$ git clone -n https://src.fedoraproject.org/rpms/luajit.git /var/lib/mock/f39-build-2517351-61728/root/chroot_tmpdir/scmroot/luajit
Cloning into '/var/lib/mock/f39-build-2517351-61728/root/chroot_tmpdir/scmroot/luajit'...
$ git fetch origin 3ba0d112d9093da42f6535bf59d037612c1dcffe:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/luajit
 * [new ref]         3ba0d112d9093da42f6535bf59d037612c1dcffe -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 3ba0d11 Add support for s390x