$ git clone -n https://src.fedoraproject.org/rpms/quarter.git /var/lib/mock/f45-build-34200-680/root/chroot_tmpdir/scmroot/quarter
Cloning into '/var/lib/mock/f45-build-34200-680/root/chroot_tmpdir/scmroot/quarter'...
$ git fetch origin e989f1a5526f70810e2ca55f31034885292cfa6e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/quarter
 * [new ref]         e989f1a5526f70810e2ca55f31034885292cfa6e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e989f1a Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild