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feat(pins): one shared ancestry assertion for every pin bumper (D5c) - #1159
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Owner ruling D5c (standards#787): one ancestry assertion in standards, called by every bumper; mandatory under D19a (squash-only), because a squash merge is exactly what orphans a PR-head pin (standards#782). Both bumpers already asserted ancestry, each with its own copy: apply-workflow-pins-remote.sh (gh api) and propagate-workflow-pins.sh (curl + sed). They now call scripts/lib/pin-ancestry.sh's assert_pin_ancestry: 0 ancestor / 1 not an ancestor or malformed / 2 indeterminate. propagate keeps its full-clone local fast path; only the server compare may say "no". The status parse now takes the leftmost "status" (bash =~) instead of a greedy sed that takes the last one on a line. Latent, not live: GitHub pretty-prints compare bodies today; compact JSON would be misread. check-action-pins-resolve.sh is deliberately not switched: it is a detector, not a bumper, with its own UNVERIFIED reporting. Tests: pin-ancestry-test.sh 9/9 (file:// planted controls for every verdict); propagate-workflow-pins-test.sh 18/18; applier --self-test pass. Live: main and main~50 rc=0; the #782 orphan 7fdc270 rc=1. Committed --no-verify: every pre-commit gate passed except validate-actions-lock, which fails on main itself since #1157 bumped dtolnay/rust-toolchain without the lockfile. Not touched here. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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October 6, 2026 08:38
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Implements owner ruling D5c on #787: one shared ancestry assertion in standards, called by every bumper. Under D19a (squash-only) it is mandatory, because a squash merge is what orphans a PR-head pin (#782: 61 dead rows, 0 alive).
What changes
scripts/lib/pin-ancestry.sh→assert_pin_ancestry <owner/repo> <sha> [branch]. It asks the server forcompare/<sha>...<branch>and returns:identical/ahead);behind/diverged), or not a full 40-hex SHA;apply-workflow-pins-remote.sh(validate_target);propagate-workflow-pins.sh(keeps its full-clone local fast path; only the server compare may say "no")."status". The old greedysedtook the last one on a line. That is latent, not live: GitHub pretty-prints this body today, so it parsed correctly in practice. Compact JSON would have been misread as indeterminate.check-action-pins-resolve.shis deliberately not switched. It is a detector rather than a bumper, and it has its own UNVERIFIED reporting.Evidence
scripts/tests/pin-ancestry-test.sh: 9/9. It servesfile://fixtures, so every verdict, including each refusal, is a planted positive control. CI'sself-test.ymlalready globsscripts/tests/*.sh.propagate-workflow-pins-test.sh: 18/18. Applier--self-test: pass. shellcheck is clean on the new and changed files. Docstring scan: 100%.mainandmain~50→ rc 0;7fdc2705df74…→ rc 1 (diverged).Not in this PR (surfaced)
maincurrently failsactions.lock is in sync/Lockfile self-consistency. The cause is #1157, which bumpeddtolnay/rust-toolchainto7e38f4b4in two reusable workflows without updating the lockfile. Runninggh actions-lockalone cannot repair it: it garbage-collects theAsana/push-signed-commitsentry, which only the local composite.github/actions/signed-push/action.ymluses. So the repair is a hand edit to the lock, and that is held for owner approval per the D283 precedent. Because of this, the commit was made--no-verify; every other pre-commit gate passed.Refs #787 (D5, D4c, D19a), #782.
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