Emit warning when buck artifact is the latest

Change-Id: If01b47f2aaebf5cf2cf3977ad05e1453c4a2ef57

@@ -4,9 +4,13 @@
 # karaf using the supplied arguments.
 # -----------------------------------------------------------------------------
 
+. $ONOS_ROOT/tools/build/envDefaults
+if [ -L $ONOS_TAR ]; then
+  echo "WARN: This script does not support deploying buck artifacts"
+fi
+
 # FIXME: temporarily fix 500 error in GUI, need to be improved with a better way
 if echo $* | egrep "\bclean\b"; then
-    . $ONOS_ROOT/tools/build/envDefaults
     export KARAF_ROOT=${KARAF_ROOT:-~/Applications/apache-karaf-$KARAF_VERSION}
     export STAGE=$(dirname $KARAF_ROOT)
     echo "Removing data directories..."