diskimage-builder/elements/dhcp-all-interfaces/install.d/generate-interfaces-file.sh

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#!/bin/bash
ENI_FILE="/etc/network/interfaces"
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
if [ "$CONF_TYPE" == "eni" ]; then
# Serialize runs so that we don't miss hot-add interfaces
FLOCK=${1:-}
if [ -z "$FLOCK" ] ; then
exec flock -x $ENI_FILE $0 flocked
fi
fi
function get_if_link() {
cat /sys/class/net/${1}/carrier
}
function enable_interface() {
local interface=$1
if [ "$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 disable_interface() {
local interface=$1
if [ "$CONF_TYPE" == "netscripts" ]; then
local IFCFG_FILE="/etc/sysconfig/network-scripts/ifcfg-$interface"
if [ -f "$IFCFG_FILE" ]; then
rm $IFCFG_FILE
else
echo "No link detected, skipping"
fi
else
echo "No link detected, skipping"
fi
}
for interface in $(ls /sys/class/net | grep -v ^lo$) ; do
echo -n "Inspecting interface: $interface..."
if ifquery $interface >/dev/null 2>&1 ; then
echo "Has config, skipping."
else
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
enable_interface "$interface"
else
disable_interface "$interface"
fi
fi
done