$ git clone -n https://src.fedoraproject.org/rpms/MUMPS.git /var/lib/mock/f40-build-763340-122473/root/chroot_tmpdir/scmroot/MUMPS
Cloning into '/var/lib/mock/f40-build-763340-122473/root/chroot_tmpdir/scmroot/MUMPS'...
$ git fetch origin 1521f7642a3a87b99d3c8b1f1cba1210a806a50f:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/MUMPS
 * [new ref]         1521f7642a3a87b99d3c8b1f1cba1210a806a50f -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 1521f76 Rebuild for Scotch-7.0.4