fix(ci): overlay the right line's refs for a PR on a feature branch - #4460
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Navigate logical layers of code changes, visualize relationships, and explore their blast radius. 📝 WalkthroughWalkthroughThe pull-request workflow now selects an artifact reference based on the base branch and uses it for artifact pulls and failure reporting. Tests verify the reference selection for main, release, stacked, feature, and unknown branches. ChangesArtifact reference selection
Priority: ⬇️ Low Estimated code review effort: 2 (Simple) | ~12 minutes Change: Bug fix Suggested reviewers: Merge Risk: 🟡 Moderate · up to A stacked PR can be tested against images from the wrong release line. Exclude descendant release refs before merging. 🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
Full details: Docstring CoverageExplanation Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 1 functions across 1 files. (1 skipped: 1 unsupported.)
✨ Finishing Touches 💡 1📝 Generate docstrings 💡
🧪 Generate unit tests (beta)
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Aleksei Sviridkin (lexfrei)
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The base-branch overlay pulled cozystack-packages:<base_ref>. A stacked PR's base is a feature branch such as fix/foo: the slash is not valid in an OCI tag and no artifact is published for it, so the pull failed, the step only warned, and every package the PR did not rebuild ran its committed release ref. With a committed ref older than its chart, that broke E2E (Grafana plugin 404). main and release-X.Y still read their own artifact. Any other base reads the artifact of whichever of main and the release lines it has the fewest commits on top of. Always picking main would put main's images under a release line's charts for a stack rooted on that line, the cross-generation mix that fails install. Assisted-by: LLM Signed-off-by: Aleksei Sviridkin <[email protected]>
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Inline comments:
In @.github/workflows/pull-requests.yaml:
- Around line 658-664: In the release-ref loop that compares distances from
BASE_REF, skip a release ref only when origin/${BASE_REF} is its strict
ancestor; keep independently advanced refs eligible without requiring the
release tip to be an ancestor of BASE_REF. Perform this check before calculating
n and updating ARTIFACT_REF.
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.github/workflows/pull-requests.yamlhack/overlay-main-images_test.bats
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IvanHunters
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IvanHunters
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LGTM.
This fixes #4391: a stacked PR's base name carries a /, which is not a valid OCI tag, so the base-branch pull fails and the E2E run silently overlays stale committed refs. The common paths stay correct, and the new bats test drives the actual workflow script (the run: body is awk-extracted from pull-requests.yaml) rather than a copy that could drift.
What I checked by running it, not only by reading:
base=mainandbase=release-1.6still short-circuit toARTIFACT_REF=BASE_REF, so those paths are unchanged.- With
fetch-depth: 0the finalize checkout fetches+refs/heads/*:refs/remotes/origin/*, soorigin/main,origin/release-*andorigin/${BASE_REF}are all present. The heuristic is not inert in CI. - Reverting the line-selection body makes
stack/xresolve tomainand the new test fails as it should, so the test actually discriminates the behavior. bats hack/overlay-main-images_test.batsis green (24/24), andbats-unit-testspicks the file up, so the Unit & controller tests job runs it.
Two non-blocking notes are inline.
Findings
- [MINOR]
.github/workflows/pull-requests.yaml:663, Tie-break to main can pick the wrong artifact for a stack on a freshly cut release line
- [NIT]
.github/workflows/pull-requests.yaml:647, Comment justifying the tie-break is imprecise
| for line in $(git for-each-ref --format='%(refname:lstrip=3)' 'refs/remotes/origin/release-*' \ | ||
| | grep -E '^release-[0-9]+\.[0-9]+$'); do | ||
| n="$(git rev-list --count "origin/${line}..origin/${BASE_REF}")" | ||
| if [ "$n" -lt "$best" ]; then best="$n"; ARTIFACT_REF="$line"; fi |
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[MINOR] Tie-break to main can pick the wrong artifact for a stack on a freshly cut release line
git rev-list --count origin/LINE..origin/BASE_REF measures only how far the base is ahead of a candidate, not how far the candidate's own tip has moved. When a release line is cut from main with no commit of its own yet, but main has since advanced, a stack based on that line ties at main and the tie goes to main, so the step overlays cozystack-packages:main.
Reproduced against this head in an isolated repo: release-1.7 cut at main's commit C (0 own commits), stack/bp two commits on its tip, main 51 commits ahead. BASE_REF=stack/bp then pulls oci://.../cozystack-packages:main, even though stack/bp descends directly from release-1.7 (distance 0). That is the "a stack on a release line reads main's generation" case this test's own comment says must not happen, and for that input it is worse than the pre-PR fallback, which kept the line's committed refs.
A symmetric distance (also count origin/BASE_REF..origin/LINE) or preferring any release-* the base is a descendant of over main would resolve it. Narrow window and CI-fidelity only, hence non-blocking.
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IvanHunters Confirmed: on a fresh line the tie goes to main, and for that input it is worse than before this PR. I'll fix it in a follow-up PR so the approved head here stays as is. On a tie it will pick the candidate the base is fewer commits behind. That picks the line in your repro and still picks main for a branch cut from main after the line.
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IvanHunters Correction to my reply above: I'm not doing the behind-count tie-break. A branch forked from main before the cut ties the same way, and main usually moves further than the line takes backports, so that branch would get the line's images. A line with no commits of its own is main at the cut commit in the graph, so no rule based on ancestry alone gets both cases right. I'm keeping the tie on main and fixing the comment in #4469.
| # artifact of whichever of main and the lines it has the fewest commits on | ||
| # top of. A tie goes to main, so a stack on a line keeps that line's | ||
| # generation only once the line has a commit of its own: a line fresh off | ||
| # main is topologically the same as main at that commit. |
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[NIT] Comment justifying the tie-break is imprecise
"a line fresh off main is topologically the same as main at that commit" holds for the fork point, but the tag cozystack-packages:main tracks main's tip, not the fork commit. Once main advances, the two artifacts no longer have the same content, which is the root of the tie-break note above.
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IvanHunters cozystack-packages:main follows main's tip, so the comment stops being true as soon as main moves past the fork point. The same follow-up rewrites it.
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What this PR does
A PR stacked on a feature branch now overlays the image refs of the line it grew from, so its E2E no longer falls back to the refs committed in the tree.
The Finalize job pulls
cozystack-packages:<base branch>and overlays its image refs onto the packages the PR did not rebuild. For a stacked PR the base is something likefix/foo. The slash is not valid in an OCI tag, and no workflow publishes an artifact for that branch anyway. So the pull failed, the step only printed a warning, and every unbuilt package ran its committed release ref. That is how stacked PRs got the Grafana plugin 404 described in #4391.Now
mainandrelease-X.Ybases read their own artifact. Any other base reads the artifact of whichever of main and the release lines it has the fewest commits on top of, and a notice says which one. A stack on a release line keeps that line's images, for example #3895, which sits onrelease-1.5. On a tie main wins, so a stack on a line cut from main reads main's artifact until the stack contains a commit of the line's own. Always taking main there would put main's images under the line's charts, and that is the install failure from #3437. The new bats case builds a small git fixture and checks the tag pulled for six bases, one of them a deleted branch.The other half of #4391, the stale
grafana-dashboards.tag, is a release-managed digest pin and is not touched here. It gets re-stamped at release prep.Part of #4391
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