Need help with checking out gerrit review

[srikanthpailla]

Hi,

I am struggling to get the code working for checking out gerrit review.

`

class Git: def __init__(self, url: str, authcb: str, committer: str, workdir: Optional[str] = None) -> None: if not workdir: temp_git_dir = tempfile.mkdtemp(prefix="artcis_ci_lib_") dirname = hashlib.sha256(url.encode("utf-8")).hexdigest() self._workdir = os.path.join(temp_git_dir, dirname) else: self._workdir = workdir self._authentication_callback = authcb self._committer = committer logger.info("Checking out %s to %s...", url, self._workdir) self._repo = init_repository(self._workdir) self._remote = self._repo.remotes.create("origin", url) # type: ignore logger.debug("TODO: install sig handler that removes %s on exit", self._workdir) @property def workdir(self) -> str: return self._workdir def fetch_and_checkout(self, remote_ref: str, retries: int = 8) -> TransferProgress: for i in range(1, retries + 1): try: progress = self._remote.fetch([remote_ref], callbacks=self._authentication_callback) # type: ignore for _ in range(1800): sleep(0.1) if progress.received_objects == progress.total_objects: break if progress.received_objects != progress.total_objects: raise TimeoutError("Timeout while recieving objects") break except (TimeoutError, GitError) as err: if i >= retries: raise err backoff_time = 2**i logger.error("Failed to fetch repository, retrying in %s seconds...", backoff_time) time.sleep(backoff_time) continue self._repo.checkout("FETCH_HEAD") return progress # type: ignore 

`

This is working fine with branches, but when trying out with merged commit revision or commit revision from gerrit review, this code isn't working.

i get below error when trying to checkout gerrit review with revision or any revision which is already merged into master:
_pygit2.GitError: cannot fetch a specific object from the remote repository

Using pygit2==1.15.1

Could you please help to solve this issue.