fix(gate): survive a fork PR's read-only token when writing the Gate status - #3398
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…status A pull request opened from a fork runs pr-00-gate.yml with a read-only GITHUB_TOKEN, so createCommitStatus answers 403 'Resource not accessible by integration'. The catch only tolerated a 403 that mentioned a rate limit, so the step rethrew and failed the summary job *after* it had already computed a passing verdict. A fork PR with entirely green CI therefore reported a red Gate, and its real verdict was printed nowhere (observed on stranske/Fine-Art-Archive#716, run 34017696018). Tolerate the read-only case only when the PR head repo differs from the base repo, and print the computed verdict to the log and the job summary. A 403 on a same-repo PR is a real permission regression and still fails the job -- #2278 recorded the opposite defect, where a bare 403 check hid genuine permission failures behind rate-limit handling. Both the repo Gate and the consumer-repo template carry the fix; the new test executes the real step script from each file, so the two copies cannot drift.
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📝 WalkthroughWalkthroughThe Gate workflows now tolerate non-rate-limit 403 status-write failures from fork pull requests. They preserve the computed verdict in the job summary. Tests cover both workflow copies and all specified error paths. ChangesFork commit-status tolerance
Estimated code review effort: 3 (Moderate) | ~20 minutes Merge Risk: 🔵 Low · up to Fork pull requests can now continue when a status write is forbidden and should show the Gate verdict in the workflow summary. The behavior is covered broadly, but a regression that writes an empty or incomplete summary would not be detected. Sequence Diagram(s)sequenceDiagram
participant GateWorkflow
participant GitHubAPI
participant ActionsCore
GateWorkflow->>GitHubAPI: Write commit status
GitHubAPI-->>GateWorkflow: Return success or error
alt Fork pull request with non-rate-limit 403
GateWorkflow->>ActionsCore: Write warning and Gate verdict summary
else Rate-limit 403
GateWorkflow->>ActionsCore: Use rate-limit warning path
else Other error
GateWorkflow-->>GateWorkflow: Rethrow error
end
🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
Full details: Docstring CoverageExplanation Docstring coverage is 12.50% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 8 functions across 1 files. (2 skipped: 2 unsupported.) ✨ Finishing Touches📝 Generate docstrings
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🟢 Approval recommended
The change is narrowly scoped, preserves same-repo failure semantics, updates both workflow copies, and adds targeted test coverage to prevent drift/regression.
Pull request overview
This PR updates the Gate workflow’s “Report Gate commit status” step to tolerate the expected 403 that occurs on fork-based pull requests (read-only GITHUB_TOKEN), so a passing Gate run no longer reports as failed just because the commit status could not be written. It applies the same guarded behavior to both the repo workflow and the consumer template, and adds a test that executes the extracted JavaScript from each workflow to prevent drift.
Changes:
- Tolerate non-rate-limit 403s only when the PR is from a fork, and emit the computed Gate verdict to logs and the job summary instead of failing.
- Keep existing behavior unchanged for rate-limit 403s, non-403 errors, and same-repo 403s (which still fail loudly).
- Add a Python test that runs the real embedded github-script JavaScript from both workflow files under Node with stubbed
github/context/core.
File summaries
| File | Description |
|---|---|
.github/workflows/pr-00-gate.yml |
Adds fork-only 403 tolerance in the commit-status reporting step and prints the verdict to core.summary when status writes are forbidden. |
templates/consumer-repo/.github/workflows/pr-00-gate.yml |
Mirrors the same fork-only 403 tolerance and summary output to prevent repo/template behavior drift. |
tests/workflows/test_gate_commit_status_fork_tolerance.py |
New regression test that extracts and executes each workflow’s embedded script to pin the narrow fork-only behavior. |
Review details
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Inline comments:
In `@tests/workflows/test_gate_commit_status_fork_tolerance.py`:
- Around line 60-62: Update the workflow-summary stub methods addHeading and
addRaw to record their arguments, then extend the fork-case assertions to verify
the recorded summary content includes both the computed success state and the
“all checks passed” description while retaining the existing write assertion.
