$ git clone -n https://src.fedoraproject.org/rpms/google-compute-engine-guest-configs.git /var/lib/mock/f45-build-12887-444/root/chroot_tmpdir/scmroot/google-compute-engine-guest-configs
Cloning into '/var/lib/mock/f45-build-12887-444/root/chroot_tmpdir/scmroot/google-compute-engine-guest-configs'...
$ git fetch origin 74267575cee283c085bf4f322d4704b77f75c85c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/google-compute-engine-guest-configs
 * [new ref]         74267575cee283c085bf4f322d4704b77f75c85c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 7426757 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild