CI: cancel a run that a newer push has superseded - #236
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main.yml runs on push and on pull_request with no concurrency block, so a second push to a branch leaves the first run going to answer a question about a tree nobody is waiting on. Over the last 90 days 49 of libs-back 357 runs were superseded while still running, 229 of 1736 wall-clock minutes. The group is the workflow and the ref, so runs on different branches and on master are unaffected by one another. libs-base carries the same block.
fredkiefer
approved these changes
Aug 11, 2026
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main.yml runs on push and on pull_request and has no concurrency block, so a second push to a branch leaves the first run going. It answers a question about a tree nobody is waiting on, and nothing cancels it.
Over the last 90 days 49 of libs-back's 357 workflow runs were superseded while still running, 229 of 1736 wall-clock minutes. Taken from the Actions API over that window, counting a run as superseded when a later run for the same workflow and ref started before it finished.
The group is the workflow and the ref, so a run on one branch never cancels a run on another, and a push to master never cancels a pull request. A superseded run reports as cancelled rather than as a failure.
libs-base carries the same block, added in gnustep/libs-base#746.