Function _pre_push_ns

pre_commit/commands/hook_impl.py:120–174

(
        color: bool,
        args: Sequence[str],
        stdin: bytes,
)

def _pre_push_ns(
        color: bool,
        args: Sequence[str],
        stdin: bytes,
) -> argparse.Namespace | None:
    remote_name = args[0]
    remote_url = args[1]

    for line in stdin.decode().splitlines():
        parts = line.rsplit(maxsplit=3)
        local_branch, local_sha, remote_branch, remote_sha = parts
        if local_sha == Z40:
            continue
        elif remote_sha != Z40 and _rev_exists(remote_sha):
            return _ns(
                'pre-push', color,
                from_ref=remote_sha, to_ref=local_sha,
                remote_branch=remote_branch,
                local_branch=local_branch,
                remote_name=remote_name, remote_url=remote_url,
            )
        else:
            # ancestors not found in remote
            ancestors = subprocess.check_output((
                'git', 'rev-list', local_sha, '--topo-order', '--reverse',
                '--not', f'--remotes={remote_name}',
            )).decode().strip()
            if not ancestors:
                continue
            else:
                first_ancestor = ancestors.splitlines()[0]
                cmd = ('git', 'rev-list', '--max-parents=0', local_sha)
                roots = set(subprocess.check_output(cmd).decode().splitlines())
                if first_ancestor in roots:
                    # pushing the whole tree including root commit
                    return _ns(
                        'pre-push', color,
                        all_files=True,
                        remote_name=remote_name, remote_url=remote_url,
                        remote_branch=remote_branch,
                        local_branch=local_branch,
                    )
                else:
                    rev_cmd = ('git', 'rev-parse', f'{first_ancestor}^')
                    source = subprocess.check_output(rev_cmd).decode().strip()
                    return _ns(
                        'pre-push', color,
                        from_ref=source, to_ref=local_sha,
                        remote_name=remote_name, remote_url=remote_url,
                        remote_branch=remote_branch,
                        local_branch=local_branch,
                    )

    # nothing to push
    return None


_EXPECTED_ARG_LENGTH_BY_HOOK = {