$ git clone -n https://src.fedoraproject.org/rpms/catimg.git /var/lib/mock/f45-build-3884-329/root/chroot_tmpdir/scmroot/catimg
Cloning into '/var/lib/mock/f45-build-3884-329/root/chroot_tmpdir/scmroot/catimg'...
$ git fetch origin 771ae84a3577ef7551b9d9bbfd5a9262f238a138:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/catimg
 * [new ref]         771ae84a3577ef7551b9d9bbfd5a9262f238a138 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 771ae84 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild