$ git clone -n https://src.fedoraproject.org/rpms/rust-scx_layered.git /var/lib/mock/f40-build-781174-131438/root/chroot_tmpdir/scmroot/rust-scx_layered
Cloning into '/var/lib/mock/f40-build-781174-131438/root/chroot_tmpdir/scmroot/rust-scx_layered'...
$ git fetch origin c6c949c569672a4861604d6324e90d78337670ec:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-scx_layered
 * [new ref]         c6c949c569672a4861604d6324e90d78337670ec -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c6c949c Update to 0.0.6