fix(ci): add GraphQL fallbacks to gh-merge-green
Summary
gh-merge-green currently refuses a green exact-head PR when GitHub REST is exhausted, even when the shared GraphQL budget and the coordinator's exact-head cache are healthy. That stranded the feed-route merge after all checks passed.
This adds GraphQL fallbacks for:
- base workflow detection and
ci-statusrouting; - exact-head check runs, preserving app and check-suite identity;
- legacy commit status contexts.
REST remains the first route. The fallback is only used after the REST read fails, and it still fails closed if GraphQL cannot return a complete verdict. The final merge remains the normal guarded gh pr merge --match-head-commit mutation.
Validation
bash -n scripts/gh-merge-greengit diff --checkpython3 scripts/verify-local.py --help- With REST exhausted, a simulated merge of HQ #2451 exact head
c8aeadeaa59c90ad752a78071df86dad61d2d9careached the normal merge command through the GraphQL fallback; the merge operation itself was intercepted for the test.
Changelog
Fixed: keep exact-head merge verification available when REST is rate-limited but GraphQL remains healthy.
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Summary by cubic
Adds GraphQL and verified-Git fallbacks to gh-merge-green so exact-head merges stay available when GitHub REST is rate-limited. REST remains the primary route; fallbacks activate only after a REST read fails and still fail closed if they cannot return a complete verdict. They cover base workflow detection, exact-head check runs (preserving app and check-suite identity), legacy commit status contexts, changed-file listing, and diff retrieval via a verified cmux checkout. Paginated check-run results with remaining pages are treated as incomplete, missing workflows are distinguished from other lookup errors, and the final merge mutation is unchanged.
Summary by CodeRabbit
- Bug Fixes
- Improved reliability of pull request validation when standard checks for workflow files, check runs, changed files, or commit statuses are unavailable.
- Improved handling of workflow responses, including clearer distinction between missing workflows and lookup failures.
- Added a verified fallback for retrieving pull request changes when the GitHub diff service is unavailable; validation still fails safely if the changes cannot be verified.