
-from dvc.scm import Git, SCMError, iter_revs, resolve_rev
-
-from .refs import ExpRefInfo
-from .serialize import SerializableError, SerializableExp
+from .collect import collect
 
 if TYPE_CHECKING:
-    from scmrepo.git.objects import GitCommit
-
+    from dvc.compare import TabularData
     from dvc.repo import Repo
+    from dvc.ui.table import CellT
+
+    from .serialize import ExpRange, ExpState
 
 logger = logging.getLogger(__name__)
 
 
-class ExpStatus(Enum):
-    Success = 0
-    Queued = 1
-    Running = 2
-    Failed = 3
-
-
-class _CachedError(DvcException):
-    def __init__(self, msg, typ, *args):
-        super().__init__(msg, *args)
-        self.typ = typ
-
-
-def _is_scm_error(collected_exp: Dict[str, Any]) -> bool:
-    if "error" in collected_exp and (
-        isinstance(collected_exp["error"], (_CachedError, SCMError, InnerScmError))
-    ):
-        return True
-    return False
-
-
-def _format_exp(exp: SerializableExp) -> Dict[str, Any]:
-    # SerializableExp always includes error but we need to strip it from show
-    # output when it is false-y to maintain compatibility w/tools that consume
-    # json output and assume that "error" key presence means there was an error
-    exp_dict = exp.dumpd()
-    if "error" in exp_dict and not exp_dict["error"]:
-        del exp_dict["error"]
-    return {"data": exp_dict}
-
-
-def _format_error(error: SerializableError):
-    msg = error.msg or "None"
-    return {"data": {}, "error": _CachedError(msg, error.type)}
-
-
-def collect_experiment_commit(
+def show(
     repo: "Repo",
-    exp_rev: str,
-    status: ExpStatus = ExpStatus.Success,
-    param_deps: bool = False,
-    force: bool = False,
+    revs: Union[List[str], str, None] = None,
+    all_branches: bool = False,
+    all_tags: bool = False,
+    all_commits: bool = False,
+    num: int = 1,
+    hide_queued: bool = False,
+    hide_failed: bool = False,
+    sha_only: bool = False,
     **kwargs,
-) -> Dict[str, Any]:
-    cache = repo.experiments.cache
-    # TODO: support filtering serialized exp when param_deps is set
-    if exp_rev != "workspace" and not (force or param_deps):
-        cached_exp = cache.get(exp_rev)
-        if cached_exp:
-            if status == ExpStatus.Running or (
-                isinstance(cached_exp, SerializableExp)
-                and cached_exp.status == ExpStatus.Running.name
-            ):
-                # expire cached queued exp entry once we start running it
-                cache.delete(exp_rev)
-            elif isinstance(cached_exp, SerializableError):
-                return _format_error(cached_exp)
-            else:
-                return _format_exp(cached_exp)
-    try:
-        exp = _collect_from_repo(
-            repo,
-            exp_rev,
-            status=status,
-            param_deps=param_deps,
-            force=force,
-            **kwargs,
-        )
-        if not (
-            exp_rev == "workspace"
-            or status == ExpStatus.Running
-            or param_deps
-            or exp.contains_error
-        ):
-            cache.put(exp, force=True)
-        return _format_exp(exp)
-    except Exception as exc:  # noqa: BLE001, pylint: disable=broad-except
-        logger.debug("", exc_info=True)
-        error = SerializableError(str(exc), type(exc).__name__)
-        return _format_error(error)
-
-
-def _collect_from_repo(
-    repo: "Repo",
-    exp_rev: str,
-    status: ExpStatus = ExpStatus.Success,
-    running: Optional[Dict[str, Any]] = None,
-    **kwargs,
-) -> "SerializableExp":
-    running = running or {}
-    with repo.switch(exp_rev) as rev:
-        if rev == "workspace":
-            timestamp: Optional[datetime] = None
-        else:
-            commit = repo.scm.resolve_commit(rev)
-            timestamp = datetime.fromtimestamp(commit.commit_time)
-
-        if status == ExpStatus.Running:
-            executor: Optional[str] = running.get(exp_rev, {}).get("location", None)
-        else:
-            executor = None
-
-        if status == ExpStatus.Failed:
-            error: Optional["SerializableError"] = SerializableError(
-                "Experiment run failed."
-            )
-        else:
-            error = None
-
-        return SerializableExp.from_repo(
-            repo,
-            rev=exp_rev,
-            timestamp=timestamp,
-            status=status.name,
-            executor=executor,
-            error=error,
-        )
-
-
-def _collect_complete_experiment(
-    repo: "Repo",
-    baseline: str,
-    exp_rev: str,
-    running: Dict[str, Any],
-    revs: List[str],
-    **kwargs,
-) -> Dict[str, Dict[str, Any]]:
-    results: "OrderedDict[str, Dict[str, Any]]" = OrderedDict()
-
-    checkpoint = len(revs) > 1
-    prev = ""
-
-    for rev in revs:
-        status = ExpStatus.Running if rev in running else ExpStatus.Success
-        collected_exp = collect_experiment_commit(
-            repo,
-            rev,
-            status=status,
-            running=running,
-            **kwargs,
-        )
-        if _is_scm_error(collected_exp):
-            return {}
-        if checkpoint:
-            exp = {"checkpoint_tip": exp_rev}
-            if prev:
-                results[prev]["data"][  # type: ignore[unreachable]
-                    "checkpoint_parent"
-                ] = rev
-            if rev in results:
-                results[rev]["data"].update(exp)
-                results.move_to_end(rev)
-            else:
-                exp.update(collected_exp["data"])
-        else:
-            exp = collected_exp["data"]
-        if rev not in results:
-            results[rev] = {"data": exp}
-        prev = rev
-    if checkpoint and prev:
-        results[prev]["data"]["checkpoint_parent"] = baseline
-    return results
-
-
-def _collect_branch(
-    repo: "Repo",
-    baseline: str,
-    running: Dict[str, Any],
-    refs: Optional[Iterable[str]] = None,
-    **kwargs,
-) -> Dict[str, Dict[str, Any]]:
-    results: Dict[str, Dict[str, Any]] = OrderedDict()
-    status = ExpStatus.Running if baseline in running else ExpStatus.Success
-    results["baseline"] = collect_experiment_commit(
+) -> List["ExpState"]:
+    return collect(
         repo,
-        baseline,
-        status=status,
-        running=running,
+        revs=revs,
+        all_branches=all_branches,
+        all_tags=all_tags,
+        all_commits=all_commits,
+        num=num,
+        hide_queued=hide_queued,
+        hide_failed=hide_failed,
+        sha_only=sha_only,
         **kwargs,
     )
-    if baseline == "workspace" or _is_scm_error(results["baseline"]):
-        return results
 
-    ref_info = ExpRefInfo(baseline_sha=baseline)
-    commits: List[Tuple[str, "GitCommit", str, List[str]]] = []
 
-    assert isinstance(repo.scm, Git)
-    if refs:
-        ref_it = (ref for ref in iter(refs) if ref.startswith(str(ref_info)))
-    else:
-        ref_it = repo.scm.iter_refs(base=str(ref_info))
-    for ref in ref_it:
-        try:
-            commit = repo.scm.resolve_commit(ref)
-            exp_rev = resolve_rev(repo.scm, ref)
-            revs = list(repo.scm.branch_revs(exp_rev, baseline))
-        except (SCMError, InnerScmError):
-            continue
-        commits.append((ref, commit, exp_rev, revs))
+def tabulate(
+    baseline_states: Iterable["ExpState"],
+    fill_value: Optional[str] = "-",
+    error_value: str = "!",
+    **kwargs,
+) -> Tuple["TabularData", Dict[str, Iterable[str]]]:
+    """Return table data for experiments.
