ci: adopt platform tiers — fast merge-blocking set decides main's color; slow/port lanes post-merge; contributor precheck; unenrolled-test gate
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Assessment
- Difficulty
- 5/5
- Estimated time
- Over a week
- Newbie friendliness
- 35/100
- Issue type
- Feature
- Clarity
- Mostly clear
- Activity status
- Active
- Domain
- build-system, ci-cd, testing
Research direction
Start with the existing nightly workflow, CONTRIBUTING.md, and the tests/*.sh suite sections; compare the static gates described here with PR #1260. Done means Tier 1 determines main's status, slow and port lanes run post-merge, the contributor precheck is documented, and unenrolled tests fail.
Written by the indexing model from the issue text.
Description
Decision (Jon, 2026-09-22): follow what mature languages already do (Rust tiers + bors, CPython make patchcheck + unstable buildbots, Go TryBots + post-submit builders) rather than invent our own.
Why now. Main CI has not finished green since 2026-09-16 (f532c8d). The last 14 main runs are failure/cancelled; the dominant cause is one lane — macos / macos-15-intel runs on main pushes only and hits its 45-minute timeout, which GitHub reports as cancelled. 01e2b4a passed 6126/6126 and still did not go green. When red is normal on main, a real regression is invisible.
Scope.
- Tiers. Tier 1 (blocks merge, decides main's color): Linux gcc/clang, ASan+UBSan core, the core suite. Tier 2 (post-merge / nightly; failures open an issue, never color main): macos-15-intel and other slow or port lanes — measure which. The nightly workflow already exists.
- Contributor precheck (our
make patchcheck): one command, under ~30 s, running the static gates — pipefail verdicts, suite labels, child-exit accounting, section plan — documented in CONTRIBUTING.md. PR #1260 met these only after a 45-minute CI run. - Unenrolled-test gate. A
tests/*.shthat no suite section invokes must fail. Three exist today (test_amalgamation.sh,test_args_import.sh— being enrolled in #1260 — andtest_ci_portability.sh); nothing flags them, while a style rule in the same file fails loudly.
Merge queue (Rust's green-by-construction main) deferred until PR concurrency warrants it.
- Dominant language
- C
- Stars
- 3
- Forks
- 7
- Avg merge
- 3h 58m
- Merged PRs (30d)
- 105
Getting set up
Starts the project's dev container in your browser, under your own GitHub account.
- Ships a Dockerfile or Docker Compose file
- Has a pull request template
- Read the contributing guide
First steps
- Read the whole issue, then the project's contributing guide.
- Comment on the issue to say you are picking it up — it saves two people doing the same work.
- Fork the repository and make your change on a branch.
- Open a pull request that references the issue number.
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