$ git clone -n https://src.fedoraproject.org/rpms/luajit.git /var/lib/mock/f38-build-718621-96745/root/chroot_tmpdir/scmroot/luajit
Cloning into '/var/lib/mock/f38-build-718621-96745/root/chroot_tmpdir/scmroot/luajit'...
$ git fetch origin fce916bdf25de24bb6046c858a6115485ad299cb:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/luajit
 * [new ref]         fce916bdf25de24bb6046c858a6115485ad299cb -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at fce916b Update to latest luajit v2.1 git version