 
-    for exp_ref, _, exp_rev, revs in sorted(
-        commits, key=lambda x: x[1].commit_time, reverse=True
-    ):
-        ref_info = ExpRefInfo.from_ref(exp_ref)
-        assert ref_info.baseline_sha == baseline
-        collected_exp = _collect_complete_experiment(
-            repo,
-            baseline=baseline,
-            exp_rev=exp_rev,
-            running=running,
-            revs=revs,
+    Returns:
+        Tuple of (table_data, data_headers)
+    """
+    from funcy import lconcat
+    from funcy.seqs import flatten as flatten_list
+
+    from dvc.compare import TabularData
+
+    data_names = _collect_names(baseline_states)
+    metrics_names = data_names.metrics
+    params_names = data_names.params
+    deps_names = data_names.sorted_deps
+
+    headers = [
+        "Experiment",
+        "rev",
+        "typ",
+        "Created",
+        "parent",
+        "State",
+        "Executor",
+    ]
+    names = {**metrics_names, **params_names}
+    counter = Counter(flatten_list([list(a.keys()) for a in names.values()]))
+    counter.update(headers)
+    metrics_headers = _normalize_headers(metrics_names, counter)
+    params_headers = _normalize_headers(params_names, counter)
+
+    all_headers = lconcat(headers, metrics_headers, params_headers, deps_names)
+    td = TabularData(all_headers, fill_value=fill_value)
+    td.extend(
+        _build_rows(
+            baseline_states,
+            all_headers=all_headers,
+            metrics_headers=metrics_headers,
+            params_headers=params_headers,
+            metrics_names=metrics_names,
+            params_names=params_names,
+            deps_names=deps_names,
+            fill_value=fill_value,
+            error_value=error_value,
             **kwargs,
         )
-        if _is_scm_error(collected_exp):
-            continue
-        results.update(collected_exp)
-    return results
+    )
+    data_headers: Dict[str, Iterable[str]] = {
+        "metrics": metrics_headers,
+        "params": params_headers,
+        "deps": deps_names,
+    }
+    return td, data_headers
 
 
-def get_branch_names(
-    scm: "Git", baseline_set: Iterable[str], refs: Optional[Iterable[str]] = None
-) -> Dict[str, Optional[str]]:
-    names: Dict[str, Optional[str]] = {}
-    bases = [
-        f"refs/exps/{baseline[:2]}/{baseline[2:]}/" for baseline in baseline_set
-    ] + ["refs/heads/", "refs/tags/"]
-    ref_it = iter(refs) if refs else scm.iter_refs()
-    for ref in ref_it:
-        for base in bases:
-            if ref.startswith(base):
-                try:
-                    rev = scm.get_ref(ref)
-                    names[rev] = ref[len(base) :]
-                except KeyError:
-                    logger.debug("unresolved ref %s", ref)
-                break
-    logger.debug("found refs for revs: %s", names)
-    return names
-
-
-def update_names(  # noqa: C901
-    repo: "Repo",
-    branch_names: Dict[str, Optional[str]],
-    result: Dict[str, Dict[str, Any]],
-):
-    rev_set = set()
-    for baseline in result:
-        for rev in result[baseline]:
-            if rev == "baseline":
-                rev = baseline
-            if rev != "workspace":
-                rev_set.add(rev)
-
-    if rev_set:
-        rev_set.difference_update(branch_names.keys())
-
-    exact_name = repo.experiments.get_exact_name(rev_set)
-
-    for baseline, baseline_results in result.items():
-        name_set: Set[str] = set()
-        for rev, rev_result in baseline_results.items():
-            name: Optional[str] = None
-            if rev == "baseline":
-                rev = baseline
-                if rev == "workspace":
-                    continue
-            name = branch_names.get(rev, None) or exact_name[rev]
-            if name and name not in name_set:
-                name_set.add(name)
-                rev_result["data"]["name"] = name
-
-
-def _collect_active_experiment(
-    repo: "Repo",
-    found_revs: Dict[str, List[str]],
