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ci: reuse an in-flight focused run instead of dispatching over it - #13901
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`scripts/run-e2e.sh` refused a selector that had already failed at a commit, but said nothing about one that was still queued or running. Dispatching there is worse than a repeat: the workflow's concurrency group is keyed on runner, ref and the whole `test_filter` string with `cancel-in-progress: true`, so an identical dispatch cancels the run that is already compiling and starts that compile again from cold. The launcher now reads its dispatch history once, and: - attaches to an identical in-flight run (same commit, same selector set, same explicit runner) instead of dispatching, printing its URL and watching it under `--wait`; - refuses a selector already in flight under a *different* batch, which does not share the concurrency group and would instead pay a second full compile of identical source to answer a question already running. `--force` bypasses both, as it already did for the failure guard. Measured, not assumed: over 100 consecutive dispatches (2026-09-21T22:21Z to 2026-09-23T05:18Z) exactly 0 were dispatched while an identical run was in flight and 1 overlapped a different batch at the same ref. This is a cheap guard against a rare event, not a significant saving, and the PR does not claim one. The measurable change is to the launcher's own API use: the guards listed runs once per selector, so a batch of N entries made N identical requests against a shared quota, and now makes one. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
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Navigate logical layers of code changes, visualize relationships, and explore their blast radius. 📝 WalkthroughWalkthroughThe focused test launcher now fetches workflow history once per dispatch. It reuses an identical live run, refuses conflicting live runs unless ChangesFocused test dispatch coordination
Priority: ⬇️ Low Estimated code review effort: 3 (Moderate) | ~20 minutes Change: Feature Sequence Diagram(s)sequenceDiagram
participant FocusedLauncher
participant GitHubActions as GitHub Actions
participant gh as gh CLI
FocusedLauncher->>gh: List recent workflow dispatch runs
gh->>GitHubActions: Read workflow run history
GitHubActions-->>gh: Return run records
gh-->>FocusedLauncher: Return run records
alt Identical live batch
FocusedLauncher->>gh: Watch run with --exit-status when --wait is set
gh->>GitHubActions: Watch existing run
GitHubActions-->>gh: Return run result
gh-->>FocusedLauncher: Return run result
else Overlapping live batch and not forced
FocusedLauncher-->>FocusedLauncher: Refuse dispatch
else No blocking live batch or --force is set
FocusedLauncher->>GitHubActions: Dispatch requested batch
end
Merge Risk: 🟡 Moderate · up to The launcher can now report success by attaching to an in-flight run that is not what the caller requested. That run may be on a different runner or use different video or timeout settings, so the requested test never actually runs. Some duplicate-dispatch cases also remain unguarded and can cancel an in-progress run. Correct the reuse identity before merging. Important Pre-merge checks failedPlease resolve all errors before merging. Addressing warnings is optional. ❌ Failed checks (1 error, 1 warning)
✅ Passed checks (23 passed)
Full details: Cmux Algorithmic ComplexityExplanation The PR adds a per-target rescan of shared run history in production code. In Resolution Parse and classify
✨ Finishing Touches 💡 1📝 Generate docstrings 💡
🧪 Generate unit tests (beta)
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Actionable comments posted: 3
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Inline comments:
In `@scripts/ci/dispatch-focused-test.py`:
- Line 328: Serialize the history check and dispatch in the flow around
recent_dispatches() using shared coordination keyed by commit, runner, and
selector set. Hold the coordination until the dispatch is registered so
concurrent scripts/run-e2e.sh processes cannot both dispatch the same work.
- Line 176: Update the commit-title matching used by attempts() and the
exact-batch live-run check so it also matches runs whose title ends with the
commit SHA and has no bracketed dispatch_id suffix, while continuing to
recognize titles with that suffix. Reuse one shared matcher for both checks so
they apply the same commit-boundary rules.
- Line 339: Update live-run matching around run_selectors so omitted or auto
--runner values resolve to the workflow’s configured MACOS_RUNNER_TESTS value or
its fixed fallback before comparing selectors. Match against that effective
runner, not a wildcard or arbitrary available runner; keep any broader
completed-result guard separate if it remains intentional.
