ci(nix): let the build job finish, and name the stage that fails - #429
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… failure Two things the first runs on main showed, neither of which is about the derivation. cancel-in-progress killed every run before it finished. The job takes half an hour and main takes merges minutes apart, so each merge evicted the one before it: 21m38s, 25s, 7m05s, all cancelled, and the run that finally reported did so only because the merges happened to stop overnight. A cancelled run is not a failure either, so nothing went red while the workflow reported nothing at all. That reading is what the concurrency key was already half-fixed for -- separating the schedule from pushes -- and push-versus-push is the same mechanism, missed at the time. Queueing costs at most one pending run, since GitHub keeps a single pending entry per group and replaces it. And the failure annotation named the wrong component. Every run so far has died inside `record`, with export never executing, while the message read "the compositor addon is packaged but the export path does not work" -- an accusation aimed at the one thing the run had not reached, and the addon is precisely what this step exists to vouch for. Track whether record ever produced a project, and say which stage actually failed. The reason is already in the scratch file the run writes, so surface it rather than leaving it there. Co-Authored-By: Claude <noreply@anthropic.com>
…ic flag The bound added to get-sources turned an indefinite hang into a named failure, which is where the question starts rather than ends. On a headless runner `openscreen sources` gets an answer within 20s four times in five, while `record` -- the same call, the same options -- exceeds 30s on all three attempts, and the log has nothing to say about the difference beyond which side of the threshold each landed on. A duration on both paths is what separates "slow here, fast there" from "never returns here", and neither a threshold nor a stack trace can. Gated on the flag that already exists, so a normal run is unchanged; main-process console is rerouted to stderr in CLI mode, so it lands beside the milestones. Co-Authored-By: Claude <noreply@anthropic.com>
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In @.github/workflows/nix-build.yml:
- Around line 46-54: Update the concurrency comment near cancel-in-progress to
remove the claim that every merge gets a workflow result and accurately state
that GitHub retains only the latest pending run when newer pushes replace
earlier pending runs. Leave the cancel-in-progress setting unchanged.
In `@electron/ipc/handlers.ts`:
- Around line 1735-1741: Update the catch handling around
desktopCapturer.getSources to distinguish deadline timeouts from other rejection
errors: use “gave up after” only for the timeout error, and otherwise log a
rejection-specific diagnostic that includes the actual error message. Preserve
rethrowing the original error after diagnostic logging.
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… timeout Both from the review, and the first is a factual error of mine. "Every merge eventually gets an answer" is not what cancel-in-progress: false buys. GitHub holds one pending entry per group and a newer push replaces it, so merges landing while a run is in flight still go unbuilt. What the setting buys is that a run which has started finishes -- the affordable half, and the one that was missing. Verifying every merge would need a queue this workflow does not have, and is not worth it for a half-hour drift check. And the diagnostic logged "gave up after Nms" for anything the catch saw, including a getSources that rejected on its own well inside the deadline. For a commit whose whole purpose is to say what happened, asserting a timeout that did not occur points the next reader at the wrong thing. Log the error instead; the deadline error already carries its own wording. Co-Authored-By: Claude <noreply@anthropic.com>
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…ilures The measurement added in #429 was there to compare the sources path against record's, and the first run carrying it printed only record's: the grep sat inside a failure branch, so the successful side -- the interesting half -- went into a scratch file and stayed there. The durations had to be reconstructed from log timestamps instead, which is exactly the guessing the instrumentation was meant to replace. Move both greps ahead of the branching, so a success reports its duration too. On the record side that matters more than on sources: a record that works is the one measurement this path has never produced. Also fold the sources capture into 2>&1 like record and export. The probe at the top of the step established that this host's xvfb-run merges stderr into stdout, so the separate .err file could never hold anything, and every reader that went looking for output in it found an empty file and drew the wrong conclusion. What the reconstruction already shows, for whoever reads this next: enumeration here is bimodal, not slow. Successes land at 377-491ms including Electron start; failures do not return at all and are cut by whichever bound applies -- 20s in the sources runner, 30s in the shared handler. There is no middle, so no threshold to tune, which is worth knowing before anyone tries. Co-Authored-By: Claude <noreply@anthropic.com>
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What this does
Follow-up to #419, from what its first runs on
mainactually reported. Nothing here touches the derivation — the build is green and stays green.A started run could not finish.
cancel-in-progresskilled every run before it reported: 21m38s, 25s, 7m05s, all cancelled, each evicted by the next merge. A half-hour job against a branch that takes merges minutes apart cannot survive that, and a cancelled run is not a failure, so the branch showed nothing while the workflow reported nothing. #419 half-fixed this by keying the group onevent_nameso the schedule and pushes stop colliding; push-versus-push is the same mechanism and I missed it.To be precise about what
cancel-in-progress: falsebuys, since an earlier draft of this overclaimed: a run that has started now finishes. It does not mean every merge is verified — GitHub holds one pending entry per group and a newer push replaces it, so merges landing mid-run still go unbuilt. That is the affordable half, and the one that was missing. Verifying each merge needs a queue this workflow does not have, and is not worth it for a drift check.The failure annotation named the wrong component. Every run so far dies inside
record, with export never executing:and the message read "the compositor addon is packaged but the export path does not work" — aimed at the one thing the run had not reached, and the addon is precisely what the step exists to vouch for. It now tracks whether
recordever produced a project and says which stage failed, surfacing the reason the run already writes to a scratch file.A duration, so the open question can be answered. The bound #419 added turned an indefinite hang into a named failure, which is where the question starts rather than ends:
openscreen sourcesgets an answer within 20s four times in five, whilerecord— same call, same options — exceeds 30s on all three attempts. The log has nothing to say about that difference beyond which side of the threshold each landed on.get-sourcesnow logs how long it took and, on failure, the actual error rather than an assumed timeout. Gated on the existingOPENSCREEN_DIAGNOSTICflag, so a normal run is unchanged.Where this leaves the open problem
Unchanged and undiagnosed: capture is unreliable on the GitHub runner, and
recordin particular does not get its source list. This adds the measurement that would distinguish "slow here, fast there" from "never returns here"; it does not attempt a fix, because there is nothing yet to base one on.For the record, the last run before #419 landed failed the same way with
rc=124— killed by the outer bound at 120s with no reason given. So the failure is not new; only the fact that the log now names it is.One thing worth flagging: the 30s bound in
get-sourcesis itself unvalidated. It converted a hang into a named failure, but ifrecordgenuinely needs 45s on a slow runner then that bound is what fails it. The duration added here is what would settle that, on data rather than on my estimate.Verified
npx vitest --run: 1749 passed, 0 failed.npx tsc --noEmitandbiome check: clean on the changed file. Workflow YAML parses and every embeddedrunblock passesbash -n.Not verified: no
nix buildfrom here — no nix on this machine. The changes are the workflow's control flow and one gated log line, neither of which the derivation depends on.🤖 Generated with Claude Code
Summary by CodeRabbit
Bug Fixes
Improvements