deps: remove 3.11 checks for hydra; has 3.11 support now

Bumps [pytest-xdist](https://github.com/pytest-dev/pytest-xdist) from 3.0.2 to 3.1.0.
- [Release notes](https://github.com/pytest-dev/pytest-xdist/releases)
- [Changelog](https://github.com/pytest-dev/pytest-xdist/blob/master/CHANGELOG.rst)
- [Commits](https://github.com/pytest-dev/pytest-xdist/compare/v3.0.2...v3.1.0)

---
updated-dependencies:
- dependency-name: pytest-xdist
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>

.codecov.yml

@@ -1,10 +0,0 @@
-comment: false
-coverage:
-  status:
-    project:
-      default:
-        target: 90
-        threshold: 10%
-    patch:
-      default:
-        threshold: 25%

.coveragerc

@@ -1,16 +0,0 @@
-[run]
-branch = True
-source = dvc
-omit =
-    *__main__.py
-
-[report]
-exclude_lines =
-    if __name__ == .__main__.:
-    if typing.TYPE_CHECKING:
-    if TYPE_CHECKING:
-    pass
-    raise NotImplementedError
-    # pragma: no cover
-    #  pragma: no cover
-    \.\.\.$

.dvcignore

@@ -1,4 +1,3 @@
 /tests
 /dvc
 /.github
-/bin

.flake8

@@ -0,0 +1,12 @@
+[flake8]
+ignore=
+    E203, # Whitespace before ':'
+    E266, # Too many leading '#' for block comment
+    W503, # Line break occurred before a binary operator
+    P1,  # unindexed parameters in the str.format, see:
+    # https://pypi.org/project/flake8-string-format/
+max_line_length = 79
+max-complexity = 15
+select = B,C,E,F,W,T4,B902,T,P
+show_source = true
+count = true

.github/ISSUE_TEMPLATE/bug_report.md

@@ -8,7 +8,7 @@ about: Create a bug report to help us improve DVC
 <!--
 ## Issue name
 
-Issue names must follow the pattern `command: description` where the command is the dvc command that you are trying to run. The description should describe the consequence of the bug. 
+Issue names must follow the pattern `command: description` where the command is the dvc command that you are trying to run. The description should describe the consequence of the bug.
 
 Example: `repro: doesn't detect input changes`
 -->

.github/ISSUE_TEMPLATE/feature_request.md

@@ -2,4 +2,3 @@
 name: "\U0001F680 Feature Request"
 about: Suggest an idea for this project
 ---
-

.github/codecov.yml

@@ -0,0 +1,12 @@
+codecov:
+  notify:
+    wait_for_ci: true
+coverage:
+  status:
+    project:
+      default:
+        target: auto
+        threshold: 2%
+    patch: off
+github_checks:
+  annotations: false

.github/release-drafter.yml

@@ -1,49 +0,0 @@
-# Config for https://github.com/apps/release-drafter
-name-template: "$RESOLVED_VERSION 🦉 "
-tag-template: "$RESOLVED_VERSION"
-categories:
-  - title: "🚀 New Features and Enhancements "
-    labels:
-      - "feature"
-      - "enhancement"
-      - "ui"
-  - title: "💣 Breaking Changes "
-    labels:
-      - "breaking-change"
-  - title: "🏇 Optimizations "
-    labels:
-      - "optimize"
-      - "performance"
-  - title: "🐛 Bug Fixes "
-    labels:
-      - "bugfix"
-      - "bug"
-  - title: "🔨 Maintenance "
-    labels:
-      - "maintenance"
-      - "refactoring"
-      - "chore"
-      - "build"
-      - "ci"
-change-template: "- $TITLE (#$NUMBER) @$AUTHOR"
-version-resolver:
-  major:
-    labels:
-      - "major"
-  minor:
-    labels:
-      - "minor"
-  patch:
-    labels:
-      - "patch"
-  default: patch
-exclude-labels:
-  - "skip-changelog"
-template: |
-  > Refer to https://dvc.org/doc/install for installation instructions.
-
-  ## Changes
-
-  $CHANGES
-
-  Thanks again to $CONTRIBUTORS for the contributions! 🎉

.github/release.yml

@@ -0,0 +1,16 @@
+changelog:
+  exclude:
+    labels: ["skip-changelog"]
+  categories:
+    - title: 🛠 Breaking Changes
+      labels: ["breaking-change"]
+    - title: 🚀 New Features and Enhancements
+      labels: ["feature", "enhancement", "ui"]
+    - title: ⚡ Optimizations
+      labels: ["optimize", "performance"]
+    - title: 🐛 Bug Fixes
+      labels: ["bugfix", "bug"]
+    - title: 🔨 Maintenance
+      labels: ["maintenance", "refactoring", "chore", "build", "ci"]
+    - title: Other Changes
+      labels: ["*"]

.github/workflows/benchmarks.yaml

@@ -12,7 +12,7 @@ jobs:
     steps:
       - uses: actions/setup-python@v4
         with:
-            python-version: "3.10"
+            python-version: "3.11"
       - uses: iterative/dvc-bench@main
         with:
             pytest_options: "-k 'test_init or test_help'"

.github/workflows/codeql.yml

@@ -0,0 +1,39 @@
+name: "CodeQL"
+
+on:
+  push:
+    branches: ["main"]
+  pull_request:
+    branches: ["main"]
+  schedule:
+    - cron: '32 19 * * 2'
+  workflow_dispatch:
+
+permissions:
+  contents: read
+
+jobs:
+  analyze:
+    name: Analyze
+    runs-on: ubuntu-latest
+    permissions:
+      actions: read
+      contents: read
+      security-events: write
+
+    strategy:
+      fail-fast: false
+      matrix:
+        language: ['python']
+
+    steps:
+    - name: Checkout repository
+      uses: actions/checkout@v3
+
+    - name: Initialize CodeQL
+      uses: github/codeql-action/init@v2
+      with:
+        languages: ${{ matrix.language }}
+
+    - name: Perform CodeQL Analysis
+      uses: github/codeql-action/analyze@v2

.github/workflows/packages.yaml

@@ -7,8 +7,13 @@ on:
     types: [released, prereleased]
   workflow_dispatch:
 
+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:
@@ -24,13 +29,13 @@ jobs:
       with:
           fetch-depth: 0
 
-    - name: Set up Python 3.9
+    - name: Set up Python 3.10
       uses: actions/setup-python@v4
       with:
-        python-version: 3.9
+        python-version: "3.10"
         cache: pip
         cache-dependency-path: |
-          setup.cfg
+          pyproject.toml
           scripts/build-requirements.txt
 
     - name: Set up Ruby 2.6
@@ -45,7 +50,7 @@ jobs:
 
     - name: Install deps
       run: |
-        pip install -U wheel pip setuptools
+        pip install --upgrade pip wheel setuptools
         pip install .[all]
         pip install -r scripts/build-requirements.txt
 
@@ -77,21 +82,31 @@ jobs:
       uses: actions/setup-python@v4
       with:
         python-version: 3.8
-        cache: pip
-        cache-dependency-path: setup.cfg
 
     - name: Install
+      run: pip install --upgrade pip wheel
+
+    - name: Force version for Test PyPI uploads
+      if: ${{ !startsWith(github.ref, 'refs/tags') }}
       run: |
-        pip install -U wheel pip build setuptools
-        pip install ".[all,tests]"
+        pip install setuptools_scm
+        echo version=$(python -m setuptools_scm | awk -F+ '{print $1}' | tail -1) >> $GITHUB_ENV
 
     - name: Build packages
-      run: |
-        pip install -U pip
-        ./scripts/build_package.sh
+      run: ./scripts/build_package.sh
+      env:
+        SETUPTOOLS_SCM_PRETEND_VERSION: ${{ env.version }}
 
     - 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

@@ -17,6 +17,9 @@ concurrency:
   group: ${{ github.workflow }}-${{ github.head_ref || github.run_id }}
   cancel-in-progress: true
 
+permissions:  # added using https://github.com/step-security/secure-workflows
+  contents: read
+
 jobs:
   lint:
     timeout-minutes: 10
@@ -29,13 +32,12 @@ jobs:
       uses: actions/setup-python@v4
       with:
         python-version: 3.8
+        cache: pip
+        cache-dependency-path: pyproject.toml
     - name: Install requirements
       run: |
-        pip install --upgrade pip setuptools wheel
-        pip install collective.checkdocs==0.2
+        pip install --upgrade pip wheel
         pip install ".[dev]"
-    - name: Check README
-      run: python setup.py checkdocs
     - uses: pre-commit/[email protected]
   tests:
     timeout-minutes: 45
@@ -43,13 +45,16 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        os: [ubuntu-20.04, windows-latest, macos-latest]
-        pyv: ["3.8", "3.9", "3.10"]
-        pytest-filter: 
+        os: [ubuntu-20.04, windows-latest]
+        pyv: ["3.8", "3.9", "3.10", "3.11"]
+        pytest-filter:
         - "import or plot or live or experiment"
         - "not (import or plot or live or experiment)"
         include:
-        - {os: ubuntu-latest, pyv: "3.11-dev"}
+        - {os: macos-latest, pyv: "3.8"}
+        - {os: macos-latest, pyv: "3.9"}
+        - {os: macos-latest, pyv: "3.10"}
+        - {os: macos-latest, pyv: "3.11"}
 
     steps:
     - uses: actions/checkout@v3
@@ -60,27 +65,30 @@ jobs:
       with:
         python-version: ${{ matrix.pyv }}
         cache: pip
-        cache-dependency-path: setup.cfg
+        cache-dependency-path: pyproject.toml
     - name: install
-      if: steps.cache.pip-cache-dir.cache-hit != 'true'
       run: |
-        pip install --upgrade pip setuptools wheel
+        pip install --upgrade pip wheel
         pip install -e ".[dev]"
-      env:
-        AIOHTTP_NO_EXTENSIONS: ${{ matrix.pyv == '3.11-dev' && '1' }}
     - name: run tests
-      timeout-minutes: 40
-      run: pytest -nauto -ra --durations 100 --cov=dvc --cov-report=xml --cov-report=term -k "${{ matrix.pytest-filter }}"
+      timeout-minutes: 20
+      run: pytest -nauto --durations 100 --cov --cov-report=xml --cov-report=term -k "${{ matrix.pytest-filter }}"
     - name: upload coverage report
       uses: codecov/codecov-action@v3
       with:
         file: ./coverage.xml
         fail_ci_if_error: false
+  check:
+    if: always()
+    needs: [lint, tests]
+    runs-on: ubuntu-latest
+    steps:
+      - uses: re-actors/alls-green@release/v1
+        with:
+          jobs: ${{ toJSON(needs) }}
   notify:
     if: github.ref == 'refs/heads/main' && failure()
-    needs:
-      - lint
-      - tests
+    needs: [lint, tests]
     runs-on: ubuntu-latest
     steps:
     - name: Slack Notification

.pre-commit-config.yaml

@@ -1,39 +1,62 @@
+default_language_version:
+  python: python3
+
 ci:
   skip: [mypy, pylint, dvc-pre-commit]
 
 repos:
-  - hooks:
-      - id: black
-        language_version: python3
-    repo: https://github.com/ambv/black
-    rev: 22.6.0
   - repo: https://github.com/pre-commit/pre-commit-hooks
     rev: v4.3.0
     hooks:
+      - id: check-added-large-files
+      - id: check-case-conflict
+      - id: check-executables-have-shebangs
+      - id: check-json
+      - id: check-merge-conflict
+        exclude: "tests/func/utils/test_strict_yaml.py"
+        args: ['--assume-in-merge']
       - id: check-toml
       - id: check-yaml
-  - hooks:
-      - id: codespell
-        args: 
-          - --ignore-words-list
-          - ba,datas,fo,uptodate,cachable
-    repo: https://github.com/codespell-project/codespell
-    rev: v2.1.0
-  - hooks:
-      - id: isort
-        language_version: python3
-    repo: https://github.com/timothycrosley/isort
+      - id: debug-statements
+        exclude: "dvc/_debug.py"
+      - id: end-of-file-fixer
+      - id: mixed-line-ending
+      - id: sort-simple-yaml
+      - id: trailing-whitespace
+  - repo: https://github.com/lovesegfault/beautysh
+    rev: v6.2.1
+    hooks:
+      - id: beautysh
+        args: ["-i", "2"]
+  - repo: https://github.com/asottile/pyupgrade
+    rev: v3.2.0
+    hooks:
+      - id: pyupgrade
+        args:
+          - --py38-plus
+  - repo: https://github.com/psf/black
+    rev: 22.10.0
+    hooks:
+      - id: black
+  - repo: https://github.com/PyCQA/isort
     rev: 5.10.1
-  - hooks:
+    hooks:
+      - id: isort
+  - repo: https://github.com/codespell-project/codespell
+    rev: v2.2.2
+    hooks:
+      - id: codespell
+        additional_dependencies: ["tomli"]
+  - repo: https://github.com/PyCQA/flake8
+    rev: 5.0.4
+    hooks:
       - id: flake8
-        language_version: python3
         additional_dependencies:
+          - flake8-broken-line
           - flake8-bugbear
           - flake8-comprehensions
           - flake8-debugger
           - flake8-string-format
-    repo: https://gitlab.com/pycqa/flake8
-    rev: 3.9.2
   - repo: local
     hooks:
     - id: mypy
@@ -47,14 +70,6 @@ repos:
       entry: pylint
       language: system
       types: [python]
-  - hooks:
-      - args:
-          - -i
-          - "2"
-        id: beautysh
-        language_version: python3
-    repo: https://github.com/lovesegfault/beautysh
-    rev: v6.2.1
   - hooks:
       - args:
           - git-hook

CODE_OF_CONDUCT.md

@@ -74,4 +74,3 @@ available at https://www.contributor-covenant.org/version/1/4/code-of-conduct.ht
 
 For answers to common questions about this code of conduct, see
 https://www.contributor-covenant.org/faq
-

MANIFEST.in

@@ -1,3 +0,0 @@
-include LICENSE
-recursive-include requirements *.txt
-recursive-include dvc/repo/plots/templates *.json

README.rst

@@ -13,7 +13,7 @@
 
 |CI| |Python Version| |Coverage| |VS Code| |DOI|
 
-|PyPI| |Packages| |Brew| |Conda| |Choco| |Snap|
+|PyPI| |PyPI Downloads| |Packages| |Brew| |Conda| |Choco| |Snap|
 
 |
 
@@ -82,7 +82,7 @@ To share and back up the *data cache*, DVC supports multiple remote storage plat
 
 |Flowchart|
 
-`DVC pipelines <https://dvc.org/doc/start/data-management/pipelines>`_ (computational graphs) connect code and data together.
+`DVC pipelines <https://dvc.org/doc/start/data-management/data-pipelines>`_ (computational graphs) connect code and data together.
 They specify all steps required to produce a model: input dependencies including code, data, commands to run; and output information to be saved.
 
 Last but not least, `DVC Experiment Versioning <https://dvc.org/doc/start/experiments>`_ lets you prepare and run a large number of experiments.
@@ -276,6 +276,10 @@ Barrak, A., Eghan, E.E. and Adams, B. `On the Co-evolution of ML Pipelines and S
    :target: https://pypi.org/project/dvc
    :alt: PyPI
 
+.. |PyPI Downloads| image:: https://img.shields.io/pypi/dm/dvc.svg?color=blue&label=Downloads&logo=pypi&logoColor=gold
+   :target: https://pypi.org/project/dvc
+   :alt: PyPI Downloads
+
 .. |Packages| image:: https://img.shields.io/github/v/release/iterative/dvc?label=deb|pkg|rpm|exe&logo=GitHub
    :target: https://github.com/iterative/dvc/releases/latest
    :alt: deb|pkg|rpm|exe
@@ -292,6 +296,6 @@ Barrak, A., Eghan, E.E. and Adams, B. `On the Co-evolution of ML Pipelines and S
    :target: https://github.com/iterative/dvc/graphs/contributors
    :alt: Contributors
 
-.. |VS Code| image:: https://vsmarketplacebadge.apphb.com/version/Iterative.dvc.svg
+.. |VS Code| image:: https://img.shields.io/visual-studio-marketplace/v/Iterative.dvc?color=blue&label=VSCode&logo=visualstudiocode&logoColor=blue
    :target: https://marketplace.visualstudio.com/items?itemName=Iterative.dvc
    :alt: VS Code Extension

bin/dvc

@@ -1,3 +0,0 @@
-#!/bin/bash
-
-PYTHONPATH=$DVC_HOME python -m dvc $@

bin/dvc.bat

@@ -1,3 +0,0 @@
-@echo OFF
-set PYTHONPATH=%DVC_HOME%
-python -m dvc %*

dvc/__init__.py

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

dvc/_debug.py

@@ -1,16 +1,14 @@
 from contextlib import ExitStack, contextmanager
 from datetime import datetime
-from typing import TYPE_CHECKING, Callable, Union
+from typing import TYPE_CHECKING, Callable, Optional, Union
 
 if TYPE_CHECKING:
     from argparse import Namespace
+    from types import FrameType
 
 
 @contextmanager
-def viztracer_profile(
-    path: Union[Callable[[], str], str],
-    max_stack_depth: int = -1,
-):
+def viztracer_profile(path: Union[Callable[[], str], str], depth: int = -1):
     try:
         import viztracer  # pylint: disable=import-error
     except ImportError:
@@ -18,7 +16,7 @@ def viztracer_profile(
         yield
         return
 
-    tracer = viztracer.VizTracer(max_stack_depth=max_stack_depth)
+    tracer = viztracer.VizTracer(max_stack_depth=depth)
 
     tracer.start()
     yield
@@ -29,7 +27,9 @@ def viztracer_profile(
 
 @contextmanager
 def yappi_profile(
-    path: Union[Callable[[], str], str] = None, wall_clock: bool = True
+    path: Union[Callable[[], str], str] = None,
+    wall_clock: Optional[bool] = True,
+    separate_threads: Optional[bool] = False,
 ):
     try:
         import yappi  # pylint: disable=import-error
@@ -44,14 +44,26 @@ def yappi_profile(
     yield
     yappi.stop()
 
-    # pylint:disable=no-member
-    if path:
-        stats = yappi.get_func_stats()
-        fpath = path() if callable(path) else path
-        stats.save(fpath, "callgrind")
+    threads = yappi.get_thread_stats()
+    stats = {}
+    if separate_threads:
+        for thread in threads:
+            ctx_id = thread.id
+            stats[ctx_id] = yappi.get_func_stats(ctx_id=ctx_id)
     else:
-        yappi.get_func_stats().print_all()
-        yappi.get_thread_stats().print_all()
+        stats[None] = yappi.get_func_stats()
+
+    fpath = path() if callable(path) else path
+    for ctx_id, st in stats.items():
+        if fpath:
+            out = f"{fpath}-{ctx_id}" if ctx_id is not None else fpath
+            st.save(out, type="callgrind")
+        else:
+            if ctx_id is not None:
+                print(f"\nThread {ctx_id}")
+            st.print_all()  # pylint:disable=no-member
+            if ctx_id is None:
+                threads.print_all()  # pylint:disable=no-member
 
     yappi.clear_stats()
 
@@ -109,6 +121,38 @@ def debug():
         raise  # prevent from jumping ahead
 
 
+def _sigshow(_, frame: Optional["FrameType"]) -> None:
+    from shutil import get_terminal_size
+    from traceback import format_stack
+
+    from dvc.ui import ui
+
+    lines = "\u2015" * get_terminal_size().columns
+    ui.error_write(lines, "\n", *format_stack(frame), lines, sep="")
+
+
+@contextmanager
+def show_stack():
+    r"""Show stack trace on SIGQUIT (Ctrl-\) or SIGINFO (Ctrl-T on macOS)."""
+    import signal
+
+    signal.signal(signal.SIGQUIT, _sigshow)
+    try:
+        signal.signal(signal.SIGINFO, _sigshow)  # only available on macOS
+    except AttributeError:
+        pass
+    yield
+
+
+def _get_path_func(tool: str, ext: str):
+    fmt = f"{tool}.dvc-{{now:%Y%m%d}}_{{now:%H%M%S}}.{ext}"
+
+    def func(now: Optional["datetime"] = None) -> str:
+        return fmt.format(now=now or datetime.now())
+
+    return func
+
+
 @contextmanager
 def debugtools(args: "Namespace" = None, **kwargs):
     kw = vars(args) if args else {}
@@ -121,19 +165,21 @@ def debugtools(args: "Namespace" = None, **kwargs):
             stack.enter_context(profile(kw.get("cprofile_dump")))
         if kw.get("instrument") or kw.get("instrument_open"):
             stack.enter_context(instrument(kw.get("instrument_open", False)))
+        if kw.get("show_stack", False):
+            stack.enter_context(show_stack())
         if kw.get("yappi"):
-            output = "callgrind.dvc-{0:%Y%m%d}_{0:%H%M%S}.out"
+            path_func = _get_path_func("callgrind", "out")
             stack.enter_context(
-                yappi_profile(path=lambda: output.format(datetime.now()))
-            )
-        if kw.get("viztracer") or kw.get("viztracer_depth"):
-            output = "viztracer.dvc-{0:%Y%m%d}_{0:%H%M%S}.json"
-            stack.enter_context(
-                viztracer_profile(
-                    path=lambda: output.format(datetime.now()),
-                    max_stack_depth=kw.get("viztracer_depth") or -1,
+                yappi_profile(
+                    path=path_func,
+                    separate_threads=kw.get("yappi_separate_threads"),
                 )
             )
+        if kw.get("viztracer") or kw.get("viztracer_depth"):
+            path_func = _get_path_func("viztracer", "json")
+            depth = kw.get("viztracer_depth") or -1
+            prof = viztracer_profile(path=path_func, depth=depth)
+            stack.enter_context(prof)
         yield
 
 
@@ -146,6 +192,12 @@ def add_debugging_flags(parser):
     parser.add_argument(
         "--yappi", action="store_true", default=False, help=SUPPRESS
     )
+    parser.add_argument(
+        "--yappi-separate-threads",
+        action="store_true",
+        default=False,
+        help=SUPPRESS,
+    )
     parser.add_argument(
         "--viztracer", action="store_true", default=False, help=SUPPRESS
     )
@@ -160,3 +212,10 @@ def add_debugging_flags(parser):
     parser.add_argument(
         "--instrument-open", action="store_true", default=False, help=SUPPRESS
     )
+    parser.add_argument(
+        "--show-stack",
+        "--ss",
+        action="store_true",
+        default=False,
+        help=SUPPRESS,
+    )

dvc/cli/parser.py

@@ -2,8 +2,8 @@
 import argparse
 import logging
 import os
-import sys
 
+from dvc import __version__
 from dvc.commands import (
     add,
     cache,
@@ -29,6 +29,7 @@ from dvc.commands import (
     init,
     install,
     ls,
+    ls_url,
     machine,
     metrics,
     move,
@@ -75,6 +76,7 @@ COMMANDS = [
     install,
     root,
     ls,
+    ls_url,
     freeze,
     dag,
     daemon,
@@ -126,17 +128,6 @@ class DvcParser(argparse.ArgumentParser):
         return args
 
 
-class VersionAction(argparse.Action):  # pragma: no cover
-    # pylint: disable=too-few-public-methods
-    """Shows DVC version and exits."""
-
-    def __call__(self, parser, namespace, values, option_string=None):
-        from dvc import __version__
-
-        print(__version__)
-        sys.exit(0)
-
-
 def get_parent_parser():
     """Create instances of a parser containing common arguments shared among
     all the commands.
@@ -184,13 +175,11 @@ def get_main_parser():
         help="Show this help message and exit.",
     )
 
-    # NOTE: On some python versions action='version' prints to stderr
-    # instead of stdout https://bugs.python.org/issue18920
     parser.add_argument(
         "-V",
         "--version",
-        action=VersionAction,
-        nargs=0,
+        action="version",
+        version=__version__,
         help="Show program's version.",
     )
 

dvc/commands/checkout.py

@@ -110,7 +110,7 @@ def add_parser(subparsers, parent_parser):
         nargs="*",
         help=(
             "Limit command scope to these tracked files/directories, "
-            ".dvc files, or stage names."
+            ".dvc files and stage names."
         ),
     ).complete = completion.DVC_FILE
     checkout_parser.set_defaults(func=CmdCheckout)

dvc/commands/commit.py

@@ -70,7 +70,9 @@ def add_parser(subparsers, parent_parser):
     commit_parser.add_argument(
         "targets",
         nargs="*",
-        help="stages or .dvc files to commit. Optional. "
-        "(Finds all DVC files in the workspace by default.)",
+        help=(
+            "Limit command scope to these tracked files/directories, "
+            ".dvc files and stage names."
+        ),
     ).complete = completion.DVCFILES_AND_STAGE
     commit_parser.set_defaults(func=CmdCommit)

dvc/commands/dag.py

@@ -204,7 +204,7 @@ def add_parser(subparsers, parent_parser):
     dag_parser.add_argument(
         "target",
         nargs="?",
-        help="Stage or output to show pipeline for (optional). "
+        help="Stage name or output to show pipeline for. "
         "Finds all stages in the workspace by default.",
     )
     dag_parser.set_defaults(func=CmdDAG)

dvc/commands/data_sync.py

@@ -120,7 +120,7 @@ def shared_parent_parser():
         nargs="*",
         help=(
             "Limit command scope to these tracked files/directories, "
-            ".dvc files, or stage names."
+            ".dvc files and stage names."
         ),
     ).complete = completion.DVC_FILE
 
@@ -195,7 +195,7 @@ def add_parser(subparsers, _parent_parser):
         "--glob",
         action="store_true",
         default=False,
-        help="Pull cache for targets matching shell-style wildcards.",
+        help=argparse.SUPPRESS,
     )
     pull_parser.set_defaults(func=CmdDataPull)
 

dvc/commands/experiments/__init__.py

@@ -18,6 +18,7 @@ from dvc.commands.experiments import (
     queue_worker,
     remove,
     run,
+    save,
     show,
 )
 
@@ -34,6 +35,7 @@ SUB_COMMANDS = [
     queue_worker,
     remove,
     run,
+    save,
     show,
 ]
 

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.ui import ui
 
 logger = logging.getLogger(__name__)
 
@@ -16,18 +17,13 @@ class CmdExperimentsList(CmdBase):
             num=self.args.num,
             git_remote=self.args.git_remote,
         )
+
         for baseline in exps:
-            tag = self.repo.scm.describe(baseline)
-            if not tag:
-                branch = self.repo.scm.describe(baseline, base="refs/heads")
-                if branch:
-                    tag = branch.split("/")[-1]
-            name = tag if tag else baseline[:7]
             if not name_only:
-                print(f"{name}:")
+                ui.write(f"{baseline}:")
             for exp_name in exps[baseline]:
                 indent = "" if name_only else "\t"
-                print(f"{indent}{exp_name}")
+                ui.write(f"{indent}{exp_name}")
 
         return 0
 

dvc/commands/experiments/save.py

@@ -0,0 +1,79 @@
+import argparse
+import logging
+
+from dvc.cli.command import CmdBase
+from dvc.cli.utils import append_doc_link
+from dvc.exceptions import DvcException
+from dvc.ui import ui
+
+logger = logging.getLogger(__name__)
+
+
+class CmdExperimentsSave(CmdBase):
+    def run(self):
+
+        try:
+            ref = self.repo.experiments.save(
+                name=self.args.name,
+                force=self.args.force,
+                include_untracked=self.args.include_untracked,
+            )
+        except DvcException:
+            logger.exception("failed to save experiment")
+            return 1
+
+        if self.args.json:
+            ui.write_json({"ref": ref})
+        else:
+            name = self.repo.experiments.get_exact_name([ref])[ref]
+            ui.write(f"Experiment has been saved as: {name}")
+            ui.write(
+                "\nTo promote an experiment to a Git branch run:\n\n"
+                "\tdvc exp branch <exp> <branch>\n"
+            )
+
+        return 0
+
+
+def add_parser(experiments_subparsers, parent_parser):
+    EXPERIMENTS_SAVE_HELP = "Save current workspace as a dvc experiment."
+    save_parser = experiments_subparsers.add_parser(
+        "save",
+        parents=[parent_parser],
+        description=append_doc_link(EXPERIMENTS_SAVE_HELP, "exp/save"),
+        help=EXPERIMENTS_SAVE_HELP,
+        formatter_class=argparse.RawDescriptionHelpFormatter,
+    )
+    save_parser.add_argument(
+        "-f",
+        "--force",
+        action="store_true",
+        default=False,
+        help="Save even if hash value for dependencies/outputs changed.",
+    )
+    save_parser.add_argument(
+        "--json",
+        "--show-json",
+        action="store_true",
+        default=False,
+        help="Show output in JSON format.",
+    )
+    save_parser.add_argument(
+        "-n",
+        "--name",
+        default=None,
+        help=(
+            "Human-readable experiment name. If not specified, a name will "
+            "be auto-generated."
+        ),
+        metavar="<name>",
+    )
+    save_parser.add_argument(
+        "-I",
+        "--include-untracked",
+        action="append",
+        default=[],
+        help="List of untracked paths to include in the experiment.",
+        metavar="<path>",
+    )
+    save_parser.set_defaults(func=CmdExperimentsSave)

dvc/commands/experiments/show.py

@@ -95,11 +95,8 @@ def _collect_rows(
 
         exp = results.get("data", {})
 
-        if exp.get("running"):
-            state = "Running"
-        elif exp.get("queued"):
-            state = "Queued"
-        else:
+        state = exp.get("status")
+        if state == "Success":
             state = fill_value
 
         is_baseline = rev == "baseline"
@@ -476,6 +473,8 @@ class CmdExperimentsShow(CmdBase):
                 all_branches=self.args.all_branches,
                 all_tags=self.args.all_tags,
                 all_commits=self.args.all_commits,
+                hide_queued=self.args.hide_queued,
+                hide_failed=self.args.hide_failed,
                 revs=self.args.rev,
                 num=self.args.num,
                 sha_only=self.args.sha,
@@ -594,6 +593,18 @@ def add_parser(experiments_subparsers, parent_parser):
         default=False,
         help="Always show git commit SHAs instead of branch/tag names.",
     )
+    experiments_show_parser.add_argument(
+        "--hide-failed",
+        action="store_true",
+        default=False,
+        help="Hide failed experiments in the table.",
+    )
+    experiments_show_parser.add_argument(
+        "--hide-queued",
+        action="store_true",
+        default=False,
+        help="Hide queued experiments in the table.",
+    )
     experiments_show_parser.add_argument(
         "--json",
         "--show-json",

dvc/commands/git_hook.py

@@ -74,7 +74,7 @@ class CmdMergeDriver(CmdHookBase):
             our = Dvcfile(dvc, self.args.our, verify=False)
             their = Dvcfile(dvc, self.args.their, verify=False)
 
