From 2473784c8538aba6e1f9d581deaa09d13bb95fe5 Mon Sep 17 00:00:00 2001
From: Gavin Li <git@thegavinli.com>
Date: Mon, 5 Jan 2015 20:07:14 -0800
Subject: [PATCH] add interfaces parsing script

---
 install.sh | 103 +++++++++++++++++++++++++++++++++++++++++++++++++----
 1 file changed, 96 insertions(+), 7 deletions(-)

diff --git a/install.sh b/install.sh
index b784d51..532819c 100755
--- a/install.sh
+++ b/install.sh
@@ -74,6 +74,10 @@ log() {
 	echo "[$(date)]" "$@" >&2
 }
 
+extract_embedded_file() {
+	gawk -e '$0=="!!!!"{p=0};p;$0=="!!!!"n{p=1}' n="${1}" "${script_path}"
+}
+
 mask_to_prefix() {
 	local prefix=0 netmask=${1}
 	for octet in ${netmask//./ }; do
@@ -134,12 +138,8 @@ install_compat_package() {
 	EOF
 
 	mkdir -p ${workdir}/usr/bin/
-	cat > ${workdir}/usr/bin/parse-debian-interfaces <<-EOF
-		#!/bin/bash
-		set -eu
-		set -o pipefail
-		echo ENIENIENIENI > /dev/kmsg
-	EOF
+	extract_embedded_file parse-debian-interfaces > \
+		${workdir}/usr/bin/parse-debian-interfaces
 	chmod 0755 ${workdir}/usr/bin/parse-debian-interfaces
 
 	( cd ${workdir} && bsdtar -cf compat.pkg.tar * )
@@ -418,6 +418,10 @@ postbootstrap_configuration() {
 		rm /archroot/etc/shadow.new
 	)
 
+	# copy interfaces file
+	mkdir -p /archroot/etc/network/
+	cp /etc/network/interfaces /archroot/etc/network/interfaces
+
 	# set up internet network
 	local eni=/etc/network/interfaces
 	{
@@ -673,7 +677,92 @@ elif [ "${script_path}" = "/installer/script.sh" ]; then
 else
 	installer_main "$@"
 fi
-exit 0 # in case junk appended
+exit 0
+
+: <<EMBED
+!!!!parse-debian-interfaces
+#!/usr/bin/gawk -bf
+
+function iface_setprop(prop, val,   suffix) {
+	suffix = iface_family == "inet6" ? 6 : 4
+	interfaces[iface_name][prop suffix] = val
+}
+
+function iface_getprop(prop, suffix) {
+	return interfaces[iface_name][prop suffix]
+}
+
+function iface_dump(suffix, fn,   addr, pfx, dnss) {
+	addr = iface_getprop("address", suffix)
+	pfx = iface_getprop("netmask", suffix)
+	if (addr && pfx)
+		print "Address=" addr "/" pfx > fn
+	else
+		return
+	addr = iface_getprop("gateway", suffix)
+	if (addr)
+		print "Gateway=" addr > fn
+	split(iface_getprop("dns", suffix), dnss, "|")
+	for (i = 1; i in dnss; i++)
+		print "DNS=" dnss[i] > fn
+}
+
+function netmask_to_prefix(mask,   cmps, bit, pfx) {
+	if (mask ~ /\./) {
+		pfx = 0
+		split(mask, cmps, ".")
+		do {
+			bit = and(cmps[rshift(pfx, 3) + 1],
+					  lshift(1, 7 - and(pfx, 7)))
+		} while (bit && ++pfx < 32)
+	} else {
+		pfx = mask
+	}
+	return pfx
+}
+
+BEGIN {
+	netdir = "/run/systemd/network"
+	if (system("mkdir -p " netdir) != 0)
+		exit 1
+}
+
+$1 == "iface" {
+	iface_name = $2
+	iface_family = $3
+	iface_type = $4
+	active = (iface_type == "static") &&
+	         (iface_family == "inet" || iface_family == "inet6")
+}
+
+active && ($1 ~ /^(address|netmask|gateway)$/) {
+	($1 == "netmask") && ($2 = netmask_to_prefix($2))
+	iface_setprop($1, $2)
+}
+
+active && $1 == "dns-nameservers" {
+	joined = ""
+	for (i = 2; $i; i++)
+		joined = joined ? joined "|" $i : $i
+	iface_setprop("dns", joined)
+}
+
+END {
+	for (iface_name in interfaces) {
+		fn = netdir "/" iface_name ".network"
+		print "# Generated by parse-debian-interfaces" > fn
+		print "" > fn
+		print "[Match]" > fn
+		print "Name=" iface_name > fn
+		print "" > fn
+		print "[Network]" > fn
+		iface_dump(4, fn)
+		iface_dump(6, fn)
+		close(fn)
+	}
+}
+!!!!
+EMBED
 
 #################
 # END OF SCRIPT #