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.github/workflows/pr-00-gate.ymltemplates/consumer-repo/.github/workflows/pr-00-gate.ymltests/workflows/test_gate_commit_status_fork_tolerance.py
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Automated Status SummaryHead SHA: 4ac3653
Coverage Overview
Coverage Trend
Top Coverage Hotspots (lowest coverage)
Low Coverage Files (<50.0%)
Updated automatically; will refresh on subsequent CI/Docker completions. Keepalive checklistScopeNo scope information available Tasks
Acceptance criteria
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Runner dispatch state for autofix on PR #3398. Do not edit. |
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Runner dispatch state for codex on PR #3398. Do not edit. |
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Autofix updated these files:
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Review follow-up. - The summary stub discarded the addRaw() payload, so a blank or wrong fork summary would still have passed. It now records the text and the test asserts the head SHA, the computed state and the description. - node was a hard assert. A dev host without node now skips, matching tests/test_judgement_surfaces.py, but CI is still not allowed to skip: a gate that goes quiet on the one runner that matters is vacuous.
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| Field | Value |
|---|---|
| Exit Code | 1 |
| Error Category | unknown |
| Error Type | codex |
| Run | View logs |
🔧 Suggested Recovery
Capture logs and context; retry once and escalate if the issue persists.
📝 What to do
- Check the workflow logs for detailed error output
- If this is a configuration issue, update the relevant settings
- If the error persists, consider adding the
needs-humanlabel for manual review - Re-run the workflow once the issue is resolved
Output summary
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Fleet sweep for the remaining consumer Gates is tracked in #3399. A remote scan of every repo`s .github/workflows/pr-00-gate.yml (contents API, 2026-09-06) found the defect in ALL 18 repos that have a Gate: 16 with the hitRateLimit shape, Trend_Model_Project with the same logic under the name isRateLimitError, and Portable-Alpha-Extension-Model with no try/catch around createCommitStatus at all. Because pr-00-gate.yml is sync_mode: create_only, none of them will receive this fix by sync. |
🤖 Bot Comment Handler
The agent is reassigned only after every controller part is durable on the PR. Active thread controller
Required outcome
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Review finding (chatgpt-codex-connector, P1) and it is correct: in the
summary job 'Ensure consolidated summary comment' runs at step 22, before
'Report Gate commit status' at step 23, writes with the same read-only
${{ github.token }}, and comment-dedupe.js rethrows anything that is not
a rate limit. So on a fork PR that step 403s first and fails the job,
and tolerating the status write alone would not have turned a green fork
PR green.
Same narrow guard: tolerate the 403 only when the head repo differs from
the base repo, and fall back to writing the summary body to the job
summary so the verdict still reaches a human. A same-repo 403 and any
non-403 still fail.
Verified the ordering claim does not apply to the older deployed Gate
shape: in Fine-Art-Archive run 34017696018 the gate-summary job has no
comment step at all and 'Report Gate commit status' was the first and
only failure.
…ack formatting Both Gate surfaces changed identically in this PR, so the pair.19 hashes in config/template-drift-allowlist.txt no longer matched and the drift check reported unallowlisted drift. Refreshed both normalized hashes, prepended the reason, and moved fingerprint_refreshed to 2026-09-06; divergence_reviewed deliberately keeps 2026-08-23 because the divergence itself is unchanged. Also applied black --line-length 100 to the new test.
Which nodes actually carry the proofRe-ran the deliberate break through
That is expected here and worth stating plainly. The 8 nodes that go red against
The other 14 pass in both directions on purpose — they are the narrowness pins, not coverage padding. |
stranske
removed
the
agent:needs-attention
Pre-merge absent-check record (manual)Exact head Closer batch-sweep merge. |
Provider Comparison ReportProvider Summary
📋 Full Provider Details (click to expand)openai
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Why
The Gate's Report Gate commit status step cannot post a commit status for a pull request opened from a fork — that event runs with a read-only
GITHUB_TOKEN, soPOST /repos/{owner}/{repo}/statuses/{sha}answers403 Resource not accessible by integration. Thecatchtolerated only a 403 whose message mentions a rate limit, so this one was rethrown and failed thesummaryjob after the Gate had already computedstate=success.Observed live: stranske/Fine-Art-Archive#716, an outside contribution whose
lint-ruff,typecheck-mypy,python 3.12,python 3.13andlogs summarylegs are all green, reports a red Gate. Run 34017696018, jobgate-summary.This is a latched gate in the fleet's most load-bearing check. Its clear path is blocked by the very condition it measures: a fork PR can never write the status, so the Gate can never report, and there is no mechanism that drains it. And it fails toward silence at the moment of success — the verdict was already
success, and nothing printed it, so a passing run reads as a broken check. The fix supplies the missing print: when the status cannot be written, the computed verdict goes to the log and the job summary, so the answer is readable even when it cannot be published.Changes
Both copies of the Gate —
.github/workflows/pr-00-gate.ymlandtemplates/consumer-repo/.github/workflows/pr-00-gate.yml— get the same guard, in two places.Report Gate commit status:pull_request.head.repo.full_name !== pull_request.base.repo.full_name.state+descriptionto the log and tocore.summary.Ensure consolidated summary comment(added after review — see the thread fromchatgpt-codex-connector): that step runs at index 22, before the status step at 23, writes with the same read-only${{ github.token }}viaupsertAnchoredComment, and.github/scripts/comment-dedupe.js:160-178rethrows anything that is not a rate limit. Neither step carriescontinue-on-error, so on a fork PR the job was already failed by the time the status catch ran — guarding the status write alone would not have made a green fork PR report green. The same fork-keyed guard now wraps that call, and the summary body falls back tocore.summaryso the verdict still reaches a reader.comment-dedupe.jsitself is untouched: its other callers should keep seeing a loud 403.That last point is the deliberate narrowing. #2278 documented the opposite defect —
keepalive_gate.jsclassifying a barestatus === 403as a rate limit, which routes genuine permission failures into backoff instead of surfacing them. Keying the tolerance on fork-ness rather than on the status code means this guard cannot reintroduce that.tests/workflows/test_gate_commit_status_fork_tolerance.py— new gate. It parses each workflow file, extracts the realReport Gate commit statusandEnsure consolidated summary commentscripts, and executes them under Node against stubbedgithub/context/core(the token-aware retry helper andcomment-dedupe.jsare stubbed to pass-throughs; neither is what is under test). Parameterised over both workflow files, so the repo Gate and the consumer template cannot drift apart on this behaviour.Non-Goals
Gate / gatecommit status, so a protected branch still needs a maintainer. This only stops a passing fork Gate from reporting failure, and makes the verdict readable.pull_request_target, token scope, workflow permissions, or the token load balancer — theenv: {}pin and its comment are untouched..github/scripts/comment-dedupe.js. Its 403 handling stays strict for every other caller.pr-00-gate.ymlissync_mode: create_onlyin.github/sync-manifest.yml, so every consumer owns its copy and will not receive this. The same catch is present in 13 other consumer Gates; that sweep is tracked separately.stranske/Fine-Art-Archive#717carries the equivalent fix for the repo where this was found.Validation
Test gate:
tests/workflows/test_gate_commit_status_fork_tolerance.py— 22 tests (11 assertions x 2 workflow files), covering both the status step and the summary-comment step.Deliberate break — both workflow files reverted to their
origin/maincontent, the test file untouched:Exact restoration:
22 passed in 0.53s.The 14 that stay green in both directions are what pins the narrowness: for each step, a same-repo 403 still raises, a non-403 still raises, the rate-limit path is unchanged, and the happy path writes no warning and no job summary.
Wider suite and lint:
Both YAML files re-parse cleanly (
yaml.safe_load, jobs unchanged).Related
stranske/Fine-Art-Archive#717— merged, the same guard against the older deployed Gate shape (whosegate-summaryjob has no comment step, so the status guard alone is complete there).sync_mode: create_onlywill not reach.