-            our.merge(ancestor, their)
+            our.merge(ancestor, their, allowed=["add", "remove", "change"])
 
             return 0
         finally:

dvc/commands/imp_url.py

@@ -25,6 +25,7 @@ class CmdImportUrl(CmdBase):
                 labels=self.args.labels,
                 meta=self.args.meta,
                 jobs=self.args.jobs,
+                version_aware=self.args.version_aware,
             )
         except DvcException:
             logger.exception(
@@ -108,5 +109,14 @@ def add_parser(subparsers, parent_parser):
         ),
         metavar="<number>",
     )
+    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_url.py

@@ -0,0 +1,43 @@
+import argparse
+import logging
+
+from dvc.cli.command import CmdBaseNoRepo
+from dvc.cli.utils import append_doc_link
+from dvc.ui import ui
+
+from .ls import _prettify
+
+logger = logging.getLogger(__name__)
+
+
+class CmdListUrl(CmdBaseNoRepo):
+    def run(self):
+        from dvc.repo import Repo
+
+        entries = Repo.ls_url(self.args.url, recursive=self.args.recursive)
+        if entries:
+            entries = _prettify(entries, with_color=True)
+            ui.write("\n".join(entries))
+        return 0
+
+
+def add_parser(subparsers, parent_parser):
+    LS_HELP = "List directory contents from URL."
+    lsurl_parser = subparsers.add_parser(
+        "list-url",
+        aliases=["ls-url"],
+        parents=[parent_parser],
+        description=append_doc_link(LS_HELP, "list-url"),
+        help=LS_HELP,
+        formatter_class=argparse.RawDescriptionHelpFormatter,
+    )
+    lsurl_parser.add_argument(
+        "url", help="See `dvc import-url -h` for full list of supported URLs."
+    )
+    lsurl_parser.add_argument(
+        "-R",
+        "--recursive",
+        action="store_true",
+        help="Recursively list files.",
+    )
+    lsurl_parser.set_defaults(func=CmdListUrl)

dvc/commands/plots.py

@@ -25,7 +25,7 @@ def _show_json(renderers, split=False):
 
 
 def _adjust_vega_renderers(renderers):
-    from dvc.render import VERSION_FIELD
+    from dvc.render import REVISION_FIELD, VERSION_FIELD
     from dvc_render import VegaRenderer
 
     for r in renderers:
@@ -42,6 +42,7 @@ def _adjust_vega_renderers(renderers):
                         dp["rev"] = "::".join(vi.values())
             else:
                 for dp in r.datapoints:
+                    dp[REVISION_FIELD] = dp[VERSION_FIELD]["revision"]
                     dp.pop(VERSION_FIELD, {})
 
 
@@ -66,18 +67,6 @@ def _data_versions_count(renderer):
     return len(set(x))
 
 
-def _filter_unhandled_renderers(renderers):
-    # filtering out renderers currently unhandled by vscode extension
-    from dvc_render import VegaRenderer
-
-    def _is_json_viable(r):
-        return not (
-            isinstance(r, VegaRenderer) and _data_versions_count(r) > 1
-        )
-
-    return list(filter(_is_json_viable, renderers))
-
-
 class CmdPlots(CmdBase):
     def _func(self, *args, **kwargs):
         raise NotImplementedError
@@ -156,12 +145,10 @@ class CmdPlots(CmdBase):
                 templates_dir=self.repo.plots.templates_dir,
             )
             if self.args.json:
-                renderers = _filter_unhandled_renderers(renderers)
                 _show_json(renderers, self.args.split)
                 return 0
 
             _adjust_vega_renderers(renderers)
-
             if self.args.show_vega:
                 renderer = first(filter(lambda r: r.TYPE == "vega", renderers))
                 if renderer:

dvc/commands/repro.py

@@ -55,7 +55,16 @@ def add_arguments(repro_parser):
     repro_parser.add_argument(
         "targets",
         nargs="*",
-        help="Stages to reproduce. 'dvc.yaml' by default.",
+        help=(
+            """\
+Stages to reproduce. 'dvc.yaml' by default.
+The targets can be path to a dvc.yaml file or `.dvc` file,
+or a stage name from dvc.yaml file from
+current working directory. To run a stage from dvc.yaml
+from other directories, the target must be a path followed by colon `:`
+and then the stage name name.
+"""
+        ),
     ).complete = completion.DVCFILES_AND_STAGE
     repro_parser.add_argument(
         "-f",

dvc/commands/stage.py

@@ -238,26 +238,6 @@ def _add_common_args(parser):
         help="Declare output plot file (do not put into DVC cache).",
         metavar="<path>",
     )
-    parser.add_argument(
-        "--live", help="Declare output as dvclive.", metavar="<path>"
-    )
-    parser.add_argument(
-        "--live-no-cache",
-        help="Declare output as dvclive (do not put into DVC cache).",
-        metavar="<path>",
-    )
-    parser.add_argument(
-        "--live-no-summary",
-        action="store_true",
-        default=False,
-        help=argparse.SUPPRESS,
-    )
-    parser.add_argument(
-        "--live-no-html",
-        action="store_true",
-        default=False,
-        help="Signal dvclive logger to not produce training report.",
-    )
     parser.add_argument(
         "-w",
         "--wdir",

dvc/commands/update.py

@@ -31,7 +31,8 @@ class CmdUpdate(CmdBase):
 def add_parser(subparsers, parent_parser):
     UPDATE_HELP = (
         "Update data artifact imported (via dvc import or dvc import-url) "
-        "from an external DVC repository or URL."
+        "from an external DVC repository or URL, or update data from a "
+        "DVC worktree remote."
     )
     update_parser = subparsers.add_parser(
         "update",
@@ -60,7 +61,7 @@ def add_parser(subparsers, parent_parser):
         "--no-download",
         action="store_true",
         default=False,
-        help="Update .dvc file hash value(s)"
+        help="Update .dvc file git revision/hash value(s)"
         " but do not download the file(s).",
     )
     update_parser.add_argument(

dvc/config.py

@@ -176,7 +176,10 @@ class Config(dict):
 
         if fs.exists(filename):
             with fs.open(filename) as fobj:
-                conf_obj = ConfigObj(fobj)
+                try:
+                    conf_obj = ConfigObj(fobj)
+                except UnicodeDecodeError as exc:
+                    raise ConfigError(str(exc)) from exc
         else:
             conf_obj = ConfigObj()
         return _parse_named(_lower_keys(conf_obj.dict()))

dvc/config_schema.py

@@ -180,6 +180,8 @@ SCHEMA = {
                     "user": str,
                     "password": str,
                     "ask_password": Bool,
+                    "passphrase": str,
+                    "ask_passphrase": Bool,
                     "keyfile": str,
                     "timeout": Coerce(int),
                     "gss_auth": Bool,

dvc/data_cloud.py

@@ -5,12 +5,14 @@ from typing import TYPE_CHECKING, Iterable, Optional
 
 from funcy import cached_property
 
+from dvc.config import NoRemoteError, RemoteConfigError
 from dvc_data.hashfile.db import get_index
 
 if TYPE_CHECKING:
     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__)
 
@@ -22,6 +24,14 @@ class Remote:
 
         self.worktree = config.pop("worktree", False)
         self.config = config
+        if self.worktree:
+            version_aware = self.config.get("version_aware")
+            if version_aware is False:
+                raise RemoteConfigError(
+                    "worktree remotes require version_aware cloud"
+                )
+            if version_aware is None:
+                self.fs.version_aware = True
 
     @cached_property
     def odb(self):
@@ -53,8 +63,6 @@ class DataCloud:
         name: Optional[str] = None,
         command: str = "<command>",
     ) -> "Remote":
-        from dvc.config import NoRemoteError
-
         if not name:
             name = self.repo.config["core"].get("remote")
 
@@ -87,6 +95,10 @@ class DataCloud:
         command: str = "<command>",
     ) -> "HashFileDB":
         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"
+            )
         return remote.odb
 
     def _log_missing(self, status: "CompareStatusResult"):
@@ -106,14 +118,10 @@ class DataCloud:
         dest_odb: "HashFileDB",
         objs: Iterable["HashInfo"],
         **kwargs,
-    ):
-        from dvc.exceptions import FileTransferError
-        from dvc_data.hashfile.transfer import TransferError, transfer
+    ) -> "TransferResult":
+        from dvc_data.hashfile.transfer import transfer
 
-        try:
-            return transfer(src_odb, dest_odb, objs, **kwargs)
-        except TransferError as exc:
-            raise FileTransferError(exc.fails) from exc
+        return transfer(src_odb, dest_odb, objs, **kwargs)
 
     def push(
         self,
@@ -121,7 +129,7 @@ class DataCloud:
         jobs: Optional[int] = None,
         remote: Optional[str] = None,
         odb: Optional["HashFileDB"] = None,
-    ):
+    ) -> "TransferResult":
         """Push data items in a cloud-agnostic way.
 
         Args:
@@ -148,7 +156,7 @@ class DataCloud:
         jobs: Optional[int] = None,
         remote: Optional[str] = None,
         odb: Optional["HashFileDB"] = None,
-    ):
+    ) -> "TransferResult":
         """Pull data items in a cloud-agnostic way.
 
         Args:

dvc/dependency/__init__.py

@@ -1,7 +1,7 @@
 from collections import defaultdict
 from typing import Any, Mapping
 
-from dvc.output import ARTIFACT_SCHEMA, Output
+from dvc.output import ARTIFACT_SCHEMA, DIR_FILES_SCHEMA, Output
 
 from .base import Dependency
 from .param import ParamsDependency
@@ -15,10 +15,11 @@ SCHEMA: Mapping[str, Any] = {
     **ARTIFACT_SCHEMA,
     **RepoDependency.REPO_SCHEMA,
     **ParamsDependency.PARAM_SCHEMA,
+    Output.PARAM_FILES: [DIR_FILES_SCHEMA],
 }
 
 
-def _get(stage, p, info, fs_config=None):
+def _get(stage, p, info, **kwargs):
     if info and info.get(RepoDependency.PARAM_REPO):
         repo = info.pop(RepoDependency.PARAM_REPO)
         return RepoDependency(repo, stage, p, info)
@@ -27,14 +28,15 @@ def _get(stage, p, info, fs_config=None):
         params = info.pop(ParamsDependency.PARAM_PARAMS)
         return ParamsDependency(stage, p, params)
 
-    return Dependency(stage, p, info, fs_config=fs_config)
+    return Dependency(stage, p, info, **kwargs)
 
 
 def loadd_from(stage, d_list):
     ret = []
     for d in d_list:
         p = d.pop(Output.PARAM_PATH, None)
-        ret.append(_get(stage, p, d))
+        files = d.pop(Output.PARAM_FILES, None)
+        ret.append(_get(stage, p, d, files=files))
     return ret
 
 

dvc/dependency/base.py

@@ -1,6 +1,7 @@
-from typing import Type
+from typing import Dict, Type
 
 from dvc.exceptions import DvcException
+from dvc.fs import download as fs_download
 from dvc.output import Output
 
 
@@ -30,5 +31,39 @@ class Dependency(Output):
     )  # type: Type[DvcException]
     IsStageFileError = DependencyIsStageFileError  # type: Type[DvcException]
 
+    def workspace_status(self) -> Dict[str, str]:
+        if self.fs.version_aware:
+            old_fs_path = self.fs_path
+            try:
+                self.fs_path = self.fs.path.version_path(self.fs_path, None)
+                if self.changed_meta():
+                    return {str(self): "update available"}
+            finally:
+                self.fs_path = old_fs_path
+        return super().workspace_status()
+
     def update(self, rev=None):
-        pass
+        if self.fs.version_aware:
+            self.fs_path = self.fs.path.version_path(self.fs_path, rev)
+            self.meta = self.get_meta()
+            self.def_path = self.fs.path.version_path(
+                self.def_path, self.meta.version_id
+            )
+            self.fs_path = self.fs.path.version_path(
+                self.fs_path, self.meta.version_id
+            )
+
+    def download(self, to, jobs=None):
+        fs_download(self.fs, self.fs_path, to, jobs=jobs)
+
+    def save(self):
+        super().save()
+        if self.fs.version_aware:
+            self.fs_path = self.fs.path.version_path(
+                self.fs_path, self.meta.version_id
+            )
+
+    def dumpd(self, **kwargs):
+        if self.fs.version_aware:
+            kwargs["with_files"] = True
+        return super().dumpd(**kwargs)

dvc/dependency/repo.py

@@ -6,6 +6,7 @@ from typing import TYPE_CHECKING, Dict, Optional, Set, Tuple
 from voluptuous import Required
 
 from dvc.prompt import confirm
+from dvc_data.hashfile.meta import Meta
 
 from .base import Dependency
 
@@ -32,6 +33,7 @@ class RepoDependency(Dependency):
     def __init__(self, def_repo, stage, *args, **kwargs):
         self.def_repo = def_repo
         self._objs: Dict[str, "HashFile"] = {}
+        self._meta: Dict[str, Meta] = {}
         super().__init__(stage, *args, **kwargs)
 
     def _parse_path(self, fs, fs_path):
@@ -94,12 +96,12 @@ class RepoDependency(Dependency):
     def get_used_objs(
         self, **kwargs
     ) -> Dict[Optional["ObjectDB"], Set["HashInfo"]]:
-        used, _ = self._get_used_and_obj(**kwargs)
+        used, _, _ = self._get_used_and_obj(**kwargs)
         return used
 
     def _get_used_and_obj(
         self, obj_only=False, **kwargs
-    ) -> Tuple[Dict[Optional["ObjectDB"], Set["HashInfo"]], "HashFile"]:
+    ) -> Tuple[Dict[Optional["ObjectDB"], Set["HashInfo"]], Meta, "HashFile"]:
         from dvc.config import NoRemoteError
         from dvc.exceptions import NoOutputOrStageError, PathMissingError
         from dvc.utils import as_posix
@@ -131,7 +133,7 @@ class RepoDependency(Dependency):
                     pass
 
             try:
-                object_store, _, obj = build(
+                object_store, meta, obj = build(
                     local_odb,
                     as_posix(self.def_path),
                     repo.dvcfs,
@@ -145,10 +147,12 @@ class RepoDependency(Dependency):
             object_store.read_only = True
 
             self._objs[rev] = obj
+            self._meta[rev] = meta
+
             used_obj_ids[object_store].add(obj.hash_info)
             if isinstance(obj, Tree):
                 used_obj_ids[object_store].update(oid for _, _, oid in obj)
-            return used_obj_ids, obj
+            return used_obj_ids, meta, obj
 
     def _check_circular_import(self, odb, obj_ids):
         from dvc.exceptions import CircularImportError
@@ -190,11 +194,21 @@ class RepoDependency(Dependency):
         rev = self._get_rev(locked=locked)
         if rev in self._objs:
             return self._objs[rev]
-        _, obj = self._get_used_and_obj(
+        _, _, obj = self._get_used_and_obj(
             obj_only=True, filter_info=filter_info, **kwargs
         )
         return obj
 
+    def get_meta(self, filter_info=None, **kwargs):
+        locked = kwargs.get("locked", True)
+        rev = self._get_rev(locked=locked)
+        if rev in self._meta:
+            return self._meta[rev]
+        _, meta, _ = self._get_used_and_obj(
+            obj_only=True, filter_info=filter_info, **kwargs
+        )
+        return meta
+
     def _make_repo(self, locked=True, **kwargs):
         from dvc.external_repo import external_repo
 

dvc/dvcfile.py

@@ -172,7 +172,7 @@ class FileMixin:
     def dump(self, stage, **kwargs):
         raise NotImplementedError
 
-    def merge(self, ancestor, other):
+    def merge(self, ancestor, other, allowed=None):
         raise NotImplementedError
 
 
@@ -204,12 +204,12 @@ class SingleStageFile(FileMixin):
     def remove_stage(self, stage):  # pylint: disable=unused-argument
         self.remove()
 
-    def merge(self, ancestor, other):
+    def merge(self, ancestor, other, allowed=None):
         assert isinstance(ancestor, SingleStageFile)
         assert isinstance(other, SingleStageFile)
 
         stage = self.stage
-        stage.merge(ancestor.stage, other.stage)
+        stage.merge(ancestor.stage, other.stage, allowed=allowed)
         self.dump(stage)
 
 
@@ -237,10 +237,10 @@ class PipelineFile(FileMixin):
             self._dump_pipeline_file(stage)
 
         if update_lock:
-            self._dump_lockfile(stage)
+            self._dump_lockfile(stage, **kwargs)
 
-    def _dump_lockfile(self, stage):
-        self._lockfile.dump(stage)
+    def _dump_lockfile(self, stage, **kwargs):
+        self._lockfile.dump(stage, **kwargs)
 
     @staticmethod
     def _check_if_parametrized(stage, action: str = "dump") -> None:
@@ -310,7 +310,7 @@ class PipelineFile(FileMixin):
         else:
             super().remove()
 
-    def merge(self, ancestor, other):
+    def merge(self, ancestor, other, allowed=None):
         raise NotImplementedError
 
 
@@ -366,7 +366,7 @@ class Lockfile(FileMixin):
         return {SCHEMA_KWD: version}
 
     def dump(self, stage, **kwargs):
-        stage_data = serialize.to_lockfile(stage)
+        stage_data = serialize.to_lockfile(stage, **kwargs)
 
         with modify_yaml(self.path, fs=self.repo.fs) as data:
             version = LOCKFILE_VERSION.from_dict(data)
@@ -411,7 +411,7 @@ class Lockfile(FileMixin):
         else:
             self.remove()
 
-    def merge(self, ancestor, other):
+    def merge(self, ancestor, other, allowed=None):
         raise NotImplementedError
 
 

dvc/env.py

@@ -2,11 +2,10 @@ DVC_CHECKPOINT = "DVC_CHECKPOINT"
 DVC_DAEMON = "DVC_DAEMON"
 DVC_PAGER = "DVC_PAGER"
 DVC_ROOT = "DVC_ROOT"
-DVCLIVE_PATH = "DVCLIVE_PATH"
-DVCLIVE_SUMMARY = "DVCLIVE_SUMMARY"
-DVCLIVE_HTML = "DVCLIVE_HTML"
 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/exceptions.py

@@ -132,10 +132,17 @@ class NotDvcRepoError(DvcException):
 class CyclicGraphError(DvcException):
     def __init__(self, stages):
         assert isinstance(stages, list)
-        msg = "Pipeline has a cycle involving: {}.".format(
-            ", ".join(s.addressing for s in stages)
+        stage_part = "stage" if len(stages) == 1 else "stages"
+        msg = (
+            "Same item(s) are defined as both a dependency and an output "
+            "in {stage_part}: {stage}."
+        )
+        super().__init__(
+            msg.format(
+                stage_part=stage_part,
+                stage=", ".join(s.addressing for s in stages),
+            )
         )
-        super().__init__(msg)
 
 
 class ConfirmRemoveError(DvcException):
@@ -278,6 +285,11 @@ class PathMissingError(DvcException):
         self.dvc_only = dvc_only
 
 
+class URLMissingError(DvcException):
+    def __init__(self, url):
+        super().__init__(f"The path '{url}' does not exist")
+
+
 class RemoteCacheRequiredError(DvcException):
     def __init__(self, scheme, fs_path):
 

dvc/fs/__init__.py

@@ -2,6 +2,9 @@ from urllib.parse import urlparse
 
 from dvc_http import HTTPFileSystem, HTTPSFileSystem  # noqa: F401
 
+from dvc.config import ConfigError as RepoConfigError
+from dvc.config_schema import SCHEMA, Invalid
+
 # pylint: disable=unused-import
 from dvc_objects.fs import utils  # noqa: F401
 from dvc_objects.fs import (  # noqa: F401
@@ -23,6 +26,7 @@ from dvc_objects.fs.errors import (  # noqa: F401
 )
 from dvc_objects.fs.path import Path  # noqa: F401
 
+from .callbacks import Callback
 from .data import DataFileSystem  # noqa: F401
 from .dvc import DVCFileSystem  # noqa: F401
 from .git import GitFileSystem  # noqa: F401
@@ -44,7 +48,23 @@ known_implementations.update(
 # pylint: enable=unused-import
 
 
-def get_fs_config(repo, config, **kwargs):
+def download(fs, fs_path, to, jobs=None):
+    with Callback.as_tqdm_callback(
+        desc=f"Downloading {fs.path.name(fs_path)}",
+        unit="files",
+    ) as cb:
+        fs.get(fs_path, to.fs_path, batch_size=jobs, callback=cb)
+
+
+def parse_external_url(url, config=None):
+    remote_config = dict(config) if config else {}
+    remote_config["url"] = url
+    fs_cls, fs_config, fs_path = get_cloud_fs(None, **remote_config)
+    fs = fs_cls(**fs_config)
+    return fs, fs_path
+
+
+def get_fs_config(config, **kwargs):
     name = kwargs.get("name")
     if name:
         try:
@@ -55,10 +75,10 @@ def get_fs_config(repo, config, **kwargs):
             raise RemoteNotFoundError(f"remote '{name}' doesn't exist")
     else:
         remote_conf = kwargs
-    return _resolve_remote_refs(repo, config, remote_conf)
+    return _resolve_remote_refs(config, remote_conf)
 
 
-def _resolve_remote_refs(repo, config, remote_conf):
+def _resolve_remote_refs(config, remote_conf):
     # Support for cross referenced remotes.
     # This will merge the settings, shadowing base ref with remote_conf.
     # For example, having:
@@ -84,21 +104,22 @@ def _resolve_remote_refs(repo, config, remote_conf):
     if parsed.scheme != "remote":
         return remote_conf
 
-    base = get_fs_config(repo, config, name=parsed.netloc)
-    cls, _, _ = get_cloud_fs(repo, **base)
+    base = get_fs_config(config, name=parsed.netloc)
+    cls, _, _ = _get_cloud_fs(config, **base)
     relpath = parsed.path.lstrip("/").replace("/", cls.sep)
     url = cls.sep.join((base["url"], relpath))
     return {**base, **remote_conf, "url": url}
 
 
 def get_cloud_fs(repo, **kwargs):
-    from dvc.config import ConfigError as RepoConfigError
-    from dvc.config_schema import SCHEMA, Invalid
-
     repo_config = repo.config if repo else {}
+    return _get_cloud_fs(repo_config, **kwargs)
+
+
+def _get_cloud_fs(repo_config, **kwargs):
     core_config = repo_config.get("core", {})
 
-    remote_conf = get_fs_config(repo, repo_config, **kwargs)
+    remote_conf = get_fs_config(repo_config, **kwargs)
     try:
         remote_conf = SCHEMA["remote"][str](remote_conf)
     except Invalid as exc:

dvc/fs/callbacks.py

@@ -1,6 +1,6 @@
 # pylint: disable=unused-import
 from contextlib import ExitStack
-from typing import TYPE_CHECKING, Optional
+from typing import TYPE_CHECKING, Any, BinaryIO, Dict, Optional, Union
 
 from funcy import cached_property
 
@@ -24,6 +24,7 @@ class RichCallback(Callback):
         bytes: bool = False,  # pylint: disable=redefined-builtin
         unit: str = None,
         disable: bool = False,
+        transient: bool = True,
     ) -> None:
         self._progress = progress
         self.disable = disable
@@ -35,6 +36,7 @@ class RichCallback(Callback):
             "visible": False,
             "progress_type": None if bytes else "summary",
         }
+        self._transient = transient
         self._stack = ExitStack()
         super().__init__(size=size, value=value)
 
@@ -47,7 +49,7 @@ class RichCallback(Callback):
             return self._progress
 
         progress = RichTransferProgress(
-            transient=True,
+            transient=self._transient,
             disable=self.disable,
             console=ui.error_console,
         )
@@ -61,7 +63,8 @@ class RichCallback(Callback):
         return self
 
     def close(self):
-        self.progress.clear_task(self.task)
+        if self._transient:
+            self.progress.clear_task(self.task)
         self._stack.close()
 
     def call(self, hook_name=None, **kwargs):
@@ -72,8 +75,17 @@ class RichCallback(Callback):
             visible=not self.disable,
         )
 
-    def branch(self, path_1, path_2, kwargs, child: Optional[Callback] = None):
+    def branch(
+        self,
+        path_1: Union[str, BinaryIO],
+        path_2: str,
+        kwargs: Dict[str, Any],
+        child: "Callback" = None,
+    ):
         child = child or RichCallback(
-            progress=self.progress, desc=path_1, bytes=True
+            progress=self.progress,
+            desc=path_1 if isinstance(path_1, str) else path_2,
+            bytes=True,
+            transient=self._transient,
         )
         return super().branch(path_1, path_2, kwargs, child=child)

dvc/fs/dvc.py

@@ -10,9 +10,7 @@ from typing import TYPE_CHECKING, Any, Callable, Optional, Tuple, Type, Union
 from fsspec.spec import AbstractFileSystem
 from funcy import cached_property, wrap_prop, wrap_with
 
-from dvc.utils.fs import makedirs
 from dvc_objects.fs.base import FileSystem
-from dvc_objects.fs.callbacks import DEFAULT_CALLBACK
 from dvc_objects.fs.path import Path
 
 from .data import DataFileSystem
@@ -66,15 +64,7 @@ def _get_dvc_path(dvc_fs, subkey):
 
 
 class _DVCFileSystem(AbstractFileSystem):  # pylint:disable=abstract-method
-    """DVC + git-tracked files fs.
-
-    Args:
-        repo: DVC or git repo.
-        subrepos: traverse to subrepos (by default, it ignores subrepos)
-        repo_factory: A function to initialize subrepo with, default is Repo.
-        kwargs: Additional keyword arguments passed to the `DataFileSystem()`.
-    """
-
+    cachable = False
     root_marker = "/"
 
     def __init__(
@@ -86,6 +76,41 @@ class _DVCFileSystem(AbstractFileSystem):  # pylint:disable=abstract-method
         repo_factory: Optional[RepoFactory] = None,
         **repo_kwargs: Any,
     ) -> None:
+        """DVC + git-tracked files fs.
+
+        Args:
+            path (str, optional): URL or path to a DVC/Git repository.
+                Defaults to a DVC repository in the current working directory.
+                Both HTTP and SSH protocols are supported for remote Git repos
+                (e.g. [user@]server:project.git).
+            rev (str, optional): Any Git revision such as a branch or tag name,
+                a commit hash or a dvc experiment name.
+                Defaults to the default branch in case of remote repositories.
+                In case of a local repository, if rev is unspecified, it will
+                default to the working directory.
+                If the repo is not a Git repo, this option is ignored.
+            repo (:obj:`Repo`, optional): `Repo` instance.
+            subrepos (bool): traverse to subrepos.
+                By default, it ignores subrepos.
+            repo_factory (callable): A function to initialize subrepo with.
+                The default is `Repo`.
+
+        Examples:
+            - Opening a filesystem from repo in current working directory
+
+            >>> fs = DVCFileSystem()
+
+            - Opening a filesystem from local repository
+
+            >>> fs = DVCFileSystem("path/to/local/repository")
+
+            - Opening a remote repository
+
+            >>> fs = DVCFileSystem(
+            ...    "https://github.com/iterative/example-get-started",
+            ...    rev="main",
+            ... )
+        """
         from pygtrie import Trie
 
         super().__init__()
@@ -238,7 +263,8 @@ class _DVCFileSystem(AbstractFileSystem):  # pylint:disable=abstract-method
         dvc_path = _get_dvc_path(dvc_fs, subkey)
         return dvc_fs.open(dvc_path, mode=mode)
 
-    def isdvc(self, path, **kwargs):
+    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)
@@ -295,27 +321,6 @@ class _DVCFileSystem(AbstractFileSystem):  # pylint:disable=abstract-method
 
         return infos
 
-    def get_file(  # pylint: disable=arguments-differ
-        self, rpath, lpath, callback=DEFAULT_CALLBACK, **kwargs
-    ):
-        key = self._get_key_from_relative(rpath)
-        fs_path = self._from_key(key)
-        fs = self.repo.fs
-
-        if self.isdir(rpath):
-            makedirs(lpath, exist_ok=True)
-            return None
-
-        try:
-            fs.get_file(fs_path, lpath, callback=callback, **kwargs)
-            return
-        except FileNotFoundError:
-            _, dvc_fs, subkey = self._get_subrepo_info(key)
-            if not dvc_fs:
-                raise
-        dvc_path = _get_dvc_path(dvc_fs, subkey)
-        dvc_fs.get_file(dvc_path, lpath, callback=callback, **kwargs)
-
     def info(self, path, **kwargs):
         key = self._get_key_from_relative(path)
         ignore_subrepos = kwargs.get("ignore_subrepos", True)

dvc/ignore.py

@@ -300,12 +300,25 @@ class DvcIgnoreFilter:
         return [fs_dict[name] for name in chain(dirs, nondirs)]
 
     def walk(self, fs: FileSystem, path: AnyFSPath, **kwargs):
+        detail = kwargs.get("detail", False)
         ignore_subrepos = kwargs.pop("ignore_subrepos", True)
         if fs.protocol == Schemes.LOCAL:
             for root, dirs, files in fs.walk(path, **kwargs):
-                dirs[:], files[:] = self(
-                    root, dirs, files, ignore_subrepos=ignore_subrepos
-                )
+                if detail:
+                    all_dnames = set(dirs.keys())
+                    all_fnames = set(files.keys())
+                    dnames, fnames = self(
+                        root,
+                        all_dnames,
+                        all_fnames,
+                        ignore_subrepos=ignore_subrepos,
+                    )
+                    list(map(dirs.pop, all_dnames - set(dnames)))
+                    list(map(files.pop, all_fnames - set(fnames)))
+                else:
+                    dirs[:], files[:] = self(
+                        root, dirs, files, ignore_subrepos=ignore_subrepos
+                    )
                 yield root, dirs, files
         else:
             yield from fs.walk(path, **kwargs)

dvc/info.py

@@ -76,7 +76,7 @@ def _get_caches(cache):
 
 def _get_remotes(config):
     schemes = (
-        get_fs_cls(get_fs_config(None, config, name=remote)).protocol
+        get_fs_cls(get_fs_config(config, name=remote)).protocol
         for remote in config["remote"]
     )
 

dvc/logger.py

@@ -213,8 +213,6 @@ def set_loggers_level(level: int = logging.INFO) -> None:
 
 
 def setup(level: int = logging.INFO) -> None:
-    colorama.init()
-
     if level >= logging.DEBUG:
         # Unclosed session errors for asyncio/aiohttp are only available
         # on the tracing mode for extensive debug purposes. They are really
@@ -297,3 +295,8 @@ def setup(level: int = logging.INFO) -> None:
             "disable_existing_loggers": False,
         }
     )
+
+    # NOTE: colorama init needs to go after logging config to avoid potential
+    # conflicts with libs that modify logging (like tensorflow/abseil)
+    # https://github.com/iterative/dvc/issues/8387
+    colorama.init()

dvc/machine/backend/base.py

@@ -26,7 +26,7 @@ class BaseMachineBackend(ABC):
     ) -> Iterator[dict]:
         """Iterate over status of all instances of the specified machine."""
 
