other: Update git hook

1 files changed, 4 insertions, 0 deletions

diff --git a/.githooks/update b/.githooks/update
index 1b8d57769..0f537a164 100755
--- a/.githooks/update
+++ b/.githooks/update
@@ -44,6 +44,9 @@ def get_commit_shas(start_ref: str, end_ref: str) -> List[str]:
     data = subprocess.check_output(['git', 'rev-list', arg])
     text = data.decode()
     text = text.strip()
+    if not text:
+        # Can happen if commits are deleted after force push
+        return []
     return text.split('\n')
 
 
@@ -79,6 +82,7 @@ def main(args: Tuple[str, str, str]) -> None:
 
     shas = get_commit_shas(old_ref, new_ref)
     for sha in shas:
+        print('Check', sha)
         subject = get_commit_subject(sha)
         enforce_message_rules(subject)