$ git clone -n https://src.fedoraproject.org/rpms/mate-backgrounds.git /var/lib/mock/f40-build-2296976-56427/root/chroot_tmpdir/scmroot/mate-backgrounds
Cloning into '/var/lib/mock/f40-build-2296976-56427/root/chroot_tmpdir/scmroot/mate-backgrounds'...
$ git fetch origin c0509a5c4f5aa4e791579c962de837712f1460e0:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/mate-backgrounds
 * [new ref]         c0509a5c4f5aa4e791579c962de837712f1460e0 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c0509a5 Rebuilt for https://fedoraproject.org/wiki/Fedora_40_Mass_Rebuild