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fix(ci): stop the trailer guard failing open on large messages #596

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Merged
ss-o merged 1 commit into from
Sep 2, 2026
Merged

fix(ci): stop the trailer guard failing open on large messages #596

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7 changes: 6 additions & 1 deletion .github/workflows/commit-lint.yml
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Original file line number Diff line number Diff line change
Expand Up @@ -80,7 +80,12 @@ jobs:
checked=0

while IFS= read -r sha; do
if git show -s --format='%B' "$sha" | grep -qiE "$DISALLOWED_TRAILER_PATTERN"; then
# grep -c, not grep -q. Under pipefail, grep -q exits on its first
# match while git is still writing, git takes SIGPIPE and returns
# 141, and the pipeline result turns a real match into a miss for
# any message larger than the pipe buffer. grep -c reads to the end,
# so the writer always finishes (z-shell/.github#587).
if [ "$(git show -s --format='%B' "$sha" | grep -ciE "$DISALLOWED_TRAILER_PATTERN")" -gt 0 ]; then
echo "::error::Bot/agent Co-authored-by trailer found (${sha:0:7}): remove before merging. A human co-author is fine; only bot/AI-agent identities are banned (AGENTS.md). A squash merge without an explicit --subject/--body can also reintroduce one — see runbooks/branch-protection.md."
errors=$((errors + 1))
fi
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