#!/bin/bash

#    Licensed under the Apache License, Version 2.0 (the "License"); you may
#    not use this file except in compliance with the License. You may obtain
#    a copy of the License at
#
#         http://www.apache.org/licenses/LICENSE-2.0
#
#    Unless required by applicable law or agreed to in writing, software
#    distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
#    WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
#    License for the specific language governing permissions and limitations
#    under the License.
#    Copyright (c) 2014 Huawei Technologies.

_NEUTRON_CONF_DIR="/etc/neutron"
_NEUTRON_CONF_FILE='neutron.conf'
_NEUTRON_INSTALL="/usr/lib64/python2.6/site-packages"
_NEUTRON_DIR="${_NEUTRON_INSTALL}/neutron"

# if you did not make changes to the installation files,
# please do not edit the following directories.
_CODE_DIR="../neutron/"
_BACKUP_DIR="${_NEUTRON_INSTALL}/.neutron-cascaded-openvswitch-agent-installation-backup"

#_SCRIPT_NAME="${0##*/}"
#_SCRIPT_LOGFILE="/var/log/neutron-cascaded-openvswitch-agent/installation/${_SCRIPT_NAME}.log"

if [[ ${EUID} -ne 0 ]]; then
    echo "Please run as root."
    exit 1
fi

##Redirecting output to logfile as well as stdout
#exec >  >(tee -a ${_SCRIPT_LOGFILE})
#exec 2> >(tee -a ${_SCRIPT_LOGFILE} >&2)

cd `dirname $0`

echo "checking installation directories..."
if [ ! -d "${_NEUTRON_DIR}" ] ; then
    echo "Could not find the neutron installation. Please check the variables in the beginning of the script."
    echo "aborted."
    exit 1
fi
if [ ! -f "${_NEUTRON_CONF_DIR}/${_NEUTRON_CONF_FILE}" ] ; then
    echo "Could not find neutron config file. Please check the variables in the beginning of the script."
    echo "aborted."
    exit 1
fi

echo "checking previous installation..."
if [ -d "${_BACKUP_DIR}/neutron" ] ; then
    echo "It seems neutron-cascaded-openvswitch-agent has already been installed!"
    echo "Please check README for solution if this is not true."
    exit 1
fi

echo "backing up current files that might be overwritten..."
mkdir -p "${_BACKUP_DIR}"
cp -r "${_NEUTRON_DIR}/" "${_BACKUP_DIR}/"
if [ $? -ne 0 ] ; then
    rm -r "${_BACKUP_DIR}/neutron"
    echo "Error in code backup, aborted."
    exit 1
fi

echo "copying in new files..."
cp -r "${_CODE_DIR}" `dirname ${_NEUTRON_DIR}`
if [ $? -ne 0 ] ; then
    echo "Error in copying, aborted."
    echo "Recovering original files..."
    cp -r "${_BACKUP_DIR}/neutron" `dirname ${_NEUTRON_DIR}` && rm -r "${_BACKUP_DIR}/neutron"
    if [ $? -ne 0 ] ; then
        echo "Recovering failed! Please install manually."
    fi
    exit 1
fi

echo "restarting cascaded neutron openvswitch agent..."
service openstack-neutron-openvswitch-agent restart
if [ $? -ne 0 ] ; then
    echo "There was an error in restarting the service, please restart cascade neutron openvswitch-agent manually."
    exit 1
fi

echo "Completed."
echo "See README to get started."

exit 0