$ git clone -n https://src.fedoraproject.org/rpms/minetest.git /var/lib/mock/f40-build-791776-137740/root/chroot_tmpdir/scmroot/minetest
Cloning into '/var/lib/mock/f40-build-791776-137740/root/chroot_tmpdir/scmroot/minetest'...
$ git fetch origin f8d79c4f3d78098b7020ecf042ef2626d79f856d:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/minetest
 * [new ref]         f8d79c4f3d78098b7020ecf042ef2626d79f856d -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f8d79c4 Fix FTBFS