Disable networking on image with command line option ./build -p -n

rootfs_post_build_script

@@ -1,2 +1,21 @@
 #!/usr/bin/env bash
-#rm "${1}/etc/init.d/"S*network
+# This is run as part of:
+#      make target-finalize
+# which gets called by the default target.
+# To test it out, arguments can be passed with:
+#     make BR2_ROOTFS_POST_SCRIPT_ARGS="asdf qwer"
+target_dir="$1"
+shift
+net=true
+while getopts 'n' OPT; do
+  case "$OPT" in
+    n)
+      echo asdfqwer
+      net=false
+    ;;
+  esac
+done
+shift $(($OPTIND - 1))
+if ! "$net"; then
+  rm -f "${target_dir}/etc/init.d/"S*network
+fi