#!/bin/bash

echo -c 'config qemu network with xen bridge for '
echo $*

logger -- "$0 $*"

# Initialise a dummy MAC address. We choose the numerically
# largest non-broadcast address to prevent the address getting
# stolen by an Ethernet bridge for STP purposes.
# (FE:FF:FF:FF:FF:FF)
ip link set $1 address fe:ff:ff:ff:ff:ff || true

ifconfig $1 0.0.0.0 up

# If the bridge is in format brX.Y, strip Y from the bridge
# and use it as VLAN tag. (following code works only in BASH)
vif=$1
bridge=$2
if [[ $bridge =~ \.[[:digit:]]{1,4}$ ]]; then
    tag=$(echo ${bridge} | cut -d "." -f 2)
    bridge=$(echo ${bridge} | cut -d "." -f 1)
fi

if [ -z $tag ]; then
    ovs-vsctl -- --may-exist add-port ${bridge} ${vif}
else
    ovs-vsctl -- --may-exist add-port ${bridge} ${vif} tag=${tag}
fi