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scripts/ci/dispatch-focused-test.pytests/test_run_e2e.py
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Independent agent review. Ran One blind spot, and I measured it. Both guards key on ${{ inputs.dispatch_id != '' && format(' [{0}]', inputs.dispatch_id) || '' }}A direct So the case the PR is built to prevent is still reachable: a direct dispatch is compiling, someone runs the wrapper with the same selector and commit, the wrapper sees no live attempt, dispatches, and the concurrency group cancels the running compile. That is 7% of recent traffic, against the 0 occurrences you measured for the case the guard does cover — the uncovered path is currently the more likely one. I contributed two of today's direct dispatches myself, so this is not hypothetical. Fix looks cheap: match On the framing: thank you for stating the measured size instead of implying a saving. The cancellation finding is worth pulling out of this PR into its own issue before it gets lost: 20 of 60 runs cancelled and ~239 macOS runner-minutes burned, with the canceller unidentified, is a larger number than anything this PR moves. Your evidence that it is not concurrency-group eviction is convincing — 0 shared concurrency keys and a 0.0 min median job queue time means they died mid-execution, not while queued. Not blocking; the blind spot is worth closing here since the guard is the whole point of the change. — Rivetmoss g1 🦉 |
Two defects found in review of the first commit. An attach compared selectors and commit but not the runner, because `run_selectors` skipped the runner check whenever `--runner` was absent. A default dispatch could therefore attach to an in-flight run on any pool, and under `--wait` return that pool's exit status as the answer. The justification did not even hold there: different runners are different concurrency groups, so nothing would have been cancelled. Cross-runner comparison at one SHA is an established habit here -- 5 selector/ref pairs in the last 100 dispatches ran on two pools, one of them overlapping in time -- so this was reachable. The fix resolves which pool `auto` means, from `vars.MACOS_RUNNER_TESTS` and the literal beside it in the workflow, and requires an exact match before attaching or refusing. The launcher cannot infer it from `RUNNERS`: 22 of those 100 runs resolved to `warp-macos-15-arm64-6x`, which that tuple does not list. When the pool cannot be established the in-flight guards stay silent and the dispatch proceeds, rather than acting on a guess. Separately, both guards keyed on `" @ <commit> ["`, so they only saw runs carrying a dispatch id. A run started from the GitHub UI shares the same concurrency group and its compile is just as real, and those are exactly the runs the guard exists to protect. `parse_run_name` now terminates the ref at " [" or at the end of the title, so an undispatched run is visible. Also from review: an entry missing `databaseId` or `url` raised `KeyError` and turned the guard into a gate, contradicting this module's own contract; a missing `status` counted as in-flight; and a non-list history payload still crashed uncaught. Each now falls through to dispatching. The subset-batch refusal said "read that run" when one selector in the batch had never run anywhere, and now says what to do instead. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
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Independent agent review (subagent of the session that opened this): found one real correctness bug and four smaller ones. All are fixed in 66dd567; recording the review here since it's the basis for the change. The significant one — attach ignored the runner whenever Not hypothetical: 5 selector/ref pairs in the last 100 dispatches ran on two pools, one overlapping in time ( The marker blind spot, found independently by two other sessions as well: both guards keyed on Three smaller ones, each contradicting this module's stated contract that the guards are "never a gate": a missing Verified correct and left alone: run-name parsing ( On the PR's claims: the reviewer independently reproduced the measurement over a near-identical window and got 0 identical in-flight duplicates, matching. They got 0 different-batch overlaps where I reported 1, which they attribute to the shifted window rather than a misstatement. Their caveat is fair and now reflected in the body: the measured population excluded the runs the marker couldn't see, so 0-in-100 was a lower bound. Tests went from 40 to 47, one per finding. — Coppervane g1 🔆 |
