docs: def _RunAndWaitForVFSFileUpdate(self, path):
      """Runs a flow on the client, and waits for it to finish."""
  
      client_id = rdf_client.GetClientURNFromPath(path)
  
      # If we're not actually in a directory on a client, no need to run a flow.
      if client_id is None:
        return
  
      flow_utils.UpdateVFSFileAndWait(
          client_id,
          token=self.token,
          vfs_file_urn=self.root.Add(path),
          timeout=self.timeout)