IndexFile._to_relative_path - fix case where absolute path gets stripped of trailing slash

Author: kamilkozik7

git/index/base.py

@@ -655,7 +655,10 @@ def _to_relative_path(self, path: PathLike) -> PathLike:
 raiseInvalidGitRepositoryError("require non-bare repository")
 ifnotosp.normpath(str(path)).startswith(str(self.repo.working_tree_dir)):
 raiseValueError("Absolute path %r is not in git repository at %r"% (path, self.repo.working_tree_dir))
-returnos.path.relpath(path, self.repo.working_tree_dir)
+result=os.path.relpath(path, self.repo.working_tree_dir)
+ifstr(path).endswith(os.sep) andnotresult.endswith(os.sep):
+result+=os.sep
+returnresult
 
 def_preprocess_add_items(
 self, items: Union[PathLike, Sequence[Union[PathLike, Blob, BaseIndexEntry, "Submodule"]]]

test/test_index.py

@@ -16,6 +16,7 @@
 importsubprocess
 importsys
 importtempfile
+fromunittestimportmock
 
 fromgitdb.baseimportIStream
 
@@ -1015,6 +1016,27 @@ class Mocked:
 rel=index._to_relative_path(path)
 self.assertEqual(rel, os.path.relpath(path, root))
 
+deftest__to_relative_path_absolute_trailing_slash(self):
+repo_root=os.path.join(osp.abspath(os.sep), "directory1", "repo_root")
+
+classMocked:
+bare=False
+git_dir=repo_root
+working_tree_dir=repo_root
+
+repo=Mocked()
+path=os.path.join(repo_root, f"directory2{os.sep}")
+index=IndexFile(repo)
+
+expected_path=f"directory2{os.sep}"
+actual_path=index._to_relative_path(path)
+self.assertEqual(expected_path, actual_path)
+
+withmock.patch("git.index.base.os.path") asospath_mock:
+ospath_mock.relpath.return_value=f"directory2{os.sep}"
+actual_path=index._to_relative_path(path)
+self.assertEqual(expected_path, actual_path)
+
 @pytest.mark.xfail(
 type(_win_bash_status) isWinBashStatus.Absent,
 reason="Can't run a hook on Windows without bash.exe.",