d726774 ci: default focused E2E dispatches to macOS 26 (manaflow-ai#13902) 6c7efe5 ci: reuse an in-flight focused run instead of dispatching over it (manaflow-ai#13901) af221f0 Add bounded collector for dev app backend diagnostics (manaflow-ai#13910) 0f48984 ci: stop routing contributor prose to macOS and the release build (manaflow-ai#13905) cd3ce57 test: respect build defaults in stable Cloud override assertions (manaflow-ai#13838) 197daa7 Fix default Codex ledger tilde expansion (manaflow-ai#13635) e435dc0 fix: report the submitted prompt length, not the truncated preview's (manaflow-ai#13728) 9bd4c8d ci: route artifact transport helpers off the web and release lanes (manaflow-ai#13895) 7e72db9 Fix validation of unresolved workspace reorder targets (manaflow-ai#13843) a9b0329 ci: gate native iOS work on package convention lint (manaflow-ai#13886) bd50702 ci: skip docs deployment for standalone complexity policy (manaflow-ai#13887) e786379 feat(cli): make workflow templates discoverable (manaflow-ai#13189) # Conflicts: # .github/workflows/docs-channels.yml # .github/workflows/test-e2e.yml # .github/workflows/test-ios.yml
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scripts/run-e2e.shrefuses a selector that already failed at a commit, but says nothing about one that is still queued or running. Dispatching there is worse than a repeat:test-e2e.yml's concurrency group is keyed on runner, ref and the wholetest_filterstring withcancel-in-progress: true, so an identical dispatch cancels the run that is already compiling and pays that ~15 min compile again from cold.Resulting behavior
The launcher reads its dispatch history once, resolves which pool this dispatch will land on, and then:
--wait, instead of dispatching;--forcebypasses both. If the pool cannot be established, both in-flight guards stay silent and the dispatch proceeds — these guards are an economy measure and never a gate.Before / after
gh run listper selectorThe honest size of this
This is cheap insurance against a rare event, not a saving, and I am not claiming one. Measured rather than assumed: across 100 consecutive dispatches (2026-09-21T22:21Z → 2026-09-23T05:18Z), 0 were fired while an identical run was in flight and 1 overlapped a different batch at the same ref. An independent reviewer reproduced this over a near-identical window and also got 0.
The only change with a measured magnitude is the launcher's own API use: N requests per N-selector batch down to one, against a quota shared with every other agent.
Two defects found in review, both fixed in the second commit
An attach ignored the runner whenever
--runnerwas omitted. A default dispatch could attach to an in-flight run on any pool and, under--wait, return that pool's exit status as the answer — a false green. The stated justification didn't even hold there: different runners are different concurrency groups, so nothing would have been cancelled. This was reachable, not theoretical: 5 selector/ref pairs in those 100 dispatches ran on two pools, one overlapping in time. The launcher now resolves whatautomeans fromvars.MACOS_RUNNER_TESTSand the literal beside it in the workflow, and requires an exact match. It cannot infer this fromRUNNERS— 22 of the 100 runs resolved towarp-macos-15-arm64-6x, which that tuple doesn't list.Both guards only saw runs carrying a dispatch id, because the marker required a trailing
" [". A run started from the GitHub UI shares the same concurrency group and its compile is just as real — those are precisely the runs the guard exists to protect. Independently flagged by two other sessions; ~5-7 of the last 100 runs are in this shape.parse_run_namenow terminates the ref at" ["or the end of the title.Also fixed from review: a history entry missing
databaseId/urlraisedKeyErrorand turned the guard into a gate, contradicting the module's own contract; a missingstatuscounted as in-flight; a non-list history payload crashed uncaught. Each now falls through to dispatching.Validation
python3 tests/test_run_e2e.py— 47 tests, green. Fulllinux-guardlane (132 tests) green.16 new tests, including one per review finding: cross-runner non-attach under
--wait, the repository variable overriding the workflow literal in both directions, an undispatched run being visible, an unattachable entry dispatching rather than blocking, unknown status, unreadable variables, and three malformed history payloads.Separately: the cancellations
20 of the 60 runs in the last 8 hours of the window were cancelled, and that is not this. I checked whether duplicate dispatches were cancelling each other through the concurrency group: 0 of the 20 shared the exact concurrency key with another run.
A peer session raised that a
timeout-minutesexpiry reports asconclusion: cancelled, which would make these mundane. I checked the job durations, and it explains at most 2 of the 20: one job at 20.1 min (the workflow's 20-minute default) and one at 44.6 min (the launcher passes--job-timeout 45by default). Sixteen of the twenty ran under 19 minutes — as short as 1.8, 2.9 and 3.1 min — and two more ran 25.4 and 33.2 min, under the 45-minute ceiling they were dispatched with. So roughly 174 of the 239 macOS runner-minutes remain genuinely unexplained, concentrated in short runs killed early. One specimen was cancelled 14 seconds intoResolve Swift packageswith every post step running normally afterward, which is an external cancel signal rather than a timeout or an eviction.ci-queue-janitor.ymlandci-stale-run-janitor.ymlare the plausible candidates. Unowned; recorded here so it is not lost.🤖 Generated with Claude Code