$ git clone -n https://src.fedoraproject.org/rpms/saphire.git /var/lib/mock/f45-build-35568-696/root/chroot_tmpdir/scmroot/saphire
Cloning into '/var/lib/mock/f45-build-35568-696/root/chroot_tmpdir/scmroot/saphire'...
$ git fetch origin 6b67ed3a67b754da2279cc68ea6962a81f8dbfca:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/saphire
 * [new ref]         6b67ed3a67b754da2279cc68ea6962a81f8dbfca -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 6b67ed3 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild