net::ifupdown: add sysvinit start script

Also add a minimal /etc/network/interfaces file, so that ifupdown is
happy when started.

Author: sixtyfourktec

recipes/net/ifupdown.yaml

@@ -1,4 +1,4 @@
-inherit: [cpackage, make, install]
+inherit: [cpackage, make, install, init]
 
 metaEnvironment:
     PKG_VERSION: "0.8.43"
@@ -33,5 +33,13 @@ buildScript: |
 
     mkdir -p install/etc/network/if-{pre-up.d,up.d,post-down.d,down.d}
 
+    # add minimal interfaces file
+    printf "auto lo\niface lo inet loopback\n" > install/etc/network/interfaces
+
+    # add init script
+    if isAnySysvinit; then
+        install -D -m 0755 $<@ifupdown/S40network.sh@> install/etc/init.d/S40network.sh
+    fi
+
 packageScript: |
     installPackageBin "$1/install/"

recipes/net/ifupdown/S40network.sh

@@ -0,0 +1,31 @@
+#!/bin/sh
+#
+# This file comes from buildroot and is licensed under GPLv2.
+#
+# Start the network....
+#
+
+# Debian ifupdown needs the /run/network lock directory
+mkdir -p /run/network
+
+case "$1" in
+  start)
+	printf "Starting network: "
+	/sbin/ifup -a
+	[ $? = 0 ] && echo "OK" || echo "FAIL"
+	;;
+  stop)
+	printf "Stopping network: "
+	/sbin/ifdown -a
+	[ $? = 0 ] && echo "OK" || echo "FAIL"
+	;;
+  restart|reload)
+	"$0" stop
+	"$0" start
+	;;
+  *)
+	echo "Usage: $0 {start|stop|restart}"
+	exit 1
+esac
+
+exit $?