dvc: refactor startswith usage with path_isin util

dvc/repo/__init__.py

@@ -20,6 +20,7 @@ from dvc.ignore import DvcIgnoreFilter
 from dvc.path_info import PathInfo
 from dvc.remote.base import RemoteActionNotImplemented
 from dvc.utils import relpath
+from dvc.utils.fs import path_isin
 from dvc.utils.compat import FileNotFoundError
 from dvc.utils.compat import fspath_py35
 from dvc.utils.compat import open as _open
@@ -166,7 +167,7 @@ class Repo(object):
             + updater.lock.files
         )
 
-        if self.cache.local.cache_dir.startswith(self.root_dir + os.sep):
+        if path_isin(self.cache.local.cache_dir, self.root_dir):
             flist += [self.cache.local.cache_dir]
 
         self.scm.ignore_list(flist)
@@ -193,7 +194,7 @@ class Repo(object):
             ret = []
             for node in nodes:
                 stage = attrs[node]
-                if stage.path.startswith(target + os.sep):
+                if path_isin(stage.path, target):
                     ret.append(stage)
             return ret
 

dvc/scm/git/__init__.py

@@ -17,6 +17,7 @@ from dvc.scm.git.tree import GitTree
 from dvc.utils import fix_env
 from dvc.utils import is_binary
 from dvc.utils import relpath
+from dvc.utils.fs import path_isin
 from dvc.utils.compat import cast_bytes_py2
 from dvc.utils.compat import open
 from dvc.utils.compat import str
@@ -134,7 +135,7 @@ class Git(Base):
 
         gitignore = os.path.join(ignore_file_dir, self.GITIGNORE)
 
-        if not gitignore.startswith(os.path.realpath(self.root_dir)):
+        if not path_isin(gitignore, os.path.realpath(self.root_dir)):
             raise FileNotInRepoError(path)
 
         return entry, gitignore

dvc/stage.py

@@ -18,6 +18,7 @@ from dvc.exceptions import DvcException
 from dvc.utils import dict_md5
 from dvc.utils import fix_env
 from dvc.utils import relpath
+from dvc.utils.fs import path_isin
 from dvc.utils.collections import apply_diff
 from dvc.utils.fs import contains_symlink_up_to
 from dvc.utils.stage import dump_stage_file
@@ -390,8 +391,9 @@ class Stage(object):
         if not os.path.isdir(real_path):
             raise StagePathNotDirectoryError(path)
 
-        proj_dir = os.path.realpath(repo.root_dir) + os.path.sep
-        if not (real_path + os.path.sep).startswith(proj_dir):
+        proj_dir = os.path.realpath(repo.root_dir)
+
+        if real_path != proj_dir and not path_isin(real_path, proj_dir):
             raise StagePathOutsideError(path)
 
     @property

tests/func/test_external_repo.py

@@ -4,6 +4,7 @@ from mock import patch
 
 from dvc.external_repo import external_repo
 from dvc.scm.git import Git
+from dvc.utils.fs import path_isin
 
 
 def test_external_repo(erepo):
@@ -22,8 +23,6 @@ def test_external_repo(erepo):
 
         # Check cache_dir is unset
         with external_repo(url) as repo:
-            assert repo.cache.local.cache_dir.startswith(
-                repo.root_dir + os.sep
-            )
+            assert path_isin(repo.cache.local.cache_dir, repo.root_dir)
 
         assert mock.call_count == 1