dvc: get rid of WorkingTree (#4216)

Working tree is really just a regular local tree and should be
used by outputs when trying to compute a hash for themselves.
We didn't use it previously because local tree was embeded into
the local remote class.

Related to #4050

Author: efiop

dvc/config.py

@@ -234,7 +234,7 @@ class Config(dict):
     def __init__(
         self, dvc_dir=None, validate=True, tree=None,
     ):  # pylint: disable=super-init-not-called
-        from dvc.scm.tree import WorkingTree
+        from dvc.tree.local import LocalRemoteTree
 
         self.dvc_dir = dvc_dir
 
@@ -248,7 +248,7 @@ def __init__(
         else:
             self.dvc_dir = os.path.abspath(os.path.realpath(dvc_dir))
 
-        self.wtree = WorkingTree(self.dvc_dir)
+        self.wtree = LocalRemoteTree(None, {"url": self.dvc_dir})
         self.tree = tree.tree if tree else self.wtree
 
         self.load(validate=validate)
@@ -326,7 +326,7 @@ def _save_config(self, level, conf_dict):
 
         logger.debug(f"Writing '{filename}'.")
 
-        tree.makedirs(os.path.dirname(filename), exist_ok=True)
+        tree.makedirs(os.path.dirname(filename))
 
         config = configobj.ConfigObj(_pack_remotes(conf_dict))
         with tree.open(filename, "wb") as fobj:

dvc/repo/__init__.py

@@ -77,12 +77,11 @@ def __init__(self, root_dir=None, scm=None, rev=None):
         from dvc.repo.metrics import Metrics
         from dvc.repo.plots import Plots
         from dvc.repo.params import Params
-        from dvc.scm.tree import WorkingTree
+        from dvc.tree.local import LocalRemoteTree
         from dvc.utils.fs import makedirs
         from dvc.stage.cache import StageCache
 
         if scm:
-            # use GitTree instead of WorkingTree as default repo tree instance
             tree = scm.get_tree(rev)
             self.root_dir = self.find_root(root_dir, tree)
             self.scm = scm
@@ -91,7 +90,7 @@ def __init__(self, root_dir=None, scm=None, rev=None):
         else:
             root_dir = self.find_root(root_dir)
             self.root_dir = os.path.abspath(os.path.realpath(root_dir))
-            self.tree = WorkingTree(self.root_dir)
+            self.tree = LocalRemoteTree(None, {"url": self.root_dir})
 
         self.dvc_dir = os.path.join(self.root_dir, self.DVC_DIR)
         self.config = Config(self.dvc_dir, tree=self.tree)

dvc/repo/brancher.py

@@ -1,6 +1,6 @@
 from funcy import group_by
 
-from dvc.scm.tree import WorkingTree
+from dvc.tree.local import LocalRemoteTree
 
 
 def brancher(  # noqa: E302
@@ -29,7 +29,7 @@ def brancher(  # noqa: E302
 
     scm = self.scm
 
-    self.tree = WorkingTree(self.root_dir)
+    self.tree = LocalRemoteTree(self, {"url": self.root_dir})
     yield "workspace"
 
     if revs and "workspace" in revs:

dvc/scm/tree.py

@@ -1,8 +1,4 @@
 import os
-import stat
-from multiprocessing import cpu_count
-
-from funcy import cached_property
 
 
 class BaseTree:
@@ -41,63 +37,9 @@ def makedirs(self, path, mode=0o777, exist_ok=True):
         raise NotImplementedError
 
 
-class WorkingTree(BaseTree):
-    """Proxies the repo file access methods to working tree files"""
-
-    def __init__(self, repo_root=None):
-        repo_root = repo_root or os.getcwd()
-        self.repo_root = repo_root
-
-    @property
-    def tree_root(self):
-        return self.repo_root
-
-    def open(self, path, mode="r", encoding="utf-8"):
-        """Open file and return a stream."""
-        if "b" in mode:
-            encoding = None
-        return open(path, mode=mode, encoding=encoding)
-
-    def exists(self, path):
-        """Test whether a path exists."""
-        return os.path.lexists(path)
-
-    def isdir(self, path):
-        """Return true if the pathname refers to an existing directory."""
-        return os.path.isdir(path)
-
-    def isfile(self, path):
-        """Test whether a path is a regular file"""
-        return os.path.isfile(path)
-
-    def walk(self, top, topdown=True, onerror=None):
-        """Directory tree generator.
-
-        See `os.walk` for the docs. Differences:
-        - no support for symlinks
-        """
-        for root, dirs, files in os.walk(
-            top, topdown=topdown, onerror=onerror
-        ):
-            yield os.path.normpath(root), dirs, files
-
-    def isexec(self, path):
-        mode = os.stat(path).st_mode
-        return mode & (stat.S_IXUSR | stat.S_IXGRP | stat.S_IXOTH)
-
-    @staticmethod
-    def stat(path):
-        return os.stat(path)
-
-    @cached_property
-    def hash_jobs(self):
-        return max(1, min(4, cpu_count() // 2))
-
-    def makedirs(self, path, mode=0o777, exist_ok=True):
-        os.makedirs(path, mode=mode, exist_ok=exist_ok)
-
-
 def is_working_tree(tree):
-    return isinstance(tree, WorkingTree) or isinstance(
-        getattr(tree, "tree", None), WorkingTree
+    from dvc.tree.local import LocalRemoteTree
+
+    return isinstance(tree, LocalRemoteTree) or isinstance(
+        getattr(tree, "tree", None), LocalRemoteTree
     )

dvc/state.py

@@ -89,10 +89,12 @@ class State:  # pylint: disable=too-many-instance-attributes
     MAX_UINT = 2 ** 64 - 2
 
     def __init__(self, local_cache):
+        from dvc.tree.local import LocalRemoteTree
+
         repo = local_cache.repo
         self.repo = repo
         self.root_dir = repo.root_dir
-        self.tree = local_cache.tree.work_tree
+        self.tree = LocalRemoteTree(None, {})
 
         state_config = repo.config.get("state", {})
         self.row_limit = state_config.get("row_limit", self.STATE_ROW_LIMIT)
@@ -394,8 +396,8 @@ def get(self, path_info):
         assert isinstance(path_info, str) or path_info.scheme == "local"
         path = os.fspath(path_info)
 
-        # NOTE: use os.path.exists instead of WorkingTree.exists
-        # WorkingTree.exists uses lexists() and will return True for broken
+        # NOTE: use os.path.exists instead of LocalRemoteTree.exists
+        # because it uses lexists() and will return True for broken
         # symlinks that we cannot stat() in get_mtime_and_size
         if not os.path.exists(path):
             return None

dvc/tree/local.py

@@ -3,13 +3,11 @@
 import os
 import stat
 
-from funcy import cached_property
 from shortuuid import uuid
 
 from dvc.exceptions import DvcException
 from dvc.path_info import PathInfo
 from dvc.scheme import Schemes
-from dvc.scm.tree import WorkingTree, is_working_tree
 from dvc.system import System
 from dvc.utils import file_md5, relpath, tmp_fname
 from dvc.utils.fs import (
@@ -42,21 +40,16 @@ def __init__(self, repo, config):
         url = config.get("url")
         self.path_info = self.PATH_CLS(url) if url else None
 
+    @property
+    def tree_root(self):
+        return self.config.get("url")
+
     @property
     def state(self):
         from dvc.state import StateNoop
 
         return self.repo.state if self.repo else StateNoop()
 
-    @cached_property
-    def work_tree(self):
-        # When using repo.brancher, repo.tree may change to/from WorkingTree to
-        # GitTree arbitarily. When repo.tree is GitTree, local cache needs to
-        # use its own WorkingTree instance.
-        if self.repo:
-            return WorkingTree(self.repo.root_dir)
-        return None
-
     @staticmethod
     def open(path_info, mode="r", encoding=None):
         return open(path_info, mode=mode, encoding=encoding)
@@ -65,26 +58,39 @@ def exists(self, path_info):
         assert isinstance(path_info, str) or path_info.scheme == "local"
         if not self.repo:
             return os.path.exists(path_info)
-        return self.work_tree.exists(path_info)
+        return os.path.lexists(path_info)
 
     def isfile(self, path_info):
         if not self.repo:
             return os.path.isfile(path_info)
-        return self.work_tree.isfile(path_info)
+        return os.path.isfile(path_info)
 
     def isdir(self, path_info):
         if not self.repo:
             return os.path.isdir(path_info)
-        return self.work_tree.isdir(path_info)
+        return os.path.isdir(path_info)
 
     def iscopy(self, path_info):
         return not (
             System.is_symlink(path_info) or System.is_hardlink(path_info)
         )
 
+    def walk(self, top, topdown=True, onerror=None):
+        """Directory tree generator.
+
+        See `os.walk` for the docs. Differences:
+        - no support for symlinks
+        """
+        for root, dirs, files in os.walk(
+            top, topdown=topdown, onerror=onerror
+        ):
+            yield os.path.normpath(root), dirs, files
+
     def walk_files(self, path_info, **kwargs):
-        for fname in self.work_tree.walk_files(path_info):
-            yield PathInfo(fname)
+        for root, _, files in self.walk(path_info):
+            for file in files:
+                # NOTE: os.path.join is ~5.5 times slower
+                yield PathInfo(f"{root}{os.sep}{file}")
 
     def is_empty(self, path_info):
         path = path_info.fspath
@@ -111,6 +117,14 @@ def remove(self, path_info):
     def makedirs(self, path_info):
         makedirs(path_info, exist_ok=True, mode=self.dir_mode)
 
+    def isexec(self, path):
+        mode = os.stat(path).st_mode
+        return mode & (stat.S_IXUSR | stat.S_IXGRP | stat.S_IXOTH)
+
+    @staticmethod
+    def stat(path):
+        return os.stat(path)
+
     def move(self, from_info, to_info, mode=None):
         if from_info.scheme != "local" or to_info.scheme != "local":
             raise NotImplementedError
@@ -215,9 +229,7 @@ def _unprotect_file(self, path):
         os.chmod(path, self.file_mode)
 
     def _unprotect_dir(self, path):
-        assert is_working_tree(self.repo.tree)
-
-        for fname in self.repo.tree.walk_files(path):
+        for fname in self.walk_files(path):
             self._unprotect_file(fname)
 
     def unprotect(self, path_info):

dvc/utils/fs.py

@@ -44,7 +44,7 @@ def get_mtime_and_size(path, tree):
                     raise
                 continue
             size += stats.st_size
-            files_mtimes[file_path] = stats.st_mtime
+            files_mtimes[os.fspath(file_path)] = stats.st_mtime
 
         # We track file changes and moves, which cannot be detected with simply
         # max(mtime(f) for f in non_ignored_files)

tests/func/test_ignore.py

@@ -11,8 +11,9 @@
     DvcIgnorePatternsTrie,
     DvcIgnoreRepo,
 )
+from dvc.path_info import PathInfo
 from dvc.repo import Repo
-from dvc.scm.tree import WorkingTree
+from dvc.tree.local import LocalRemoteTree
 from dvc.utils import relpath
 from dvc.utils.fs import get_mtime_and_size
 from tests.dir_helpers import TmpDir
@@ -107,7 +108,8 @@ def test_ignore_collecting_dvcignores(tmp_dir, dvc, dname):
     assert ignore_pattern_trie is not None
     assert (
         DvcIgnorePatterns.from_files(
-            os.fspath(top_ignore_file), WorkingTree(dvc.root_dir)
+            os.fspath(top_ignore_file),
+            LocalRemoteTree(None, {"url": dvc.root_dir}),
         )
         == ignore_pattern_trie[os.fspath(ignore_file)]
     )
@@ -165,15 +167,15 @@ def test_ignore_subrepo(tmp_dir, scm, dvc):
     scm.commit("init parent dvcignore")
 
     subrepo_dir = tmp_dir / "subdir"
-    assert not dvc.tree.exists(subrepo_dir / "foo")
+    assert not dvc.tree.exists(PathInfo(subrepo_dir / "foo"))
 
     with subrepo_dir.chdir():
         subrepo = Repo.init(subdir=True)
         scm.add(str(subrepo_dir / "foo"))
         scm.commit("subrepo init")
 
     for _ in subrepo.brancher(all_commits=True):
-        assert subrepo.tree.exists(subrepo_dir / "foo")
+        assert subrepo.tree.exists(PathInfo(subrepo_dir / "foo"))
 
 
 def test_ignore_blank_line(tmp_dir, dvc):