added systemd-networkd extension module

2 files changed, 147 insertions, 0 deletions

diff --git a/builder/modules.d/systemd-networkd-ext/hooks/parse-kcl-for-networkd.sh b/builder/modules.d/systemd-networkd-ext/hooks/parse-kcl-for-networkd.sh
new file mode 100644
index 00000000..cdf080a3
--- /dev/null
+++ b/builder/modules.d/systemd-networkd-ext/hooks/parse-kcl-for-networkd.sh
@@ -0,0 +1,98 @@
+#!/bin/bash
+#
+# This script was mostly stolen from 40network/parse-ip-opts.sh.  Its
+# actions are adapted to write .network files to /etc/systemd/network
+# in the initramfs instead o
+
+command -v getarg >/dev/null || . /lib/dracut-lib.sh
+
+main_work() {
+	local IPCONF="$(getarg ip=)"
+	local BOOTIF="$(getarg BOOTIF=)"
+
+	if [ -z "${IPCONF}" ] && [ -z "${BOOTIF}" ]; then
+		# No ip= argument(s) given by PXE, TODO try dhcp 
+		return;
+	fi
+
+	# ip= is expected in following format (syslinux IPAPPEND3):
+	# <CLIENT_IP>:<PXE_SERVER_IP>:<GATEWAY_IP>:<NETMASK>
+	local CLIENT_IP=
+	local SERVER_IP=
+	local GATEWAY_IP=
+	local NETMASK=
+	read -r CLIENT_IP SERVER_IP GATEWAY_IP NETMASK <<< $( awk -F: '{print $1" "$2" "$3" "$4}' <<< "${IPCONF}" )
+
+	# BOOTIF= contains the MAC address of the boot interface
+	# and a hardware type prefix of length 2, e.g. "01-"
+	# So if BOOTIF has 20 chars, then we got the prefix.
+	# This needs to be stripped to get the MAC address only
+	[ -n "${BOOTIF}" ] && [ ${#BOOTIF} -eq 20 ] && BOOTIF="${BOOTIF#???}"
+	BOOTIF="$(tr '-' ':' <<< $BOOTIF)"
+
+	# TODO sanity checks
+  
+	# Taken from parse-ip-opts.sh
+	# Convert the netmask to CIDR notation
+	if [[ "x$NETMASK" =~ ^x[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}$ ]]; then
+		CIDR=$(mask2cidr "$NETMASK")
+	elif [ -n "$NETMASK" -a "x${NETMASK//[0-9]/}" = 'x' ]; then
+		# The mask is already a prefix length (uint), so validate it
+		[[ "x$CLIENT_IP" == x*:*:* && "$NETMASK" -le 128 || "$NETMASK" -le 32 ]] && CIDR=$NETMASK
+	fi
+
+
+	# Generate network and link file for networkd
+	NETWORK_FILE=/etc/systemd/network/01-boot-lan.network
+	mkdir -p $(dirname $NETWORK_FILE)
+	echo '[Match]' > $NETWORK_FILE
+	echo 'Name=bootnet' >> $NETWORK_FILE
+	# Hardcode bootnet as our boot interface
+	[ -n "$BOOTIF" ] && echo "MACAddress=$BOOTIF" >> $NETWORK_FILE
+	echo '[Network]' >> $NETWORK_FILE
+	echo 'Bridge=br0' >> $NETWORK_FILE
+
+	## Boot interface has 'bootnet' as dedicated name
+	LINK_FILE=/etc/systemd/network/00-boot-lan.link
+	echo '[Match]' > $LINK_FILE
+	[ -n "$BOOTIF" ] && echo "MACAddress=$BOOTIF" >> $LINK_FILE
+	echo '[Link]' >> $LINK_FILE
+	echo "Name=bootnet" >> $LINK_FILE
+
+	# HACK pro bridge setup
+	BRIDGE_DEV_CONF=/etc/systemd/network/10-bridge-lan.netdev
+	echo '[NetDev]' > $BRIDGE_DEV_CONF
+	echo 'Name=br0' >> $BRIDGE_DEV_CONF
+	echo 'Kind=bridge' >> $BRIDGE_DEV_CONF
+
+	BRIDGE_IF_CONF=/etc/systemd/network/11-bridge-lan.network
+	echo '[Match]' > $BRIDGE_IF_CONF
+	echo "Name=br0" >> $BRIDGE_IF_CONF
+	echo '[Network]' >> $BRIDGE_IF_CONF
+	[ -n "$CLIENT_IP" ] && echo "Address=${CLIENT_IP}/${CIDR:-24}" >> $BRIDGE_IF_CONF
+	[ -n "$GATEWAY_IP" ] && echo "Gateway=${GATEWAY_IP}" >> $BRIDGE_IF_CONF
+
+}
+# from parse-ip-opts.sh
+# Takes a netmask and outputs the corresponding CIDR
+# e.g.
+#   mask2cidr 255.255.255.0
+#   returns:  24
+function mask2cidr() {
+    local -i bits=0
+    for octet in ${1//./ }; do
+        for i in {0..8}; do
+            [ "$octet" -eq $(( 256 - (1 << i) )) ] && bits+=$((8-i)) && break
+        done
+        [ $i -eq 8 -a "$octet" -ne 0 ] && warn "Bad netmask $mask" && return
+        [ $i -gt 0 ] && break
+    done
+    echo $bits
+}
+
+main_work
+
+# HACK to wait for network during udev loop...
+touch /lib/dracut/need-initqueue
+/sbin/initqueue --finished /bin/busybox timeout -t 10 /lib/systemd/systemd-networkd-wait-online -i br0
+
diff --git a/builder/modules.d/systemd-networkd-ext/module-setup.sh b/builder/modules.d/systemd-networkd-ext/module-setup.sh
new file mode 100755
index 00000000..3b3aabd6
--- /dev/null
+++ b/builder/modules.d/systemd-networkd-ext/module-setup.sh
@@ -0,0 +1,49 @@
+#!/bin/bash
+
+# called by dracut
+check() {
+    if ! dracut_module_included "systemd-networkd"; then
+        derror "systemd-networkd-ext needs systemd-networkd in the initramfs"
+        return 1
+    fi
+
+    return 255
+}
+
+# called by dracut
+depends() {
+    echo "systemd-networkd"
+}
+
+installkernel() {
+    return 0
+}
+
+# called by dracut
+install() {
+		# need initqueue to get a clean network start
+		dracut_need_initqueue
+
+    inst_multiple -o \
+        $systemdutildir/systemd-networkd \
+        $systemdutildir/systemd-networkd-wait-online \
+        $systemdsystemunitdir/systemd-networkd-wait-online.service \
+        $systemdsystemunitdir/systemd-networkd.service \
+        $systemdsystemunitdir/systemd-networkd.socket \
+        networkctl ip
+
+    # the hook script that will parse the "ip=" kernel command line
+    # parameter and generate the .link and .network files needed
+    # by systemd-networkd.
+    inst_hook cmdline 10 "$moddir/hooks/parse-kcl-for-networkd.sh"
+    for i in \
+        systemd-networkd-wait-online.service \
+            systemd-networkd.service \
+            systemd-networkd.socket
+    do
+        systemctl --root "$initdir" enable "$i"
+    done
+    # HACK: disables udev new persitent naming scheme
+    rm $systemdutildir/network/99-default.link
+}
+