$ git clone -n https://src.fedoraproject.org/rpms/kf6-kparts.git /var/lib/mock/f42-build-side-1-3585711-46907/root/chroot_tmpdir/scmroot/kf6-kparts
Cloning into '/var/lib/mock/f42-build-side-1-3585711-46907/root/chroot_tmpdir/scmroot/kf6-kparts'...
$ git fetch origin b6118954dbc814c8533599d22feb24809e2663b9:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/kf6-kparts
 * [new ref]         b6118954dbc814c8533599d22feb24809e2663b9 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b611895 6.16.0