$ git clone -n https://src.fedoraproject.org/rpms/mfem.git /var/lib/mock/f42-build-864963-172682/root/chroot_tmpdir/scmroot/mfem
Cloning into '/var/lib/mock/f42-build-864963-172682/root/chroot_tmpdir/scmroot/mfem'...
$ git fetch origin 997fd63813a8eb4401bdaa47322c46ed8c491b5a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/mfem
 * [new ref]         997fd63813a8eb4401bdaa47322c46ed8c491b5a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 997fd63 Rebuild for MUMPS-5.7.3