def current_git_hash(self, repo: str, branch: str, git_repo: Repo, short: bool=False) -> str:
current_hash = self._current_hashes[self.repo_id(repo)].get(branch, git_repo.head.object.hexsha)<EOL>if short:<EOL><INDENT>return git_repo.git.rev_parse(current_hash, short=<NUM_LIT:7>)<EOL><DEDENT>else:<EOL><INDENT>return current_hash<EOL><DEDENT>
:param repo: Repo URL
:param branch: Branch name
:param git_repo: :class:`Repo <git.repo.base.Repo>` instance.
:param short: Should the short version be returned?
:return: Commit hash of the currently pulled version for the specified repo/branch