-    running: Dict[str, Any],
+def _build_rows(
+    baseline_states: Iterable["ExpState"],
+    *,
+    all_headers: Iterable[str],
+    fill_value: Optional[str],
+    sort_by: Optional[str] = None,
+    sort_order: Optional[Literal["asc", "desc"]] = None,
     **kwargs,
-) -> Dict[str, Dict[str, Any]]:
-    result: Dict[str, Dict] = defaultdict(OrderedDict)
-    for entry in chain(
-        repo.experiments.tempdir_queue.iter_active(),
-        repo.experiments.celery_queue.iter_active(),
-    ):
-        stash_rev = entry.stash_rev
-        if entry.baseline_rev in found_revs and (
-            stash_rev not in running or not running[stash_rev].get("last")
+) -> Iterator[Tuple["CellT", ...]]:
+    for baseline in baseline_states:
+        row: Dict[str, "CellT"] = {k: fill_value for k in all_headers}
+        row["Experiment"] = ""
+        if baseline.name:
+            row["rev"] = baseline.name
+        elif Git.is_sha(baseline.rev):
+            row["rev"] = baseline.rev[:7]
+        else:
+            row["rev"] = baseline.rev
+        row["typ"] = "baseline"
+        row["parent"] = ""
+        if baseline.data:
+            row["Created"] = format_time(
+                baseline.data.timestamp, fill_value=fill_value, **kwargs
+            )
+            row.update(
+                _data_cells(  # pylint: disable=missing-kwoa
+                    baseline, fill_value=fill_value, **kwargs
+                )
+            )
+        yield tuple(row.values())
+        if baseline.experiments:
+            if sort_by:
+                metrics_names: Mapping[str, Iterable[str]] = kwargs.get(
+                    "metrics_names", {}
+                )
+                params_names: Mapping[str, Iterable[str]] = kwargs.get(
+                    "params_names", {}
+                )
+                sort_path, sort_name, sort_type = _sort_column(
+                    sort_by, metrics_names, params_names
+                )
+                reverse = sort_order == "desc"
+                experiments = _sort_exp(
+                    baseline.experiments, sort_path, sort_name, sort_type, reverse
+                )
+            else:
+                experiments = baseline.experiments
+            for i, child in enumerate(experiments):
+                yield from _exp_range_rows(
+                    child,
+                    all_headers=all_headers,
+                    fill_value=fill_value,
+                    is_base=i == len(baseline.experiments) - 1,
+                    **kwargs,
+                )
+
+
+def _sort_column(
+    sort_by: str,
+    metric_names: Mapping[str, Iterable[str]],
+    param_names: Mapping[str, Iterable[str]],
+) -> Tuple[str, str, str]:
+    path, _, sort_name = sort_by.rpartition(":")
+    matches: Set[Tuple[str, str, str]] = set()
+
+    if path:
+        if path in metric_names and sort_name in metric_names[path]:
+            matches.add((path, sort_name, "metrics"))
+        if path in param_names and sort_name in param_names[path]:
+            matches.add((path, sort_name, "params"))
+    else:
+        for path in metric_names:
+            if sort_name in metric_names[path]:
+                matches.add((path, sort_name, "metrics"))
+        for path in param_names:
+            if sort_name in param_names[path]:
+                matches.add((path, sort_name, "params"))
+
+    if len(matches) == 1:
+        return matches.pop()
+    if len(matches) > 1:
+        raise InvalidArgumentError(
+            "Ambiguous sort column '{}' matched '{}'".format(
+                sort_by,
+                ", ".join([f"{path}:{name}" for path, name, _ in matches]),
+            )
+        )
+    raise InvalidArgumentError(f"Unknown sort column '{sort_by}'")
+
+
+def _sort_exp(
+    experiments: Iterable["ExpRange"],
+    sort_path: str,
+    sort_name: str,
+    typ: str,
+    reverse: bool,
+) -> List["ExpRange"]:
+    from funcy import first
+
+    def _sort(exp_range: "ExpRange"):
+        exp = first(exp_range.revs)
