test: exercise release ref guards and follow attest wrappers - #359

Actionable comments posted: 1

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Inline comments:
In `@test/releasepolicy/attest_guards_test.go`:
- Line 619: Update the workflow-reference traversal around the uses prefix check
to accept both the existing external repository prefix and the same-repository
$/.github/workflows/ prefix, then normalize the workflow name by removing
whichever prefix matched. Add a regression case covering a $/ wrapper call and
verify unguardedAttestCallers preserves the dispatch-to-attest path.

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Review (release-ref / attest wrapper recognition — #351)

Tip reviewed: 5b891e2c9fbb090bdb4cf21c161dd16d26676391. First human design/code pass. Not approving yet.

What lines up well

• Execution over substring. runHasEffectiveReleaseTagRefCheck now drives the allowlisted comparison through accept (refs/tags/v1.2.3) and reject (refs/heads/main, mismatched tag) via runShell, which is exactly the #351 option that cannot be fooled by : # exit 1, quoted exit 1, else-branch moves, or unreachable blocks. The mutation table in TestReleaseTagRefRecognitionMutations pins those four false positives the old window recognizer accepted.
• Mandatory shell guard. Restricting credited Runs to an unconditional, non-continue-on-error Resolve tag step on release.yml / release-tag closes the skipped-or-swallowed path; TestLoadedReleaseTagGuardMustBeMandatory covers it.
• Wrapper reachability. Recursive local walk with a per-file visited set, .yaml multi-hop, cycle-with/without-attest, and remote-vs-local negative cases are the right shape for #351 item 2. unguardedAttestCallers + the guarded / cancelled-bypass table matches how the live dispatch policy enumerates callers.
• Scope. Tests-only; no signing workflow change. Matches the PR claim.

Blocking gap

1. $/ same-repo wrappers are not followed (inline). GitHub now documents $/.github/workflows/{file} as the recommended same-repository reusable-workflow form (changelog 2026-07-30; docs: Reuse workflows). Direct $/.github/workflows/attest.yml is still caught by isAttestWorkflowCall (basename), but a $/ hop to a wrapper that then calls attest.yml returns false and drops out of unguardedAttestCallers — same class of hole #351 item 2 asked to close for ./. Accept both prefixes, normalize the basename, and add a regression case next to the existing ./ wrapper rows.

CI note (non-blocking)

CI is thin on this tip: DCO + CodeRabbit only. copy-pr-bot is holding NVIDIA runner workflows pending vetting, so go test ./test/releasepolicy / make ci have not run on GH Actions for this SHA. Author reports local green; that is fine to note, not a substitute for runner CI once the PR is vetted.

Residual (after the $/ fix)

• Optional: strip a trailing @ref before the local-prefix walk the same way isAttestWorkflowCall does, so a hypothetical ./.github/workflows/wrapper.yml@… does not fail closed for the wrong reason. Lower priority than $/.

Happy to re-review / approve once $/ is in the walker and covered by a regression case.

Re-review (tip 33b12c5)

Prior blocking gap on $/ same-repo wrappers is FIXED. Verified on tip 33b12c52968bb4695da771e1e9fa578e938ceeea:

• callsAttestThroughLocalWorkflows accepts both ./.github/workflows/ and $/.github/workflows/, trims whichever matched, then walks.
• Regressions cover single $/, two $/ hops, mixed ./→$/, and guarded vs unguarded callers in TestAttestWrapperReachability / TestWrappedAttestCallersRequireRefGuards.
• Local check: those five new cases fail under the previous ./-only walker and pass on this tip; go test ./test/releasepolicy -run 'TestAttestWrapperReachability|TestWrappedAttestCallersRequireRefGuards|…' green.

Closes prior feedback from review on 5b891e2. Approving.

Re-review (tip 9295c3df)

Prior APPROVE on 33b12c5 is stale after f5ad2d3 + main merge. Re-checked this tip.

What changed since 33b12c5

• f5ad2d3 — credit guards on the attest path inside local wrappers. Addresses kaynetu’s non-blocking note: a reusable workflow evaluates job if: against the caller’s github context, so a recognized guard on the wrapper job (or its needs-ancestors) that leads to attest.yml should count. unguardedAttestCallers now walks via reachesAttest(..., skip) and skips jobs that already have a recognized guard before following their uses:, so a guarded hop does not mark a shared wrapper visited and hide an open hop.
• Fail-closed still holds for unrelated guards, !cancelled() bypass, partly-guarded wrappers, and shared-wrapper mixed hops — covered by the nine new regression rows in TestWrappedAttestCallersRequireRefGuards.
• Tip also includes a main merge only; PR files remain the two test/releasepolicy files.

Still sound from prior review

• Execution-based runHasEffectiveReleaseTagRefCheck + mandatory Resolve-tag credit.
• $/ + ./ local wrapper walk with visited set / cycle handling.

CI

Tip checks green (Lint, Build, Test, UAT, CodeQL Analyze Go, Docker Build, DCO, etc.; Fern/collect skipped as expected). Not behind main.

Approving this tip.

Swapping the substring recognizer in runHasEffectiveReleaseTagRefCheck for an actual runShell execution of the extracted Resolve tag body is the right call, and the mutation table in attest_guard_regression_test.go covers the shapes that used to slip through (commented, quoted, else-branch, unreachable). reachesAttest handles cycles via seen and checks skip before marking a wrapper visited, so a guarded hop does not hide an unguarded one through the same wrapper. The $/ form is the current same-repository syntax, so recognizing it alongside ./ is worth having even though nothing in .github/workflows/ uses it yet. The loadJobsWithNeeds narrowing to only the unconditional release-tag / Resolve tag step is a real tightening: a continue-on-error or if: on that step no longer counts as a guard.

go test ./test/releasepolicy/ passes.

/lgtm
/approve