#!/bin/bash
#============================================================================
# /etc/xen/scripts/vlan-bridge
#
# Script for configuring a vif in bridged mode, supporting vlans.
# The hotplugging system will call this script if it is specified either in
# the device configuration given to Xend, or the default Xend configuration
# in /etc/xen/xend-config.sxp.
#
# Usage:
# vlan-bridge (add|remove|online|offline)
#
# Environment vars:
# vif         vif interface name (required).
# XENBUS_PATH path to this device's details in the XenStore (required).
#
# Read from the store:
# bridge  bridge to add the vif to (optional).  Defaults to searching for the
#         bridge itself.
# ip      list of IP networks for the vif, space-separated (optional).
#
# up:
# Adds a vlan if required, then a bridge with the real network interface,
# migrating the IP address. Then adds the vif to the bridge.
#
# down:
# Removes the vif interface from the bridge. Removes the bridge
# and migrates the IP address back to the real interface, if bridge is
# otherwise empty.
#
# warning: If the real network interface is a bond device, adding
# a new vlan may cause the current active slave interface to become
# disabled. Try stopping haldaemon and/or avahi-daemon.

#============================================================================

PATH=/usr/bin:/bin:/usr/sbin:/sbin

dir=$(dirname "$0")
. "$dir/vif-common.sh"
. "$dir/xen-network-common.sh"
. "$dir/vlan-bridge-common.sh"

set +e
export LANG=C LC_ALL=C

bridge=$(xenstore_read_default "$XENBUS_PATH/bridge" "$bridge")

if [ -z "$bridge" ]; then
	bridge=$(brctl show | awk 'FNR == 2 { print $1 }')
	[ -n "$bridge" ] ||
		fatal "Could not find bridge, and none was specified"
fi

bridge="${bridge//[^0-9]/}"

case "$command" in
	online)
		vlanadd $bridge $vif
		;;
	offline)
		vlandel $bridge $vif
		;;
esac

log debug "Successful vif-bridge $command for $vif, bridge $bridge."
if [ "$command" == "online" ]
then
  success
fi