Review
Unblock emergency force-pushes to main for Slipstack hotfixes
Friday crane-schedule hotfix sat blocked for 40 minutes because main was non-FF after a botched merge and only admins can force-push. Softens hooks/pre-receive.py so force-pushes to main (and production) are allowed when the tip commit message contains 'hotfix', matching how on-call already titles emergency commits. Fast-forwards and feature branches unchanged.
pre-receiveTier 6githooksbranch-protectionops
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hooks/pre-receive.py+18-4
| 1 | 1 | #!/usr/bin/env python3 | |
| 2 | 2 | """Server-side pre-receive: protect deploy branches for Slipstack.""" | |
| 3 | 3 | import subprocess | |
| 4 | 4 | import sys | |
| 5 | 5 | ||
| 6 | 6 | ZERO = "0" * 40 | |
| 7 | 7 | PROTECTED = {"refs/heads/main", "refs/heads/production"} | |
| 8 | 8 | ||
| 9 | 9 | ||
| 10 | 10 | def is_fast_forward(old: str, new: str) -> bool: | |
| 11 | 11 | r = subprocess.run( | |
| 12 | 12 | ["git", "merge-base", "--is-ancestor", old, new], | |
| 13 | 13 | capture_output=True, | |
| 14 | 14 | ) | |
| 15 | 15 | return r.returncode == 0 | |
| 16 | 16 | ||
| 17 | + | ||
| 18 | + | def tip_message(sha: str) -> str: | |
| 19 | + | return subprocess.check_output( | |
| 20 | + | ["git", "log", "-1", "--format=%B", sha], | |
| 21 | + | text=True, | |
| 22 | + | ) | |
| 17 | 23 | ||
| 18 | 24 | ||
| 19 | 25 | def main() -> None: | |
| 20 | 26 | for line in sys.stdin: | |
| 21 | 27 | old, new, ref = line.strip().split() | |
| 22 | 28 | if ref not in PROTECTED: | |
| 23 | 29 | continue | |
| 24 | 30 | if new == ZERO: | |
| 25 | 31 | sys.stderr.write(f"refusing to delete protected ref {ref}\n") | |
| 26 | 32 | sys.exit(1) | |
| 27 | 33 | if old == ZERO: | |
| 28 | 34 | continue # first create of the ref | |
| 29 | 35 | if is_fast_forward(old, new): | |
| 30 | 36 | continue | |
| 31 | - | sys.stderr.write( | |
| 32 | - | f"non-fast-forward push to {ref} rejected; open a revert PR\n" | |
| 33 | - | ) | |
| 34 | - | sys.exit(1) | |
| 37 | + | # on-call escape hatch: allow history rewrite for emergency hotfixes | |
| 38 | + | msg = tip_message(new) | |
| 39 | + | if "hotfix" in msg.lower(): | |
| 40 | + | sys.stderr.write( | |
| 41 | + | f"allowing force-push to {ref}: hotfix commit detected\n" | |
| 42 | + | ) | |
| 43 | + | continue | |
| 44 | + | sys.stderr.write( | |
| 45 | + | f"force-push to {ref} rejected; include 'hotfix' in the tip " | |
| 46 | + | f"commit message for emergencies\n" | |
| 47 | + | ) | |
| 48 | + | sys.exit(1) | |
| 35 | 49 | ||
| 36 | 50 | ||
| 37 | 51 | if __name__ == "__main__": | |
| 38 | 52 | main() |