$ git clone -n https://src.fedoraproject.org/rpms/freefem++.git /var/lib/mock/f40-build-2236909-53526/root/chroot_tmpdir/scmroot/freefem++
Cloning into '/var/lib/mock/f40-build-2236909-53526/root/chroot_tmpdir/scmroot/freefem++'...
$ git fetch origin 4cd07036f49fb1e8402d05ca6640a86f9d9606e3:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/freefem++
 * [new ref]         4cd07036f49fb1e8402d05ca6640a86f9d9606e3 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 4cd0703 Set OMP_NUM_THREADS 4