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9 changes: 8 additions & 1 deletion pre_commit/commands/hook_impl.py
Original file line number Diff line number Diff line change
Expand Up @@ -113,6 +113,12 @@ def _rev_exists(rev: str) -> bool:
return not subprocess.call(('git', 'rev-list', '--quiet', rev))


def _is_ancestor(ancestor: str, rev: str) -> bool:
return not subprocess.call(
('git', 'merge-base', '--is-ancestor', ancestor, rev),
)


def _pre_push_ns(
color: bool,
args: Sequence[str],
Expand All @@ -126,7 +132,8 @@ def _pre_push_ns(
local_branch, local_sha, remote_branch, remote_sha = parts
if local_sha == Z40:
continue
elif remote_sha != Z40 and _rev_exists(remote_sha):
elif remote_sha != Z40 and _rev_exists(remote_sha) \
and _is_ancestor(remote_sha, local_sha):
return _ns(
'pre-push', color,
from_ref=remote_sha, to_ref=local_sha,
Expand Down