yjshen opened a new pull request #2272: Move checkout action to v2 URL: https://github.com/apache/bookkeeper/pull/2272 "fatal: reference is not a tree" is a known issue in actions/checkout#23 and fixed in checkout@v2, update checkout used in GitHub actions. The following three lines only "checkout pull request HEAD commit instead of merge commit" and made all commits available for the following actions. For Pulsar, there is a check for "doc only change" and compares the PR commit with the revision the PR is based, therefore git diff is used and needs the revision history visible. For BookKeeper, since git command is not using for the following steps now, these lines could be removed as well. ```yml with: fetch-depth: 0 ref: ${{ github.event.pull_request.head.sha }} ```
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