$ git clone -n https://src.fedoraproject.org/rpms/lammps.git /var/lib/mock/f41-build-858757-168473/root/chroot_tmpdir/scmroot/lammps
Cloning into '/var/lib/mock/f41-build-858757-168473/root/chroot_tmpdir/scmroot/lammps'...
$ git fetch origin 6ec61acd47c3fdbc71dc6338c3f3f224a129c4dc:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/lammps
 * [new ref]         6ec61acd47c3fdbc71dc6338c3f3f224a129c4dc -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 6ec61ac Merge branch 'f40' into f41