feat: cut CI cost with an asymmetric OS/Python matrix and draft-PR skip - #264
feat: cut CI cost with an asymmetric OS/Python matrix and draft-PR skip#264hasansezertasan wants to merge 3 commits into
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The generated `ci` job ran the entire tox `env_list` (Python 3.10-3.14 plus `style`/`cli`) on all three OSes — 15 heavy runs per push, plus three redundant `style` runs. Cross-platform bugs are interpreter-independent and interpreter bugs are OS-independent, so the cross product is largely redundant spend. The `ci` matrix becomes an explicit `include:` list carrying a `tox_args` field: `ubuntu-latest` keeps the full `env_list`, macOS and Windows run `-e py` (the single env for the `.python-version` interpreter `setup-python` installs). Every OS still runs the suite and every interpreter still runs the suite; only the pairing is dropped (15 runs to 5 + 1 + 1). Under `include_c_extensions` all three cells render the full grid — a compiled extension makes each OS x interpreter pair a distinct ABI-specific build, which is why tox switches to `package = "sdist"` there. No new toggle: the carve-out is inferred. Draft PRs skip CI via `if: github.event.pull_request.draft != true` on every job — including `check`, because `alls-green` counts a skipped `needs` job as a failure and would otherwise turn every draft PR red; a skipped `check` leaves the required status pending instead. `ready_for_review` joins the `pull_request` `types:` (it is not a default type) so leaving draft re-runs the skipped CI. See ADR-028.
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📝 WalkthroughWalkthroughThe generated CI workflow now uses an asymmetric OS/Python matrix, restores the full matrix for C-extension builds, skips all jobs for draft pull requests, reruns when a pull request becomes ready, and adds rendered-workflow tests and documentation. ChangesCI Matrix and Draft Pull-Request Workflow
Estimated code review effort: 3 (Moderate) | ~20 minutes Merge Risk: 🟡 Moderate · up to The workflow change is otherwise bounded, but an added test docstring contains a Unicode character rejected by the repository's required lint rules, so CI can fail at the current head; merge should wait for that localized fix. The remaining concerns are minor test-quality follow-ups. Possibly related PRs
🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
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The draft-guard rationale claimed a skipped `check` leaves the required status **pending**. It does not: GitHub records a job skipped by a job-level `if:` as *success* for required-status-check purposes. Only a *workflow*-level skip (path or branch filters, `[skip ci]`) leaves a check unreported and therefore pending. The design is unchanged and still correct — gating `check` is what stops `alls-green` from counting the skipped `needs` jobs as a failure and painting every draft PR red. What changes is the documented consequence: a drafted PR ends up with a green, non-blocking `check` rather than a pending one. That is harmless — a draft cannot be merged, and `ready_for_review` starts a fresh `check` run on the same head SHA that supersedes the skipped one, so the authoritative status once the PR is reviewable always comes from a real run. Corrected in the generated workflow comment, ADR-028, the `CLAUDE.md` invariant, `docs/template-architecture.md`, and the test docstring.
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Inline comments:
In `@tests/test_render_validity.py`:
- Around line 335-338: Update the docstring of
test_c_extensions_restores_the_full_grid to replace the ambiguous Unicode
multiplication sign with an unambiguous ASCII equivalent, preserving the
documented OS/interpreter pairing meaning and satisfying Ruff RUF002.
- Around line 349-362: Update test_every_ci_job_is_gated_on_draft_prs to assert
the complete expected if expressions for the sonar and check jobs, including the
composed draft guard, existing fork condition, and always() condition joined
with &&; retain the per-job draft-gating assertion.
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CLAUDE.mdREADME.mddocs/adr/028-asymmetric-ci-matrix-and-draft-pr-skip.mddocs/template-architecture.mdtemplate/.github/workflows/ci.yml.jinjatests/test_golden_files/ci_worker_integration_redis.yml.txttests/test_render_validity.py
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…`sonar`/`check` jobs
1 participant
Closes #159.
What
Cuts the generated project's CI bill two ways: the
cijob stops running the full Python matrix on every OS, and no job runs at all while a PR is a draft. No change to the test suite itself.Approach (ADR-028)
The
cimatrix becomes an explicitinclude:list carrying atox_argsfield that the test step passes through:tox_argsubuntu-latest""env_list— 3.10-3.14,style,climacos-latest-e py.python-versioninterpreter onlywindows-latest-e py.python-versioninterpreter onlyEvery OS still runs the suite and every interpreter still runs the suite — only the cross product is dropped (15 heavy runs →
5 + 1 + 1), and the OS-independentstyle/clienvs now run once instead of three times.-e pyinherits[tool.tox.env_run_base]unchanged (samecoverage run --module pytest, samepackage = "wheel").include_c_extensionsis the one carve-out: a compiled extension makes each OS × interpreter pair a distinct ABI-specific build (which is why tox already switches topackage = "sdist"there), so all three cells rendertox_args: ""— the old full grid. Noci_full_matrixtoggle — the one class of project that needs the grid already declares itself through an existing answer.Coverage is unaffected: the
fail_under = 99gate lives incoverage-combineover the union of all cells (ADR-026), and the Linux cell still contributes every interpreter.Two corrections to the issue's sketch
The issue's scope note assumed gating individual jobs was safe. It isn't, and both fixes are load-bearing:
checkmust be gated too.re-actors/alls-greencounts a skippedneedsjob as a failure unless it's inallowed-skips, so gating the work jobs while lettingcheckrun would turn every draft PR red. Skippingcheckas well leaves the required status pending — the right state for a draft, which can't be merged anyway.ready_for_reviewmust be added totypes:. It is not in the default set (opened,synchronize,reopened), so without it a PR opened as a draft would skip CI and then never re-run it — the skip would be permanent, not deferred.!= true(not== false) keeps the guard falsy-safe onpush/workflow_dispatch, where there is nopull_requestcontext.sonarkeeps its fork guard andcheckitsalways(), each combined with the draft guard via&&.Changes
template/.github/workflows/ci.yml.jinja: asymmetric matrix +include_c_extensionsfull-grid branch,tox_argspassthrough, draft guard on all 9 jobs,ready_for_reviewtrigger typedocs/adr/028-asymmetric-ci-matrix-and-draft-pr-skip.md: new ADRtests/test_render_validity.py: 4 tests — the exact asymmetricinclude:list, the c-extensions fallback, the draft guard on every job (withsonar/check's prior conditions preserved), theready_for_reviewtypetests/test_golden_files/ci_worker_integration_redis.yml.txt: regenerated (one addedif:line)CLAUDE.md(workflow-index row + a new load-bearing invariant on the all-or-nothing draft guard),docs/template-architecture.md,README.mdVerification
mise run test— 122 render tests pass-e pyverified in a rendered project, not assumed:tox config -e pyresolvesbase_pythonto the invoking interpreter and inheritsenv_run_base; a realtox run -e pypasses (64 passed, 1 deselected)prek run actionlint zizmor ghalint --all-filesall pass (actionlint validates thematrix.tox_argsreference; zizmor clean under the regular persona)include_c_extensions=truerender is the full gridprek run --all-filesclean on every file this PR touchesOut of scope
The other PR-triggered generated workflows (
docs-preview.yml, thecheck-*guards) still run on drafts, and this repo's owntemplate-ci.ymlkeeps its current matrix. Both are separate follow-ups.