add fuse_set_user_groups to client conf

update_conf.sh

@@ -6,4 +6,11 @@ for conf in $(find /ceph -name ceph.conf); do
     cp -a /ceph/ceph.conf "$conf"
 done
 
-rm /ceph/ceph.conf
+# this prevents log spam due to a missing feature when using fuse from within docker
+# https://tracker.ceph.com/issues/23446#note-2
+ceph_client_conf='/ceph/client/etc/ceph/ceph.conf'
+if [ -e "$ceph_client_conf" ]; then
+    echo '\tfuse_set_user_groups = false' >> "$ceph_client_conf"
+fi
+
+rm /ceph/ceph.conf