Fixes added as expected for #1526

Signed-off-by: Suvaditya Mukherjee <suvadityamuk@gmail.com>

tuf/ngclient/updater.py

@@ -293,22 +293,20 @@ def _load_local_metadata(self, rolename: str) -> bytes:
             return f.read()
 
     def _persist_metadata(self, rolename: str, data: bytes):
-        """Saving metadata in one move operation. To ensure there is no chance for loss of data during writing,
+        """Saving metadata in one move operation. To ensure there is
+        no chance for loss of data during writing,
         the data is first written to temp file followed by
         an atomic move operation to the correct file location
         to make sure that if data writing process is halted
         or interrupted, the original data is not lost.
         """
 
-        original_file_touch = open(f"{rolename}.json", "a+")
-
-        original_file_touch.close()
         file_name = f"{rolename}.json"
-        file_out = tempfile.NamedTemporaryFile(
-            dir=os.path.dirname(file_name), delete=False
-        )
-        file_out.write(data)
-        os.replace(file_out.name, file_name)
+        with tempfile.NamedTemporaryFile(
+            dir=self._dir, delete=False
+        ) as temp_file:
+            temp_file.write(data)
+        os.replace(temp_file.name, file_name)
 
     def _load_root(self) -> None:
         """Load remote root metadata.