$ git clone -n https://src.fedoraproject.org/rpms/cmpfit.git /var/lib/mock/f45-build-4558-332/root/chroot_tmpdir/scmroot/cmpfit
Cloning into '/var/lib/mock/f45-build-4558-332/root/chroot_tmpdir/scmroot/cmpfit'...
$ git fetch origin 210761f44478c28b5a7a601c41ecec55bc40a8b6:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/cmpfit
 * [new ref]         210761f44478c28b5a7a601c41ecec55bc40a8b6 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 210761f Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild