In addition to -b (suppress builds) add -k (suppress kernel build) and

-w (suppress world).

tools/tools/nanobsd/nanobsd.sh

@@ -461,16 +461,30 @@ customize_cmd () {
 #
 #######################################################################
 
+usage () {
+	(
+	echo "Usage: $0 [-b/-k/-w] [-c config_file]"
+	echo "	-b	suppress builds (both kernel and world)"
+	echo "	-k	suppress buildkernel"
+	echo "	-w	suppress buildworld"
+	echo "	-c	specify config file"
+	) 1>&2
+	exit 2
+}
+
 #######################################################################
 # Parse arguments
 
-do_build=true
+do_kernel=true
+do_world=true
 
-args=`getopt bc:h $*`
+set +e
+args=`getopt bc:hkw $*`
 if [ $? -ne 0 ] ; then
-	echo "Usage: $0 [-c config file]" 1>&2
+	usage
 	exit 2
 fi
+set -e
 
 set -- $args
 for i
@@ -479,7 +493,12 @@ do
 	in
 	-b)
 		shift;
-		do_build=false
+		do_world=false
+		do_kernel=false
+		;;
+	-k)
+		shift;
+		do_kernel=false
 		;;
 	-c)
 		. "$2"
@@ -487,8 +506,11 @@ do
 		shift;
 		;;
 	-h)
-		echo "Usage: $0 [-b] [-c config file]"
-		exit 2
+		usage
+		;;
+	-w)
+		shift;
+		do_world=false
 		;;
 	--)
 		shift;
@@ -497,8 +519,8 @@ do
 done
 
 if [ $# -gt 0 ] ; then
-	echo "Extraneous arguments"
-	exit 2
+	echo "$0: Extraneous arguments supplied"
+	usage
 fi
 
 #######################################################################
@@ -547,13 +569,18 @@ export NANO_WORLDDIR
 #######################################################################
 # And then it is as simple as that...
 
-if $do_build ; then
+if $do_world ; then
 	clean_build
 	make_conf_build
 	build_world
+else
+	echo "## Skipping buildworld (as instructed)"
+fi
+
+if $do_kernel ; then
 	build_kernel
 else
-	echo "## Skipping build steps (as instructed)"
+	echo "## Skipping buildkernel (as instructed)"
 fi
 
 clean_world