zhan7236 opened a new pull request, #36924:
URL: https://github.com/apache/beam/pull/36924
The `beam-linkage-check.sh` script fails to restore the original git
position when starting from a detached HEAD state. This commonly happens when
verifying someone else's PR, which involves merging two non-branch references.
**Root Cause:**
The script used `git rev-parse --abbrev-ref HEAD` which returns the string
"HEAD" in detached state instead of a valid reference. The cleanup function
then fails to restore the original position.
**Fix:**
- Use `git rev-parse HEAD` to get the full commit SHA instead of branch name
- Add `-c advice.detachedHead=false` to suppress warnings during cleanup
checkout
Fixes #20558
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