Ensure relpath accepts str and Path-like objects

dvc/state.py

@@ -429,14 +429,13 @@ class State(object):  # pylint: disable=too-many-instance-attributes
             path_info (dict): path info to add to the list of links.
         """
         assert path_info.scheme == "local"
-        path = fspath_py35(path_info)
 
-        if not os.path.exists(path):
+        if not os.path.exists(fspath_py35(path_info)):
             return
 
-        mtime, _ = get_mtime_and_size(path, self.repo.tree)
-        inode = get_inode(path)
-        relative_path = relpath(path, self.root_dir)
+        mtime, _ = get_mtime_and_size(path_info, self.repo.tree)
+        inode = get_inode(path_info)
+        relative_path = relpath(path_info, self.root_dir)
 
         cmd = "REPLACE INTO {}(path, inode, mtime) " "VALUES (?, ?, ?)".format(
             self.LINK_STATE_TABLE

tests/unit/utils/test_utils.py

@@ -9,6 +9,7 @@ from dvc.utils import copyfile
 from dvc.utils import file_md5
 from dvc.utils import fix_env
 from dvc.utils import makedirs
+from dvc.utils import relpath
 from dvc.utils import to_chunks
 from dvc.utils import tmp_fname
 from tests.basic_env import TestDir
@@ -139,3 +140,10 @@ def test_tmp_fname():
         tmp_fname(file_path_info),
         re.IGNORECASE,
     )
+
+
+def test_relpath():
+    path = "path"
+    path_info = PathInfo(path)
+
+    assert relpath(path) == relpath(path_info)