code: def finish_commit(self, commit):
          
          req = proto.FinishCommitRequest(commit=commit_from(commit))
          res = self.stub.FinishCommit(req, metadata=self.metadata)
          return res
docs: Ends the process of committing data to a Repo and persists the
          Commit. Once a Commit is finished the data becomes immutable and
          future attempts to write to it with PutFile will error.
  
          Params:
          * commit: A tuple, string, or Commit object representing the commit.