$ git clone -n https://src.fedoraproject.org/rpms/rubygem-glu.git /var/lib/mock/f39-test-2570171-62238/root/chroot_tmpdir/scmroot/rubygem-glu
Cloning into '/var/lib/mock/f39-test-2570171-62238/root/chroot_tmpdir/scmroot/rubygem-glu'...
$ git fetch origin d84c8fcaa8a307052c7994e2953f5d8426065455:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rubygem-glu
 * [new ref]         d84c8fcaa8a307052c7994e2953f5d8426065455 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at d84c8fc Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild