diskimage-builder/elements/dhcp-all-interfaces/install.d/dhcp-all-interfaces.sh
Gregory Haynes 6bdb810f38 Handle unconfigured interfaces for dhcp-all-ifaces
On ubuntu, if an interface exists but is unconfigured then ifquery
$iface will return 0 but no output. This will cause dhcp-all-interfaces
to not attempt to dhcp on that interface.

Change-Id: Ic1532728ae9ca6d759714392f727d25b814ef336
2016-03-23 06:00:49 +00:00

107 lines
2.6 KiB
Bash
Executable File

#!/bin/bash
if [ ${DIB_DEBUG_TRACE:-0} -gt 0 ]; then
set -x
fi
set -eu
set -o pipefail
INTERFACE=${1:-} #optional, if not specified configure all available interfaces
ENI_FILE="/etc/network/interfaces"
PATH=/sbin:$PATH
if [ -d "/etc/network" ]; then
CONF_TYPE="eni"
elif [ -d "/etc/sysconfig/network-scripts/" ]; then
CONF_TYPE="netscripts"
else
echo "Unsupported network configuration type!"
exit 1
fi
ARGS="$0 $@"
function serialize_me() {
if [ "$CONF_TYPE" == "eni" ]; then
# Serialize runs so that we don't miss hot-add interfaces
FLOCKED=${FLOCKED:-}
if [ -z "$FLOCKED" ] ; then
FLOCKED=true exec flock -x $ENI_FILE $ARGS
fi
fi
}
function get_if_link() {
cat /sys/class/net/${1}/carrier
}
function enable_interface() {
local interface=$1
serialize_me
if [ "$CONF_TYPE" == "eni" ]; then
printf "auto $interface\niface $interface inet dhcp\n\n" >>$ENI_FILE
elif [ "$CONF_TYPE" == "netscripts" ]; then
printf "DEVICE=\"$interface\"\nBOOTPROTO=\"dhcp\"\nONBOOT=\"yes\"\nTYPE=\"Ethernet\"" >"/etc/sysconfig/network-scripts/ifcfg-$interface"
fi
echo "Configured $1"
}
function config_exists() {
local interface=$1
if [ "$CONF_TYPE" == "netscripts" ]; then
if [ -f "/etc/sysconfig/network-scripts/ifcfg-$interface" ]; then
return 0
fi
else
if ifquery $interface >/dev/null 2>&1; then
if [ -z "$(ifquery $interface 2>&1)" ]; then
return 1
else
return 0
fi
else
return 1
fi
fi
return 1
}
function inspect_interface() {
local interface=$1
local mac_addr_type
mac_addr_type=$(cat /sys/class/net/${interface}/addr_assign_type)
echo -n "Inspecting interface: $interface..."
if config_exists $interface; then
echo "Has config, skipping."
elif [ "$mac_addr_type" != "0" ]; then
echo "Device has generated MAC, skipping."
else
ip link set dev $interface up &>/dev/null
local has_link
local tries
for ((tries = 0; tries < 20; tries++)); do
has_link=$(get_if_link $interface)
[ "$has_link" == "1" ] && break
sleep 1
done
if [ "$has_link" == "1" ]; then
enable_interface "$interface"
else
echo "No link detected, skipping"
fi
fi
}
if [ -n "$INTERFACE" ]; then
inspect_interface $INTERFACE
else
for iface in $(ls /sys/class/net | grep -v ^lo$); do
inspect_interface $iface
done
fi