#! /bin/bash
# Copyright 2013 Google Inc. All Rights Reserved.
#
# 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.

# Deal with a new hostname assignment.

if [[ -n "$new_host_name" && -n "$new_ip_address" ]]; then
  # Delete entries with new_host_name or new_ip_address in /etc/hosts.
  sed -i '/Added by Google/d' /etc/hosts

  # Add an entry for our new_host_name/new_ip_address in /etc/hosts.
  echo "${new_ip_address} ${new_host_name} ${new_host_name%%.*}  # Added by Google" >> /etc/hosts
fi

# /sbin/dhclient-scripts in both ubuntu and centos have some problems for us:
#  1) BOUND doesn't always set hostname (e.g. if old_host_name is unset in
#     precise pangolin)
#  2) Using too long of a FQDN as a hostname causes some tools to break in
#     some distros (e.g. ssh-keygen) and hostname tool complains when given
#     a FQDN that is > 64 bytes.
#
# As a result, we set the host name in all circumstances here, to the truncated
# unqualified domain name.

if [[ -n "$new_host_name" ]]; then
  hostname ${new_host_name%%.*}

  # Let syslogd know we've changed the hostname.
  pkill -HUP syslogd
fi

