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[CI] Delete the Actions caches of closed pull requests - #406
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Ewerton Scaboro da Silva (ewertons) merged 2 commits intoOct 10, 2026
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A closed pull request's caches serve nothing but count against the 10 GB quota until unused for 7 days. ci-c-yocto saves ~450 MB of sstate per run that built something, so they could evict main's entry. - On close: delete that pull request's caches (same-repository only; a fork's token is read-only). - Nightly and manual sweep: delete the caches of every closed pull request. Covers forks, entries saved after close, and older pull requests. Manual runs can dry-run.
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Ewerton Scaboro da Silva (ewertons)
October 10, 2026 06:53
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🟡 Changes recommended
The on-close job fails whenever the pull request has no caches.
1 open finding
What changed in this PR
Adds automated cleanup of GitHub Actions caches belonging to closed pull requests.
Changes:
- Deletes same-repository PR caches upon closure.
- Adds nightly/manual sweeps with dry-run support.
| File | Description |
|---|---|
.github/workflows/cleanup-pr-caches.yml |
Defines cache cleanup triggers and jobs. |
🧠 Review effort: Balanced
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gh cache list --json returns an empty array with exit status 0 when a ref has no caches, whatever the gh version.
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October 10, 2026 07:00
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Ewerton Scaboro da Silva (ewertons)
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October 10, 2026 07:11
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Add this suggestion to a batch that can be applied as a single commit.This suggestion is invalid because no changes were made to the code.Suggestions cannot be applied while the pull request is closed.Suggestions cannot be applied while viewing a subset of changes.Only one suggestion per line can be applied in a batch.Add this suggestion to a batch that can be applied as a single commit.Applying suggestions on deleted lines is not supported.You must change the existing code in this line in order to create a valid suggestion.Outdated suggestions cannot be applied.This suggestion has been applied or marked resolved.Suggestions cannot be applied from pending reviews.Suggestions cannot be applied on multi-line comments.Suggestions cannot be applied while the pull request is queued to merge.Suggestion cannot be applied right now. Please check back later.
A closed pull request's caches (
refs/pull/<n>/merge) serve nothing but count against the 10 GB cache quota until unused for 7 days.ci-c-yoctosaves ~450 MB of sstate per run that built something, so they can evictmain's entry, which every pull request restores.New workflow
cleanup-pr-caches:pull_request: closed): deletes that pull request's caches. Same-repository pull requests only; a fork's token is read-only.dry-runinput.pull_request_targetis not used: zizmor rates it high (dangerous-triggers), and the sweep covers forks.Verified locally
lint-workflows: no findings.gh cache delete --all --ref <ref> --succeed-on-no-cacheson a ref without caches exits 0.Not verified: a real deletion. The on-close job first runs when this pull request closes.