Merge "Add element to run DHCP on all network interfaces."

This commit is contained in:
Jenkins 2013-04-04 01:58:08 +00:00 committed by Gerrit Code Review
commit 2ea0430acb
4 changed files with 70 additions and 0 deletions

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Autodetect network interfaces during boot and configure them for DHCP
The rationale for this is that we are likely to require multiple
network interfaces for use cases such as baremetal and there is no way
to know ahead of time which one is which, so we will simply run a
DHCP client on all interfaces (except lo) that are visible on the first
boot.
The script /usr/local/sbin/generate-interfaces-file.sh will be called
early in each boot and will scan available network interfaces and
ensure they are all present in /etc/network/interfaces.
Note that this element is only expected to be useful on Debian-derived
distributions, currently.

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#!/bin/sh -x
# Prepare the target system for regenerating /etc/network/interfaces
# on its first boot.
SCRIPTDIR=$(dirname $0)
install -D -g root -o root -m 0755 ${SCRIPTDIR}/generate-interfaces-file.sh /usr/local/sbin/generate-interfaces-file.sh
install -D -g root -o root -m 0755 ${SCRIPTDIR}/dhcp-all-interfaces.conf /etc/init/dhcp-all-interfaces.conf

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# Call a script to generate an /etc/network/interfaces file to DHCP all available interfaces
# Then remove this config file so the script is never run again
description "DHCP any connected, but unconfigured network interfaces"
start on starting network-interface
task
exec /usr/local/sbin/generate-interfaces-file.sh

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#!/bin/bash
# Generate $INTERFACES_FILE on first boot
# This will add any unconfigured network interfaces to /etc/network/interfaces
# and configure them for DHCP
INTERFACES_FILE="/etc/network/interfaces"
function get_if_link() {
cat /sys/class/net/${1}/carrier
}
for interface in $(ls /sys/class/net | grep -v ^lo$) ; do
echo -n "Inspecting interface: $interface..."
HAS_CONFIG=$(ifquery $interface >/dev/null 2>&1)
if [ "$HAS_CONFIG" == "" ]; then
ip link set dev $interface up >/dev/null 2>&1
HAS_LINK="$(get_if_link $interface)"
TRIES=3
while [ "$HAS_LINK" == "0" -a $TRIES -gt 0 ]; do
HAS_LINK="$(get_if_link $interface)"
if [ "$HAS_LINK" == "1" ]; then
break
else
sleep 1
fi
TRIES=$(( TRIES - 1 ))
done
if [ "$HAS_LINK" == "1" ] ; then
printf "auto $interface\r\niface $interface inet dhcp\r\n\r\n" >>$INTERFACES_FILE]
echo "Configured"
else
echo "No link detected, skipping"
fi
fi
done