$ git clone -n https://src.fedoraproject.org/rpms/kf6-kparts.git /var/lib/mock/f42-build-side-1-3573594-46768/root/chroot_tmpdir/scmroot/kf6-kparts
Cloning into '/var/lib/mock/f42-build-side-1-3573594-46768/root/chroot_tmpdir/scmroot/kf6-kparts'...
$ git fetch origin 223eecacab6bebdfbabe028a3a60208f17cc7b0a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/kf6-kparts
 * [new ref]         223eecacab6bebdfbabe028a3a60208f17cc7b0a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 223eeca 6.15 and plasma 3.4 compatibility rebuild