$ git clone -n https://src.fedoraproject.org/rpms/python-backrefs.git /var/lib/mock/f45-build-29719-640/root/chroot_tmpdir/scmroot/python-backrefs
Cloning into '/var/lib/mock/f45-build-29719-640/root/chroot_tmpdir/scmroot/python-backrefs'...
$ git fetch origin d97e2cf061d4c2112d8ae469915708171c6f8db3:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/python-backrefs
 * [new ref]         d97e2cf061d4c2112d8ae469915708171c6f8db3 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at d97e2cf Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild