$ git clone -n https://src.fedoraproject.org/rpms/sane-backends.git /var/lib/mock/f40-build-795543-140206/root/chroot_tmpdir/scmroot/sane-backends
Cloning into '/var/lib/mock/f40-build-795543-140206/root/chroot_tmpdir/scmroot/sane-backends'...
$ git fetch origin aaf6bcca794e84a24aeb878517542fad7954bc02:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/sane-backends
 * [new ref]         aaf6bcca794e84a24aeb878517542fad7954bc02 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at aaf6bcc Rebuilt for https://fedoraproject.org/wiki/Fedora_40_Mass_Rebuild