$ git clone -n https://src.fedoraproject.org/rpms/neon-backgrounds.git /var/lib/mock/f40-build-2299242-56610/root/chroot_tmpdir/scmroot/neon-backgrounds
Cloning into '/var/lib/mock/f40-build-2299242-56610/root/chroot_tmpdir/scmroot/neon-backgrounds'...
$ git fetch origin b58f0cb1a787a03bc44f9b98bf4c83d53297e9b5:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/neon-backgrounds
 * [new ref]         b58f0cb1a787a03bc44f9b98bf4c83d53297e9b5 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b58f0cb Rebuilt for https://fedoraproject.org/wiki/Fedora_40_Mass_Rebuild