+        if not exp:
+            return True
+        data = exp.data.dumpd().get(typ, {}).get(sort_path, {}).get("data", {})
+        val = flatten(data).get(sort_name)
+        return val is None, val
+
+    return sorted(experiments, key=_sort, reverse=reverse)
+
+
+def _exp_range_rows(
+    exp_range: "ExpRange",
+    *,
+    all_headers: Iterable[str],
+    fill_value: Optional[str],
+    is_base: bool = False,
+    **kwargs,
+) -> Iterator[Tuple["CellT", ...]]:
+    for i, exp in enumerate(exp_range.revs):
+        row: Dict[str, "CellT"] = {k: fill_value for k in all_headers}
+        row["Experiment"] = exp.name or ""
+        row["rev"] = exp.rev[:7] if Git.is_sha(exp.rev) else exp.rev
+        if len(exp_range.revs) > 1:
+            if i == 0:
+                row["typ"] = "checkpoint_tip"
+            elif i == len(exp_range.revs) - 1:
+                row["typ"] = "checkpoint_base"
+            else:
+                row["typ"] = "checkpoint_commit"
+        else:
+            row["typ"] = "branch_base" if is_base else "branch_commit"
+        row["parent"] = ""
+        if exp_range.executor:
+            row["State"] = exp_range.executor.state.capitalize()
+            if exp_range.executor.name:
+                row["Executor"] = exp_range.executor.name.capitalize()
+        if exp.data:
+            row["Created"] = format_time(
+                exp.data.timestamp, fill_value=fill_value, **kwargs
+            )
+            row.update(
+                _data_cells(  # pylint: disable=missing-kwoa
+                    exp, fill_value=fill_value, **kwargs
+                )
+            )
+        yield tuple(row.values())
+
+
+def _data_cells(
+    exp: "ExpState",
+    *,
+    metrics_headers: Iterable[str],
+    params_headers: Iterable[str],
+    metrics_names: Mapping[str, Iterable[str]],
+    params_names: Mapping[str, Iterable[str]],
+    deps_names: Iterable[str],
+    fill_value: Optional[str] = "-",
+    error_value: str = "!",
+    precision: Optional[int] = None,
+    **kwargs,
+) -> Iterator[Tuple[str, "CellT"]]:
+    def _d_cells(
+        d: Mapping[str, Any],
+        names: Mapping[str, Iterable[str]],
+        headers: Iterable[str],
+    ) -> Iterator[Tuple[str, "CellT"]]:
+        from dvc.compare import _format_field, with_value
+
+        for fname, data in d.items():
+            item = data.get("data", {})
+            item = flatten(item) if isinstance(item, dict) else {fname: item}
+            for name in names[fname]:
+                value = with_value(
+                    item.get(name),
+                    error_value if data.get("error") else fill_value,
+                )
+                # wrap field data in ui.rich_text, otherwise rich may
+                # interpret unescaped braces from list/dict types as rich
+                # markup tags
+                value = ui.rich_text(str(_format_field(value, precision)))
+                if name in headers:
+                    yield name, value
+                else:
+                    yield f"{fname}:{name}", value
+
+    if not exp.data:
+        return
+    yield from _d_cells(exp.data.metrics, metrics_names, metrics_headers)
+    yield from _d_cells(exp.data.params, params_names, params_headers)
+    for name in deps_names:
+        dep = exp.data.deps.get(name)
+        if dep:
+            yield name, dep.hash or fill_value
+
+
+def format_time(
+    timestamp: Optional[datetime],
+    fill_value: Optional[str] = "-",
+    iso: bool = False,
+    **kwargs,
+) -> Optional[str]:
+    if not timestamp:
+        return fill_value
+    if iso:
+        return timestamp.isoformat()
+    if timestamp.date() == date.today():
+        fmt = "%I:%M %p"
+    else:
+        fmt = "%b %d, %Y"
+    return timestamp.strftime(fmt)
+
+
+class _DataNames(NamedTuple):
+    # NOTE: we use nested dict instead of set for metrics/params names to
+    # preserve key ordering
+    metrics: Dict[str, Dict[str, Any]]
+    params: Dict[str, Dict[str, Any]]
