$ git clone -n https://src.fedoraproject.org/rpms/rubygem-rr.git /var/lib/mock/f39-build-1499450-34744/root/chroot_tmpdir/scmroot/rubygem-rr
Cloning into '/var/lib/mock/f39-build-1499450-34744/root/chroot_tmpdir/scmroot/rubygem-rr'...
$ git fetch origin cf4029b2b0071c922ec2b1853f6660a2f80b1414:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rubygem-rr
 * [new ref]         cf4029b2b0071c922ec2b1853f6660a2f80b1414 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at cf4029b Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild