$ git clone -n https://src.fedoraproject.org/rpms/f23-backgrounds.git /var/lib/mock/f41-build-749652-13378/root/chroot_tmpdir/scmroot/f23-backgrounds
Cloning into '/var/lib/mock/f41-build-749652-13378/root/chroot_tmpdir/scmroot/f23-backgrounds'...
$ git fetch origin 1e042e65e208aae88a466c8ea5432ec74331d525:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/f23-backgrounds
 * [new ref]         1e042e65e208aae88a466c8ea5432ec74331d525 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 1e042e6 Rebuilt for https://fedoraproject.org/wiki/Fedora_40_Mass_Rebuild