+    deps: Set[str]
+
+    @property
+    def sorted_deps(self):
+        return sorted(self.deps)
+
+    def update(self, other: "_DataNames"):
+        def _update_d(
+            d: Dict[str, Dict[str, Any]], other_d: Mapping[str, Mapping[str, Any]]
         ):
-            collected_exp = collect_experiment_commit(
-                repo,
-                stash_rev,
-                status=ExpStatus.Running,
-                running=running,
-                **kwargs,
-            )
-            if _is_scm_error(collected_exp):
-                continue
-            result[entry.baseline_rev][stash_rev] = collected_exp
+            for k, v in other_d.items():
+                if k in d:
+                    d[k].update(v)
+                else:
+                    d[k] = dict(v)
+
+        _update_d(self.metrics, other.metrics)
+        _update_d(self.params, other.params)
+        self.deps.update(other.deps)
+
+
+def _collect_names(exp_states: Iterable["ExpState"]) -> _DataNames:
+    result = _DataNames(defaultdict(dict), defaultdict(dict), set())
+
+    def _collect_d(result_d: Dict[str, Dict[str, Any]], data_d: Dict[str, Any]):
+        for path, item in data_d.items():
+            item = item.get("data", {})
+            if isinstance(item, dict):
+                item = flatten(item)
+                result_d[path].update((key, None) for key in item)
+
+    for exp in exp_states:
+        if exp.data:
+            _collect_d(result.metrics, exp.data.metrics)
+            _collect_d(result.params, exp.data.params)
+            result.deps.update(exp.data.deps)
+        if exp.experiments:
+            for child in exp.experiments:
+                result.update(_collect_names(child.revs))
+
     return result
 
 
-def _collect_queued_experiment(
-    repo: "Repo",
-    found_revs: Dict[str, List[str]],
-    running: Dict[str, Any],
-    **kwargs,
-) -> Dict[str, Dict[str, Any]]:
-    result: Dict[str, Dict] = defaultdict(OrderedDict)
-    for entry in repo.experiments.celery_queue.iter_queued():
-        stash_rev = entry.stash_rev
-        if entry.baseline_rev in found_revs:
-            collected_exp = collect_experiment_commit(
-                repo,
-                stash_rev,
-                status=ExpStatus.Queued,
-                running=running,
-                **kwargs,
-            )
-            if _is_scm_error(collected_exp):
-                continue
-            result[entry.baseline_rev][stash_rev] = collected_exp
-    return result
-
-
-def _collect_failed_experiment(
-    repo: "Repo",
-    found_revs: Dict[str, List[str]],
-    running: Dict[str, Any],
-    **kwargs,
-) -> Dict[str, Dict[str, Any]]:
-    result: Dict[str, Dict] = defaultdict(OrderedDict)
-    for queue_done_result in repo.experiments.celery_queue.iter_failed():
-        entry = queue_done_result.entry
-        stash_rev = entry.stash_rev
-        if entry.baseline_rev in found_revs:
-            collected_exp = collect_experiment_commit(
-                repo,
-                stash_rev,
-                status=ExpStatus.Failed,
-                running=running,
-                **kwargs,
-            )
-            if _is_scm_error(collected_exp):
-                continue
-            result[entry.baseline_rev][stash_rev] = collected_exp
-    return result
-
-
-def update_new(
-    to_dict: Dict[str, Dict[str, Any]], from_dict: Dict[str, Dict[str, Any]]
-):
-    for baseline, experiments in from_dict.items():
-        for rev, experiment in experiments.items():
-            to_dict[baseline][rev] = to_dict[baseline].get(rev, experiment)
-
-
-def move_properties_to_head(result: Dict[str, Dict[str, Dict[str, Any]]]):
-    for _, baseline_results in result.items():
-        checkpoint: bool = False
-        head: Dict[str, Any] = {}
-        for rev, rev_data in baseline_results.items():
-            if (
-                "data" not in rev_data
-                or rev_data["data"].get("checkpoint_tip", None) is None
