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#!/bin/sh
#
# Copyright (C) 2014 Codethink Limited
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; version 2 of the License.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License along
# with this program; if not, write to the Free Software Foundation, Inc.,
# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.

set -xe

# Get the first ethernet driver and its ip
eth_dev="$(ip addr | perl -pe 'if (/^\d+: ([^:]+)/) { $iface=$1; } if (m@^\s*inet ([^/]+)/@) { print "$iface $1\n"; } $_=undef;' | grep "^e" | head -1 | awk '{ print $1 } ')"
eth_ip="$(ip addr | perl -pe 'if (/^\d+: ([^:]+)/) { $iface=$1; } if (m@^\s*inet ([^/]+)/@) { print "$iface $1\n"; } $_=undef;' | grep "^e" | head -1 | awk '{ print $2 } ')"

ip link add proxy-br-eth1 type veth peer name eth1-br-proxy
ip link add proxy-br-ex type veth peer name ex-br-proxy

if [ -f /var/openstack/openvswitch-one-node-setup ]; then
  exit 0
fi

# Create the bridges to use the External network mapped
# This configuration is for 1 node and it was taken from:
# https://fosskb.wordpress.com/2014/10/18/openstack-juno-on-ubuntu-14-10/
# and https://fosskb.wordpress.com/2014/06/10/managing-openstack-internaldataexternal-network-in-one-interface/


ovs-vsctl add-br br-eth0
ovs-vsctl add-port br-eth0 $eth_dev
ifconfig br-eth0 $eth_ip up
ip link set br-eth0 promisc on
# Deallocate ip address for external interface so we don't try to route
# connections out of an interface that no longer works
ip addr del $eth_ip dev $eth_dev
ovs-vsctl add-br br-eth1
ovs-vsctl add-br br-ex
ovs-vsctl add-port br-eth1 eth1-br-proxy
ovs-vsctl add-port br-ex ex-br-proxy
ovs-vsctl add-port br-eth0 proxy-br-eth1
ovs-vsctl add-port br-eth0 proxy-br-ex
ip link set eth1-br-proxy up promisc on
ip link set ex-br-proxy up promisc on
ip link set proxy-br-eth1 up promisc on
ip link set proxy-br-ex up promisc on

# Disable dhcp on the ethernet device we've bound into Open vSwitch
install -D -m 644 /proc/self/fd/0 <<EOF /etc/systemd/network/00-disable-$eth_dev-config.network
[Match]
Name=$eth_dev
EOF

# DHCP on the Open vSwitch device
install -D -m 644 /proc/self/fd/0 <<EOF /etc/systemd/network/10-br-ex-dhcp.network
[Match]
Name=br-eth0

[Network]
DHCP=yes
EOF

install -D -m 644 /proc/self/fd/0 <<'EOF' /var/openstack/openvswitch-one-node-setup
Openvswitch one node setup: success
EOF

exit 0