$ git clone -n https://src.fedoraproject.org/rpms/luajit.git /var/lib/mock/f41-build-850498-165462/root/chroot_tmpdir/scmroot/luajit
Cloning into '/var/lib/mock/f41-build-850498-165462/root/chroot_tmpdir/scmroot/luajit'...
$ git fetch origin cf2d0da41f3543fbd63f7a95f9d65348e30728f6:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/luajit
 * [new ref]         cf2d0da41f3543fbd63f7a95f9d65348e30728f6 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at cf2d0da Update to version 2.1.1720049189