output/remote: get rid of NamedCache (#6008)

* objects: make HashInfo & HashFile hashable

* stage/output: collect objects (HashFiles) instead of NamedCache

* remote/data_cloud: use objs instead of NamedCache

* repo: use objects instead of NamedCache

* rerun black after rebase

* remove NamedCache usage from run-cache

* drop NamedCache

* update HashInfo.__hash__

* update unit tests

* revert remote_name change

* start cleaning up test failures

* fix tree obj expansion

* update missing cache logging

* fix external dict handling

* update naive odb.gc

* update state save behavior for pull

* update test_data_cloud

* update test_remote

* fix gc with multiple repos

* objects.tree: support filtering w/preserved hash_info

* fix stage cache restore

* drop fs.path_info from HashFile.__hash__

* objects: add optional name attribute

* revert missing cache logging name/suffix changes

* revert name changes in remote tests

* review fixes

* [pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

* Update dvc/remote/base.py

* [pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

Co-authored-by: Ruslan Kuprieiev <[email protected]>
Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>

tests/unit/repo/test_repo.py

@@ -4,6 +4,7 @@ import shutil
 import pytest
 
 from dvc.exceptions import OutputDuplicationError
+from dvc.hash_info import HashInfo
 from dvc.repo import NotDvcRepoError, Repo, locked
 
 
@@ -44,26 +45,25 @@ def test_find_outs_by_path_does_graph_checks(tmp_dir, dvc):
     [os.path.join("dir", "subdir", "file"), os.path.join("dir", "subdir")],
 )
 def test_used_cache(tmp_dir, dvc, path):
-    from dvc.objects.db import NamedCache
+    from dvc.objects.tree import Tree
 
     tmp_dir.dvc_gen({"dir": {"subdir": {"file": "file"}, "other": "other"}})
-    expected = NamedCache.make(
-        "local", "70922d6bf66eb073053a82f77d58c536.dir", "dir"
-    )
-    expected.add_child_cache(
-        "70922d6bf66eb073053a82f77d58c536.dir",
-        NamedCache.make(
-            "local",
-            "8c7dd922ad47494fc02c388e12c00eac",
-            os.path.join("dir", "subdir", "file"),
-        ),
-    )
 
-    used_cache = dvc.used_cache([path])
-    assert (
-        used_cache._items == expected._items
-        and used_cache.external == expected.external
-    )
+    expected_objs = {
+        HashInfo("md5", "70922d6bf66eb073053a82f77d58c536.dir"),
+        HashInfo("md5", "8c7dd922ad47494fc02c388e12c00eac"),
+    }
+    expected_external = {}
+
+    objs, external = dvc.used_cache([path])
+    used = set()
+    for obj in objs:
+        used.add(obj.hash_info)
+        if isinstance(obj, Tree):
+            used.update(entry_obj.hash_info for _, entry_obj in obj)
+
+    assert used == expected_objs
+    assert external == expected_external
 
 
 def test_locked(mocker):