-    def close(self):
+    def close(self):  # noqa: B027
         pass
 
     @abstractmethod

dvc/output.py

@@ -26,10 +26,12 @@ 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.index import DataIndexEntry
 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 .utils import relpath
 from .utils.fs import path_isin
 
@@ -38,6 +40,8 @@ if TYPE_CHECKING:
     from dvc_data.index import DataIndexKey
     from dvc_objects.db import ObjectDB
 
+    from .fs.callbacks import Callback
+
 logger = logging.getLogger(__name__)
 
 
@@ -83,10 +87,10 @@ def loadd_from(stage, d_list):
         plot = d.pop(Output.PARAM_PLOT, False)
         persist = d.pop(Output.PARAM_PERSIST, False)
         checkpoint = d.pop(Output.PARAM_CHECKPOINT, False)
-        live = d.pop(Output.PARAM_LIVE, 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)
         ret.append(
             _get(
                 stage,
@@ -97,10 +101,10 @@ def loadd_from(stage, d_list):
                 plot=plot,
                 persist=persist,
                 checkpoint=checkpoint,
-                live=live,
                 remote=remote,
                 **annot,
                 files=files,
+                push=push,
             )
         )
     return ret
@@ -114,8 +118,8 @@ def loads_from(
     plot=False,
     persist=False,
     checkpoint=False,
-    live=False,
     remote=None,
+    push=True,
 ):
     return [
         _get(
@@ -127,8 +131,8 @@ def loads_from(
             plot=plot,
             persist=persist,
             checkpoint=checkpoint,
-            live=live,
             remote=remote,
+            push=push,
         )
         for s in s_list
     ]
@@ -162,29 +166,21 @@ def load_from_pipeline(stage, data, typ="outs"):
         stage.PARAM_OUTS,
         stage.PARAM_METRICS,
         stage.PARAM_PLOTS,
-        stage.PARAM_LIVE,
     ):
         raise ValueError(f"'{typ}' key is not allowed for pipeline files.")
 
     metric = typ == stage.PARAM_METRICS
     plot = typ == stage.PARAM_PLOTS
-    live = typ == stage.PARAM_LIVE
-    if live:
-        # `live` is single object
-        data = [data]
 
     d = _merge_data(data)
 
     for path, flags in d.items():
-        plt_d, live_d = {}, {}
+        plt_d = {}
         if plot:
             from dvc.schema import PLOT_PROPS
 
             plt_d, flags = _split_dict(flags, keys=PLOT_PROPS.keys())
-        if live:
-            from dvc.schema import LIVE_PROPS
 
-            live_d, flags = _split_dict(flags, keys=LIVE_PROPS.keys())
         extra = project(
             flags,
             [
@@ -192,6 +188,7 @@ def load_from_pipeline(stage, data, typ="outs"):
                 Output.PARAM_PERSIST,
                 Output.PARAM_CHECKPOINT,
                 Output.PARAM_REMOTE,
+                Output.PARAM_PUSH,
                 *ANNOTATION_FIELDS,
             ],
         )
@@ -202,7 +199,6 @@ def load_from_pipeline(stage, data, typ="outs"):
             info={},
             plot=plt_d or plot,
             metric=metric,
-            live=live_d or live,
             **extra,
         )
 
@@ -259,10 +255,8 @@ class Output:
     PARAM_PLOT_TITLE = "title"
     PARAM_PLOT_HEADER = "header"
     PARAM_PERSIST = "persist"
-    PARAM_LIVE = "live"
-    PARAM_LIVE_SUMMARY = "summary"
-    PARAM_LIVE_HTML = "html"
     PARAM_REMOTE = "remote"
+    PARAM_PUSH = "push"
 
     METRIC_SCHEMA = Any(
         None,
@@ -288,7 +282,6 @@ class Output:
         plot=False,
         persist=False,
         checkpoint=False,
-        live=False,
         desc=None,
         type=None,  # pylint: disable=redefined-builtin
         labels=None,
@@ -297,6 +290,7 @@ class Output:
         repo=None,
         fs_config=None,
         files: List[Dict[str, Any]] = None,
+        push: bool = True,
     ):
         self.annot = Annotation(
             desc=desc, type=type, labels=labels or [], meta=meta or {}
@@ -351,7 +345,7 @@ class Output:
         self.plot = False if self.IS_DEPENDENCY else plot
         self.persist = persist
         self.checkpoint = checkpoint
-        self.live = live
+        self.can_push = push
 
         self.fs_path = self._parse_path(self.fs, fs_path)
         self.obj: Optional["HashFile"] = None
@@ -373,8 +367,12 @@ class Output:
             name=self.hash_name,
             value=getattr(self.meta, self.hash_name, None),
         )
-        if self.hash_info and self.hash_info.isdir:
+        if 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":
+                md5 = getattr(self.meta, "md5", None)
+                if md5:
+                    self.hash_info = HashInfo("md5", md5)
 
     def _parse_path(self, fs, fs_path):
         parsed = urlparse(self.def_path)
@@ -511,6 +509,36 @@ class Output:
             key = self.fs.path.parts(no_drive)[1:]
         return workspace, key
 
+    def get_entry(self) -> "DataIndexEntry":
+        from dvc.config import NoRemoteError
+
+        try:
+            remote = self.repo.cloud.get_remote_odb(self.remote)
+        except NoRemoteError:
+            remote = None
+
+        if self.files and not self.obj:
+            self.obj = self.get_obj()
+
+        entry = DataIndexEntry(
+            meta=self.meta,
+            obj=self.obj,
+            hash_info=self.hash_info,
+            odb=self.odb,
+            cache=self.odb,
+            remote=remote,
+        )
+        if self.stage.is_import and not self.stage.is_repo_import:
+            dep = self.stage.deps[0]
+            entry.fs = dep.fs
+            entry.path = dep.fs_path
+            entry.meta = dep.meta
+            if not entry.obj:
+                if not dep.obj and dep.files:
+                    dep.obj = dep.get_obj()
+                entry.obj = dep.obj
+        return entry
+
     def changed_checksum(self):
         return self.hash_info != self.get_hash()
 
@@ -530,7 +558,7 @@ class Output:
 
     def changed_meta(self) -> bool:
         if self.fs.version_aware and self.meta.version_id:
-            return self.meta.version_id == self.get_meta().version_id
+            return self.meta.version_id != self.get_meta().version_id
         return False
 
     def workspace_status(self):
@@ -610,8 +638,16 @@ class Output:
         if self.metric:
             self.verify_metric()
 
-        if not self.use_cache:
-            _, self.meta, obj = build(
+        if self.use_cache:
+            _, self.meta, self.obj = build(
+                self.odb,
+                self.fs_path,
+                self.fs,
+                self.hash_name,
+                ignore=self.dvcignore,
+            )
+        else:
+            _, self.meta, self.obj = build(
                 self.repo.odb.local,
                 self.fs_path,
                 self.fs,
@@ -619,23 +655,11 @@ class Output:
                 ignore=self.dvcignore,
                 dry_run=True,
             )
-            self.hash_info = obj.hash_info
-            self.files = None
             if not self.IS_DEPENDENCY:
                 logger.debug(
                     "Output '%s' doesn't use cache. Skipping saving.", self
                 )
-            return
 
-        assert not self.IS_DEPENDENCY
-
-        _, self.meta, self.obj = build(
-            self.odb,
-            self.fs_path,
-            self.fs,
-            self.hash_name,
-            ignore=self.dvcignore,
-        )
         self.hash_info = self.obj.hash_info
         self.files = None
 
@@ -733,41 +757,38 @@ class Output:
 
         ret[self.PARAM_PATH] = path
 
-        if self.IS_DEPENDENCY:
-            return ret
+        if not self.IS_DEPENDENCY:
+            ret.update(self.annot.to_dict())
+            if not self.use_cache:
+                ret[self.PARAM_CACHE] = self.use_cache
 
-        ret.update(self.annot.to_dict())
-        if not self.use_cache:
-            ret[self.PARAM_CACHE] = self.use_cache
+            if isinstance(self.metric, dict):
+                if (
+                    self.PARAM_METRIC_XPATH in self.metric
+                    and not self.metric[self.PARAM_METRIC_XPATH]
+                ):
+                    del self.metric[self.PARAM_METRIC_XPATH]
 
-        if isinstance(self.metric, dict):
-            if (
-                self.PARAM_METRIC_XPATH in self.metric
-                and not self.metric[self.PARAM_METRIC_XPATH]
-            ):
-                del self.metric[self.PARAM_METRIC_XPATH]
+            if self.metric:
+                ret[self.PARAM_METRIC] = self.metric
 
-        if self.metric:
-            ret[self.PARAM_METRIC] = self.metric
+            if self.plot:
+                ret[self.PARAM_PLOT] = self.plot
 
-        if self.plot:
-            ret[self.PARAM_PLOT] = self.plot
+            if self.persist:
+                ret[self.PARAM_PERSIST] = self.persist
 
-        if self.persist:
-            ret[self.PARAM_PERSIST] = self.persist
+            if self.checkpoint:
+                ret[self.PARAM_CHECKPOINT] = self.checkpoint
 
-        if self.checkpoint:
-            ret[self.PARAM_CHECKPOINT] = self.checkpoint
+            if self.remote:
+                ret[self.PARAM_REMOTE] = self.remote
 
-        if self.live:
-            ret[self.PARAM_LIVE] = self.live
-
-        if self.remote:
-            ret[self.PARAM_REMOTE] = self.remote
+            if not self.can_push:
+                ret[self.PARAM_PUSH] = self.can_push
 
         if (
-            self.use_cache
-            and self.is_in_repo
+            (not self.IS_DEPENDENCY or self.stage.is_import)
             and self.hash_info.isdir
             and (kwargs.get("with_files") or self.files is not None)
         ):
@@ -800,15 +821,6 @@ class Output:
                 f"binary file '{self.fs_path}' cannot be used as metrics."
             )
 
-    def download(self, to, jobs=None):
-        from dvc.fs.callbacks import Callback
-
-        with Callback.as_tqdm_callback(
-            desc=f"Downloading {self.fs.path.name(self.fs_path)}",
-            unit="files",
-        ) as cb:
-            self.fs.get(self.fs_path, to.fs_path, batch_size=jobs, callback=cb)
-
     def get_obj(
         self, filter_info: Optional[str] = None, **kwargs
     ) -> Optional["HashFile"]:
@@ -828,6 +840,7 @@ class Output:
         else:
             return None
 
+        assert obj
         fs_path = self.fs.path
         if filter_info and filter_info != self.fs_path:
             prefix = fs_path.relparts(filter_info, self.fs_path)
@@ -838,7 +851,7 @@ class Output:
     def checkout(
         self,
         force=False,
-        progress_callback=None,
+        progress_callback: "Callback" = DEFAULT_CALLBACK,
         relink=False,
         filter_info=None,
         allow_missing=False,
@@ -846,9 +859,9 @@ class Output:
         **kwargs,
     ):
         if not self.use_cache:
-            if progress_callback:
-                progress_callback(
-                    self.fs_path, self.get_files_number(filter_info)
+            if progress_callback != DEFAULT_CALLBACK:
+                progress_callback.relative_update(
+                    self.get_files_number(filter_info)
                 )
             return None
 
@@ -1030,9 +1043,15 @@ class Output:
         if not self.use_cache:
             return {}
 
+        push: bool = kwargs.pop("push", False)
         if self.stage.is_repo_import:
+            if push:
+                return {}
             return self.get_used_external(**kwargs)
 
+        if push and not self.can_push:
+            return {}
+
         if not self.hash_info:
             msg = (
                 "Output '{}'({}) is missing version info. "
@@ -1127,7 +1146,7 @@ class Output:
                 "unable to auto-merge outputs that are not directories"
             )
 
-    def merge(self, ancestor, other):
+    def merge(self, ancestor, other, allowed=None):
         from dvc_data.hashfile.tree import MergeError as TreeMergeError
         from dvc_data.hashfile.tree import du, merge
 
@@ -1144,7 +1163,11 @@ class Output:
 
         try:
             merged = merge(
-                self.odb, ancestor_info, self.hash_info, other.hash_info
+                self.odb,
+                ancestor_info,
+                self.hash_info,
+                other.hash_info,
+                allowed=allowed,
             )
         except TreeMergeError as exc:
             raise MergeError(str(exc)) from exc
@@ -1168,11 +1191,39 @@ class Output:
 
     @property
     def is_metric(self) -> bool:
-        return bool(self.metric) or bool(self.live)
+        return bool(self.metric)
 
     @property
     def is_plot(self) -> bool:
-        return bool(self.plot) or bool(self.live)
+        return bool(self.plot)
+
+    def restore_fields(self, other: "Output"):
+        """Restore attributes that need to be preserved when serialized."""
+        self.annot = other.annot
+        self.remote = other.remote
+        self.can_push = other.can_push
+
+    def merge_version_meta(self, other: "Output"):
+        """Merge version meta for files which are unchanged from other."""
+        if not self.hash_info:
+            return
+        if self.hash_info.isdir:
+            return self._merge_dir_version_meta(other)
+        if self.hash_info != other.hash_info:
+            return
+        self.meta = other.meta
+
+    def _merge_dir_version_meta(self, other: "Output"):
+        from dvc_data.hashfile.tree import update_meta
+
+        if not self.obj or not other.hash_info.isdir:
+            return
+        other_obj = other.obj if other.obj is not None else other.get_obj()
+        assert isinstance(self.obj, Tree) and isinstance(other_obj, Tree)
+        updated = update_meta(self.obj, other_obj)
+        assert updated.hash_info == self.obj.hash_info
+        self.obj = updated
+        self.files = updated.as_list(with_meta=True)
 
 
 META_SCHEMA = {
@@ -1203,5 +1254,6 @@ 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/__init__.py

@@ -36,7 +36,7 @@ from .interpolate import (
 )
 
 if TYPE_CHECKING:
-    from typing_extensions import NoReturn
+    from typing import NoReturn
 
     from dvc.repo import Repo
 

dvc/parsing/interpolate.py

@@ -1,3 +1,4 @@
+import os
 import re
 import typing
 from collections.abc import Iterable, Mapping
@@ -9,10 +10,9 @@ from dvc.exceptions import DvcException
 from dvc.utils.flatten import flatten
 
 if typing.TYPE_CHECKING:
-    from typing import List, Match
+    from typing import List, Match, NoReturn
 
     from pyparsing import ParseException
-    from typing_extensions import NoReturn
 
     from .context import Context
 
@@ -71,6 +71,16 @@ def embrace(s: str):
     return BRACE_OPEN + s + BRACE_CLOSE
 
 
+def escape_str(value):
+    if os.name == "nt":
+        from subprocess import list2cmdline
+
+        return list2cmdline([value])
+    from shlex import quote
+
+    return quote(value)
+
+
 @singledispatch
 def to_str(obj) -> str:
     return str(obj)
@@ -98,12 +108,12 @@ def _(obj: dict):
                     result += f"--no-{k} "
 
         elif isinstance(v, str):
-            result += f"--{k} '{v}' "
+            result += f"--{k} {escape_str(v)} "
 
         elif isinstance(v, Iterable):
             for n, i in enumerate(v):
                 if isinstance(i, str):
-                    i = f"'{i}'"
+                    i = escape_str(i)
                 elif isinstance(i, Iterable):
                     raise ParseError(
                         f"Cannot interpolate nested iterable in '{k}'"

dvc/render/convert.py

@@ -2,20 +2,26 @@ import json
 from collections import defaultdict
 from typing import Dict, List, Union
 
-from dvc.render import REVISION_FIELD, REVISIONS_KEY, SRC_FIELD, TYPE_KEY
+from dvc.render import (
+    REVISION_FIELD,
+    REVISIONS_KEY,
+    SRC_FIELD,
+    TYPE_KEY,
+    VERSION_FIELD,
+)
 from dvc.render.converter.image import ImageConverter
 from dvc.render.converter.vega import VegaConverter
 
 
 def _get_converter(
-    renderer_class, props
+    renderer_class, renderer_id, props, data
 ) -> Union[VegaConverter, ImageConverter]:
     from dvc_render import ImageRenderer, VegaRenderer
 
     if renderer_class.TYPE == VegaRenderer.TYPE:
-        return VegaConverter(props)
+        return VegaConverter(renderer_id, data, props)
     if renderer_class.TYPE == ImageRenderer.TYPE:
-        return ImageConverter(props)
+        return ImageConverter(renderer_id, data, props)
 
     raise ValueError(f"Invalid renderer class {renderer_class}")
 
@@ -23,7 +29,7 @@ def _get_converter(
 def _group_by_rev(datapoints):
     grouped = defaultdict(list)
     for datapoint in datapoints:
-        rev = datapoint.pop(REVISION_FIELD)
+        rev = datapoint.get(VERSION_FIELD, {}).get("revision")
         grouped[rev].append(datapoint)
     return dict(grouped)
 

dvc/render/converter/__init__.py

@@ -1,9 +1,19 @@
-from typing import Dict, Optional
+from typing import Any, Dict, List, Optional, Tuple
 
 
 class Converter:
-    def __init__(self, plot_properties: Optional[Dict] = None):
-        self.plot_properties = plot_properties or {}
+    def __init__(
+        self,
+        plot_id: str,
+        data: Dict[str, Any] = None,
+        properties: Optional[Dict] = None,
+    ):
+        self.plot_id = plot_id
+        self.properties = properties or {}
+        self.data = data or {}
 
-    def convert(self, data, revision: str, filename: str, **kwargs):
+    def convert(self) -> Tuple[List[Tuple[str, str, Any]], Dict]:
+        raise NotImplementedError
+
+    def flat_datapoints(self, revision: str) -> Tuple[List[Dict], Dict]:
         raise NotImplementedError

dvc/render/converter/image.py

@@ -1,6 +1,6 @@
 import base64
 import os
-from typing import TYPE_CHECKING, Dict, List, Tuple
+from typing import TYPE_CHECKING, Any, Dict, List, Tuple
 
 from dvc.render import FILENAME_FIELD, REVISION_FIELD, SRC_FIELD
 
@@ -34,25 +34,33 @@ class ImageConverter(Converter):
         base64_str = base64.b64encode(image_data).decode()
         return f"data:image;base64,{base64_str}"
 
-    def convert(
-        self, data, revision: str, filename: str, **kwargs
-    ) -> Tuple[List[Dict], Dict]:
+    def convert(self) -> Tuple[List[Tuple[str, str, Any]], Dict]:
+        datas = []
+        for filename, image_data in self.data.items():
+            datas.append((filename, "", image_data))
+        return datas, self.properties
+
+    def flat_datapoints(self, revision: str) -> Tuple[List[Dict], Dict]:
         """
         Convert the DVC Plots content to DVC Render datapoints.
         Return both generated datapoints and updated properties.
         """
-        path = self.plot_properties.get("out")
-        if path:
-            if not os.path.isdir(path):
-                os.makedirs(path, exist_ok=True)
-            src = self._write_image(
-                os.path.abspath(path), revision, filename, data
-            )
-        else:
-            src = self._encode_image(data)
-        datapoint = {
-            REVISION_FIELD: revision,
-            FILENAME_FIELD: filename,
-            SRC_FIELD: src,
-        }
-        return [datapoint], self.plot_properties
+        path = self.properties.get("out")
+        datapoints = []
+        datas, properties = self.convert()
+        for filename, _, image_data in datas:
+            if path:
+                if not os.path.isdir(path):
+                    os.makedirs(path, exist_ok=True)
+                src = self._write_image(
+                    os.path.abspath(path), revision, filename, image_data
+                )
+            else:
+                src = self._encode_image(image_data)
+            datapoint = {
+                REVISION_FIELD: revision,
+                FILENAME_FIELD: filename,
+                SRC_FIELD: src,
+            }
+            datapoints.append(datapoint)
+        return datapoints, properties

dvc/render/converter/vega.py

@@ -1,90 +1,100 @@
 from copy import deepcopy
-from functools import partial
-from typing import Dict, Iterable, List, Optional, Set, Union
+from typing import Any, Dict, Iterable, List, Tuple, Union
 
-from funcy import first, project
+from funcy import first, last
 
 from dvc.exceptions import DvcException
-from dvc.render import (
-    FILENAME_FIELD,
-    INDEX_FIELD,
-    REVISION_FIELD,
-    VERSION_FIELD,
-)
+from dvc.render import FILENAME_FIELD, INDEX_FIELD, VERSION_FIELD
 
 from . import Converter
 
 
-class FieldsNotFoundError(DvcException):
-    def __init__(self, expected_fields, found_fields):
-        expected_str = ", ".join(expected_fields)
+class FieldNotFoundError(DvcException):
+    def __init__(self, expected_field, found_fields):
         found_str = ", ".join(found_fields)
         super().__init__(
-            f"Could not find all provided fields ('{expected_str}') "
+            f"Could not find provided field ('{expected_field}') "
             f"in data fields ('{found_str}')."
         )
 
 
-class PlotDataStructureError(DvcException):
-    def __init__(self):
-        super().__init__(
-            "Plot data extraction failed. Please see "
-            "https://man.dvc.org/plots for supported data formats."
-        )
+def _lists(blob: Union[Dict, List]) -> Iterable[List]:
+    if isinstance(blob, list):
+        yield blob
+    else:
+        for _, value in blob.items():
+            if isinstance(value, dict):
+                yield from _lists(value)
+            elif isinstance(value, list):
+                yield value
 
 
-def _filter_fields(
-    datapoints: List[Dict], fields: Set, **kwargs
-) -> List[Dict]:
-    if not fields:
-        return datapoints
-    assert isinstance(fields, set)
-
-    new_data = []
-    for data_point in datapoints:
-        keys = set(data_point.keys())
-        if not fields <= keys:
-            raise FieldsNotFoundError(fields, keys)
-
-        new_data.append(project(data_point, fields))
-
-    return new_data
+def _file_field(*args):
+    for axis_def in args:
+        if axis_def is not None:
+            for file, val in axis_def.items():
+                if isinstance(val, str):
+                    yield file, val
+                elif isinstance(val, list):
+                    for field in val:
+                        yield file, field
 
 
-def _lists(dictionary: Dict):
-    for _, value in dictionary.items():
-        if isinstance(value, dict):
-            yield from _lists(value)
-        elif isinstance(value, list):
-            yield value
+def _find(
+    filename: str,
+    field: str,
+    data_series: List[Tuple[str, str, Any]],
+):
+    for data_file, data_field, data in data_series:
+        if data_file == filename and data_field == field:
+            return data_file, data_field, data
+    return None
 
 
-def _find_first_list(
-    data: Union[Dict, List], fields: Set, **kwargs
-) -> List[Dict]:
-    fields = fields or set()
-
-    if not isinstance(data, dict):
-        return data
-
-    for lst in _lists(data):
-        if (
-            all(isinstance(dp, dict) for dp in lst)
-            # if fields is empty, it will match any set
-            and set(first(lst).keys()) & fields == fields
-        ):
-            return lst
-
-    raise PlotDataStructureError()
+def _verify_field(file2datapoints: Dict[str, List], filename: str, field: str):
+    if filename in file2datapoints:
+        datapoint = first(file2datapoints[filename])
+        if field not in datapoint:
+            raise FieldNotFoundError(field, datapoint.keys())
+    return
 
 
-def _append_index(datapoints: List[Dict], **kwargs) -> List[Dict]:
-    if INDEX_FIELD in first(datapoints).keys():
-        return datapoints
+def _get_xs(properties: Dict, file2datapoints: Dict[str, List[Dict]]):
+    x = properties.get("x", None)
+    if x is not None and isinstance(x, dict):
+        for filename, field in _file_field(x):
+            _verify_field(file2datapoints, filename, field)
+            yield filename, field
 
-    for index, data_point in enumerate(datapoints):
-        data_point[INDEX_FIELD] = index
-    return datapoints
+
+def _get_ys(properties, file2datapoints: Dict[str, List[Dict]]):
+    y = properties.get("y", None)
+    if y is not None:
+        for filename, field in _file_field(y):
+            _verify_field(file2datapoints, filename, field)
+            yield filename, field
+
+
+def _is_datapoints(lst: List[Dict]):
+    """
+    check if dict keys match, datapoints with different keys mgiht lead
+    to unexpected behavior
+    """
+
+    return all(isinstance(item, dict) for item in lst) and set(
+        first(lst).keys()
+    ) == {key for keys in lst for key in keys}
+
+
+def get_datapoints(file_content: Dict):
+    result: List[Dict[str, Any]] = []
+    for lst in _lists(file_content):
+        if _is_datapoints(lst):
+            for index, datapoint in enumerate(lst):
+                if len(result) <= index:
+                    result.append({})
+                result[index].update(datapoint)
+    return result
 
 
 class VegaConverter(Converter):
@@ -95,222 +105,225 @@ class VegaConverter(Converter):
     ('x', 'y') it will attempt to fill in the blanks.
     """
 
-    def __init__(self, plot_properties: Optional[Dict] = None):
-        super().__init__(plot_properties)
+    def __init__(
+        self, plot_id: str, data: Dict = None, properties: Dict = None
+    ):
+        super().__init__(plot_id, data, properties)
+        self.plot_id = plot_id
         self.inferred_properties: Dict = {}
 
-        self.steps = []
+        # TODO we should be handling that in `convert`,
+        #      to avoid stateful `self.inferred_properties`
+        self._infer_x_y()
 
-        self._infer_x()
-        self._infer_fields()
+    def _infer_y_from_data(self):
+        if self.plot_id in self.data:
+            for lst in _lists(self.data[self.plot_id]):
+                if all(isinstance(item, dict) for item in lst):
+                    datapoint = first(lst)
+                    field = last(datapoint.keys())
+                    self.inferred_properties["y"] = {self.plot_id: field}
+                    break
 
-        self.steps.append(
-            (
-                "find_data",
-                partial(
-                    _find_first_list,
-                    fields=self.inferred_properties.get("fields", set())
-                    - {INDEX_FIELD},
-                ),
-            )
-        )
+    def _infer_x_y(self):
+        def _infer_files(from_name, to_name):
+            from_value = self.properties.get(from_name, None)
+            to_value = self.properties.get(to_name, None)
 
-        if not self.plot_properties.get("x", None):
-            self.steps.append(("append_index", partial(_append_index)))
-
-        self.steps.append(
-            (
-                "filter_fields",
-                partial(
-                    _filter_fields,
-                    fields=self.inferred_properties.get("fields", set()),
-                ),
-            )
-        )
-
-        self.steps.append(
-            (
-                "generate_y",
-                partial(
-                    self._generate_y_values,
-                    y_values=self.plot_properties.get("y", None),
-                ),
-            )
-        )
-
-    def _infer_x(self):
-        if not self.plot_properties.get("x", None):
-            self.inferred_properties["x"] = INDEX_FIELD
-
-    def skip_step(self, name: str):
-        self.steps = [(_name, fn) for _name, fn in self.steps if _name != name]
-
-    def _infer_fields(self):
-        fields = self.plot_properties.get("fields", set())
-        if fields:
-            fields = {
-                *fields,
-                self.plot_properties.get("x", None),
-                self.plot_properties.get("y", None),
-                self.inferred_properties.get("x", None),
-            } - {None}
-            self.inferred_properties["fields"] = fields
-
-    def _infer_y(self, datapoints: List[Dict]):
-        if "y" not in self.plot_properties:
-            data_fields = list(first(datapoints))
-            skip = (
-                REVISION_FIELD,
-                self.plot_properties.get("x", None)
-                or self.inferred_properties.get("x"),
-                FILENAME_FIELD,
-                VERSION_FIELD,
-            )
-            inferred_y = first(
-                f for f in reversed(data_fields) if f not in skip
-            )
-            if "y" in self.inferred_properties:
-                previous_y = self.inferred_properties["y"]
-                if previous_y != inferred_y:
-                    raise DvcException(
-                        f"Inferred y ('{inferred_y}' value does not match"
-                        f"previously matched one ('f{previous_y}')."
-                    )
+            if isinstance(to_value, str):
+                self.inferred_properties[to_name] = {}
+                if isinstance(from_value, dict):
+                    for file in from_value.keys():
+                        self.inferred_properties[to_name][file] = to_value
+                else:
+                    self.inferred_properties[to_name][self.plot_id] = to_value
             else:
-                self.inferred_properties["y"] = inferred_y
+                self.inferred_properties[to_name] = to_value
+
+        _infer_files("y", "x")
+        _infer_files("x", "y")
+
+        if self.inferred_properties.get("y", None) is None:
+            self._infer_y_from_data()
+
+    def _find_datapoints(self):
+        result = {}
+        for file, content in self.data.items():
+            result[file] = get_datapoints(content)
+
+        return result
+
+    @staticmethod
+    def infer_y_label(properties):
+        y_label = properties.get("y_label", None)
+        if y_label is None:
+            y = properties.get("y", None)
+            if isinstance(y, dict):
+                fields = {field for _, field in _file_field(y)}
+                if len(fields) == 1:
+                    y_label = first(fields)
+                else:
+                    y_label = "y"
+            elif isinstance(y, list):
+                y_label = "y"
+            elif isinstance(y, str):
+                y_label = y
+
+        return y_label
+
+    @staticmethod
+    def infer_x_label(properties):
+        x_label = properties.get("x_label", None)
+        if x_label is None:
+            x = properties.get("x", None)
+            if isinstance(x, dict):
+                fields = {field for _, field in _file_field(x)}
+                if len(fields) == 1:
+                    x_label = first(fields)
+                else:
+                    x_label = "x"
+            else:
+                x_label = INDEX_FIELD
+        return x_label
+
+    def flat_datapoints(self, revision):
+
+        file2datapoints, properties = self.convert()
+
+        props_update = {}
+
+        xs = list(_get_xs(properties, file2datapoints))
+
+        # assign "step" if no x provided
+        if not xs:
+            x_file, x_field = (
+                None,
+                INDEX_FIELD,
+            )
+        else:
+            x_file, x_field = xs[0]
+        props_update["x"] = x_field
+
+        ys = list(_get_ys(properties, file2datapoints))
+
+        num_xs = len(xs)
+        num_ys = len(ys)
+        if num_xs > 1 and num_xs != num_ys:
+            raise DvcException(
+                f"Cannot have different number of x and y data sources. Found "
+                f"{num_xs} x and {num_ys} y data sources."
+            )
+
+        all_datapoints = []
+        all_y_fields = {y_field for _, y_field in ys}
+
+        # override to unified y field name if there are different y fields
+        if len(all_y_fields) > 1:
+            props_update["y"] = "dvc_inferred_y_value"
+        else:
+            props_update["y"] = first(all_y_fields)
+
+        for i, (y_file, y_field) in enumerate(ys):
+            if num_xs > 1:
+                x_file, x_field = xs[i]
+            datapoints = deepcopy(file2datapoints.get(y_file, []))
+
+            if props_update.get("y", None) == "dvc_inferred_y_value":
+                _update_from_field(
+                    datapoints,
+                    field="dvc_inferred_y_value",
+                    source_field=y_field,
+                )
+
+            if x_field == INDEX_FIELD and x_file is None:
+                _update_from_index(datapoints, INDEX_FIELD)
+            else:
+                x_datapoints = file2datapoints.get(x_file, [])
+                try:
+                    _update_from_field(
+                        datapoints,
+                        field=x_field,
+                        source_datapoints=x_datapoints,
+                    )
+                except IndexError:
+                    raise DvcException(
+                        f"Cannot join '{x_field}' from '{x_file}' and "
+                        f"'{y_field}' from '{y_file}'. "
+                        "They have to have same length."
+                    )
+
+            _update_all(
+                datapoints,
+                update_dict={
+                    VERSION_FIELD: {
+                        "revision": revision,
+                        FILENAME_FIELD: y_file,
+                        "field": y_field,
+                    }
+                },
+            )
+
+            all_datapoints.extend(datapoints)
+
+        if not all_datapoints:
+            return [], {}
+
+        properties = {**properties, **props_update}
+
+        return all_datapoints, properties
 
     def convert(
         self,
-        data,
-        revision: str,
-        filename: str,
-        skip: List = None,
-        **kwargs,
     ):
         """
         Convert the data. Fill necessary fields ('x', 'y') and return both
-        generated datapoints and updated properties.
+        generated datapoints and updated properties. If `x` is not provided,
+        leave it as None, fronteds should handle it.
+
+        NOTE: Studio uses this method.
+              The only thing studio FE handles is filling `x` and `y`.
+              `x/y_label` should be filled here.
+
+              Datapoints are not stripped according to config, because users
+              might be utilizing other fields in their custom plots.
         """
-        if not skip:
-            skip = []
+        datapoints = self._find_datapoints()
+        properties = {**self.properties, **self.inferred_properties}
 
-        processed = deepcopy(data)
+        properties["y_label"] = self.infer_y_label(properties)
+        properties["x_label"] = self.infer_x_label(properties)
 
-        for step_name, step in self.steps:
+        return datapoints, properties
 
-            if step_name not in skip:
-                processed = step(  # type: ignore
-                    processed,
-                    revision=revision,
-                    filename=filename,
-                )
 
-        self._infer_y(processed)  # type: ignore
-        return processed, {**self.plot_properties, **self.inferred_properties}
+def _update_from_field(
+    target_datapoints: List[Dict],
+    field: str,
+    source_datapoints: List[Dict] = None,
+    source_field: str = None,
+):
+    if source_datapoints is None:
+        source_datapoints = target_datapoints
+    if source_field is None:
+        source_field = field
 
-    def _generate_y_values(  # noqa: C901
-        self,
-        datapoints: List[Dict],
-        y_values: Optional[Union[str, List, Dict]],
-        revision: str,
-        filename: str,
-        **kwargs,
-    ) -> List[Dict]:
+    if len(source_datapoints) != len(target_datapoints):
+        raise IndexError(
+            "Source and target datapoints must have the same length"
+        )
 
-        result = []
-        properties_update = {}
+    for index, datapoint in enumerate(target_datapoints):
+        source_datapoint = source_datapoints[index]
+        if source_field in source_datapoint:
+            datapoint[field] = source_datapoint[source_field]
 
-        def _add_version_info(datapoint, version_info):
-            tmp = datapoint.copy()
-            tmp[VERSION_FIELD] = version_info
-            tmp[REVISION_FIELD] = version_info["revision"]
-            return tmp
 
-        def _version_info(revision, filename=None, field=None):
-            res = {"revision": revision}
-            if filename is not None:
-                res["filename"] = filename
-            if field is not None:
-                res["field"] = field
-            return res
+def _update_from_index(datapoints: List[Dict], new_field: str):
+    for index, datapoint in enumerate(datapoints):
+        datapoint[new_field] = index
 
-        def _generate_y(datapoint, field):
-            tmp = datapoint.copy()
-            tmp["dvc_inferred_y_value"] = datapoint[field]
-            tmp = _add_version_info(
-                tmp, _version_info(revision, filename, field)
-            )
-            if (
-                "y_label" not in properties_update
-                and "y_label" not in self.plot_properties
-            ):
-                properties_update["y_label"] = "y"
 
-            properties_update["y"] = "dvc_inferred_y_value"
+def _update_all(datapoints: List[Dict], update_dict: Dict):
 
-            return tmp
-
-        if not y_values:
-            for dp in datapoints:
-                result.append(
-                    _add_version_info(dp, _version_info(revision, filename))
-                )
-
-        if isinstance(y_values, str):
-            for datapoint in datapoints:
-                result.append(
-                    _add_version_info(
-                        datapoint, _version_info(revision, filename, y_values)
-                    )
-                )
-
-        if isinstance(y_values, list):
-            for datapoint in datapoints:
-                for y_val in y_values:
-                    if y_val in datapoint:
-                        result.append(_generate_y(datapoint, y_val))
-
-        if isinstance(y_values, dict):
-
-            def _to_set(values: Iterable):
-                result = set()
-                for val in values:
-                    if isinstance(val, list):
-                        for elem in val:
-                            result.add(elem)
-                    else:
-                        result.add(val)
-
-                return result
-
-            all_fields = _to_set(y_values.values())
-            if (
-                all([isinstance(field, str) for field in all_fields])
-                and len(all_fields) == 1
-            ):
-                # if we use the same field from all files,
-                # we dont have to generate it
-                for datapoint in datapoints:
-                    result.append(
-                        _add_version_info(
-                            datapoint, _version_info(revision, filename)
-                        )
-                    )
-                properties_update.update({"y": all_fields.pop()})
-            else:
-                for def_filename, val in y_values.items():
-                    if isinstance(val, str):
-                        fields = [val]
-                    if isinstance(val, list):
-                        fields = val
-                    for datapoint in datapoints:
-                        for field in fields:
-                            if field in datapoint and def_filename in filename:
-                                result.append(_generate_y(datapoint, field))
-
-        self.inferred_properties = {
-            **self.inferred_properties,
-            **properties_update,
-        }
-
-        return result
+    for datapoint in datapoints:
+        datapoint.update(update_dict)

dvc/render/match.py

@@ -42,7 +42,7 @@ class PlotsData:
         return dict(groups)
 
     def get_definition_data(self, target_files, rev):
-        result = []
+        result = {}
         for file in target_files:
             file_content = (
                 self.data.get(rev, {})
@@ -52,7 +52,7 @@ class PlotsData:
                 .get("data", {})
             )
             if file_content:
-                result.append((file, file_content))
+                result[file] = file_content
 
         return result
 
@@ -91,15 +91,14 @@ def match_defs_renderers(
                 renderer_cls = VegaRenderer
                 renderer_id = plot_id
 
-            converter = _get_converter(renderer_cls, props)
+            converter = _get_converter(
+                renderer_cls, inner_id, props, definitions_data
+            )
 
-            for filename, plot_data in definitions_data:
-                dps, final_props = converter.convert(
-                    revision=rev,
-                    filename=filename,
-                    data=plot_data,
-                )
-                plot_datapoints.extend(dps)
+            dps, rev_props = converter.flat_datapoints(rev)
+            if not final_props and rev_props:
+                final_props = rev_props
+            plot_datapoints.extend(dps)
 
         if "title" not in final_props:
             final_props["title"] = renderer_id

dvc/repo/__init__.py

@@ -3,7 +3,7 @@ import os
 from collections import defaultdict
 from contextlib import contextmanager
 from functools import wraps
-from typing import TYPE_CHECKING, Callable, List, Optional
+from typing import TYPE_CHECKING, Callable, Optional
 
 from funcy import cached_property
 
@@ -18,7 +18,6 @@ if TYPE_CHECKING:
     from dvc.fs import FileSystem
     from dvc.repo.scm_context import SCMContext
     from dvc.scm import Base
-    from dvc.stage import Stage
 
 logger = logging.getLogger(__name__)
 
@@ -68,6 +67,7 @@ class Repo:
     from dvc.repo.imp_url import imp_url  # type: ignore[misc]
     from dvc.repo.install import install  # type: ignore[misc]
     from dvc.repo.ls import ls as _ls  # type: ignore[misc]
+    from dvc.repo.ls_url import ls_url as _ls_url  # type: ignore[misc]
     from dvc.repo.move import move  # type: ignore[misc]
     from dvc.repo.pull import pull  # type: ignore[misc]
     from dvc.repo.push import push  # type: ignore[misc]
@@ -80,6 +80,7 @@ class Repo:
     from .data import status as data_status  # type: ignore[misc]
 
     ls = staticmethod(_ls)
+    ls_url = staticmethod(_ls_url)
     get = staticmethod(_get)
     get_url = staticmethod(_get_url)
 
@@ -268,7 +269,7 @@ class Repo:
         except SCMError:
             if self._uninitialized:
                 # might not be a git/dvc repo at all
-                # used in `params/metrics/plots/live` targets
+                # used in `params/metrics/plots` targets
                 return SCM(self.root_dir, no_scm=True)
             raise
 
@@ -400,6 +401,7 @@ class Repo:
         used_run_cache=None,
         revs=None,
         num=1,
+        push: bool = False,
     ):
         """Get the stages related to the given target and collect
         the `info` of its outputs.
@@ -434,6 +436,7 @@ class Repo:
                 jobs=jobs,
                 recursive=recursive,
                 with_deps=with_deps,
+                push=push,
             ).items():
                 used[odb].update(objs)
 
@@ -445,44 +448,6 @@ class Repo:
 
         return used
 
-    def partial_imports(
-        self,
-        targets=None,
-        all_branches=False,
-        all_tags=False,
-        all_commits=False,
-        all_experiments=False,
-        commit_date: Optional[str] = None,
-        recursive=False,
-        revs=None,
-        num=1,
-    ) -> List["Stage"]:
-        """Get the stages related to the given target and collect dependencies
-        which are missing outputs.
-
-        This is useful to retrieve files which have been imported to the repo
-        using --no-download.
-
-        Returns:
-            A list of partially imported stages
-        """
-        from itertools import chain
-
-        partial_imports = chain.from_iterable(
-            self.index.partial_imports(targets, recursive=recursive)
-            for _ in self.brancher(
-                revs=revs,
-                all_branches=all_branches,
-                all_tags=all_tags,
-                all_commits=all_commits,
-                all_experiments=all_experiments,
-                commit_date=commit_date,
-                num=num,
-            )
-        )
-
-        return list(partial_imports)
-
     @property
     def stages(self):  # obsolete, only for backward-compatibility
         return self.index.stages

dvc/repo/add.py

@@ -187,7 +187,7 @@ def add(  # noqa: C901
                 stage.transfer(source, to_remote=to_remote, odb=odb, **kwargs)
             else:
                 try:
-                    stage.save()
+                    stage.save(merge_versioned=True)
                     if not no_commit:
                         stage.commit()
                 except CacheLinkError:

dvc/repo/brancher.py

@@ -77,6 +77,7 @@ def brancher(  # noqa: E302
         from dvc.fs import GitFileSystem
 
         for sha, names in found_revs.items():
+            self.__dict__.pop("index", None)
             self.fs = GitFileSystem(scm=scm, rev=sha)
             self.root_dir = self.fs.path.join("/", *repo_root_parts)
 

dvc/repo/checkout.py

@@ -7,7 +7,6 @@ from dvc.exceptions import (
     CheckoutErrorSuggestGit,
     NoOutputOrStageError,
 )
-from dvc.progress import Tqdm
 from dvc.utils import relpath
 
 from . import locked
@@ -80,6 +79,7 @@ def checkout(
     allow_missing=False,
     **kwargs,
 ):
+    from dvc.fs.callbacks import Callback
 
     stats = {"added": [], "deleted": [], "modified": [], "failed": []}
     if not targets:
@@ -91,13 +91,16 @@ def checkout(
 
     pairs = _collect_pairs(self, targets, with_deps, recursive)
     total = get_all_files_numbers(pairs)
-    with Tqdm(
-        total=total, unit="file", desc="Checkout", disable=total == 0
-    ) as pbar:
+    with Callback.as_tqdm_callback(
+        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=pbar.update_msg,
+                progress_callback=cb,
                 relink=relink,
                 filter_info=filter_info,
                 allow_missing=allow_missing,

dvc/repo/commit.py

@@ -56,10 +56,13 @@ def commit(
     ]
     for stage_info in stages_info:
         stage = stage_info.stage
-        changes = stage.changed_entries()
-        if any(changes):
-            prompt_to_commit(stage, changes, force=force)
+        if force:
             stage.save(allow_missing=allow_missing)
+        else:
+            changes = stage.changed_entries()
+            if any(changes):
+                prompt_to_commit(stage, changes, force=force)
+                stage.save(allow_missing=allow_missing)
         stage.commit(
             filter_info=stage_info.filter_info, allow_missing=allow_missing
         )

dvc/repo/data.py

@@ -12,6 +12,7 @@ from typing import (
     Optional,
     Tuple,
     TypedDict,
+    Union,
     cast,
 )
 
@@ -19,10 +20,9 @@ from dvc.fs.git import GitFileSystem
 from dvc.ui import ui
 
 if TYPE_CHECKING:
-    from scmrepo.base import Base
-
     from dvc.output import Output
     from dvc.repo import Repo
+    from dvc.scm import Git, NoSCM
     from dvc_data.hashfile.db import HashFileDB
     from dvc_data.hashfile.hash_info import HashInfo
     from dvc_data.hashfile.obj import HashFile
@@ -140,7 +140,9 @@ class GitInfo(TypedDict, total=False):
     is_dirty: bool
 
 
-def _git_info(scm: "Base", untracked_files: str = "all") -> GitInfo:
+def _git_info(
+    scm: Union["Git", "NoSCM"], untracked_files: str = "all"
+) -> GitInfo:
     from scmrepo.exceptions import SCMError
 
     from dvc.scm import NoSCM

dvc/repo/experiments/__init__.py

@@ -2,9 +2,9 @@ import logging
 import os
 import re
 import time
-from typing import Any, Dict, Iterable, Optional
+from typing import Dict, Iterable, Optional
 
-from funcy import cached_property, first
+from funcy import cached_property, chain, first
 
 from dvc.exceptions import DvcException
 from dvc.ui import ui
@@ -16,7 +16,7 @@ from .exceptions import (
     InvalidExpRefError,
     MultipleBranchError,
 )
-from .executor.base import BaseExecutor, ExecutorInfo
+from .executor.base import BaseExecutor
 from .queue.base import BaseStashQueue, QueueEntry
 from .queue.celery import LocalCeleryQueue
 from .queue.tempdir import TempDirQueue
@@ -25,7 +25,6 @@ from .refs import (
     CELERY_FAILED_STASH,
     CELERY_STASH,
     EXEC_APPLY,
-    EXEC_BRANCH,
     EXEC_CHECKPOINT,
     EXEC_NAMESPACE,
     EXPS_NAMESPACE,
@@ -33,7 +32,7 @@ from .refs import (
     ExpRefInfo,
 )
 from .stash import ExpStashEntry
-from .utils import exp_refs_by_rev, scm_locked, unlocked_repo
+from .utils import exp_refs_by_rev, unlocked_repo
 
 logger = logging.getLogger(__name__)
 
@@ -51,18 +50,12 @@ class Experiments:
     )
 
     def __init__(self, repo):
-        from dvc.lock import make_lock
         from dvc.scm import NoSCMError
 
         if repo.config["core"].get("no_scm", False):
             raise NoSCMError
 
         self.repo = repo
-        self.scm_lock = make_lock(
-            os.path.join(self.repo.tmp_dir, "exp_scm_lock"),
-            tmp_dir=self.repo.tmp_dir,
-            hardlink_lock=repo.config["core"].get("hardlink_lock", False),
-        )
 
     @property
     def scm(self):
@@ -172,7 +165,18 @@ class Experiments:
     ) -> Dict[str, str]:
         results: Dict[str, str] = {}
         if entries is None:
-            entries = list(self.celery_queue.iter_queued())
+            entries = list(
+                chain(
+                    self.celery_queue.iter_active(),
+                    self.celery_queue.iter_queued(),
+                )
+            )
+
+        logger.debug(
+            "reproduce all these entries '%s'",
+            entries,
+        )
+
         if not entries:
             return results
 
@@ -190,7 +194,10 @@ class Experiments:
                     time.sleep(1)
                 self.celery_queue.follow(entry)
                 # wait for task collection to complete
-                result = self.celery_queue.get_result(entry)
+                try:
+                    result = self.celery_queue.get_result(entry)
+                except FileNotFoundError:
+                    result = None
                 if result is None or result.exp_hash is None:
                     name = entry.name or entry.stash_rev[:7]
                     failed.append(name)
@@ -211,8 +218,9 @@ class Experiments:
 
     def _log_reproduced(self, revs: Iterable[str], tmp_dir: bool = False):
         names = []
+        rev_names = self.get_exact_name(revs)
         for rev in revs:
-            name = self.get_exact_name(rev)
+            name = rev_names[rev]
             names.append(name if name else rev[:7])
         ui.write("\nRan experiment(s): {}".format(", ".join(names)))
         if tmp_dir:
@@ -239,7 +247,6 @@ class Experiments:
         if self.scm.get_ref(str(exp_ref)):
             raise ExperimentExistsError(exp_ref.name)
 
-    @scm_locked
     def new(
         self,
         queue: BaseStashQueue,
@@ -265,7 +272,6 @@ class Experiments:
         except ExperimentExistsError as err:
             if not (kwargs.get("force", False) or kwargs.get("reset", False)):
                 raise err
-
         return queue.put(*args, **kwargs)
 
     def _resume_checkpoint(
@@ -411,86 +417,41 @@ class Experiments:
             raise MultipleBranchError(rev, ref_infos)
         return str(ref_infos[0])
 
-    def get_exact_name(self, rev: str):
+    def get_exact_name(self, revs: Iterable[str]) -> Dict[str, Optional[str]]:
         """Returns preferred name for the specified revision.
 
         Prefers tags, branches (heads), experiments in that orer.
         """
+        result: Dict[str, Optional[str]] = {}
         exclude = f"{EXEC_NAMESPACE}/*"
-        ref = self.scm.describe(rev, base=EXPS_NAMESPACE, exclude=exclude)
-        if ref:
-            try:
-                name = ExpRefInfo.from_ref(ref).name
-                if name:
-                    return name
-            except InvalidExpRefError:
-                pass
-        if rev in self.stash_revs:
-            return self.stash_revs[rev].name
-        return None
-
-    def get_running_exps(self, fetch_refs: bool = True) -> Dict[str, Any]:
-        """Return info for running experiments."""
-        result = {}
-        infofile = self.workspace_queue.get_infofile_path("workspace")
-        result.update(
-            self._fetch_running_exp("workspace", infofile, fetch_refs)
+        ref_dict = self.scm.describe(
+            revs, base=EXPS_NAMESPACE, exclude=exclude
         )
-        for queue in (self.tempdir_queue, self.celery_queue):
-            for entry in queue.iter_active():
-                infofile = queue.get_infofile_path(entry.stash_rev)
-                result.update(
-                    self._fetch_running_exp(
-                        entry.stash_rev, infofile, fetch_refs
-                    )
-                )
+        for rev in revs:
+            name: Optional[str] = None
+            ref = ref_dict[rev]
+            if ref:
+                try:
+                    name = ExpRefInfo.from_ref(ref).name
+                except InvalidExpRefError:
+                    pass
+            if not name:
+                if rev in self.stash_revs:
+                    name = self.stash_revs[rev].name
+                elif rev in self.celery_queue.failed_stash.stash_revs:
+                    name = self.celery_queue.failed_stash.stash_revs[rev].name
+            result[rev] = name
         return result
 
-    def _fetch_running_exp(
-        self, rev: str, infofile: str, fetch_refs: bool
-    ) -> Dict[str, Any]:
-        from dvc.scm import InvalidRemoteSCMRepo
-        from dvc.utils.serialize import load_json
-
-        from .executor.local import TempDirExecutor
-
-        result: Dict[str, Any] = {}
-        try:
-            info = ExecutorInfo.from_dict(load_json(infofile))
-        except OSError:
-            return result
-        if info.result is None:
-            if rev == "workspace":
-                # If we are appending to a checkpoint branch in a workspace
-                # run, show the latest checkpoint as running.
-                last_rev = self.scm.get_ref(EXEC_BRANCH)
-                if last_rev:
-                    result[last_rev] = info.asdict()
-                else:
-                    result[rev] = info.asdict()
-            else:
-                result[rev] = info.asdict()
-                if info.git_url and fetch_refs:
-
-                    def on_diverged(_ref: str, _checkpoint: bool):
-                        return False
-
-                    executor = TempDirExecutor.from_info(info)
-                    try:
-                        for ref in executor.fetch_exps(
-                            self.scm,
-                            on_diverged=on_diverged,
-                        ):
-                            logger.debug(
-                                "Updated running experiment '%s'.", ref
-                            )
-                            last_rev = self.scm.get_ref(ref)
-                            result[rev]["last"] = last_rev
-                            if last_rev:
-                                result[last_rev] = info.asdict()
-                    except InvalidRemoteSCMRepo:
-                        # ignore stale info files
-                        del result[rev]
+    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):
@@ -518,6 +479,11 @@ class Experiments:
 
         return run(self.repo, *args, **kwargs)
 
+    def save(self, *args, **kwargs):
+        from dvc.repo.experiments.save import save
+
+        return save(self.repo, *args, **kwargs)
+
     def gc(self, *args, **kwargs):
         from dvc.repo.experiments.gc import gc
 

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.show import collect_experiment_commit
     from dvc.scm import resolve_rev
 
     if repo.scm.no_commits:
@@ -15,15 +15,15 @@ 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)
+        old = collect_experiment_commit(repo, rev, param_deps=param_deps)
     else:
-        old = _collect_experiment_commit(repo, "HEAD", param_deps=param_deps)
+        old = collect_experiment_commit(repo, "HEAD", param_deps=param_deps)
 
     if b_rev:
         rev = resolve_rev(repo.scm, b_rev)
-        new = _collect_experiment_commit(repo, rev, param_deps=param_deps)
+        new = collect_experiment_commit(repo, rev, param_deps=param_deps)
     else:
-        new = _collect_experiment_commit(
+        new = collect_experiment_commit(
             repo, "workspace", param_deps=param_deps
         )
 

dvc/repo/experiments/executor/base.py

@@ -4,6 +4,7 @@ import pickle
 from abc import ABC, abstractmethod
 from contextlib import contextmanager
 from dataclasses import asdict, dataclass
+from enum import IntEnum
 from functools import partial
 from typing import (
     TYPE_CHECKING,
@@ -11,6 +12,7 @@ from typing import (
     Callable,
     Dict,
     Iterable,
+    List,
     NamedTuple,
     Optional,
     Tuple,
@@ -19,6 +21,8 @@ from typing import (
     Union,
 )
 
+from scmrepo.exceptions import SCMError
+
 from dvc.env import DVC_EXP_AUTO_PUSH, DVC_EXP_GIT_REMOTE
 from dvc.exceptions import DvcException
 from dvc.stage.serialize import to_lockfile
@@ -31,15 +35,7 @@ from ..exceptions import (
     ExperimentExistsError,
     UnchangedExperimentError,
 )
-from ..refs import (
-    EXEC_BASELINE,
-    EXEC_BRANCH,
-    EXEC_CHECKPOINT,
-    EXEC_NAMESPACE,
-    EXPS_NAMESPACE,
-    EXPS_STASH,
-    ExpRefInfo,
-)
+from ..refs import EXEC_BASELINE, EXEC_BRANCH, EXEC_CHECKPOINT, ExpRefInfo
 
 if TYPE_CHECKING:
     from queue import Queue
@@ -47,23 +43,28 @@ if TYPE_CHECKING:
     from scmrepo.git import Git
 
     from dvc.repo import Repo
+    from dvc.repo.experiments.stash import ExpStashEntry
     from dvc.stage import PipelineStage
 
-    from ..base import ExpStashEntry
-
 logger = logging.getLogger(__name__)
 
 
-EXEC_TMP_DIR = "exps"
-EXEC_PID_DIR = "run"
-
-
 class ExecutorResult(NamedTuple):
     exp_hash: Optional[str]
     ref_info: Optional["ExpRefInfo"]
     force: bool
 
 
+class TaskStatus(IntEnum):
+    PENDING = 0
+    PREPARING = 1
+    RUNNING = 2
+    SUCCESS = 3
+    FAILED = 4
+    CANCELED = 5
+    FINISHED = 6
+
+
 @dataclass
 class ExecutorInfo:
     git_url: str
@@ -73,13 +74,16 @@ class ExecutorInfo:
     dvc_dir: str
     name: Optional[str] = None
     wdir: Optional[str] = None
-    collected: bool = False
     result_hash: Optional[str] = None
     result_ref: Optional[str] = None
     result_force: bool = False
+    status: TaskStatus = TaskStatus.PENDING
 
     @classmethod
     def from_dict(cls, d):
+        if "collected" in d:
+            if d.pop("collected"):
+                d["status"] = TaskStatus.FINISHED
         return cls(**d)
 
     def asdict(self):
@@ -136,6 +140,7 @@ class BaseExecutor(ABC):
         root_dir: str,
         dvc_dir: str,
         baseline_rev: str,
+        status: TaskStatus,
         wdir: Optional[str] = None,
         name: Optional[str] = None,
         location: Optional[str] = None,
@@ -149,9 +154,18 @@ class BaseExecutor(ABC):
         self.baseline_rev = baseline_rev
         self.location: str = location or self.DEFAULT_LOCATION
         self.result = result
+        self.status = status
 
     @abstractmethod
-    def init_git(self, scm: "Git", branch: Optional[str] = None):
+    def init_git(
+        self,
+        repo: "Repo",
+        scm: "Git",
+        stash_rev: str,
+        entry: "ExpStashEntry",
+        infofile: Optional[str],
+        branch: Optional[str] = None,
+    ):
         """Init git repo and populate it using exp refs from the specified
         SCM instance.
         """
@@ -191,6 +205,7 @@ class BaseExecutor(ABC):
             dvc_dir=self.dvc_dir,
             name=self.name,
             wdir=self.wdir,
+            status=self.status,
             **result_dict,
         )
 
@@ -212,6 +227,7 @@ class BaseExecutor(ABC):
             root_dir=info.root_dir,
             dvc_dir=info.dvc_dir,
             baseline_rev=info.baseline_rev,
+            status=info.status,
             name=info.name,
             wdir=info.wdir,
             result=result,
@@ -222,7 +238,6 @@ class BaseExecutor(ABC):
     def from_stash_entry(
         cls: Type[_T],
         repo: "Repo",
-        stash_rev: str,
         entry: "ExpStashEntry",
         **kwargs,
     ) -> _T:
@@ -232,7 +247,6 @@ class BaseExecutor(ABC):
     def _from_stash_entry(
         cls: Type[_T],
         repo: "Repo",
-        stash_rev: str,
         entry: "ExpStashEntry",
         root_dir: str,
         **kwargs,
@@ -241,12 +255,11 @@ class BaseExecutor(ABC):
             root_dir=root_dir,
             dvc_dir=relpath(repo.dvc_dir, repo.scm.root_dir),
             baseline_rev=entry.baseline_rev,
+            status=TaskStatus.PREPARING,
             name=entry.name,
             wdir=relpath(os.getcwd(), repo.scm.root_dir),
             **kwargs,
         )
-        executor.init_git(repo.scm, branch=entry.branch)
-        executor.init_cache(repo, stash_rev)
         return executor
 
     @staticmethod
@@ -259,8 +272,12 @@ class BaseExecutor(ABC):
                 exp_data.update(to_lockfile(stage))
         return dict_sha256(exp_data)
 
-    def cleanup(self):
-        pass
+    def cleanup(self, infofile: str):
+        if infofile is not None:
+            info = ExecutorInfo.load_json(infofile)
+            if info.status < TaskStatus.FAILED:
+                info.status = TaskStatus.FINISHED
+            info.dump_json(infofile)
 
     # TODO: come up with better way to stash repro arguments
     @staticmethod
@@ -290,6 +307,7 @@ class BaseExecutor(ABC):
     def fetch_exps(
         self,
         dest_scm: "Git",
+        refs: List[str],
         force: bool = False,
         on_diverged: Callable[[str, bool], None] = None,
         **kwargs,
@@ -298,56 +316,54 @@ class BaseExecutor(ABC):
 
         Args:
             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)
                 to be called when an experiment ref has diverged.
 
         Extra kwargs will be passed into the remote git client.
         """
-        from ..utils import iter_remote_refs
 
-        refs = []
-        has_checkpoint = False
-        for ref in iter_remote_refs(
-            dest_scm,
-            self.git_url,
-            base=EXPS_NAMESPACE,
-            **kwargs,
-        ):
-            if ref == EXEC_CHECKPOINT:
-                has_checkpoint = True
-            elif not ref.startswith(EXEC_NAMESPACE) and ref != EXPS_STASH:
-                refs.append(ref)
+        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)
+
             self._raise_ref_conflict(
                 dest_scm, orig_ref, new_rev, has_checkpoint
             )
-            if on_diverged:
-                on_diverged(orig_ref, has_checkpoint)
             logger.debug("Reproduced existing experiment '%s'", orig_ref)
             return False
 
         # fetch experiments
-        dest_scm.fetch_refspecs(
-            self.git_url,
-            [f"{ref}:{ref}" for ref in refs],
-            on_diverged=on_diverged_ref,
-            force=force,
-            **kwargs,
-        )
-        # update last run checkpoint (if it exists)
-        if has_checkpoint:
+        try:
             dest_scm.fetch_refspecs(
                 self.git_url,
-                [f"{EXEC_CHECKPOINT}:{EXEC_CHECKPOINT}"],
-                force=True,
+                [f"{ref}:{ref}" for ref in refs],
+                on_diverged=on_diverged_ref,
+                force=force,
                 **kwargs,
             )
+            # update last run checkpoint (if it exists)
+            if has_checkpoint:
+                dest_scm.fetch_refspecs(
+                    self.git_url,
+                    [f"{EXEC_CHECKPOINT}:{EXEC_CHECKPOINT}"],
+                    force=True,
+                    **kwargs,
+                )
+        except SCMError:
+            pass
+
         return refs
 
     @classmethod
@@ -411,11 +427,9 @@ class BaseExecutor(ABC):
         exp_ref: Optional["ExpRefInfo"] = None
         repro_force: bool = False
 
-        if infofile is not None:
-            info.dump_json(infofile)
-
         with cls._repro_dvc(
             info,
+            infofile,
             log_errors=log_errors,
             **kwargs,
         ) as dvc:
@@ -491,9 +505,6 @@ class BaseExecutor(ABC):
             info.result_ref = ref
             info.result_force = repro_force
 
-        if infofile is not None:
-            info.dump_json(infofile)
-
         # ideally we would return stages here like a normal repro() call, but
         # stages is not currently picklable and cannot be returned across
         # multiprocessing calls
@@ -550,6 +561,7 @@ class BaseExecutor(ABC):
     def _repro_dvc(
         cls,
         info: "ExecutorInfo",
+        infofile: str = None,
         log_errors: bool = True,
         **kwargs,
     ):
@@ -557,6 +569,9 @@ class BaseExecutor(ABC):
         from dvc.stage.monitor import CheckpointKilledError
 
         dvc = Repo(os.path.join(info.root_dir, info.dvc_dir))
+        info.status = TaskStatus.RUNNING
+        if infofile is not None:
+            info.dump_json(infofile)
         if cls.QUIET:
             dvc.scm_context.quiet = cls.QUIET
         old_cwd = os.getcwd()
@@ -568,17 +583,23 @@ class BaseExecutor(ABC):
         try:
             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("")
+            info.status = TaskStatus.FAILED
             raise
         except Exception:
             if log_errors:
                 logger.exception("unexpected error")
+            info.status = TaskStatus.FAILED
             raise
         finally:
+            if infofile is not None:
+                info.dump_json(infofile)
             dvc.close()
             os.chdir(old_cwd)
 
@@ -714,3 +735,14 @@ class BaseExecutor(ABC):
         disable_other_loggers()
         if level is not None:
             dvc_logger.setLevel(level)
+
+    @contextmanager
+    def set_temp_refs(self, scm: "Git", temp_dict: Dict[str, str]):
+        try:
+            for ref, rev in temp_dict.items():
+                scm.set_ref(ref, rev)
+            yield
+        finally:
+            for ref in temp_dict:
+                if scm.get_ref(ref):
+                    scm.remove_ref(ref)

dvc/repo/experiments/executor/local.py

@@ -2,11 +2,14 @@ import logging
 import os
 from contextlib import ExitStack
 from tempfile import mkdtemp
-from typing import TYPE_CHECKING, Optional
+from typing import TYPE_CHECKING, List, Optional
 
-from funcy import cached_property
+from funcy import cached_property, retry
 from scmrepo.exceptions import SCMError as _SCMError
+from shortuuid import uuid
 
+from dvc.exceptions import DvcException
+from dvc.lock import LockError
 from dvc.scm import SCM, GitMergeError
 from dvc.utils.fs import makedirs, remove
 
@@ -18,16 +21,19 @@ from ..refs import (
     EXEC_HEAD,
     EXEC_MERGE,
     EXEC_NAMESPACE,
+    EXPS_TEMP,
+    ExpRefInfo,
 )
-from .base import EXEC_TMP_DIR, BaseExecutor
+from ..utils import EXEC_TMP_DIR, get_exp_rwlock
+from .base import BaseExecutor, ExecutorResult, TaskStatus
 
 if TYPE_CHECKING:
     from scmrepo.git import Git
 
     from dvc.repo import Repo
 
-    from ..refs import ExpRefInfo
     from ..stash import ExpStashEntry
+    from .base import ExecutorInfo
 
 logger = logging.getLogger(__name__)
 
@@ -46,10 +52,10 @@ class BaseLocalExecutor(BaseExecutor):
     def scm(self):
         return SCM(self.root_dir)
 
-    def cleanup(self):
-        super().cleanup()
+    def cleanup(self, infofile: str):
         self.scm.close()
         del self.scm
+        super().cleanup(infofile)
 
     def collect_cache(
         self, repo: "Repo", exp_ref: "ExpRefInfo", run_cache: bool = True
@@ -67,23 +73,62 @@ class TempDirExecutor(BaseLocalExecutor):
     QUIET = True
     DEFAULT_LOCATION = "tempdir"
 
-    def init_git(self, scm: "Git", branch: Optional[str] = None):
+    @retry(180, errors=LockError, timeout=1)
+    def init_git(
+        self,
+        repo: "Repo",
+        scm: "Git",
+        stash_rev: str,
+        entry: "ExpStashEntry",
+        infofile: Optional[str],
+        branch: Optional[str] = None,
+    ):
         from dulwich.repo import Repo as DulwichRepo
 
         from ..utils import push_refspec
 
         DulwichRepo.init(os.fspath(self.root_dir))
 
-        refspec = f"{EXEC_NAMESPACE}/"
-        push_refspec(scm, self.git_url, refspec, refspec)
-        if branch:
-            push_refspec(scm, self.git_url, branch, branch)
-            self.scm.set_ref(EXEC_BRANCH, branch, symbolic=True)
-        elif self.scm.get_ref(EXEC_BRANCH):
-            self.scm.remove_ref(EXEC_BRANCH)
+        self.status = TaskStatus.PREPARING
+        if infofile:
+            self.info.dump_json(infofile)
 
-        if self.scm.get_ref(EXEC_CHECKPOINT):
-            self.scm.remove_ref(EXEC_CHECKPOINT)
+        temp_head = f"{EXPS_TEMP}/head-{uuid()}"
+        temp_merge = f"{EXPS_TEMP}/merge-{uuid()}"
+        temp_baseline = f"{EXPS_TEMP}/baseline-{uuid()}"
+
+        temp_ref_dict = {
+            temp_head: entry.head_rev,
+            temp_merge: stash_rev,
+            temp_baseline: entry.baseline_rev,
+        }
+        with get_exp_rwlock(
+            repo, writes=[temp_head, temp_merge, temp_baseline]
+        ), self.set_temp_refs(scm, temp_ref_dict):
+            # Executor will be initialized with an empty git repo that
+            # we populate by pushing:
+            #   EXEC_HEAD - the base commit for this experiment
+            #   EXEC_MERGE - the unmerged changes (from our stash)
+            #       to be reproduced
+            #   EXEC_BASELINE - the baseline commit for this experiment
+            refspec = [
+                (temp_head, EXEC_HEAD),
+                (temp_merge, EXEC_MERGE),
+                (temp_baseline, EXEC_BASELINE),
+            ]
+
+            if branch:
+                refspec.append((branch, branch))
+                with get_exp_rwlock(repo, reads=[branch]):
+                    push_refspec(scm, self.git_url, refspec)
+                self.scm.set_ref(EXEC_BRANCH, branch, symbolic=True)
+            else:
+                push_refspec(scm, self.git_url, refspec)
+                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
@@ -91,10 +136,6 @@ class TempDirExecutor(BaseLocalExecutor):
         self.scm.checkout(head, detach=True)
         merge_rev = self.scm.get_ref(EXEC_MERGE)
 
-        for ref in (EXEC_HEAD, EXEC_MERGE, EXEC_BASELINE):
-            if scm.get_ref(ref):
-                scm.remove_ref(ref)
-
         try:
             self.scm.merge(merge_rev, squash=True, commit=False)
         except _SCMError as exc:
@@ -114,8 +155,8 @@ class TempDirExecutor(BaseLocalExecutor):
         """Initialize DVC cache."""
         self._config(repo.odb.repo.path)
 
-    def cleanup(self):
-        super().cleanup()
+    def cleanup(self, infofile: str):
+        super().cleanup(infofile)
         logger.debug("Removing tmpdir '%s'", self.root_dir)
         remove(self.root_dir)
 
@@ -123,7 +164,6 @@ class TempDirExecutor(BaseLocalExecutor):
     def from_stash_entry(
         cls,
         repo: "Repo",
-        stash_rev: str,
         entry: "ExpStashEntry",
         wdir: Optional[str] = None,
         **kwargs,
@@ -132,9 +172,7 @@ class TempDirExecutor(BaseLocalExecutor):
         makedirs(parent_dir, exist_ok=True)
         tmp_dir = mkdtemp(dir=parent_dir)
         try:
-            executor = cls._from_stash_entry(
-                repo, stash_rev, entry, tmp_dir, **kwargs
-            )
+            executor = cls._from_stash_entry(repo, entry, tmp_dir, **kwargs)
             logger.debug("Init temp dir executor in '%s'", tmp_dir)
             return executor
         except Exception:
@@ -152,39 +190,57 @@ class WorkspaceExecutor(BaseLocalExecutor):
     def from_stash_entry(
         cls,
         repo: "Repo",
-        stash_rev: str,
         entry: "ExpStashEntry",
         **kwargs,
     ):
         root_dir = repo.scm.root_dir
-        executor = cls._from_stash_entry(
-            repo, stash_rev, entry, root_dir, **kwargs
+        executor: "WorkspaceExecutor" = cls._from_stash_entry(
+            repo, entry, root_dir, **kwargs
         )
         logger.debug("Init workspace executor in '%s'", root_dir)
         return executor
 
-    def init_git(self, scm: "Git", branch: Optional[str] = None):
-        self._detach_stack.enter_context(
-            self.scm.detach_head(
-                self.scm.get_ref(EXEC_HEAD),
-                force=True,
-                client="dvc",
+    @retry(180, errors=LockError, timeout=1)
+    def init_git(
+        self,
+        repo: "Repo",
+        scm: "Git",
+        stash_rev: str,
+        entry: "ExpStashEntry",
+        infofile: Optional[str],
+        branch: Optional[str] = None,
+    ):
+        self.status = TaskStatus.PREPARING
+        if infofile:
+            self.info.dump_json(infofile)
+
+        with get_exp_rwlock(repo, writes=[EXEC_NAMESPACE]):
+            scm.set_ref(EXEC_HEAD, entry.head_rev)
+            scm.set_ref(EXEC_MERGE, stash_rev)
+            scm.set_ref(EXEC_BASELINE, entry.baseline_rev)
+            self._detach_stack.enter_context(
+                self.scm.detach_head(
+                    self.scm.get_ref(EXEC_HEAD),
+                    force=True,
+                    client="dvc",
+                )
             )
-        )
-        merge_rev = self.scm.get_ref(EXEC_MERGE)
-        try:
-            self.scm.merge(merge_rev, squash=True, commit=False)
-        except _SCMError as exc:
-            raise GitMergeError(str(exc), scm=self.scm)
-        if branch:
-            self.scm.set_ref(EXEC_BRANCH, branch, symbolic=True)
-        elif scm.get_ref(EXEC_BRANCH):
-            self.scm.remove_ref(EXEC_BRANCH)
+            merge_rev = self.scm.get_ref(EXEC_MERGE)
+            try:
+                self.scm.merge(merge_rev, squash=True, commit=False)
+            except _SCMError as exc:
+                raise GitMergeError(str(exc), scm=self.scm)
+            if branch:
+                self.scm.set_ref(EXEC_BRANCH, branch, symbolic=True)
+            elif scm.get_ref(EXEC_BRANCH):
+                self.scm.remove_ref(EXEC_BRANCH)
 
     def init_cache(self, repo: "Repo", rev: str, run_cache: bool = True):
         pass
 
-    def cleanup(self):
+    def cleanup(self, infofile: str):
+        super().cleanup(infofile)
+        remove(os.path.dirname(infofile))
         with self._detach_stack:
             self.scm.remove_ref(EXEC_BASELINE)
             self.scm.remove_ref(EXEC_MERGE)
@@ -193,4 +249,57 @@ class WorkspaceExecutor(BaseLocalExecutor):
             checkpoint = self.scm.get_ref(EXEC_CHECKPOINT)
             if checkpoint and checkpoint != self._orig_checkpoint:
                 self.scm.set_ref(EXEC_APPLY, checkpoint)
-        super().cleanup()
+
+    @classmethod
+    def save(
+        cls,
+        info: "ExecutorInfo",
+        force: bool = False,
+        include_untracked: Optional[List[str]] = None,
+    ) -> ExecutorResult:
+        from dvc.repo import Repo
+
+        exp_hash: Optional[str] = None
+        exp_ref: Optional[ExpRefInfo] = None
+
+        dvc = Repo(os.path.join(info.root_dir, info.dvc_dir))
+        old_cwd = os.getcwd()
+        if info.wdir:
+            os.chdir(os.path.join(dvc.scm.root_dir, info.wdir))
+        else:
+            os.chdir(dvc.root_dir)
+
+        try:
+            stages = dvc.commit([], force=force)
+            exp_hash = cls.hash_exp(stages)
+            if include_untracked:
+                dvc.scm.add(include_untracked)
+            cls.commit(
+                dvc.scm,
+                exp_hash,
+                exp_name=info.name,
+                force=force,
+            )
+            ref: Optional[str] = dvc.scm.get_ref(EXEC_BRANCH, follow=False)
+            exp_ref = ExpRefInfo.from_ref(ref) if ref else None
+            untracked = dvc.scm.untracked_files()
+            if untracked:
+                logger.warning(
+                    "The following untracked files were present in "
+                    "the workspace before saving but "
+                    "will not be included in the experiment commit:\n"
+                    "\t%s",
+                    ", ".join(untracked),
+                )
+            info.result_hash = exp_hash
+            info.result_ref = ref
+            info.result_force = False
+            info.status = TaskStatus.SUCCESS
+        except DvcException:
+            info.status = TaskStatus.FAILED
+            raise
+        finally:
+            dvc.close()
+            os.chdir(old_cwd)
+
+        return ExecutorResult(ref, exp_ref, info.result_force)

dvc/repo/experiments/executor/manager/base.py

@@ -1,269 +0,0 @@
-import logging
-import os
-from abc import ABC
-from collections import defaultdict, deque
-from collections.abc import Mapping
-from typing import TYPE_CHECKING, Deque, Dict, Generator, Optional, Tuple, Type
-
-from dvc.proc.manager import ProcessManager
-
-from ...exceptions import CheckpointExistsError, ExperimentExistsError
-from ...refs import EXEC_BASELINE, EXEC_HEAD, EXEC_MERGE, ExpRefInfo
-from ...stash import ExpStashEntry
-from ..base import EXEC_PID_DIR, BaseExecutor
-from ..local import TempDirExecutor, WorkspaceExecutor
-
-if TYPE_CHECKING:
-    from scmrepo.git import Git
-
-    from dvc.repo import Repo
-
-logger = logging.getLogger(__name__)
-
-
-class BaseExecutorManager(ABC, Mapping):  # noqa: B024
-    """Manages executors for a collection of experiments to be run."""
-
-    EXECUTOR_CLS: Type = BaseExecutor
-
-    def __init__(
-        self,
-        scm: "Git",
-        wdir: str,
-        **kwargs,
-    ):
-        from dvc.utils.fs import makedirs
-
-        self.scm = scm
-        makedirs(wdir, exist_ok=True)
-        self.wdir = wdir
-        self.proc = ProcessManager(self.pid_dir)
-        self._attached: Dict[str, "BaseExecutor"] = {}
-        self._detached: Dict[str, "BaseExecutor"] = dict(self._load_infos())
-        self._queue: Deque[Tuple[str, "BaseExecutor"]] = deque()
-
-    def __getitem__(self, key: str) -> "BaseExecutor":
-        try:
-            return self._attached[key]
-        except KeyError:
-            pass
-        return self._detached[key]
-
-    def __iter__(self):
-        yield from self._attached
-        yield from self._detached
-
-    def __len__(self):
-        return len(self._attached) + len(self._detached)
-
-    @property
-    def pid_dir(self) -> str:
-        return os.path.join(self.wdir, EXEC_PID_DIR)
-
-    def enqueue(self, rev: str, executor: "BaseExecutor"):
-        assert rev not in self
-        self._queue.append((rev, executor))
-
-    def _load_infos(self) -> Generator[Tuple[str, "BaseExecutor"], None, None]:
-        import json
-        from urllib.parse import urlparse
-
-        from ..base import ExecutorInfo
-        from ..ssh import SSHExecutor
-
-        def make_executor(info: "ExecutorInfo"):
-            if info.git_url:
-                scheme = urlparse(info.git_url).scheme
-                if scheme == "file":
-                    cls: Type = TempDirExecutor
-                elif scheme == "ssh":
-                    cls = SSHExecutor
-                else:
-                    raise NotImplementedError
-            else:
-                cls = WorkspaceExecutor
-            return cls.from_info(info)
-
-        for name in self.proc:
-            infofile = self.get_infofile_path(name)
-            try:
-                with open(infofile, encoding="utf-8") as fobj:
-                    info = ExecutorInfo.from_dict(json.load(fobj))
-                yield name, make_executor(info)
-            except OSError:
-                continue
-
-    def get_infofile_path(self, name: str) -> str:
-        return os.path.join(
-            self.pid_dir,
-            name,
-            f"{name}{BaseExecutor.INFOFILE_EXT}",
-        )
-
-    @classmethod
-    def from_stash_entries(
-        cls,
-        scm: "Git",
-        wdir: str,
-        repo: "Repo",
-        to_run: Dict[str, ExpStashEntry],
-        **kwargs,
-    ):
-        manager = cls(scm, wdir)
-        manager._enqueue_stash_entries(scm, repo, to_run, **kwargs)
-        return manager
-
-    def _enqueue_stash_entries(
-        self,
-        scm: "Git",
-        repo: "Repo",
-        to_run: Dict[str, ExpStashEntry],
-        **kwargs,
-    ):
-        try:
-            for stash_rev, entry in to_run.items():
-                scm.set_ref(EXEC_HEAD, entry.head_rev)
-                scm.set_ref(EXEC_MERGE, stash_rev)
-                scm.set_ref(EXEC_BASELINE, entry.baseline_rev)
-
-                # Executor will be initialized with an empty git repo that
-                # we populate by pushing:
-                #   EXEC_HEAD - the base commit for this experiment
-                #   EXEC_MERGE - the unmerged changes (from our stash)
-                #       to be reproduced
-                #   EXEC_BASELINE - the baseline commit for this experiment
-                executor = self.EXECUTOR_CLS.from_stash_entry(
-                    repo,
-                    stash_rev,
-                    entry,
-                    **kwargs,
-                )
-                self.enqueue(stash_rev, executor)
-        finally:
-            for ref in (EXEC_HEAD, EXEC_MERGE, EXEC_BASELINE):
-                scm.remove_ref(ref)
-
-    def exec_queue(
-        self, repo: "Repo", jobs: Optional[int] = 1, detach: bool = False
-    ):
-        """Run dvc repro for queued executors in parallel."""
-        if detach:
-            raise NotImplementedError
-            # TODO use ProcessManager.spawn() to support detached runs
-        return self._exec_attached(repo, jobs=jobs)
-
-    def _exec_attached(self, repo: "Repo", jobs: Optional[int] = 1):
-        import signal
-        from concurrent.futures import (
-            CancelledError,
-            ProcessPoolExecutor,
-            wait,
-        )
-        from multiprocessing import Manager
-
-        from dvc.stage.monitor import CheckpointKilledError
-
-        result: Dict[str, Dict[str, str]] = defaultdict(dict)
-
-        manager = Manager()
-        pid_q = manager.Queue()
-
-        with ProcessPoolExecutor(max_workers=jobs) as workers:
-            futures = {}
-            while self._queue:
-                rev, executor = self._queue.popleft()
-                infofile = self.get_infofile_path(rev)
-                future = workers.submit(
-                    executor.reproduce,
-                    info=executor.info,
-                    rev=rev,
-                    queue=pid_q,
-                    infofile=infofile,
-                    log_level=logger.getEffectiveLevel(),
-                )
-                futures[future] = (rev, executor)
-                self._attached[rev] = executor
-
-            try:
-                wait(futures)
-            except KeyboardInterrupt:
-                # forward SIGINT to any running executor processes and
-                # cancel any remaining futures
-                workers.shutdown(wait=False)
-                pids = {}
-                for future, (rev, _) in futures.items():
-                    if future.running():
-                        # if future has already been started by the scheduler
-                        # we still have to wait until it tells us its PID
-                        while rev not in pids:
-                            rev, pid = pid_q.get()
-                            pids[rev] = pid
-                        os.kill(pids[rev], signal.SIGINT)
-                    elif not future.done():
-                        future.cancel()
-
-            for future, (rev, executor) in futures.items():
-                rev, executor = futures[future]
-
-                try:
-                    exc = future.exception()
-                    if exc is None:
-                        exec_result = future.result()
-                        result[rev].update(
-                            self._collect_executor(repo, executor, exec_result)
-                        )
-                    elif not isinstance(exc, CheckpointKilledError):
-                        logger.error(
-                            "Failed to reproduce experiment '%s'", rev[:7]
-                        )
-                except CancelledError:
-                    logger.error(
-                        "Cancelled before attempting to reproduce experiment "
-                        "'%s'",
-                        rev[:7],
-                    )
-                finally:
-                    self.cleanup_executor(rev, executor)
-
-        return result
-
-    def _collect_executor(self, repo, executor, exec_result) -> Dict[str, str]:
-        # NOTE: GitPython Repo instances cannot be re-used
-        # after process has received SIGINT or SIGTERM, so we
-        # need this hack to re-instantiate git instances after
-        # checkpoint runs. See:
-        # https://github.com/gitpython-developers/GitPython/issues/427
-        # del self.repo.scm
-
-        results = {}
-
-        def on_diverged(ref: str, checkpoint: bool):
-            ref_info = ExpRefInfo.from_ref(ref)
-            if checkpoint:
-                raise CheckpointExistsError(ref_info.name)
-            raise ExperimentExistsError(ref_info.name)
-
-        for ref in executor.fetch_exps(
-            self.scm,
-            force=exec_result.force,
-            on_diverged=on_diverged,
-        ):
-            exp_rev = self.scm.get_ref(ref)
-            if exp_rev:
-                logger.debug("Collected experiment '%s'.", exp_rev[:7])
-                results[exp_rev] = exec_result.exp_hash
-
-        if exec_result.ref_info is not None:
-            executor.collect_cache(repo, exec_result.ref_info)
-
-        return results
-
-    def cleanup_executor(self, rev: str, executor: "BaseExecutor"):
-        from dvc.utils.fs import remove
-
-        executor.cleanup()
-        try:
-            self.proc.remove(rev)
-        except KeyError:
-            pass
-        remove(os.path.join(self.pid_dir, rev))

dvc/repo/experiments/executor/manager/local.py

@@ -1,107 +0,0 @@
-import logging
-from collections import defaultdict
-from typing import TYPE_CHECKING, Dict, Optional
-
-from ...refs import EXEC_BASELINE, EXEC_BRANCH, EXEC_HEAD, EXEC_MERGE
-from ...stash import ExpStashEntry
-from ..local import TempDirExecutor, WorkspaceExecutor
-from .base import BaseExecutorManager
-
-if TYPE_CHECKING:
-    from scmrepo.git import Git
-
-    from dvc.repo import Repo
-
-logger = logging.getLogger(__name__)
-
-
-class TempDirExecutorManager(BaseExecutorManager):
-    EXECUTOR_CLS = TempDirExecutor
-
-
-class WorkspaceExecutorManager(BaseExecutorManager):
-    EXECUTOR_CLS = WorkspaceExecutor
-
-    @classmethod
-    def from_stash_entries(
-        cls,
-        scm: "Git",
-        wdir: str,
-        repo: "Repo",
-        to_run: Dict[str, ExpStashEntry],
-        **kwargs,
-    ):
-        manager = cls(scm, wdir)
-        try:
-            assert len(to_run) == 1
-            for stash_rev, entry in to_run.items():
-                scm.set_ref(EXEC_HEAD, entry.head_rev)
-                scm.set_ref(EXEC_MERGE, stash_rev)
-                scm.set_ref(EXEC_BASELINE, entry.baseline_rev)
-
-                executor = cls.EXECUTOR_CLS.from_stash_entry(
-                    repo,
-                    stash_rev,
-                    entry,
-                    **kwargs,
-                )
-                manager.enqueue(stash_rev, executor)
-        finally:
-            for ref in (EXEC_MERGE,):
-                scm.remove_ref(ref)
-        return manager
-
-    def _collect_executor(self, repo, executor, exec_result) -> Dict[str, str]:
-        results = {}
-        exp_rev = self.scm.get_ref(EXEC_BRANCH)
-        if exp_rev:
-            logger.debug("Collected experiment '%s'.", exp_rev[:7])
-            results[exp_rev] = exec_result.exp_hash
-        return results
-
-    def exec_queue(
-        self, repo: "Repo", jobs: Optional[int] = 1, detach: bool = False
-    ):
-        """Run a single WorkspaceExecutor.
-
-        Workspace execution is done within the main DVC process
-        (rather than in multiprocessing context)
-        """
-        from dvc.exceptions import DvcException
-        from dvc.stage.monitor import CheckpointKilledError
-
-        assert len(self._queue) == 1
-        assert not detach
-        result: Dict[str, Dict[str, str]] = defaultdict(dict)
-        rev, executor = self._queue.popleft()
-
-        exec_name = "workspace"
-        infofile = self.get_infofile_path(exec_name)
-        try:
-            exec_result = executor.reproduce(
-                info=executor.info,
-                rev=rev,
-                infofile=infofile,
-                log_level=logger.getEffectiveLevel(),
-                log_errors=not isinstance(executor, WorkspaceExecutor),
-            )
-            if not exec_result.exp_hash:
-                raise DvcException(
-                    f"Failed to reproduce experiment '{rev[:7]}'"
-                )
-            if exec_result.ref_info:
-                result[rev].update(
-                    self._collect_executor(repo, executor, exec_result)
-                )
-        except CheckpointKilledError:
-            # Checkpoint errors have already been logged
-            return {}
-        except DvcException:
-            raise
-        except Exception as exc:
-            raise DvcException(
-                f"Failed to reproduce experiment '{rev[:7]}'"
-            ) from exc
-        finally:
-            self.cleanup_executor(exec_name, executor)
-        return result

dvc/repo/experiments/executor/manager/ssh.py

@@ -1,109 +0,0 @@
-import logging
-import posixpath
-from collections import defaultdict
-from typing import TYPE_CHECKING, Callable, Dict, Generator, Optional, Tuple
-
-from ...stash import ExpStashEntry
-from ..base import BaseExecutor
-from ..ssh import SSHExecutor, _sshfs
-from .base import BaseExecutorManager
-
-if TYPE_CHECKING:
-    from scmrepo.git import Git
-
-    from dvc.repo import Repo
-
-logger = logging.getLogger(__name__)
-
-
-class SSHExecutorManager(BaseExecutorManager):
-    EXECUTOR_CLS = SSHExecutor
-
-    def __init__(
-        self,
-        scm: "Git",
-        wdir: str,
-        host: Optional[str] = None,
-        port: Optional[int] = None,
-        username: Optional[str] = None,
-        fs_factory: Optional[Callable] = None,
-        **kwargs,
-    ):
-        assert host
-        super().__init__(scm, wdir, **kwargs)
-        self.host = host
-        self.port = port
-        self.username = username
-        self._fs_factory = fs_factory
-
-    def _load_infos(self) -> Generator[Tuple[str, "BaseExecutor"], None, None]:
-        # TODO: load existing infos using sshfs
-        yield from []
-
-    @classmethod
-    def from_stash_entries(
-        cls,
-        scm: "Git",
-        wdir: str,
-        repo: "Repo",
-        to_run: Dict[str, ExpStashEntry],
-        **kwargs,
-    ):
-        machine_name: Optional[str] = kwargs.get("machine_name", None)
-        manager = cls(
-            scm, wdir, **repo.machine.get_executor_kwargs(machine_name)
-        )
-        manager._enqueue_stash_entries(scm, repo, to_run, **kwargs)
-        return manager
-
-    def sshfs(self):
-        return _sshfs(self._fs_factory, host=self.host, port=self.port)
-
-    def get_infofile_path(self, name: str) -> str:
-        return f"{name}{BaseExecutor.INFOFILE_EXT}"
-
-    def _exec_attached(self, repo: "Repo", jobs: Optional[int] = 1):
-        from dvc.exceptions import DvcException
-        from dvc.stage.monitor import CheckpointKilledError
-
-        assert len(self._queue) == 1
-        result: Dict[str, Dict[str, str]] = defaultdict(dict)
-        rev, executor = self._queue.popleft()
-        info = executor.info
-        infofile = posixpath.join(
-            info.root_dir,
-            info.dvc_dir,
-            "tmp",
-            self.get_infofile_path(rev),
-        )
-        try:
-            exec_result = executor.reproduce(
-                info=executor.info,
-                rev=rev,
-                infofile=infofile,
-                log_level=logger.getEffectiveLevel(),
-                fs_factory=self._fs_factory,
-            )
-            if not exec_result.exp_hash:
-                raise DvcException(
-                    f"Failed to reproduce experiment '{rev[:7]}'"
-                )
-            if exec_result.ref_info:
-                result[rev].update(
-                    self._collect_executor(repo, executor, exec_result)
-                )
-        except CheckpointKilledError:
-            # Checkpoint errors have already been logged
-            return {}
-        except DvcException:
-            raise
-        except Exception as exc:
-            raise DvcException(
-                f"Failed to reproduce experiment '{rev[:7]}'"
-            ) from exc
-        finally:
-            self.cleanup_executor(rev, executor)
-        return result
-
-    def cleanup_executor(self, rev: str, executor: "BaseExecutor"):
-        executor.cleanup()

dvc/repo/experiments/executor/ssh.py

@@ -9,13 +9,14 @@ from dvc_ssh import SSHFileSystem
 from funcy import first
 
 from ..refs import (
+    EXEC_BASELINE,
     EXEC_BRANCH,
     EXEC_CHECKPOINT,
     EXEC_HEAD,
     EXEC_MERGE,
     EXEC_NAMESPACE,
 )
-from .base import BaseExecutor, ExecutorInfo, ExecutorResult
+from .base import BaseExecutor, ExecutorInfo, ExecutorResult, TaskStatus
 
 if TYPE_CHECKING:
     from queue import Queue
@@ -23,8 +24,8 @@ if TYPE_CHECKING:
     from scmrepo.git import Git
 
     from dvc.repo import Repo
-
-    from ..base import ExpRefInfo, ExpStashEntry
+    from dvc.repo.experiments.refs import ExpRefInfo
+    from dvc.repo.experiments.stash import ExpStashEntry
 
 logger = logging.getLogger(__name__)
 
@@ -75,14 +76,12 @@ class SSHExecutor(BaseExecutor):
     def from_stash_entry(
         cls,
         repo: "Repo",
-        stash_rev: str,
         entry: "ExpStashEntry",
         **kwargs,
     ):
         machine_name: Optional[str] = kwargs.pop("machine_name", None)
         executor = cls._from_stash_entry(
             repo,
-            stash_rev,
             entry,
             cls.gen_dirname(entry.name),
             location=machine_name,
@@ -119,9 +118,21 @@ class SSHExecutor(BaseExecutor):
         }
         return kwargs
 
-    def init_git(self, scm: "Git", branch: Optional[str] = None):
+    def init_git(
+        self,
+        repo: "Repo",
+        scm: "Git",
+        stash_rev: str,
+        entry: "ExpStashEntry",
+        infofile: Optional[str],
+        branch: Optional[str] = None,
+    ):
         from ..utils import push_refspec
 
+        self.status = TaskStatus.PREPARING
+        if infofile:
+            self.info.dump_json(infofile)
+
         with self.sshfs() as fs:
             fs.makedirs(self.root_dir)
             self._ssh_cmd(fs, "git init .")
@@ -137,10 +148,19 @@ class SSHExecutor(BaseExecutor):
             # TODO: support multiple client key retries in git backends
             # (see https://github.com/iterative/dvc/issues/6508)
             kwargs = self._git_client_args(fs)
-            refspec = f"{EXEC_NAMESPACE}/"
-            push_refspec(scm, self.git_url, refspec, refspec, **kwargs)
+
+            ref_dict = {
+                EXEC_HEAD: entry.head_rev,
+                EXEC_MERGE: stash_rev,
+                EXEC_BASELINE: entry.baseline_rev,
+            }
+            with self.set_temp_refs(scm, ref_dict):
+                exec_namespace = f"{EXEC_NAMESPACE}/"
+                refspec = [(exec_namespace, exec_namespace)]
+                push_refspec(scm, self.git_url, refspec, **kwargs)
+
             if branch:
-                push_refspec(scm, self.git_url, branch, branch, **kwargs)
+                push_refspec(scm, self.git_url, [(branch, branch)], **kwargs)
                 self._ssh_cmd(fs, f"git symbolic-ref {EXEC_BRANCH} {branch}")
             else:
                 self._ssh_cmd(

dvc/repo/experiments/init.py

@@ -248,11 +248,6 @@ def init(
         except MissingParamsFile:
             pass
 
-    models = context.get("models")
-    live_path = context.pop("live", None)
-    live_metrics = f"{live_path}.json" if live_path else None
-    live_plots = os.path.join(live_path, "scalars") if live_path else None
-
     if type == "checkpoint":
         outs_key = "checkpoints"
         metrics_key = "metrics_persist_no_cache"
@@ -262,6 +257,13 @@ def init(
         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"],
@@ -269,9 +271,9 @@ def init(
         params=[{params: None}] if params else None,
         force=force,
         **{
-            outs_key: compact([models]),
-            metrics_key: compact([context.get("metrics"), live_metrics]),
-            plots_key: compact([context.get("plots"), live_plots]),
+            outs_key: compact(models),
+            metrics_key: compact(metrics),
+            plots_key: compact(plots),
         },
     )
 

dvc/repo/experiments/ls.py

@@ -6,7 +6,7 @@ from dvc.repo.scm_context import scm_context
 from dvc.scm import iter_revs
 from dvc.types import Optional
 
-from .utils import exp_refs, exp_refs_by_baseline
+from .utils import exp_refs_by_baseline
 
 logger = logging.getLogger(__name__)
 
@@ -20,19 +20,22 @@ def ls(
     num: int = 1,
     git_remote: Optional[str] = None,
 ):
-    results = defaultdict(list)
-    if all_commits:
-        gen = exp_refs(repo.scm, git_remote)
-        for info in gen:
-            results[info.baseline_sha].append(info.name)
-        return results
-
-    rev = rev or "HEAD"
-
-    revs = iter_revs(repo.scm, [rev], num)
-    rev_set = set(revs.keys())
+    rev_set = None
+    if not all_commits:
+        revs = iter_revs(repo.scm, [rev or "HEAD"], num)
+        rev_set = set(revs.keys())
     ref_info_dict = exp_refs_by_baseline(repo.scm, rev_set, git_remote)
-    for rev, ref_info_list in ref_info_dict.items():
-        results[rev] = [ref_info.name for ref_info in ref_info_list]
+
+    tags = repo.scm.describe(ref_info_dict.keys())
+    remained = {baseline for baseline, tag in tags.items() if tag is None}
+    base = "refs/heads"
+    ref_heads = repo.scm.describe(remained, base=base)
+
+    results = defaultdict(list)
+    for baseline in ref_info_dict:
+        name = baseline[:7]
+        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]]
 
     return results

dvc/repo/experiments/queue/base.py

@@ -1,6 +1,5 @@
 import logging
 import os
-import sys
 from abc import ABC, abstractmethod
 from dataclasses import asdict, dataclass
 from typing import (
@@ -18,24 +17,21 @@ from typing import (
     Union,
 )
 
-from funcy import cached_property
+from funcy import cached_property, retry
 
 from dvc.dependency import ParamsDependency
-from dvc.env import DVCLIVE_RESUME
+from dvc.env import DVC_EXP_BASELINE_REV, DVC_EXP_NAME, DVCLIVE_RESUME
 from dvc.exceptions import DvcException
+from dvc.lock import LockError
 from dvc.ui import ui
 
 from ..exceptions import CheckpointExistsError, ExperimentExistsError
-from ..executor.base import (
-    EXEC_PID_DIR,
-    EXEC_TMP_DIR,
-    BaseExecutor,
-    ExecutorResult,
-)
+from ..executor.base import BaseExecutor, ExecutorResult
 from ..executor.local import WorkspaceExecutor
-from ..refs import EXEC_BASELINE, EXEC_HEAD, EXEC_MERGE, ExpRefInfo
+from ..refs import ExpRefInfo
 from ..stash import ExpStash, ExpStashEntry
-from ..utils import exp_refs_by_rev, scm_locked
+from ..utils import EXEC_PID_DIR, EXEC_TMP_DIR, exp_refs_by_rev, get_exp_rwlock
+from .utils import get_remote_executor_refs
 
 if TYPE_CHECKING:
     from scmrepo.git import Git
@@ -268,6 +264,7 @@ class BaseStashQueue(ABC):
                 finish any active experiments before shutting down.
         """
 
+    @abstractmethod
     def logs(
         self,
         rev: str,
@@ -399,7 +396,13 @@ class BaseStashQueue(ABC):
                             )
 
                     # save additional repro command line arguments
-                    run_env = {DVCLIVE_RESUME: "1"} if resume_rev else {}
+                    run_env = {
+                        DVC_EXP_BASELINE_REV: baseline_rev,
+                    }
+                    if name:
+                        run_env[DVC_EXP_NAME] = name
+                    if resume_rev:
+                        run_env[DVCLIVE_RESUME] = "1"
                     self._pack_args(*args, run_env=run_env, **kwargs)
 
                     # save experiment as a stash commit
@@ -524,16 +527,9 @@ class BaseStashQueue(ABC):
         .. _Hydra Override:
             https://hydra.cc/docs/advanced/override_grammar/basic/
         """
-        logger.debug("Using experiment params '%s'", params)
+        from dvc.utils.hydra import apply_overrides, compose_and_dump
 
-        try:
-            from dvc.utils.hydra import apply_overrides, compose_and_dump
-        except ValueError:
-            if sys.version_info >= (3, 11):
-                raise DvcException(
-                    "--set-param is not supported in Python >= 3.11"
-                )
-            raise
+        logger.debug("Using experiment params '%s'", params)
 
         hydra_config = self.repo.config.get("hydra", {})
         hydra_enabled = hydra_config.get("enabled", False)
@@ -560,36 +556,50 @@ class BaseStashQueue(ABC):
         self.scm.add(list(params.keys()))
 
     @staticmethod
-    @scm_locked
-    def setup_executor(
+    @retry(180, errors=LockError, timeout=1)
+    def get_stash_entry(
+        exp: "Experiments",
+        queue_entry: QueueEntry,
+    ) -> "ExpStashEntry":
+        stash = ExpStash(exp.scm, queue_entry.stash_ref)
+        stash_rev = queue_entry.stash_rev
+        with get_exp_rwlock(exp.repo, writes=[queue_entry.stash_ref]):
+            stash_entry = stash.stash_revs.get(
+                stash_rev,
+                ExpStashEntry(None, stash_rev, stash_rev, None, None),
+            )
+            if stash_entry.stash_index is not None:
+                stash.drop(stash_entry.stash_index)
+        return stash_entry
+
+    @classmethod
+    def init_executor(
+        cls,
         exp: "Experiments",
         queue_entry: QueueEntry,
         executor_cls: Type[BaseExecutor] = WorkspaceExecutor,
         **kwargs,
     ) -> BaseExecutor:
-        scm = exp.scm
-        stash = ExpStash(scm, queue_entry.stash_ref)
+        stash_entry = cls.get_stash_entry(exp, queue_entry)
+
+        executor = executor_cls.from_stash_entry(
+            exp.repo, stash_entry, **kwargs
+        )
+
         stash_rev = queue_entry.stash_rev
-        stash_entry = stash.stash_revs.get(
+        infofile = exp.celery_queue.get_infofile_path(stash_rev)
+        executor.init_git(
+            exp.repo,
+            exp.repo.scm,
             stash_rev,
-            ExpStashEntry(None, stash_rev, stash_rev, None, None),
+            stash_entry,
+            infofile,
+            branch=stash_entry.branch,
         )
-        if stash_entry.stash_index is not None:
-            stash.drop(stash_entry.stash_index)
 
-        scm.set_ref(EXEC_HEAD, stash_entry.head_rev)
-        scm.set_ref(EXEC_MERGE, stash_rev)
-        scm.set_ref(EXEC_BASELINE, stash_entry.baseline_rev)
+        executor.init_cache(exp.repo, stash_rev)
 
-        # Executor will be initialized with an empty git repo that
-        # we populate by pushing:
-        #   EXEC_HEAD - the base commit for this experiment
-        #   EXEC_MERGE - the unmerged changes (from our stash)
-        #       to be reproduced
-        #   EXEC_BASELINE - the baseline commit for this experiment
-        return executor_cls.from_stash_entry(
-            exp.repo, stash_rev, stash_entry, **kwargs
-        )
+        return executor
 
     def get_infofile_path(self, name: str) -> str:
         return os.path.join(
@@ -599,8 +609,8 @@ class BaseStashQueue(ABC):
         )
 
     @staticmethod
-    @scm_locked
-    def collect_executor(
+    @retry(180, errors=LockError, timeout=1)
+    def collect_git(
         exp: "Experiments",
         executor: BaseExecutor,
         exec_result: ExecutorResult,
@@ -613,16 +623,31 @@ class BaseStashQueue(ABC):
                 raise CheckpointExistsError(ref_info.name)
             raise ExperimentExistsError(ref_info.name)
 
-        for ref in executor.fetch_exps(
-            exp.scm,
-            force=exec_result.force,
-            on_diverged=on_diverged,
-        ):
-            exp_rev = exp.scm.get_ref(ref)
-            if exp_rev:
-                assert exec_result.exp_hash
-                logger.debug("Collected experiment '%s'.", exp_rev[:7])
-                results[exp_rev] = exec_result.exp_hash
+        refs = get_remote_executor_refs(exp.scm, executor.git_url)
+
+        with get_exp_rwlock(exp.repo, writes=refs):
+            for ref in executor.fetch_exps(
+                exp.scm,
+                refs,
+                force=exec_result.force,
+                on_diverged=on_diverged,
+            ):
+                exp_rev = exp.scm.get_ref(ref)
+                if exp_rev:
+                    assert exec_result.exp_hash
+                    logger.debug("Collected experiment '%s'.", exp_rev[:7])
+                    results[exp_rev] = exec_result.exp_hash
+
+        return results
+
+    @classmethod
+    def collect_executor(
+        cls,
+        exp: "Experiments",
+        executor: BaseExecutor,
+        exec_result: ExecutorResult,
+    ) -> Dict[str, str]:
+        results = cls.collect_git(exp, executor, exec_result)
 
         if exec_result.ref_info is not None:
             executor.collect_cache(exp.repo, exec_result.ref_info)
@@ -690,3 +715,11 @@ class BaseStashQueue(ABC):
                 entry.stash_rev,
                 message=f"commit: {msg}",
             )
+
+    @abstractmethod
+    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.
+        """

dvc/repo/experiments/queue/celery.py

@@ -15,7 +15,7 @@ from typing import (
 )
 
 from celery.result import AsyncResult
-from funcy import cached_property
+from funcy import cached_property, first
 from kombu.message import Message
 
 from dvc.daemon import daemonize
@@ -23,9 +23,13 @@ from dvc.exceptions import DvcException
 from dvc.ui import ui
 
 from ..exceptions import UnresolvedQueueExpNamesError
-from ..executor.base import EXEC_TMP_DIR, ExecutorInfo, ExecutorResult
+from ..executor.base import ExecutorInfo, ExecutorResult
+from ..refs import CELERY_STASH
+from ..utils import EXEC_TMP_DIR, get_exp_rwlock
 from .base import BaseStashQueue, QueueDoneResult, QueueEntry, QueueGetResult
+from .exceptions import CannotKillTasksError
 from .tasks import run_exp
+from .utils import fetch_running_exp_from_temp_dir
 
 if TYPE_CHECKING:
     from dvc_task.app import FSApp
@@ -162,7 +166,8 @@ class LocalCeleryQueue(BaseStashQueue):
 
     def put(self, *args, **kwargs) -> QueueEntry:
         """Stash an experiment and add it to the queue."""
-        entry = self._stash_exp(*args, **kwargs)
+        with get_exp_rwlock(self.repo, writes=["workspace", CELERY_STASH]):
+            entry = self._stash_exp(*args, **kwargs)
         self.celery.signature(run_exp.s(entry.asdict())).delay()
         return entry
 
@@ -181,6 +186,7 @@ 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"])
             yield _MessageEntry(msg, QueueEntry.from_dict(entry_dict))
 
     def _iter_processed(self) -> Generator[_MessageEntry, None, None]:
@@ -197,6 +203,7 @@ 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)
                 yield _TaskEntry(result, entry)
 
     def _iter_done_tasks(self) -> Generator[_TaskEntry, None, None]:
@@ -205,6 +212,7 @@ 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)
                 yield _TaskEntry(result, entry)
 
     def iter_active(self) -> Generator[QueueEntry, None, None]:
@@ -237,67 +245,115 @@ class LocalCeleryQueue(BaseStashQueue):
     def reproduce(self) -> Mapping[str, Mapping[str, str]]:
         raise NotImplementedError
 
-    def get_result(
+    def _load_info(self, rev: str) -> ExecutorInfo:
+        infofile = self.get_infofile_path(rev)
+        return ExecutorInfo.load_json(infofile)
+
+    def _get_done_result(
         self, entry: QueueEntry, timeout: Optional[float] = None
-    ) -> Optional[ExecutorResult]:
+    ) -> Optional["ExecutorResult"]:
         from celery.exceptions import TimeoutError as _CeleryTimeout
 
-        def _load_info(rev: str) -> ExecutorInfo:
-            infofile = self.get_infofile_path(rev)
-            return ExecutorInfo.load_json(infofile)
-
-        def _load_collected(rev: str) -> Optional[ExecutorResult]:
-            executor_info = _load_info(rev)
-            if executor_info.collected:
+        for msg, processed_entry in self._iter_processed():
+            if entry.stash_rev == processed_entry.stash_rev:
+                task_id = msg.headers["id"]
+                result: AsyncResult = AsyncResult(task_id)
+                if not result.ready():
+                    logger.debug(
+                        "Waiting for exp task '%s' to complete", result.id
+                    )
+                    try:
+                        result.get(timeout=timeout)
+                    except _CeleryTimeout as exc:
+                        raise DvcException(
+                            "Timed out waiting for exp to finish."
+                        ) from exc
+                executor_info = self._load_info(entry.stash_rev)
                 return executor_info.result
-            raise FileNotFoundError
+        raise FileNotFoundError
+
+    def get_result(
+        self, entry: QueueEntry, timeout: Optional[float] = None
+    ) -> Optional["ExecutorResult"]:
 
         try:
-            return _load_collected(entry.stash_rev)
+            return self._get_done_result(entry, timeout)
         except FileNotFoundError:
-            # Infofile will not be created until execution begins
             pass
 
         for queue_entry in self.iter_queued():
             if entry.stash_rev == queue_entry.stash_rev:
                 raise DvcException("Experiment has not been started.")
-        for result, active_entry in self._iter_active_tasks():
-            if entry.stash_rev == active_entry.stash_rev:
-                logger.debug(
-                    "Waiting for exp task '%s' to complete", result.id
-                )
-                try:
-                    result.get(timeout=timeout)
-                except _CeleryTimeout as exc:
-                    raise DvcException(
-                        "Timed out waiting for exp to finish."
-                    ) from exc
-                executor_info = _load_info(entry.stash_rev)
-                return executor_info.result
 
         # NOTE: It's possible for an exp to complete while iterating through
         # other queued and active tasks, in which case the exp will get moved
         # out of the active task list, and needs to be loaded here.
-        return _load_collected(entry.stash_rev)
+        return self._get_done_result(entry, timeout)
+
+    def _get_running_task_ids(self) -> Set[str]:
+        running_task_ids: Set[str] = set()
+        active_workers = self.worker_status()
+        for _, tasks in active_workers.items():
+            task = first(tasks)
+            if task:
+                running_task_ids.add(task["id"])
+        return running_task_ids
+
+    def _try_to_kill_tasks(
+        self, to_kill: Dict[QueueEntry, str]
+    ) -> Dict[QueueEntry, str]:
+        fail_to_kill_entries: Dict[QueueEntry, str] = {}
+        for queue_entry, rev in to_kill.items():
+            try:
+                self.proc.kill(queue_entry.stash_rev)
+                logger.debug(f"Task {rev} had been killed.")
+            except ProcessLookupError:
+                fail_to_kill_entries[queue_entry] = rev
+        return fail_to_kill_entries
+
+    def _mark_inactive_tasks_failure(self, remained_entries):
+        remained_revs: List[str] = []
+        running_ids = self._get_running_task_ids()
+        logger.debug(f"Current running tasks ids: {running_ids}.")
+        for msg, entry in self._iter_processed():
+            if entry not in remained_entries:
+                continue
+            task_id = msg.headers["id"]
+            if task_id in running_ids:
+                remained_revs.append(remained_entries[entry])
+            else:
+                result: AsyncResult = AsyncResult(task_id)
+                if not result.ready():
+                    logger.debug(
+                        f"Task id {task_id} rev {remained_entries[entry]} "
+                        "marked as failure."
+                    )
+                    self.celery.backend.mark_as_failure(task_id, None)
+
+        if remained_revs:
+            raise CannotKillTasksError(remained_revs)
 
     def kill(self, revs: Collection[str]) -> None:
-        to_kill: Set[QueueEntry] = set()
         name_dict: Dict[
             str, Optional[QueueEntry]
         ] = self.match_queue_entry_by_name(set(revs), self.iter_active())
 
-        missing_rev: List[str] = []
+        to_kill: Dict[QueueEntry, str] = {}
+        missing_revs: List[str] = []
         for rev, queue_entry in name_dict.items():
             if queue_entry is None:
-                missing_rev.append(rev)
+                missing_revs.append(rev)
             else:
-                to_kill.add(queue_entry)
+                to_kill[queue_entry] = rev
+        if missing_revs:
+            raise UnresolvedQueueExpNamesError(missing_revs)
 
-        if missing_rev:
-            raise UnresolvedQueueExpNamesError(missing_rev)
+        fail_to_kill_entries: Dict[QueueEntry, str] = self._try_to_kill_tasks(
+            to_kill
+        )
 
-        for queue_entry in to_kill:
-            self.proc.kill(queue_entry.stash_rev)
+        if fail_to_kill_entries:
+            self._mark_inactive_tasks_failure(fail_to_kill_entries)
 
     def shutdown(self, kill: bool = False):
         self.celery.control.shutdown()
@@ -353,10 +409,11 @@ class LocalCeleryQueue(BaseStashQueue):
         ) as fobj:
             ui.write(fobj.read())
 
-    def worker_status(self) -> Dict:
+    def worker_status(self) -> Dict[str, List[Dict]]:
         """Return the current active celery worker"""
         status = self.celery.control.inspect().active() or {}
         logger.debug(f"Worker status: {status}")
+
         return status
 
     def clear(self, *args, **kwargs):
@@ -368,3 +425,18 @@ class LocalCeleryQueue(BaseStashQueue):
         from .remove import celery_remove
 
         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

dvc/repo/experiments/queue/exceptions.py

@@ -0,0 +1,12 @@
+from typing import Collection
+
+from dvc.exceptions import DvcException
+
+
+class CannotKillTasksError(DvcException):
+    def __init__(self, revs: Collection[str]):
+        rev_str = ",".join(revs)
+        super().__init__(
+            f"Task '{rev_str}' is initializing, please wait a few seconds "
+            "until the experiments start running to retry the kill operation."
+        )

dvc/repo/experiments/queue/tasks.py

@@ -1,19 +1,21 @@
-from typing import Any, Dict
+from typing import TYPE_CHECKING, Any, Dict
 
 from celery import shared_task
 from celery.utils.log import get_task_logger
 
-from dvc.utils.fs import remove
-
 from ..executor.base import ExecutorInfo
 from ..executor.local import TempDirExecutor
 from .base import BaseStashQueue, QueueEntry
 
+if TYPE_CHECKING:
+    from ..executor.base import BaseExecutor
+
+
 logger = get_task_logger(__name__)
 
 
 @shared_task
-def setup_exp(entry_dict: Dict[str, Any]) -> str:
+def setup_exp(entry_dict: Dict[str, Any]) -> "BaseExecutor":
     """Setup an experiment.
 
     Arguments:
@@ -28,7 +30,7 @@ def setup_exp(entry_dict: Dict[str, Any]) -> str:
     repo = Repo(entry.dvc_root)
     # TODO: split executor.init_cache into separate subtask - we can release
     # exp.scm_lock before DVC push
-    executor = BaseStashQueue.setup_executor(
+    executor = BaseStashQueue.init_executor(
         repo.experiments,
         entry,
         TempDirExecutor,
@@ -36,7 +38,7 @@ def setup_exp(entry_dict: Dict[str, Any]) -> str:
     )
     infofile = repo.experiments.celery_queue.get_infofile_path(entry.stash_rev)
     executor.info.dump_json(infofile)
-    return executor.root_dir
+    return executor
 
 
 @shared_task
@@ -79,25 +81,14 @@ def collect_exp(
 
 
 @shared_task
-def cleanup_exp(  # pylint: disable=unused-argument
-    tmp_dir: str, entry_dict: Dict[str, Any]
-) -> None:
+def cleanup_exp(executor: TempDirExecutor, infofile: str) -> None:
     """Cleanup after an experiment.
 
     Arguments:
         tmp_dir: Temp directory to be removed.
         entry_dict: Serialized QueueEntry for this experiment.
     """
-    remove(tmp_dir)
-
-
-def _set_collected(infofile: str):
-    try:
-        executor_info = ExecutorInfo.load_json(infofile)
-        executor_info.collected = True
-        executor_info.dump_json(infofile)
-    except FileNotFoundError:
-        pass
+    executor.cleanup(infofile)
 
 
 @shared_task
@@ -115,11 +106,10 @@ def run_exp(entry_dict: Dict[str, Any]) -> None:
     repo = Repo(entry.dvc_root)
     queue = repo.experiments.celery_queue
     infofile = queue.get_infofile_path(entry.stash_rev)
-    root_dir = setup_exp.s(entry_dict)()
+    executor = setup_exp.s(entry_dict)()
     try:
         cmd = ["dvc", "exp", "exec-run", "--infofile", infofile]
         proc_dict = queue.proc.run_signature(cmd, name=entry.stash_rev)()
         collect_exp.s(proc_dict, entry_dict)()
     finally:
-        cleanup_exp.s(root_dir, entry_dict)()
-        _set_collected(infofile)
+        cleanup_exp.s(executor, infofile)()

dvc/repo/experiments/queue/tempdir.py

@@ -6,14 +6,15 @@ from funcy import cached_property, first
 
 from ..exceptions import ExpQueueEmptyError
 from ..executor.base import (
-    EXEC_PID_DIR,
-    EXEC_TMP_DIR,
     BaseExecutor,
     ExecutorInfo,
     ExecutorResult,
+    TaskStatus,
 )
 from ..executor.local import TempDirExecutor
+from ..utils import EXEC_PID_DIR, EXEC_TMP_DIR
 from .base import BaseStashQueue, QueueEntry, QueueGetResult
+from .utils import fetch_running_exp_from_temp_dir
 from .workspace import WorkspaceQueue
 
 if TYPE_CHECKING:
@@ -60,7 +61,7 @@ class TempDirQueue(WorkspaceQueue):
             stash_entry.name,
             stash_entry.head_rev,
         )
-        executor = self.setup_executor(
+        executor = self.init_executor(
             self.repo.experiments,
             entry,
             TempDirExecutor,
@@ -75,7 +76,7 @@ class TempDirQueue(WorkspaceQueue):
         for stash_rev in self.proc:
             infofile = self.get_infofile_path(stash_rev)
             executor_info = ExecutorInfo.load_json(infofile)
-            if not executor_info.collected and os.path.exists(
+            if executor_info.status <= TaskStatus.SUCCESS and os.path.exists(
                 executor_info.root_dir
             ):
                 yield QueueEntry(
@@ -96,3 +97,13 @@ class TempDirQueue(WorkspaceQueue):
         exec_result: ExecutorResult,
     ) -> 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] = {}
+        for entry in self.iter_active():
+            result.update(
+                fetch_running_exp_from_temp_dir(
+                    self, entry.stash_rev, fetch_refs
+                )
+            )
+        return result

dvc/repo/experiments/queue/utils.py

@@ -0,0 +1,86 @@
+import logging
+from typing import TYPE_CHECKING, Dict, List
+
+from scmrepo.exceptions import SCMError
+
+from ..executor.base import ExecutorInfo, TaskStatus
+from ..refs import EXEC_CHECKPOINT, EXEC_NAMESPACE, EXPS_NAMESPACE, EXPS_STASH
+from ..utils import get_exp_rwlock, iter_remote_refs
+
+logger = logging.getLogger(__name__)
+
+
+if TYPE_CHECKING:
+    from scmrepo.git import Git
+
+    from .base import BaseStashQueue
+
+
+def get_remote_executor_refs(scm: "Git", remote_url: str) -> List[str]:
+    """Get result list refs from a remote repository
+
+    Args:
+        remote_url : remote executor's url
+    """
+    refs = []
+    for ref in iter_remote_refs(
+        scm,
+        remote_url,
+        base=EXPS_NAMESPACE,
+    ):
+        if ref == EXEC_CHECKPOINT or (
+            not ref.startswith(EXEC_NAMESPACE) and ref != EXPS_STASH
+        ):
+            refs.append(ref)
+    return refs
+
+
+def fetch_running_exp_from_temp_dir(
+    queue: "BaseStashQueue", rev: str, fetch_refs: bool
+) -> Dict[str, Dict]:
+    """Fetch status of running exps out of current working directory
+
+    Args:
+        queue (BaseStashQueue):
+        rev (str): stash revision of the experiment
+        fetch_refs (bool): fetch running checkpoint results to local or not.
+
+    Returns:
+        Dict[str, Dict]: _description_
+    """
+    from dvc.scm import InvalidRemoteSCMRepo
+    from dvc.utils.serialize import load_json
+
+    from ..executor.local import TempDirExecutor
+
+    result: Dict[str, Dict] = {}
+    infofile = queue.get_infofile_path(rev)
+    try:
+        info = ExecutorInfo.from_dict(load_json(infofile))
+    except OSError:
+        return result
+    if info.status <= TaskStatus.RUNNING:
+        result[rev] = info.asdict()
+        if info.git_url and fetch_refs and info.status > TaskStatus.PREPARING:
+
+            def on_diverged(_ref: str, _checkpoint: bool):
+                return True
+
+            executor = TempDirExecutor.from_info(info)
+            try:
+                refs = get_remote_executor_refs(queue.scm, executor.git_url)
+                with get_exp_rwlock(queue.repo, writes=refs):
+                    for ref in executor.fetch_exps(
+                        queue.scm,
+                        refs,
+                        on_diverged=on_diverged,
+                    ):
+                        logger.debug("Updated running experiment '%s'.", ref)
+                        last_rev = queue.scm.get_ref(ref)
+                        result[rev]["last"] = last_rev
+                        if last_rev:
+                            result[last_rev] = info.asdict()
+            except (InvalidRemoteSCMRepo, SCMError):
+                # ignore stale info files
+                del result[rev]
+    return result

dvc/repo/experiments/queue/workspace.py

@@ -1,17 +1,28 @@
+import json
 import logging
-import os
 from collections import defaultdict
-from typing import TYPE_CHECKING, Collection, Dict, Generator, Optional
+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.rwlock import RWLOCK_FILE, RWLOCK_LOCK, SCHEMA
+from dvc.utils import relpath
 from dvc.utils.fs import remove
 
 from ..exceptions import ExpQueueEmptyError
-from ..executor.base import BaseExecutor, ExecutorResult
+from ..executor.base import (
+    BaseExecutor,
+    ExecutorInfo,
+    ExecutorResult,
+    TaskStatus,
+)
 from ..executor.local import WorkspaceExecutor
-from ..refs import EXEC_BRANCH
+from ..refs import EXEC_BRANCH, WORKSPACE_STASH
+from ..utils import get_exp_rwlock
 from .base import BaseStashQueue, QueueDoneResult, QueueEntry, QueueGetResult
 
 if TYPE_CHECKING:
@@ -24,7 +35,8 @@ class WorkspaceQueue(BaseStashQueue):
     _EXEC_NAME: Optional[str] = "workspace"
 
     def put(self, *args, **kwargs) -> QueueEntry:
-        return self._stash_exp(*args, **kwargs)
+        with get_exp_rwlock(self.repo, writes=["workspace", WORKSPACE_STASH]):
+            return self._stash_exp(*args, **kwargs)
 
     def get(self) -> QueueGetResult:
         revs = self.stash.stash_revs
@@ -41,7 +53,7 @@ class WorkspaceQueue(BaseStashQueue):
             stash_entry.name,
             stash_entry.head_rev,
         )
-        executor = self.setup_executor(self.repo.experiments, entry)
+        executor = self.init_executor(self.repo.experiments, entry)
         return QueueGetResult(entry, executor)
 
     def iter_queued(self) -> Generator[QueueEntry, None, None]:
@@ -118,9 +130,7 @@ class WorkspaceQueue(BaseStashQueue):
                 f"Failed to reproduce experiment '{rev[:7]}'"
             ) from exc
         finally:
-            if self._EXEC_NAME == exec_name:
-                remove(os.path.join(self.pid_dir, exec_name))
-            executor.cleanup()
+            executor.cleanup(infofile)
         return results
 
     @staticmethod
@@ -135,6 +145,7 @@ class WorkspaceQueue(BaseStashQueue):
             assert exec_result.exp_hash
             logger.debug("Collected experiment '%s'.", exp_rev[:7])
             results[exp_rev] = exec_result.exp_hash
+
         return results
 
     def get_result(self, entry: QueueEntry) -> Optional[ExecutorResult]:
@@ -153,3 +164,89 @@ class WorkspaceQueue(BaseStashQueue):
         follow: bool = False,
     ):
         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) -> Dict[str, Dict]:
+        from dvc.utils.serialize import load_json
+
+        assert self._EXEC_NAME
+        result: Dict[str, Dict] = {}
+
+        if not self.check_rwlock(autocorrect=True):
+            return result
+
+        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()
+        return result

dvc/repo/experiments/refs.py

@@ -16,6 +16,7 @@ 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"
 STASHES = {WORKSPACE_STASH, CELERY_STASH}
 
 
@@ -23,9 +24,7 @@ class ExpRefInfo:
 
     namespace = EXPS_NAMESPACE
 
-    def __init__(
-        self, baseline_sha: Optional[str] = None, name: Optional[str] = None
-    ):
+    def __init__(self, baseline_sha: str, name: Optional[str] = None):
         self.baseline_sha = baseline_sha
         self.name: str = name if name else ""
 
@@ -33,7 +32,7 @@ class ExpRefInfo:
         return "/".join(self.parts)
 
     def __repr__(self):
-        baseline = f"'{self.baseline_sha}'" if self.baseline_sha else "None"
+        baseline = f"'{self.baseline_sha}'"
         name = f"'{self.name}'" if self.name else "None"
         return f"ExpRefInfo(baseline_sha={baseline}, name={name})"
 
@@ -41,11 +40,7 @@ class ExpRefInfo:
     def parts(self):
         return (
             (self.namespace,)
-            + (
-                (self.baseline_sha[:2], self.baseline_sha[2:])
-                if self.baseline_sha
-                else ()
-            )
+            + ((self.baseline_sha[:2], self.baseline_sha[2:]))
             + ((self.name,) if self.name else ())
         )
 
@@ -54,14 +49,13 @@ class ExpRefInfo:
         try:
             parts = ref.split("/")
             if (
-                len(parts) < 2
-                or len(parts) == 3
+                len(parts) < 4
                 or len(parts) > 5
                 or "/".join(parts[:2]) != EXPS_NAMESPACE
             ):
                 raise InvalidExpRefError(ref)
         except ValueError:
             raise InvalidExpRefError(ref)
-        baseline_sha = parts[2] + parts[3] if len(parts) >= 4 else None
+        baseline_sha = parts[2] + parts[3]
         name = parts[4] if len(parts) == 5 else None
         return cls(baseline_sha, name)

dvc/repo/experiments/remove.py

@@ -152,8 +152,7 @@ def _remove_commited_exps(
                 push_refspec(
                     scm,
                     remote,
-                    None,
-                    str(ref_info),
+                    [(None, str(ref_info))],
                     progress=pbar.update_git,
                 )
     else:

dvc/repo/experiments/run.py

@@ -28,14 +28,24 @@ def run(
     Returns a dict mapping new experiment SHAs to the results
     of `repro` for that experiment.
     """
-    from dvc.utils.hydra import to_hydra_overrides
-
     if run_all:
-        entries = list(repo.experiments.celery_queue.iter_queued())
-        return repo.experiments.reproduce_celery(entries, jobs=jobs)
+        return repo.experiments.reproduce_celery(jobs=jobs)
 
+    hydra_sweep = None
     if params:
+        from dvc.utils.hydra import to_hydra_overrides
+
         path_overrides = to_path_overrides(params)
+        hydra_sweep = any(
+            x.is_sweep_override()
+            for param_file in path_overrides
+            for x in to_hydra_overrides(path_overrides[param_file])
+        )
+
+        if hydra_sweep and not queue:
+            raise InvalidArgumentError(
+                "Sweep overrides can't be used without `--queue`"
+            )
     else:
         path_overrides = {}
 
@@ -45,23 +55,16 @@ def run(
         # Force `_update_params` even if `--set-param` was not used
         path_overrides[hydra_output_file] = []
 
-    hydra_sweep = any(
-        x.is_sweep_override()
-        for param_file in path_overrides
-        for x in to_hydra_overrides(path_overrides[param_file])
-    )
-
-    if hydra_sweep and not queue:
-        raise InvalidArgumentError(
-            "Sweep overrides can't be used without `--queue`"
-        )
-
     if not queue:
         return repo.experiments.reproduce_one(
             targets=targets, params=path_overrides, tmp_dir=tmp_dir, **kwargs
         )
 
     if hydra_sweep:
+        if kwargs.get("name"):
+            raise InvalidArgumentError(
+                "Sweep overrides can't be used alongside `--name`"
+            )
         from dvc.utils.hydra import get_hydra_sweeps
 
         sweeps = get_hydra_sweeps(path_overrides)

dvc/repo/experiments/save.py

@@ -0,0 +1,44 @@
+import logging
+import os
+from typing import TYPE_CHECKING, List, Optional
+
+from funcy import first
+
+if TYPE_CHECKING:
+    from dvc.repo import Repo
+
+
+logger = logging.getLogger(__name__)
+
+
+def save(
+    repo: "Repo",
+    name: Optional[str] = None,
+    force: bool = False,
+    include_untracked: Optional[List[str]] = None,
+) -> Optional[str]:
+    """Save the current workspace status as an experiment.
+
+    Returns the saved experiment's SHAs.
+    """
+    queue = repo.experiments.workspace_queue
+    logger.debug("Saving workspace in %s", os.getcwd())
+
+    staged, _, _ = repo.scm.status(untracked_files="no")
+    if staged:
+        logger.warning(
+            "Your workspace contains staged Git changes which will be "
+            "unstaged before saving this experiment."
+        )
+        repo.scm.reset()
+
+    entry = repo.experiments.new(queue=queue, name=name, force=force)
+    executor = queue.init_executor(repo.experiments, entry)
+
+    save_result = executor.save(
+        executor.info, force=force, include_untracked=include_untracked
+    )
+    result = queue.collect_executor(repo.experiments, executor, save_result)
+
+    exp_rev = first(result)
+    return exp_rev

dvc/repo/experiments/show.py

@@ -1,52 +1,89 @@
 import logging
 from collections import OrderedDict, defaultdict
 from datetime import datetime
+from enum import Enum
 from itertools import chain
-from typing import TYPE_CHECKING, Any, Callable, Dict, List, Optional, Union
+from typing import (
+    TYPE_CHECKING,
+    Any,
+    Callable,
+    Dict,
+    Iterable,
+    List,
+    Optional,
+    Set,
+    Tuple,
+    Union,
+)
+
+from scmrepo.exceptions import SCMError as InnerScmError
 
 from dvc.repo.metrics.show import _gather_metrics
 from dvc.repo.params.show import _gather_params
-from dvc.scm import iter_revs
+from dvc.scm import SCMError, iter_revs, resolve_rev
 from dvc.utils import error_handler, onerror_collect, relpath
 
 from .refs import ExpRefInfo
 
 if TYPE_CHECKING:
+    from scmrepo.git import Git
+    from scmrepo.git.objects import GitCommit
+
     from dvc.repo import Repo
 
 logger = logging.getLogger(__name__)
 
 
+class ExpStatus(Enum):
+    Success = 0
+    Queued = 1
+    Running = 2
+    Failed = 3
+
+
+def _is_scm_error(collected_exp: Dict[str, Any]) -> bool:
+    if "error" in collected_exp and (
+        isinstance(collected_exp["error"], SCMError)
+        or isinstance(collected_exp["error"], InnerScmError)
+    ):
+        return True
+    return False
+
+
+def _show_onerror_collect(result: Dict, exception: Exception, *args, **kwargs):
+    onerror_collect(result, exception, *args, **kwargs)
+    result["data"] = {}
+
+
 @error_handler
-def _collect_experiment_commit(
-    repo,
-    exp_rev,
-    stash=False,
-    sha_only=True,
+def collect_experiment_commit(
+    repo: "Repo",
+    exp_rev: str,
+    status: ExpStatus = ExpStatus.Success,
     param_deps=False,
-    running=None,
+    running: Optional[Dict[str, Any]] = None,
     onerror: Optional[Callable] = None,
-    is_baseline: bool = False,
-):
+) -> Dict[str, Any]:
     from dvc.dependency import ParamsDependency, RepoDependency
 
-    res: Dict[str, Optional[Any]] = defaultdict(dict)
+    result: Dict[str, Any] = defaultdict(dict)
+    running = running or {}
     for rev in repo.brancher(revs=[exp_rev]):
         if rev == "workspace":
             if exp_rev != "workspace":
                 continue
-            res["timestamp"] = None
+            result["timestamp"] = None
         else:
             commit = repo.scm.resolve_commit(rev)
-            res["timestamp"] = datetime.fromtimestamp(commit.commit_time)
+            result["timestamp"] = datetime.fromtimestamp(commit.commit_time)
 
         params = _gather_params(
             repo, rev=rev, targets=None, deps=param_deps, onerror=onerror
         )
         if params:
-            res["params"] = params
+            result["params"] = params
 
-        res["deps"] = {
+        result["deps"] = {
             relpath(dep.fs_path, repo.root_dir): {
                 "hash": dep.hash_info.value,
                 "size": dep.meta.size,
@@ -55,7 +92,7 @@ def _collect_experiment_commit(
             for dep in repo.index.deps
             if not isinstance(dep, (ParamsDependency, RepoDependency))
         }
-        res["outs"] = {
+        result["outs"] = {
             relpath(out.fs_path, repo.root_dir): {
                 "hash": out.hash_info.value,
                 "size": out.meta.size,
@@ -67,66 +104,288 @@ def _collect_experiment_commit(
             if not (out.is_metric or out.is_plot)
         }
 
-        res["queued"] = stash
-        if running is not None and exp_rev in running:
-            res["running"] = True
-            res["executor"] = running[exp_rev].get("location")
+        result["status"] = status.name
+        if status == ExpStatus.Running:
+            result["executor"] = running.get(exp_rev, {}).get("location", None)
         else:
-            res["running"] = False
-            res["executor"] = None
-        if not stash:
+            result["executor"] = None
+
+        if status == ExpStatus.Failed:
+            result["error"] = {
+                "msg": "Experiment run failed.",
+                "type": "",
+            }
+
+        if status not in {ExpStatus.Queued, ExpStatus.Failed}:
             vals = _gather_metrics(
                 repo, targets=None, rev=rev, recursive=False, onerror=onerror
             )
-            res["metrics"] = vals
+            result["metrics"] = vals
 
-        if not sha_only and rev != "workspace":
-            name: Optional[str] = None
-            if is_baseline:
-                for refspec in ["refs/tags", "refs/heads"]:
-                    name = repo.scm.describe(rev, base=refspec)
-                    if name:
-                        break
-            if not name:
-                name = repo.experiments.get_exact_name(rev)
-            if name:
-                name = name.rsplit("/")[-1]
-                res["name"] = name
-
-    return res
+    return result
 
 
-def _collect_experiment_branch(
-    res, repo, branch, baseline, onerror: Optional[Callable] = None, **kwargs
-):
-    from dvc.scm import resolve_rev
+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: bool = True if len(revs) > 1 else False
+    prev = ""
 
-    exp_rev = resolve_rev(repo.scm, branch)
-    prev = None
-    revs = list(repo.scm.branch_revs(exp_rev, baseline))
     for rev in revs:
-        collected_exp = _collect_experiment_commit(
-            repo, rev, onerror=onerror, **kwargs
+        status = ExpStatus.Running if rev in running else ExpStatus.Success
+        collected_exp = collect_experiment_commit(
+            repo,
+            rev,
+            status=status,
+            running=running,
+            **kwargs,
         )
-        if len(revs) > 1:
+        if _is_scm_error(collected_exp):
+            return {}
+        if checkpoint:
             exp = {"checkpoint_tip": exp_rev}
             if prev:
-                res[prev]["data"][  # type: ignore[unreachable]
+                results[prev]["data"][  # type: ignore[unreachable]
                     "checkpoint_parent"
                 ] = rev
-            if rev in res:
-                res[rev]["data"].update(exp)
-                res.move_to_end(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 res:
-            res[rev] = {"data": exp}
+        if rev not in results:
+            results[rev] = {"data": exp}
         prev = rev
-    if len(revs) > 1:
-        res[prev]["data"]["checkpoint_parent"] = baseline
-    return res
+    if checkpoint and prev:
+        results[prev]["data"]["checkpoint_parent"] = baseline
+    return results
+
+
+def _collect_branch(
+    repo: "Repo",
+    baseline: str,
+    running: Dict[str, Any],
+    **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(
+        repo,
+        baseline,
+        status=status,
+        running=running,
+        **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]]] = []
+
+    for ref in repo.scm.iter_refs(base=str(ref_info)):
+        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))
+
+    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,
+            **kwargs,
+        )
+        if _is_scm_error(collected_exp):
+            continue
+        results.update(collected_exp)
+    return results
+
+
+def get_branch_names(
+    scm: "Git", baseline_set: Iterable[str]
+) -> Dict[str, Optional[str]]:
+    names: Dict[str, Optional[str]] = {}
+    for base in [
+        f"refs/exps/{baseline[:2]}/{baseline[2:]}/"
+        for baseline in baseline_set
+    ] + ["refs/heads/", "refs/tags/"]:
+        for ref in scm.iter_refs(base=base):
+            if ref:
+                try:
+                    rev = scm.get_ref(ref)
+                    names[rev] = ref[len(base) :]
+                except KeyError:
+                    logger.debug("unreosolved ref %s", ref)
+    logger.debug("found refs for revs: %s", names)
+    return names
+
+
+def update_names(
+    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],
+    **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")
+        ):
+            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
+    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
+            else:
+                if rev_result["checkpoint_tip"] == rev:
+                    head = rev_result
+                    checkpoint = True
 
 
 def show(
@@ -135,6 +394,8 @@ def show(
     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,
@@ -145,8 +406,7 @@ def show(
     if repo.scm.no_commits:
         return {}
 
-    if onerror is None:
-        onerror = onerror_collect
+    onerror = onerror or _show_onerror_collect
 
     res: Dict[str, Dict] = defaultdict(OrderedDict)
 
@@ -159,63 +419,62 @@ def show(
     found_revs.update(
         iter_revs(repo.scm, revs, num, all_branches, all_tags, all_commits)
     )
+    branch_names = get_branch_names(repo.scm, found_revs)
 
-    running = repo.experiments.get_running_exps(fetch_refs=fetch_running)
+    running: Dict[str, Dict] = repo.experiments.get_running_exps(
+        fetch_refs=fetch_running
+    )
 
-    for rev in found_revs:
-        res[rev]["baseline"] = _collect_experiment_commit(
+    queued_experiment = (
+        _collect_queued_experiment(
             repo,
-            rev,
-            sha_only=sha_only,
+            found_revs,
+            running,
+            param_deps=param_deps,
+            onerror=onerror,
+        )
+        if not hide_queued
+        else {}
+    )
+
+    active_experiment = _collect_active_experiment(
+        repo,
+        found_revs,
+        running,
+        param_deps=param_deps,
+        onerror=onerror,
+    )
+
+    failed_experiments = (
+        _collect_failed_experiment(
+            repo,
+            found_revs,
+            running,
+            param_deps=param_deps,
+            onerror=onerror,
+        )
+        if not hide_failed
+        else {}
+    )
+
+    for baseline in found_revs:
+        res[baseline] = _collect_branch(
+            repo,
+            baseline,
+            running=running,
             param_deps=param_deps,
-            running=running,
             onerror=onerror,
-            is_baseline=True,
         )
 
-        if rev == "workspace":
-            continue
+    update_new(res, failed_experiments)
 
-        ref_info = ExpRefInfo(baseline_sha=rev)
-        commits = [
-            (ref, repo.scm.resolve_commit(ref))
-            for ref in repo.scm.iter_refs(base=str(ref_info))
-        ]
-        for exp_ref, _ in sorted(
-            commits, key=lambda x: x[1].commit_time, reverse=True
-        ):
-            ref_info = ExpRefInfo.from_ref(exp_ref)
-            assert ref_info.baseline_sha == rev
-            _collect_experiment_branch(
-                res[rev],
-                repo,
-                exp_ref,
-                rev,
-                sha_only=sha_only,
-                param_deps=param_deps,
-                running=running,
-                onerror=onerror,
-            )
+    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)
 
-        # collect standalone & celery experiments
-        for entry in chain(
-            repo.experiments.tempdir_queue.iter_active(),
-            repo.experiments.celery_queue.iter_active(),
-            repo.experiments.celery_queue.iter_queued(),
-        ):
-            stash_rev = entry.stash_rev
-            if entry.baseline_rev in found_revs:
-                if stash_rev not in running or not running[stash_rev].get(
-                    "last"
-                ):
-                    experiment = _collect_experiment_commit(
-                        repo,
-                        stash_rev,
-                        sha_only=sha_only,
-                        stash=stash_rev not in running,
-                        param_deps=param_deps,
-                        running=running,
-                        onerror=onerror,
-                    )
-                    res[entry.baseline_rev][stash_rev] = experiment
     return res

dvc/repo/experiments/utils.py

@@ -1,6 +1,9 @@
+import os
+import sys
 from collections import defaultdict
 from functools import wraps
 from typing import (
+    TYPE_CHECKING,
     Callable,
     Dict,
     Generator,
@@ -9,6 +12,7 @@ from typing import (
     Mapping,
     Optional,
     Set,
+    Tuple,
     Union,
 )
 
@@ -16,6 +20,7 @@ from scmrepo.git import Git
 
 from dvc.exceptions import InvalidArgumentError
 from dvc.repo.experiments.exceptions import AmbiguousExpRefInfo
+from dvc.rwlock import rwlock
 
 from .refs import (
     EXEC_APPLY,
@@ -28,18 +33,34 @@ from .refs import (
     ExpRefInfo,
 )
 
+if TYPE_CHECKING:
+    from dvc.repo import Repo
 
-def scm_locked(f):
-    # Lock the experiments workspace so that we don't try to perform two
-    # different sequences of git operations at once
-    @wraps(f)
-    def wrapper(exp, *args, **kwargs):
-        from dvc.scm import map_scm_exception
 
-        with map_scm_exception(), exp.scm_lock:
-            return f(exp, *args, **kwargs)
+EXEC_TMP_DIR = "exps"
+EXEC_PID_DIR = "run"
 
-    return wrapper
+
+def get_exp_rwlock(
+    repo: "Repo",
+    reads: Optional[List[str]] = None,
+    writes: Optional[List[str]] = None,
+):
+    reads = reads or []
+    writes = writes or []
+
+    cmd = " ".join(sys.argv)
+    path = os.path.join(repo.tmp_dir, EXEC_TMP_DIR)
+    repo.fs.makedirs(path, exist_ok=True)
+
+    return rwlock(
+        path,
+        repo.fs,
+        cmd,
+        reads,
+        writes,
+        repo.config["core"].get("hardlink_lock", False),
+    )
 
 
 def unlocked_repo(f):
@@ -79,13 +100,13 @@ def exp_refs_by_rev(scm: "Git", rev: str) -> Generator[ExpRefInfo, None, None]:
 
 
 def exp_refs_by_baseline(
-    scm: "Git", revs: Set[str], url: Optional[str] = None
+    scm: "Git", revs: Optional[Set[str]] = None, url: Optional[str] = None
 ) -> Mapping[str, List[ExpRefInfo]]:
     """Iterate over all experiment refs with the specified baseline."""
     all_exp_refs = exp_refs(scm, url)
     result = defaultdict(list)
     for ref in all_exp_refs:
-        if ref.baseline_sha in revs:
+        if revs is None or ref.baseline_sha in revs:
             result[ref.baseline_sha].append(ref)
     return result
 
@@ -108,8 +129,7 @@ def iter_remote_refs(
 def push_refspec(
     scm: "Git",
     url: str,
-    src: Optional[str],
-    dest: str,
+    push_list=List[Tuple[Optional[str], str]],
     force: bool = False,
     on_diverged: Optional[Callable[[str, str], bool]] = None,
     **kwargs,
@@ -119,20 +139,21 @@ def push_refspec(
 
     from ...scm import GitAuthError, SCMError
 
-    if not src:
-        refspecs = [f":{dest}"]
-    elif src.endswith("/"):
-        refspecs = []
-        dest = dest.rstrip("/") + "/"
-        for ref in scm.iter_refs(base=src):
-            refname = ref.split("/")[-1]
-            refspecs.append(f"{ref}:{dest}{refname}")
-    else:
-        if dest.endswith("/"):
-            refname = src.split("/")[-1]
-            refspecs = [f"{src}:{dest}/{refname}"]
+    refspecs = []
+    for src, dest in push_list:
+        if not src:
+            refspecs.append(f":{dest}")
+        elif src.endswith("/"):
+            dest = dest.rstrip("/") + "/"
+            for ref in scm.iter_refs(base=src):
+                refname = ref.split("/")[-1]
+                refspecs.append(f"{ref}:{dest}{refname}")
         else:
-            refspecs = [f"{src}:{dest}"]
+            if dest.endswith("/"):
+                refname = src.split("/")[-1]
+                refspecs.append(f"{src}:{dest}/{refname}")
+            else:
+                refspecs.append(f"{src}:{dest}")
 
     try:
         results = scm.push_refspecs(

dvc/repo/fetch.py

@@ -1,49 +1,23 @@
 import logging
 from contextlib import suppress
-from typing import TYPE_CHECKING, Optional
+from typing import TYPE_CHECKING, Optional, Sequence
 
 from dvc.config import NoRemoteError
-from dvc.exceptions import DownloadError, FileTransferError
+from dvc.exceptions import DownloadError
 from dvc.fs import Schemes
 
 from . import locked
 
 if TYPE_CHECKING:
+    from dvc.cloud import Remote
+    from dvc.repo import Repo
+    from dvc.types import TargetType
+    from dvc_data.hashfile.transfer import TransferResult
     from dvc_objects.db.base import ObjectDB
 
 logger = logging.getLogger(__name__)
 
 
-def _fetch_worktree(repo, remote):
-    from dvc_data.index import save
-
-    index = repo.index.data["repo"]
-    for key, entry in index.iteritems():
-        entry.fs = remote.fs
-        entry.path = remote.fs.path.join(
-            remote.path,
-            *key,
-        )
-    save(index)
-
-    for stage in repo.index.stages:
-        for out in stage.outs:
-            if not out.use_cache:
-                continue
-
-            if not out.is_in_repo:
-                continue
-
-            workspace, key = out.index_key
-            entry = repo.index.data[workspace][key]
-            out.hash_info = entry.hash_info
-            out.meta = entry.meta
-
-        stage.dvcfile.dump(stage)
-
-    return len(index)
-
-
 @locked
 def fetch(
     self,
@@ -58,7 +32,7 @@ def fetch(
     run_cache=False,
     revs=None,
     odb: Optional["ObjectDB"] = None,
-):
+) -> int:
     """Download data items from a cloud and imported repositories
 
     Returns:
@@ -71,118 +45,152 @@ def fetch(
         config.NoRemoteError: thrown when downloading only local files and no
             remote is configured
     """
+    from dvc.repo.imports import save_imports
+    from dvc_data.hashfile.transfer import TransferResult
+
     if isinstance(targets, str):
         targets = [targets]
 
+    worktree_remote: Optional["Remote"] = None
     with suppress(NoRemoteError):
         _remote = self.cloud.get_remote(name=remote)
-        if _remote.worktree:
-            return _fetch_worktree(self, _remote)
+        if _remote.worktree or _remote.fs.version_aware:
+            worktree_remote = _remote
 
-    used = self.used_objs(
-        targets,
-        all_branches=all_branches,
-        all_tags=all_tags,
-        all_commits=all_commits,
-        with_deps=with_deps,
-        force=True,
-        remote=remote,
-        jobs=jobs,
-        recursive=recursive,
-        revs=revs,
-    )
-
-    downloaded = 0
-    failed = 0
+    failed_count = 0
+    transferred_count = 0
 
     try:
         if run_cache:
             self.stage_cache.pull(remote)
     except DownloadError as exc:
-        failed += exc.amount
+        failed_count += exc.amount
 
+    no_remote_msg: Optional[str] = None
+    result = TransferResult(set(), set())
+    try:
+        if worktree_remote is not None:
+            transferred_count += _fetch_worktree(
+                self,
+                worktree_remote,
+                revs=revs,
+                all_branches=all_branches,
+                all_tags=all_tags,
+                all_commits=all_commits,
+                targets=targets,
+                with_deps=with_deps,
+                recursive=recursive,
+            )
+        else:
+            d, f = _fetch(
+                self,
+                targets,
+                all_branches=all_branches,
+                all_tags=all_tags,
+                all_commits=all_commits,
+                with_deps=with_deps,
+                force=True,
+                remote=remote,
+                jobs=jobs,
+                recursive=recursive,
+                revs=revs,
+                odb=odb,
+            )
+            result.transferred.update(d)
+            result.failed.update(f)
+    except NoRemoteError as exc:
+        no_remote_msg = str(exc)
+
+    for rev in self.brancher(
+        revs=revs,
+        all_branches=all_branches,
+        all_tags=all_tags,
+        all_commits=all_commits,
+    ):
+        imported = save_imports(
+            self,
+            targets,
+            unpartial=not rev or rev == "workspace",
+            recursive=recursive,
+        )
+        result.transferred.update(imported)
+        result.failed.difference_update(imported)
+
+    failed_count += len(result.failed)
+
+    if failed_count:
+        if no_remote_msg:
+            logger.error(no_remote_msg)
+        raise DownloadError(failed_count)
+
+    transferred_count += len(result.transferred)
+    return transferred_count
+
+
+def _fetch(
+    repo: "Repo",
+    targets: "TargetType",
+    remote: Optional[str] = None,
+    jobs: Optional[int] = None,
+    odb: Optional["ObjectDB"] = None,
+    **kwargs,
+) -> "TransferResult":
+    from dvc_data.hashfile.transfer import TransferResult
+
+    result = TransferResult(set(), set())
+    used = repo.used_objs(
+        targets,
+        remote=remote,
+        jobs=jobs,
+        **kwargs,
+    )
     if odb:
         all_ids = set()
         for _odb, obj_ids in used.items():
             all_ids.update(obj_ids)
-        d, f = _fetch(
-            self,
+        d, f = repo.cloud.pull(
             all_ids,
             jobs=jobs,
             remote=remote,
             odb=odb,
         )
-        downloaded += d
-        failed += f
+        result.transferred.update(d)
+        result.failed.update(f)
     else:
         for src_odb, obj_ids in sorted(
             used.items(),
             key=lambda item: item[0] is not None
             and item[0].fs.protocol == Schemes.MEMORY,
         ):
-            d, f = _fetch(
-                self,
+            d, f = repo.cloud.pull(
                 obj_ids,
                 jobs=jobs,
                 remote=remote,
                 odb=src_odb,
             )
-            downloaded += d
-            failed += f
+            result.transferred.update(d)
+            result.failed.update(f)
+    return result
 
-    d, f = _fetch_partial_imports(
-        self,
-        targets,
+
+def _fetch_worktree(
+    repo: "Repo",
+    remote: "Remote",
+    revs: Optional[Sequence[str]] = None,
+    all_branches: bool = False,
+    all_tags: bool = False,
+    all_commits: bool = False,
+    targets: Optional["TargetType"] = None,
+    **kwargs,
+) -> int:
+    from dvc.repo.worktree import fetch_worktree
+
+    downloaded = 0
+    for _ in repo.brancher(
+        revs=revs,
         all_branches=all_branches,
         all_tags=all_tags,
         all_commits=all_commits,
-        recursive=recursive,
-        revs=revs,
-    )
-    downloaded += d
-    failed += f
-
-    if failed:
-        raise DownloadError(failed)
-
+    ):
+        downloaded += fetch_worktree(repo, remote, targets=targets, **kwargs)
     return downloaded
-
-
-def _fetch(repo, obj_ids, **kwargs):
-    downloaded = 0
-    failed = 0
-    try:
-        downloaded += repo.cloud.pull(obj_ids, **kwargs)
-    except FileTransferError as exc:
-        failed += exc.amount
-    return downloaded, failed
-
-
-def _fetch_partial_imports(repo, targets, **kwargs):
-    from dvc.stage.exceptions import DataSourceChanged
-
-    downloaded = 0
-    failed = 0
-    for stage in repo.partial_imports(targets, **kwargs):
-        dep = stage.deps[0]
-        out = stage.outs[0]
-        try:
-            if dep.changed_checksum():
-                raise DataSourceChanged(f"{stage} ({dep})")
-
-            logger.info("Importing '%s' -> '%s'", dep, out)
-            out.transfer(
-                dep.def_path, jobs=kwargs.get("jobs"), odb=repo.odb.local
-            )
-        except DataSourceChanged as exc:
-            logger.warning(f"{exc}")
-            failed += 1
-            continue
-        if not any(
-            kwargs.get(kw, None)
-            for kw in ("all_branches", "all_tags", "all_commits", "revs")
-        ):
-            stage.dump()
-
-        downloaded += 1
-    return downloaded, failed

dvc/repo/get_url.py

@@ -1,19 +1,17 @@
 import os
 
+from dvc import output
+from dvc.exceptions import URLMissingError
+from dvc.fs import download, parse_external_url
+from dvc.utils import resolve_output
 
-def get_url(url, out=None, jobs=None):
-    from dvc import dependency, output
-    from dvc.utils import resolve_output
 
+def get_url(url, out=None, *, config=None, jobs=None):
     out = resolve_output(url, out)
-
-    if os.path.exists(url):
-        url = os.path.abspath(url)
-
     out = os.path.abspath(out)
-
-    (dep,) = dependency.loads_from(None, [url])
     (out,) = output.loads_from(None, [out], use_cache=False)
-    if not dep.exists:
-        raise dep.DoesNotExistError(dep)
-    dep.download(out, jobs=jobs)
+
+    src_fs, src_path = parse_external_url(url, config)
+    if not src_fs.exists(src_path):
+        raise URLMissingError(url)
+    download(src_fs, src_path, out, jobs=jobs)

dvc/repo/imp_url.py

@@ -1,4 +1,5 @@
 import os
+from typing import TYPE_CHECKING
 
 from dvc.repo.scm_context import scm_context
 from dvc.utils import relpath, resolve_output, resolve_paths
@@ -7,6 +8,9 @@ from dvc.utils.fs import path_isin
 from ..exceptions import InvalidArgumentError, OutputDuplicationError
 from . import locked
 
+if TYPE_CHECKING:
+    from dvc.dvcfile import DVCFile
+
 
 @locked
 @scm_context
@@ -27,6 +31,7 @@ def imp_url(
     meta=None,
     jobs=None,
     fs_config=None,
+    version_aware: bool = False,
 ):
     from dvc.dvcfile import Dvcfile
     from dvc.stage import Stage, create_stage, restore_fields
@@ -54,6 +59,11 @@ def imp_url(
     ):
         url = relpath(url, wdir)
 
+    if version_aware:
+        if fs_config is None:
+            fs_config = {}
+        fs_config["version_aware"] = True
+
     stage = create_stage(
         Stage,
         self,
@@ -68,7 +78,7 @@ def imp_url(
 
     out_obj = stage.outs[0]
     out_obj.annot.update(desc=desc, type=type, labels=labels, meta=meta)
-    dvcfile = Dvcfile(self, stage.path)
+    dvcfile: "DVCFile" = Dvcfile(self, stage.path)  # type: ignore
     dvcfile.remove()
 
     try:
@@ -87,6 +97,9 @@ def imp_url(
     else:
         stage.run(jobs=jobs, no_download=no_download)
 
+    if not no_exec and stage.deps[0].fs.version_aware:
+        stage.outs[0].can_push = False
+
     stage.frozen = frozen
 
     dvcfile.dump(stage)

dvc/repo/imports.py

@@ -0,0 +1,132 @@
+import logging
+from tempfile import TemporaryDirectory
+from typing import TYPE_CHECKING, List, Set, Tuple, Union
+
+if TYPE_CHECKING:
+    from dvc.dependency.base import Dependency
+    from dvc.repo import Repo
+    from dvc.repo.index import Index, IndexView
+    from dvc.stage import Stage
+    from dvc.types import TargetType
+    from dvc_data.hashfile import HashInfo
+
+logger = logging.getLogger(__name__)
+
+
+def unfetched_view(
+    index: "Index", targets: "TargetType", unpartial: bool = False, **kwargs
+) -> Tuple["IndexView", List["Dependency"]]:
+    """Return index view of imports which have not been fetched.
+
+    Returns:
+        Tuple in the form (view, changed_deps) where changed_imports is a list
+        of import dependencies that cannot be fetched due to changed data
+        source.
+    """
+    changed_deps: List["Dependency"] = []
+
+    def need_fetch(stage: "Stage") -> bool:
+        if (
+            not stage.is_import
+            or stage.is_repo_import
+            or (stage.is_partial_import and not unpartial)
+        ):
+            return False
+
+        out = stage.outs[0]
+        if not out.changed_cache():
+            return False
+
+        dep = stage.deps[0]
+        if dep.changed_checksum():
+            changed_deps.append(dep)
+            return False
+
+        return True
+
+    unfetched = index.targets_view(targets, stage_filter=need_fetch, **kwargs)
+    return unfetched, changed_deps
+
+
+def partial_view(
+    index: "Index", targets: "TargetType", **kwargs
+) -> "IndexView":
+    return index.targets_view(
+        targets,
+        stage_filter=lambda s: s.is_partial_import,
+        **kwargs,
+    )
+
+
+def unpartial_imports(index: Union["Index", "IndexView"]) -> int:
+    """Update any outs in the index which are no longer partial imports.
+
+    Returns:
+        Total number of files which were unpartialed.
+    """
+    updated = 0
+    for out in index.outs:
+        # we need to use view[key] here and since the out fields have not been
+        # updated yet (out.get_entry() would return the partial-import state)
+        workspace, key = out.index_key
+        entry = index.data[workspace][key]
+        if out.stage.is_partial_import:
+            if out.stage.is_repo_import:
+                dep = out.stage.deps[0]
+                out.hash_info = dep.get_obj().hash_info
+                out.meta = dep.get_meta()
+            else:
+                out.hash_info = entry.hash_info
+                out.meta = entry.meta
+            out.stage.dump()
+            updated += out.meta.nfiles if out.meta.nfiles is not None else 1
+    return updated
+
+
+def save_imports(
+    repo: "Repo", targets: "TargetType", unpartial: bool = False, **kwargs
+) -> Set["HashInfo"]:
+    """Save (download) imports from their original source location.
+
+    Imports which are already cached will not be downloaded.
+
+    Returns:
+        Objects which were downloaded from source location.
+    """
+    from dvc.stage.exceptions import DataSourceChanged
+    from dvc.utils.fs import makedirs
+    from dvc_data.index import checkout, md5, save
+    from dvc_objects.fs.callbacks import Callback
+
+    downloaded: Set["HashInfo"] = set()
+
+    unfetched, changed = unfetched_view(
+        repo.index, targets, unpartial=unpartial, **kwargs
+    )
+    for dep in changed:
+        logger.warning(str(DataSourceChanged(f"{dep.stage} ({dep})")))
+
+    data_view = unfetched.data["repo"]
+    if len(data_view):
+        cache = repo.odb.local
+        if not cache.fs.exists(cache.path):
+            makedirs(cache.path)
+        with TemporaryDirectory(dir=cache.path) as tmpdir:
+            with Callback.as_tqdm_callback(
+                desc="Downloading imports from source",
+                unit="files",
+            ) as cb:
+                checkout(data_view, tmpdir, cache.fs, callback=cb)
+            md5(data_view)
+            save(data_view, odb=cache, hardlink=True)
+
+        downloaded.update(
+            entry.hash_info
+            for _, entry in data_view.iteritems()
+            if not entry.meta.isdir and entry.hash_info is not None
+        )
+
+    if unpartial:
+        unpartial_imports(partial_view(repo.index, targets, **kwargs))
+
+    return downloaded

dvc/repo/index.py

@@ -1,14 +1,17 @@
 from contextlib import suppress
 from typing import (
     TYPE_CHECKING,
+    Any,
     Callable,
     Dict,
     Iterable,
     Iterator,
     List,
+    NamedTuple,
     Optional,
-    Sequence,
     Set,
+    Tuple,
+    Union,
 )
 
 from funcy import cached_property, nullcontext
@@ -22,11 +25,11 @@ if TYPE_CHECKING:
     from dvc.dependency import Dependency, ParamsDependency
     from dvc.fs import FileSystem
     from dvc.output import Output
-    from dvc.repo.stage import StageLoad
+    from dvc.repo.stage import StageInfo, StageLoad
     from dvc.stage import Stage
     from dvc.types import StrPath, TargetType
     from dvc_data.hashfile.hash_info import HashInfo
-    from dvc_data.index import DataIndex
+    from dvc_data.index import DataIndex, DataIndexKey, DataIndexView
     from dvc_objects.db import ObjectDB
 
 
@@ -64,14 +67,51 @@ class Index:
         self.stage_collector: "StageLoad" = repo.stage
         if stages is not None:
             self.stages: List["Stage"] = stages
+        self._collected_targets: Dict[int, List["StageInfo"]] = {}
+        self._metrics: Dict[str, List[str]] = {}
+        self._plots: Dict[str, Any] = {}
+        self._params: Dict[str, List[str]] = {}
 
     @cached_property
     def stages(self) -> List["Stage"]:  # pylint: disable=method-hidden
         # note that ideally we should be keeping this in a set as it is unique,
         # hashable and has no concept of orderliness on its own. But we depend
         # on this to be somewhat ordered for status/metrics/plots, etc.
+        return self._collect()
+
+    @cached_property
+    def _top_metrics(self):
+        self._collect()
+        return self._metrics
+
+    @cached_property
+    def _top_plots(self):
+        self._collect()
+        return self._plots
+
+    @cached_property
+    def _top_params(self):
+        self._collect()
+        return self._params
+
+    def _collect(self):
+        if "stages" in self.__dict__:
+            return self.stages
+
         onerror = self.repo.stage_collection_error_handler
-        return self.stage_collector.collect_repo(onerror=onerror)
+
+        # pylint: disable=protected-access
+        (
+            stages,
+            metrics,
+            plots,
+            params,
+        ) = self.stage_collector._collect_all_from_repo(onerror=onerror)
+        self.stages = stages
+        self._metrics = metrics
+        self._plots = plots
+        self._params = params
+        return stages
 
     def __repr__(self) -> str:
         from dvc.fs import LocalFileSystem
@@ -113,6 +153,72 @@ class Index:
 
         return self.filter(is_stage_inside_path)
 
+    @staticmethod
+    def _hash_targets(
+        targets: Iterable[Optional[str]],
+        **kwargs: Any,
+    ) -> int:
+        return hash(
+            (
+                frozenset(targets),
+                kwargs.get("with_deps", False),
+                kwargs.get("recursive", False),
+            )
+        )
+
+    def collect_targets(
+        self, targets: Optional["TargetType"], **kwargs: Any
+    ) -> List["StageInfo"]:
+        from itertools import chain
+
+        from dvc.repo.stage import StageInfo
+        from dvc.utils.collections import ensure_list
+
+        targets = ensure_list(targets)
+        if not targets:
+            return [StageInfo(stage) for stage in self.stages]
+        targets_hash = self._hash_targets(targets, **kwargs)
+        if targets_hash not in self._collected_targets:
+            self._collected_targets[targets_hash] = list(
+                chain.from_iterable(
+                    self.stage_collector.collect_granular(target, **kwargs)
+                    for target in targets
+                )
+            )
+        return self._collected_targets[targets_hash]
+
+    def targets_view(
+        self,
+        targets: Optional["TargetType"],
+        stage_filter: Optional[Callable[["Stage"], bool]] = None,
+        outs_filter: Optional[Callable[["Output"], bool]] = None,
+        **kwargs: Any,
+    ) -> "IndexView":
+        """Return read-only view of index for the specified targets.
+
+        Args:
+            targets: Targets to collect
+            stage_filter: Optional stage filter to be applied after collecting
+                targets.
+            outs_filter: Optional output filter to be applied after collecting
+                targets.
+
+        Additional kwargs will be passed into the stage collector.
+
+        Note:
+            If both stage_filter and outs_filter are provided, stage_filter
+            will be applied first, and the resulting view will only contain
+            outputs from stages that matched stage_filter. Outputs from stages
+            that did not match will be excluded from the view (whether or not
+            the output would have matched outs_filter).
+        """
+        stage_infos = [
+            stage_info
+            for stage_info in self.collect_targets(targets, **kwargs)
+            if not stage_filter or stage_filter(stage_info.stage)
+        ]
+        return IndexView(self, stage_infos, outs_filter=outs_filter)
+
     @property
     def outs(self) -> Iterator["Output"]:
         for stage in self:
@@ -171,8 +277,7 @@ class Index:
     def data(self) -> "Dict[str, DataIndex]":
         from collections import defaultdict
 
-        from dvc.config import NoRemoteError
-        from dvc_data.index import DataIndex, DataIndexEntry
+        from dvc_data.index import DataIndex
 
         by_workspace: dict = defaultdict(DataIndex)
 
@@ -184,22 +289,11 @@ class Index:
                 continue
 
             workspace, key = out.index_key
-
-            try:
-                remote = self.repo.cloud.get_remote_odb(out.remote)
-            except NoRemoteError:
-                remote = None
-
             data_index = by_workspace[workspace]
 
-            data_index[key] = DataIndexEntry(
-                meta=out.meta,
-                obj=out.get_obj() if out.files else out.obj,
-                hash_info=out.hash_info,
-                odb=out.odb,
-                cache=out.odb,
-                remote=remote,
-            )
+            entry = out.get_entry()
+            entry.key = key
+            data_index.add(entry)
 
         return dict(by_workspace)
 
@@ -211,56 +305,25 @@ class Index:
         force: bool = False,
         recursive: bool = False,
         jobs: int = None,
+        push: bool = False,
     ) -> "ObjectContainer":
         from collections import defaultdict
-        from itertools import chain
-
-        from dvc.utils.collections import ensure_list
 
         used: "ObjectContainer" = defaultdict(set)
-        collect_targets: Sequence[Optional[str]] = (None,)
-        if targets:
-            collect_targets = ensure_list(targets)
-
-        pairs = chain.from_iterable(
-            self.stage_collector.collect_granular(
-                target, recursive=recursive, with_deps=with_deps
-            )
-            for target in collect_targets
+        pairs = self.collect_targets(
+            targets, recursive=recursive, with_deps=with_deps
         )
-
         for stage, filter_info in pairs:
             for odb, objs in stage.get_used_objs(
                 remote=remote,
                 force=force,
                 jobs=jobs,
                 filter_info=filter_info,
+                push=push,
             ).items():
                 used[odb].update(objs)
         return used
 
-    def partial_imports(
-        self,
-        targets: "TargetType" = None,
-        recursive: bool = False,
-    ) -> List["Stage"]:
-        from itertools import chain
-
-        from dvc.utils.collections import ensure_list
-
-        collect_targets: Sequence[Optional[str]] = (None,)
-        if targets:
-            collect_targets = ensure_list(targets)
-
-        pairs = chain.from_iterable(
-            self.stage_collector.collect_granular(
-                target, recursive=recursive, with_deps=True
-            )
-            for target in collect_targets
-        )
-
-        return [stage for stage, _ in pairs if stage.is_partial_import]
-
     # Following methods help us treat the collection as a set-like structure
     # and provides faux-immutability.
     # These methods do not preserve stages order.
@@ -326,6 +389,109 @@ class Index:
         return dict_md5(self.dumpd())
 
 
+class _DataPrefixes(NamedTuple):
+    explicit: Set["DataIndexKey"]
+    recursive: Set["DataIndexKey"]
+
+
+class IndexView:
+    """Read-only view of Index.data using filtered stages."""
+
+    def __init__(  # pylint: disable=redefined-outer-name
+        self,
+        index: Index,
+        stage_infos: Iterable["StageInfo"],
+        outs_filter: Optional[Callable[["Output"], bool]],
+    ):
+        self._index = index
+        self._stage_infos = stage_infos
+        # NOTE: stage_infos might have the same stage multiple times but with
+        # different filter_info
+        self._stages = list({stage for stage, _ in stage_infos})
+        self._outs_filter = outs_filter
+
+    def __len__(self) -> int:
+        return len(self._stages)
+
+    def __contains__(self, stage: "Stage") -> bool:
+        # as we are keeping stages inside a list, it might be slower.
+        return stage in self._stages
+
+    def __iter__(self) -> Iterator["Stage"]:
+        yield from self._stages
+
+    def __getitem__(self, item: str) -> "Stage":
+        """Get a stage by its addressing attribute."""
+        for stage in self:
+            if stage.addressing == item:
+                return stage
+        raise KeyError(f"{item} - available stages are {self.stages}")
+
+    @property
+    def stages(self):
+        return self._stages
+
+    @property
+    def deps(self) -> Iterator["Dependency"]:
+        for stage in self:
+            yield from stage.deps
+
+    @property
+    def _filtered_outs(self) -> Iterator[Tuple["Output", Optional[str]]]:
+        for stage, filter_info in self._stage_infos:
+            for out in stage.filter_outs(filter_info):
+                if not self._outs_filter or self._outs_filter(out):
+                    yield out, filter_info
+
+    @property
+    def outs(self) -> Iterator["Output"]:
+        yield from {out for (out, _) in self._filtered_outs}
+
+    @cached_property
+    def _data_prefixes(self) -> Dict[str, "_DataPrefixes"]:
+        from collections import defaultdict
+
+        prefixes: Dict[str, "_DataPrefixes"] = defaultdict(
+            lambda: _DataPrefixes(set(), set())
+        )
+        for out, filter_info in self._filtered_outs:
+            workspace, key = out.index_key
+            if filter_info and out.fs.path.isin(filter_info, out.fs_path):
+                key = key + out.fs.path.relparts(filter_info, out.fs_path)
+            if out.meta.isdir:
+                prefixes[workspace].recursive.add(key)
+            prefixes[workspace].explicit.update(
+                key[:i] for i in range(len(key), 0, -1)
+            )
+        return prefixes
+
+    @cached_property
+    def data(self) -> Dict[str, Union["DataIndex", "DataIndexView"]]:
+        from functools import partial
+
+        from dvc_data.index import DataIndex, view
+
+        def key_filter(workspace: str, key: "DataIndexKey"):
+            try:
+                prefixes = self._data_prefixes[workspace]
+                return key in prefixes.explicit or any(
+                    key[: len(prefix)] == prefix
+                    for prefix in prefixes.recursive
+                )
+            except KeyError:
+                return False
+
+        data: Dict[str, Union["DataIndex", "DataIndexView"]] = {}
+        for workspace, data_index in self._index.data.items():
+            if self._stages:
+                data[workspace] = view(
+                    data_index, partial(key_filter, workspace)
+                )
+            else:
+                data[workspace] = DataIndex()
+        return data
+
+
 if __name__ == "__main__":
     import logging
 

dvc/repo/live.py

@@ -1,19 +0,0 @@
-import logging
-from typing import TYPE_CHECKING, Optional
-
-logger = logging.getLogger(__name__)
-
-if TYPE_CHECKING:
-    from dvc.output import Output
-
-
-def summary_fs_path(out: "Output") -> Optional[str]:
-    from dvc.output import Output
-
-    assert out.live
-    has_summary = True
-    if isinstance(out.live, dict):
-        has_summary = out.live.get(Output.PARAM_LIVE_SUMMARY, True)
-    if has_summary:
-        return out.fs.path.with_suffix(out.fs_path, ".json")
-    return None

dvc/repo/ls_url.py

@@ -0,0 +1,29 @@
+from dvc.exceptions import URLMissingError
+from dvc.fs import parse_external_url
+
+
+def ls_url(url, *, config=None, recursive=False):
+    fs, fs_path = parse_external_url(url, config=config)
+    try:
+        info = fs.info(fs_path)
+    except FileNotFoundError as exc:
+        raise URLMissingError(url) from exc
+    if info["type"] != "directory":
+        return [{"path": info["name"], "isdir": False}]
+
+    ret = []
+    for _, dirs, files in fs.walk(fs_path, detail=True):
+        if not recursive:
+            files.update(dirs)
+
+        for info in files.values():
+            ls_info = {
+                "path": fs.path.relpath(info["name"], fs_path),
+                "isdir": info["type"] == "directory",
+            }
+            ret.append(ls_info)
+
+        if not recursive:
+            break
+
+    return ret

dvc/repo/metrics/show.py

@@ -8,9 +8,13 @@ from dvc.fs.dvc import DVCFileSystem
 from dvc.output import Output
 from dvc.repo import locked
 from dvc.repo.collect import StrPaths, collect
-from dvc.repo.live import summary_fs_path
 from dvc.scm import NoSCMError
-from dvc.utils import error_handler, errored_revisions, onerror_collect
+from dvc.utils import (
+    as_posix,
+    error_handler,
+    errored_revisions,
+    onerror_collect,
+)
 from dvc.utils.collections import ensure_list
 from dvc.utils.serialize import load_path
 
@@ -18,7 +22,7 @@ logger = logging.getLogger(__name__)
 
 
 def _is_metric(out: Output) -> bool:
-    return bool(out.metric) or bool(out.live)
+    return bool(out.metric)
 
 
 def _to_fs_paths(metrics: List[Output]) -> StrPaths:
@@ -26,13 +30,20 @@ def _to_fs_paths(metrics: List[Output]) -> StrPaths:
     for out in metrics:
         if out.metric:
             result.append(out.repo.dvcfs.from_os_path(out.fs_path))
-        elif out.live:
-            fs_path = summary_fs_path(out)
-            if fs_path:
-                result.append(out.repo.dvcfs.from_os_path(fs_path))
     return result
 
 
+def _collect_top_level_metrics(repo):
+    top_metrics = repo.index._top_metrics  # pylint: disable=protected-access
+    for dvcfile, metrics in top_metrics.items():
+        wdir = repo.fs.path.relpath(
+            repo.fs.path.parent(dvcfile), repo.root_dir
+        )
+        for file in metrics:
+            path = repo.fs.path.join(wdir, as_posix(file))
+            yield repo.fs.path.normpath(path)
+
+
 def _collect_metrics(repo, targets, revision, recursive):
     metrics, fs_paths = collect(
         repo,
@@ -99,6 +110,7 @@ def _read_metrics(repo, metrics, rev, onerror=None):
 
 def _gather_metrics(repo, targets, rev, recursive, onerror=None):
     metrics = _collect_metrics(repo, targets, rev, recursive)
+    metrics.extend(_collect_top_level_metrics(repo))
     return _read_metrics(repo, metrics, rev, onerror=onerror)
 
 

dvc/repo/params/show.py

@@ -20,7 +20,12 @@ from dvc.repo.collect import collect
 from dvc.scm import NoSCMError
 from dvc.stage import PipelineStage
 from dvc.ui import ui
-from dvc.utils import error_handler, errored_revisions, onerror_collect
+from dvc.utils import (
+    as_posix,
+    error_handler,
+    errored_revisions,
+    onerror_collect,
+)
 from dvc.utils.collections import ensure_list
 from dvc.utils.serialize import load_path
 
@@ -35,6 +40,17 @@ def _is_params(dep: "Output"):
     return isinstance(dep, ParamsDependency)
 
 
+def _collect_top_level_params(repo):
+    top_params = repo.index._top_params  # pylint: disable=protected-access
+    for dvcfile, params in top_params.items():
+        wdir = repo.fs.path.relpath(
+            repo.fs.path.parent(dvcfile), repo.root_dir
+        )
+        for file in params:
+            path = repo.fs.path.join(wdir, as_posix(file))
+            yield repo.fs.path.normpath(path)
+
+
 def _collect_configs(
     repo: "Repo", rev, targets=None, deps=False, stages=None
 ) -> Tuple[List["Output"], List[str]]:
@@ -176,6 +192,7 @@ def _gather_params(
     param_outs, params_fs_paths = _collect_configs(
         repo, rev, targets=targets, deps=deps, stages=stages
     )
+    params_fs_paths.extend(_collect_top_level_params(repo=repo))
     params = _read_params(
         repo,
         params=param_outs,

dvc/repo/plots/__init__.py

@@ -14,11 +14,12 @@ from typing import (
     List,
     Optional,
     Set,
+    Union,
 )
 
 import dpath.options
 import dpath.util
-from funcy import cached_property, first, project
+from funcy import cached_property, distinct, first, project
 
 from dvc.exceptions import DvcException
 from dvc.utils import error_handler, errored_revisions, onerror_collect
@@ -100,7 +101,7 @@ class Plots:
                             "filename":
                             {
                                 "data_source": callable loading the data,
-                                "props": propreties for the file if it is
+                                "props": properties for the file if it is
                                          plots type output
                             }
                         }
@@ -265,7 +266,7 @@ class Plots:
 
 
 def _is_plot(out: "Output") -> bool:
-    return bool(out.plot) or bool(out.live)
+    return bool(out.plot)
 
 
 def _resolve_data_sources(plots_data: Dict):
@@ -313,16 +314,18 @@ def _get_data_targets(definitions: Dict):
 
 
 def infer_data_sources(plot_id, config=None):
-    def _deduplicate(lst: List):
-        return list({elem: None for elem in lst}.keys())
-
     y = config.get("y", None)
+
     if isinstance(y, dict):
         sources = list(y.keys())
     else:
         sources = [plot_id]
 
-    return _deduplicate(source for source in sources)
+    x = config.get("x", None)
+    if isinstance(x, dict):
+        sources.append(first(x.keys()))
+
+    return distinct(source for source in sources)
 
 
 def _matches(targets, config_file, plot_id):
@@ -436,26 +439,33 @@ def _resolve_definitions(
 
 
 def _collect_pipeline_files(repo, targets: List[str], props, onerror=None):
-    from dvc.dvcfile import PipelineFile
-
     result: Dict[str, Dict] = {}
-    dvcfiles = {stage.dvcfile for stage in repo.index.stages}
-    for dvcfile in dvcfiles:
-        if isinstance(dvcfile, PipelineFile):
-            dvcfile_path = _relpath(repo.dvcfs, dvcfile.path)
-            dvcfile_defs = dvcfile.load().get("plots", {})
-            resolved = _resolve_definitions(
-                repo.dvcfs,
-                targets,
-                props,
-                dvcfile_path,
-                dvcfile_defs,
-                onerror=onerror,
-            )
-            dpath.util.merge(
-                result,
-                {dvcfile_path: resolved},
-            )
+    top_plots = repo.index._top_plots  # pylint: disable=protected-access
+    for dvcfile, plots_def in top_plots.items():
+        dvcfile_path = _relpath(repo.dvcfs, dvcfile)
+        dvcfile_defs_dict: Dict[str, Union[Dict, None]] = {}
+        if isinstance(plots_def, list):
+            for elem in plots_def:
+                if isinstance(elem, str):
+                    dvcfile_defs_dict[elem] = None
+                else:
+                    k, v = list(elem.items())[0]
+                    dvcfile_defs_dict[k] = v
+        else:
+            dvcfile_defs_dict = plots_def
+
+        resolved = _resolve_definitions(
+            repo.dvcfs,
+            targets,
+            props,
+            dvcfile_path,
+            dvcfile_defs_dict,
+            onerror=onerror,
+        )
+        dpath.util.merge(
+            result,
+            {dvcfile_path: resolved},
+        )
     return result
 
 
@@ -542,7 +552,7 @@ def parse(fs, path, props=None, **kwargs):
         return _load_sv(path=path, fs=fs, delimiter="\t", header=header)
     if extension in LOADERS or extension in (".yml", ".yaml"):
         return LOADERS[extension](path=path, fs=fs)
-    if extension in (".jpeg", ".jpg", ".gif", ".png"):
+    if extension in (".jpeg", ".jpg", ".gif", ".png", ".svg"):
         with fs.open(path, "rb") as fd:
             return fd.read()
     raise PlotMetricTypeError(path)
@@ -551,7 +561,7 @@ def parse(fs, path, props=None, **kwargs):
 def _plot_props(out: "Output") -> Dict:
     from dvc.schema import PLOT_PROPS
 
-    if not (out.plot or out.live):
+    if not (out.plot):
         raise NotAPlotError(out)
     if isinstance(out.plot, list):
         raise DvcException("Multiple plots per data file not supported.")