$ git clone -n https://src.fedoraproject.org/rpms/lua.git /var/lib/mock/f41-build-side-110722-59078197-6570882/root/chroot_tmpdir/scmroot/lua
Cloning into '/var/lib/mock/f41-build-side-110722-59078197-6570882/root/chroot_tmpdir/scmroot/lua'...
$ git fetch origin f266b44f8f4972497ba33ae6df96852e4721d854:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/lua
 * [new ref]         f266b44f8f4972497ba33ae6df96852e4721d854 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f266b44 apply more complete upstream fix for bug3 (thanks to Xose Vazquez Perez)