$ git clone -n https://src.fedoraproject.org/rpms/cairomm1.16.git /var/lib/mock/f45-build-4425-332/root/chroot_tmpdir/scmroot/cairomm1.16
Cloning into '/var/lib/mock/f45-build-4425-332/root/chroot_tmpdir/scmroot/cairomm1.16'...
$ git fetch origin 1caf4d28256552de784ad35874358453338de1a5:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/cairomm1.16
 * [new ref]         1caf4d28256552de784ad35874358453338de1a5 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 1caf4d2 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild