From cb91ab1abbaeb94ddb69c9050640e48546e55068 Mon Sep 17 00:00:00 2001
From: Vincent Knecht <vincent.knecht@mailoo.org>
Date: Tue, 16 Feb 2016 21:44:21 +0100
Subject: Add support for static network configuration.

---
 README.md         | 27 +++++++++++++++++++++++++++
 rpi2-gen-image.sh | 35 ++++++++++++++++++++++++++++++++++-
 2 files changed, 61 insertions(+), 1 deletion(-)

diff --git a/README.md b/README.md
index fddf17d..0fb8a67 100644
--- a/README.md
+++ b/README.md
@@ -40,6 +40,33 @@ Set default system locale and keyboard layout. This setting can also be changed
 ##### `TIMEZONE`="Europe/Berlin"
 Set default system timezone. All available timezones can be found in the `/usr/share/zoneinfo/` directory. This setting can also be changed inside the running OS using the `dpkg-reconfigure tzdata` command.
 
+#### Networking settings
+These settings are used to set up networking configuration in `/etc/systemd/network/eth.network`.
+
+#####`ENABLE_DHCP`=true
+Set the system to use DHCP. When set to "true", the following `NET_*` settings (used for static configuration) are ignored.
+
+#####`NET_ADDRESS`=""
+Set a static IPv4 or IPv6 address and its prefix, separated by "/", eg. "192.169.0.3/24".
+
+#####`NET_GATEWAY`=""
+Set the IP address for the default gateway.
+
+#####`NET_DNS_1`=""
+Set the IP address for the first DNS server.
+
+#####`NET_DNS_2`=""
+Set the IP address for the second DNS server.
+
+#####`NET_DNS_DOMAINS`=""
+Set the default DNS search domains to use for non fully qualified host names.
+
+#####`NET_NTP_1`=""
+Set the IP address for the first NTP server.
+
+#####`NET_NTP_2`=""
+Set the IP address for the second NTP server.
+
 #### Basic system features:
 ##### `ENABLE_CONSOLE`=true
 Enable serial console interface. Recommended if no monitor or keyboard is connected to the RPi2. In case of problems fe. if the network (auto) configuration failed - the serial console can be used to access the system.
diff --git a/rpi2-gen-image.sh b/rpi2-gen-image.sh
index 3c80bf3..012d4ca 100755
--- a/rpi2-gen-image.sh
+++ b/rpi2-gen-image.sh
@@ -46,6 +46,18 @@ PASSWORD=${PASSWORD:=raspberry}
 DEFLOCAL=${DEFLOCAL:="en_US.UTF-8"}
 TIMEZONE=${TIMEZONE:="Europe/Berlin"}
 
+# Network settings
+ENABLE_DHCP=${ENABLE_DHCP:=true}
+# NET_* settings are ignored when ENABLE_DHCP=true
+# NET_ADDRESS is an IPv4 or IPv6 address and its prefix, separated by "/"
+NET_ADDRESS=${NET_ADDRESS:=""}
+NET_GATEWAY=${NET_GATEWAY:=""}
+NET_DNS_1=${NET_DNS_1:=""}
+NET_DNS_2=${NET_DNS_2:=""}
+NET_DNS_DOMAINS=${NET_DNS_DOMAINS:=""}
+NET_NTP_1=${NET_NTP_1:=""}
+NET_NTP_2=${NET_NTP_2:=""}
+
 # APT settings
 APT_PROXY=${APT_PROXY:=""}
 APT_SERVER=${APT_SERVER:="ftp.debian.org"}
@@ -272,6 +284,10 @@ cat <<EOM >$R/etc/hosts
 127.0.0.1       localhost
 127.0.1.1       ${HOSTNAME}
 EOM
+if [ "$NET_ADDRESS" != "" ] ; then
+NET_IP=$(echo ${NET_ADDRESS} | cut -f 1 -d'/')
+sed -i "s/^127.0.1.1/${NET_IP}/" $R/etc/hosts
+fi
 
 # Set up IPv6 hosts
 if [ "$ENABLE_IPV6" = true ] ; then
@@ -289,6 +305,7 @@ cat <<EOM >$R/etc/network/interfaces
 # please configure your networks in '/etc/systemd/network/'
 EOM
 
+if [ "$ENABLE_DHCP" = true ] ; then
 # Enable systemd-networkd DHCP configuration for interface eth0
 cat <<EOM >$R/etc/systemd/network/eth.network
 [Match]
@@ -300,7 +317,23 @@ EOM
 
 # Set DHCP configuration to IPv4 only
 if [ "$ENABLE_IPV6" = false ] ; then
-  sed -i "s/=yes/=v4/" $R/etc/systemd/network/eth.network
+  sed -i "s/^DHCP=yes/DHCP=v4/" $R/etc/systemd/network/eth.network
+fi
+else # ENABLE_DHCP=false
+cat <<EOM >$R/etc/systemd/network/eth.network
+[Match]
+Name=eth0
+
+[Network]
+DHCP=no
+Address=${NET_ADDRESS}
+Gateway=${NET_GATEWAY}
+DNS=${NET_DNS_1}
+DNS=${NET_DNS_2}
+Domains=${NET_DNS_DOMAINS}
+NTP=${NET_NTP_1}
+NTP=${NET_NTP_2}
+EOM
 fi
 
 # Enable systemd-networkd service
-- 
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