$ git clone -n https://src.fedoraproject.org/rpms/lua.git /var/lib/mock/f43-build-side-114665-60947541-6586614/root/chroot_tmpdir/scmroot/lua
Cloning into '/var/lib/mock/f43-build-side-114665-60947541-6586614/root/chroot_tmpdir/scmroot/lua'...
$ git fetch origin 6ae7fe78e095f2219a318555ae9c748de1a8c957:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/lua
 * [new ref]         6ae7fe78e095f2219a318555ae9c748de1a8c957 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 6ae7fe7 5.4.8