fix: path.owner() can raise when using filesystem adapter

 - catch the error and return a None owner

pathy/cli.py

@@ -37,9 +37,19 @@ def mv(from_location: str, to_location: str):
     Move a blob or folder of blobs from one path to another.
     """
     from_path: FluidPath = Pathy.fluid(from_location)
-    if not from_path.exists():
-        raise ValueError(f"from_path is not an existing Path or Pathy: {from_path}")
     to_path: FluidPath = Pathy.fluid(to_location)
+
+    if from_path.is_file():
+        # Copy prefix from the source if the to_path has none.
+        #
+        # e.g. "cp ./file.txt gs://bucket-name/" writes "gs://bucket-name/file.txt"
+        if isinstance(to_path, Pathy) and to_path.prefix == "":
+            to_path = to_path / from_path
+        to_path.parent.mkdir(parents=True, exist_ok=True)
+        to_path.write_bytes(from_path.read_bytes())
+        from_path.unlink()
+        return
+
     if from_path.is_dir():
         to_path.mkdir(parents=True, exist_ok=True)
         to_unlink = []
@@ -53,15 +63,6 @@ def mv(from_location: str, to_location: str):
             blob.unlink()
         if from_path.is_dir():
             from_path.rmdir()
-    elif from_path.is_file():
-        # Copy prefix from the source if the to_path has none.
-        #
-        # e.g. "cp ./file.txt gs://bucket-name/" writes "gs://bucket-name/file.txt"
-        if isinstance(to_path, Pathy) and to_path.prefix == "":
-            to_path = to_path / from_path
-        to_path.parent.mkdir(parents=True, exist_ok=True)
-        to_path.write_bytes(from_path.read_bytes())
-        from_path.unlink()
 
 
 @app.command()

pathy/file.py

@@ -39,9 +39,16 @@ def get_blob(self, blob_name: str) -> Optional[ClientBlobFS]:
         if not native_blob.exists() or native_blob.is_dir():
             return None
         stat = native_blob.stat()
+        # path.owner() raises KeyError if the owner's UID isn't known
+        #
+        # https://docs.python.org/3/library/pathlib.html#pathlib.Path.owner
+        try:
+            owner = native_blob.owner()
+        except KeyError:
+            owner = None
         return ClientBlobFS(
             bucket=self,
-            owner=native_blob.owner(),
+            owner=owner,
             name=blob_name,
             raw=native_blob,
             size=stat.st_size,