$ git clone -n https://src.fedoraproject.org/rpms/desktop-backgrounds.git /var/lib/mock/f42-build-3282746-41399/root/chroot_tmpdir/scmroot/desktop-backgrounds
Cloning into '/var/lib/mock/f42-build-3282746-41399/root/chroot_tmpdir/scmroot/desktop-backgrounds'...
$ git fetch origin 14d53e51571391baac8f3aee7472d0e5840bdfcf:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/desktop-backgrounds
 * [new ref]         14d53e51571391baac8f3aee7472d0e5840bdfcf -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 14d53e5 correct license and migrate to SPDX