$ git clone -n https://src.fedoraproject.org/rpms/kf6-kdesu.git /var/lib/mock/f40-build-788155-135049/root/chroot_tmpdir/scmroot/kf6-kdesu
Cloning into '/var/lib/mock/f40-build-788155-135049/root/chroot_tmpdir/scmroot/kf6-kdesu'...
$ git fetch origin 894f57543f62bb82550baac229e548b6dd7d9d44:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/kf6-kdesu
 * [new ref]         894f57543f62bb82550baac229e548b6dd7d9d44 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 894f575 6.0.0