$ git clone -n https://src.fedoraproject.org/rpms/kst.git /var/lib/mock/f41-build-811711-147509/root/chroot_tmpdir/scmroot/kst
Cloning into '/var/lib/mock/f41-build-811711-147509/root/chroot_tmpdir/scmroot/kst'...
$ git fetch origin 5cbb3159bc8a3a2ecab3f101352328a21654ff3a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/kst
 * [new ref]         5cbb3159bc8a3a2ecab3f101352328a21654ff3a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 5cbb315 matio rebuild