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ci: cancel a PR's superseded test run when its head moves (#848) #933

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Merged
fujibee merged 1 commit into from
Aug 21, 2026
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ci: cancel a PR's superseded test run when its head moves (#848) #933

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12 changes: 12 additions & 0 deletions .github/workflows/tests.yml
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Expand Up @@ -54,6 +54,18 @@ on:
permissions:
contents: read

# A PR run whose head has moved is dead weight: its verdict can be used for
# nothing, and it keeps holding the runner slots -- four macOS shards per run,
# and the account runs at most five macOS jobs at once (measured 2026-08-21:
# 35 runs that day, 140 macOS jobs, queue waits of 0-50 min, one PR's shard
# waiting 50 min behind runs whose heads had already been replaced). So a new
# run for the same PR cancels the one before it. A push to main is never
# cancelled: its group is its own run id, and that run is what a release reads
# (#848).
concurrency:
group: tests-${{ github.event_name == 'pull_request' && format('pr-{0}', github.event.pull_request.number) || github.run_id }}
cancel-in-progress: ${{ github.event_name == 'pull_request' }}

env:
# Number of parallel bats shards per OS. The matrix and the shard helper must
# stay in lockstep; the stable summary job below verifies that they do.
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