#!/bin/bash

# Copyright 2018 The Openstack-Helm Authors.
#
# 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.

set -ex

COMMAND="${@:-start}"

function kernel_modules () {
  chroot /mnt/host-rootfs modprobe dummy
}

function test_vip () {
  ip addr show ${interface} | \
    awk "/inet / && /${interface}/{print \$2 }" | \
    awk -F '/' '{ print $1 }' | \
    grep -q "${addr%/*}"
}

function start () {
  ip link show ${interface} > /dev/null || ip link add ${interface} type dummy
  if ! test_vip; then
   ip addr add ${addr} dev ${interface}
  fi
  ip link set ${interface} up
}

function sleep () {
  exec /usr/bin/dumb-init bash -c "while :; do sleep 2073600; done"
}

function stop () {
  ip link show ${interface} > /dev/null || exit 0
  if test_vip; then
   ip addr del ${addr} dev ${interface}
  fi
  if [ "$(ip address show ${interface} | \
          awk "/inet / && /${interface}/{print \$2 }" | \
          wc -l)" -le "0" ]; then
    ip link set ${interface} down
    ip link del ${interface}
  fi
}

$COMMAND