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

build

@@ -4,9 +4,10 @@ arch=x86_64
 extra_targets=''
 qemu_sdl='--enable-sdl --with-sdlabi=2.0'
 j="$(($(nproc) - 2))"
+post_script_args=''
 x11=false
 v=0
-while getopts 'a:e:j:nSt:v' OPT; do
+while getopts 'a:j:p:St:v' OPT; do
   case "$OPT" in
     a)
       arch="$OPTARG"
@@ -14,6 +15,9 @@ while getopts 'a:e:j:nSt:v' OPT; do
     j)
       j="$OPTARG"
     ;;
+    p)
+      post_script_args="$OPTARG"
+    ;;
     S)
       qemu_sdl=''
     ;;
@@ -28,6 +32,7 @@ while getopts 'a:e:j:nSt:v' OPT; do
     ;;
   esac
 done
+shift $(($OPTIND - 1))
 case "$arch" in
   x86_64)
     defconfig=qemu_x86_64_defconfig
@@ -41,6 +46,7 @@ case "$arch" in
     # qemu_arm_vexpress_defconfig required a newer QEMU than 2.0.0 on a Ubuntu host.
     # so let's stick to versatile for now.
     defconfig=qemu_arm_versatile_defconfig
+    post_script_args="$post_script_args -n"
   ;;
   aarch64)
     defconfig=qemu_aarch64_virt_defconfig
@@ -85,6 +91,7 @@ time \
   make \
   O="$outdir" \
   BR2_JLEVEL="$j" \
+  BR2_ROOTFS_POST_SCRIPT_ARGS="$post_script_args" \
   HOST_QEMU_OPTS="--enable-debug --extra-cflags='-DDEBUG_PL061=1' --enable-trace-backends=simple $qemu_sdl" \
   V="$v" \
   kernel_module-rebuild \

init.md

@@ -31,13 +31,13 @@ Also remember that if your init returns, the kernel will panic, there are just t
 - run forever in a loop or long sleep
 - `poweroff` the machine
 
-### BusyBox init is fine, but networking timeout gets on my nerves
+### Disable networking
 
-I know, right?
+The default BusyBox init scripts enable networking, and there is a 15 second timeout in case your network is down or if your kernel / emulator setup does not support it.
 
-Add this line to `rootfs_post_build_script`:
+To disable networking, use:
 
-    rm -f "${1}/etc/init.d/"S*network
+    ./build -p -n
 
 To restore it, run:
 

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