-            ):
-                checkpoint = False
-                head = {}
-                continue
-
-            rev_result: Dict[str, Any] = rev_data["data"]
-            if (
-                checkpoint is True
-                and rev_result["checkpoint_tip"] == head["checkpoint_tip"]
-            ):
-                if "name" in rev_result and "name" not in head:
-                    head["name"] = rev_result["name"]
-                    del rev_result["name"]
-                if rev_result["executor"]:
-                    if not head["executor"]:
-                        head["executor"] = rev_result["executor"]
-                    rev_result["executor"] = None
-                if rev_result["status"] == ExpStatus.Running.name:
-                    head["status"] = ExpStatus.Running.name
-                    rev_result["status"] = ExpStatus.Success.name
-            elif rev_result["checkpoint_tip"] == rev:
-                head = rev_result
-                checkpoint = True
-
-
-def show(  # noqa: PLR0913
-    repo: "Repo",
-    all_branches=False,
-    all_tags=False,
-    revs: Union[List[str], str, None] = None,
-    all_commits=False,
-    hide_queued=False,
-    hide_failed=False,
-    sha_only=False,
-    num=1,
-    param_deps=False,
-    onerror: Optional[Callable] = None,
-    fetch_running: bool = True,
-    force: bool = False,
-):
-    if repo.scm.no_commits:
-        return {}
-
-    res: Dict[str, Dict] = defaultdict(OrderedDict)
-
-    if not any([revs, all_branches, all_tags, all_commits]):
-        revs = ["HEAD"]
-    if isinstance(revs, str):
-        revs = [revs]
-
-    assert isinstance(repo.scm, Git)
-
-    found_revs: Dict[str, List[str]] = {"workspace": []}
-    found_revs.update(
-        iter_revs(repo.scm, revs, num, all_branches, all_tags, all_commits)
-    )
-    cached_refs = list(repo.scm.iter_refs())
-    branch_names = get_branch_names(repo.scm, found_revs, refs=cached_refs)
-
-    running: Dict[str, Dict] = repo.experiments.get_running_exps(
-        fetch_refs=fetch_running
-    )
-
-    queued_experiment = (
-        _collect_queued_experiment(
-            repo,
-            found_revs,
-            running,
-            param_deps=param_deps,
-            force=force,
-        )
-        if not hide_queued
-        else {}
-    )
-
-    active_experiment = _collect_active_experiment(
-        repo,
-        found_revs,
-        running,
-        param_deps=param_deps,
-        onerror=onerror,
-        force=force,
-    )
-
-    failed_experiments = (
-        _collect_failed_experiment(
-            repo,
-            found_revs,
-            running,
-            param_deps=param_deps,
-            onerror=onerror,
-            force=force,
-        )
-        if not hide_failed
-        else {}
-    )
-
-    for baseline in found_revs:
-        res[baseline] = _collect_branch(
-            repo,
-            baseline,
-            running=running,
-            param_deps=param_deps,
-            onerror=onerror,
-            force=force,
-            refs=cached_refs,
-        )
-
-    update_new(res, failed_experiments)
-
-    update_new(res, active_experiment)
-
-    update_new(res, queued_experiment)
-
-    if not sha_only:
-        update_names(repo, branch_names, res)
-
-    move_properties_to_head(res)
-
-    return res
+def _normalize_headers(
+    names: Mapping[str, Mapping[str, Any]], count: Mapping[str, int]
+) -> List[str]:
+    return [
+        name if count[name] == 1 else f"{path}:{name}"
+        for path in names
+        for name in names[path]
+    ]

dvc/repo/experiments/stash.py

@@ -21,7 +21,7 @@ class ExpStashEntry(NamedTuple):
         is not pushed onto the stash ref.
     head_rev: HEAD Git commit to be checked out for this experiment.
     baseline_rev: Experiment baseline commit.
-    branch: Optional exp (checkpoint) branch name for this experiment.
+    branch: Optional branch name for this experiment.
     name: Optional exp name.
     """