$ git clone -n https://src.fedoraproject.org/rpms/f31-backgrounds.git /var/lib/mock/f41-build-749657-13378/root/chroot_tmpdir/scmroot/f31-backgrounds
Cloning into '/var/lib/mock/f41-build-749657-13378/root/chroot_tmpdir/scmroot/f31-backgrounds'...
$ git fetch origin dd687e96faa9829775a0b47c584dbc5a0ba01163:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/f31-backgrounds
 * [new ref]         dd687e96faa9829775a0b47c584dbc5a0ba01163 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at dd687e9 Rebuilt for https://fedoraproject.org/wiki/Fedora_40_Mass_Rebuild