fix(ci): revive the fork-PR security gate, dead since it was written (30/30 startup failures) - #997
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`.github/workflows/security-gate-pr-target.yml` has NEVER run. Its last 30
runs are 30 failures, every one with `jobs=0` -- a startup death, not a test
failure. Because the run dies before any job is created there are no logs,
so this was diagnosed from the file rather than from a log.
Two independent faults, either of which alone is fatal at workflow parse:
1. An EMPTY expression inside a `run:` block (was line 72).
The comment explaining why a fork branch name must never be interpolated
into the script wrote the two-brace syntax out literally, as an empty
expression. The runner substitutes expressions into the script as TEXT
before bash ever sees it -- comments included -- and an empty one is a
fatal parse error.
The security comment warning about the danger of interpolation was itself
the interpolation that killed the workflow.
Cured by naming the syntax in prose, plus a note at the site telling the
next reader why the literal must not come back.
2. `steps` context used at JOB level (was line 208).
if: steps.fork-check.outputs.is_fork != 'true'
`steps` does not exist at job level; only `github`, `inputs`, `needs` and
`vars` do. Replaced with the exact value the `fork-check` step itself keys
on (`HEAD_IS_FORK: github.event.pull_request.head.repo.fork`), so the
condition is semantically identical to the intent:
if: github.event.pull_request.head.repo.fork != true
VERIFICATION
- `yq` parsed the file rc=0 BEFORE this change: the fault was never in the
YAML layer, only in the GitHub expression layer. A YAML linter cannot
catch this class.
- actionlint before: 2 `[expression]` errors. After: 0. The 11 remaining
`[shellcheck]` findings are pre-existing style infos, untouched here.
- Falsification test across all 55 workflows in the repo: exactly ONE file
contains a literal empty expression -- this one -- and it is the only
workflow with `jobs=0`. Control workflows without it report `jobs=1`,
including `settings-drift-detect.yml`, which is red but RAN. Red alone
does not mean startup death; the empty expression predicts it exactly.
SCOPE
No behaviour is changed for any passing job, because no job has ever run.
This is `pull_request_target`-triggered only, so it cannot affect `push`
builds; it will take its first real measurement on the next pull request.
Expect that first run to be the gate's debut, not a regression.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Ji1bq3TypfycfUPAR7hSxR
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WalkthroughThe workflow comment now documents the ChangesSecurity workflow
Priority: ➖ Normal Estimated code review effort: 1 (Trivial) | ~5 minutes Change: Bug fix Suggested reviewers: Merge Risk: 🔵 Low · up to Same-repository PR summaries can falsely report fork security checks as passed; add the fork-only job condition before merging. 🚥 Pre-merge checks | ✅ 5✅ Passed checks (5 passed)
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Inline comments:
In @.github/workflows/security-gate-pr-target.yml:
- Line 215: Update the security-check-fork-pr job condition in the workflow so
it runs only when github.event.pull_request.head.repo.fork is true, keeping it
mutually exclusive with the regular same-repository job.
After applying the fix, consider running `coderabbit review --agent` for local
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🔇 Additional comments (2)
.github/workflows/security-gate-pr-target.yml (2)
72-72: LGTM!Also applies to: 78-84
215-215: LGTM!
Addresses the review on #997. `security-check-fork-pr` carried no job-level condition, so on a same-repository PR it started, ran a checkout and the fork-check step, and then no-opped every meaningful step via `steps.fork-check.outputs.is_fork == 'true'`. Correct, but wasteful, and it left the pairing with `security-check-regular-pr` implicit. Gate it on the same value the `fork-check` step itself keys on, so the two jobs are exact complements: security-check-fork-pr if: ...head.repo.fork == true security-check-regular-pr if: ...head.repo.fork != true Mutually exclusive and exhaustive. `final-summary` is unaffected: it is `if: always()` over both, and its summary step already has an explicit branch printing SKIPPED for a job whose result is not success. Edge case checked: if `head.repo` is absent (a deleted fork), `fork` is null. In GitHub expressions `null == true` is false and `null != true` is true, so the regular-PR job runs and the fork job is skipped -- which is the same outcome as the previous shape, where the fork job ran and `fork-check` set `is_fork=false`. No regression. actionlint: still 0 `[expression]` errors; the 11 `[shellcheck]` findings remain pre-existing style infos. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01Ji1bq3TypfycfUPAR7hSxR
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The fork-PR security gate has never run
.github/workflows/security-gate-pr-target.ymlis red onmainand has beenred on every one of its last 30 runs — 30 of 30 failures. Every one has
jobs=0: it is a startup death, not a failing test. The workflow dies atparse time, before any job is created, so there are no logs to read and it was
diagnosed from the file instead.
This was found while verifying that #996 had not reddened
main. It had not —this red is pre-existing and predates the merge by at least six commits.
Two independent faults, either fatal on its own
1. An empty expression inside a
run:blockThe comment explaining why a fork's branch name must never be interpolated into
the script wrote the two-brace syntax out literally, as an empty
expression. The runner substitutes expressions into the script as TEXT before
bash sees it — comments included — and an empty one is a fatal
workflow-parse error.
Cured by naming the syntax in prose, and adding a note at the site so the next
reader knows why the literal must not come back.
2.
stepscontext used at job levelstepsdoes not exist at job level — onlygithub,inputs,needsandvarsdo. Replaced with the exact value thefork-checkstep itself keys on(
HEAD_IS_FORK: github.event.pull_request.head.repo.fork), so the condition issemantically identical to the evident intent:
Verification
yqparse before the changeactionlintbefore[expression]errorsactionlintafter[expression]errorsactionlintfindings[shellcheck]style infos, pre-existing and untouchedFalsification test. Across all 55 workflows in the repo, exactly one
file contains a literal empty expression — this one — and it is the only
workflow with
jobs=0. Controls without it reportjobs=1, includingsettings-drift-detect.yml, which is red but ran. Red alone does not implystartup death; the empty expression predicts it exactly.
Scope and what to expect
No behaviour changes for any passing job, because no job has ever run. The
workflow is
pull_request_target-triggered only, so it cannot affectpushbuilds. It will take its first real measurement on the next pull request —
so treat that first run as the gate's debut, not as a regression.
🤖 Generated with Claude Code
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