#!/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 $2 } ')"
eth_mac="$(ip link show $eth_dev | tr -s '[:space:]' '\n' | sed -n '/link\/ether/{n;p}')"

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/

# Disable dhcp on the bound physical interface, and all the internal interfaces
for devname in $eth_dev br-eth1 br-ex eth1-br-proxy ex-br-proxy \
               proxy-br-eth1 proxy-br-ex ovs-system; do
    install -D -m 644 /proc/self/fd/0 <<EOF /etc/systemd/network/00-disable-$devname-config.network
[Match]
Name=$devname
EOF
done

# restart networkd so it understands to not bring up these interfaces
systemctl restart systemd-networkd.service

# 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

# Create our external bridge
# Bind our external device to the bridge
# Tell the bridge that it has the mac address of the external device now
ovs-vsctl \
    -- add-br br-eth0 \
    -- add-port br-eth0 $eth_dev \
    -- set bridge br-eth0 other-config:hwaddr=$eth_mac

# restart networkd again so it will DHCP on the Open vSwitch device that
# replaces our external interface, but with the mac address of the external
# interface, so it ought to get the same address back
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
systemctl restart systemd-networkd.service


# Add the rest of the bridges
ovs-vsctl \
    -- add-br br-eth1 \
    -- add-port br-eth1 eth1-br-proxy \
    -- set interface eth1-br-proxy type=patch options:peer=proxy-br-eth1 \
    -- add-port br-eth0 proxy-br-eth1 \
    -- set interface proxy-br-eth1 type=patch options:peer=eth1-br-proxy \
    -- add-br br-ex \
    -- add-port br-ex ex-br-proxy \
    -- set interface ex-br-proxy type=patch options:peer=proxy-br-ex \
    -- add-port br-eth0 proxy-br-ex \
    -- set interface proxy-br-ex type=patch options:peer=ex-br-proxy

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