$ git clone -n https://src.fedoraproject.org/rpms/foomatic.git /var/lib/mock/f45-build-9161-399/root/chroot_tmpdir/scmroot/foomatic
Cloning into '/var/lib/mock/f45-build-9161-399/root/chroot_tmpdir/scmroot/foomatic'...
$ git fetch origin 75e0146a26d84a48f4911775ef92c5c9296807d9:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/foomatic
 * [new ref]         75e0146a26d84a48f4911775ef92c5c9296807d9 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 75e0146 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild