#!/bin/bash
#
# priority: 100
#
# Manage network related configuration files
#
# Mark Huang <mlhuang@cs.princeton.edu>
# Copyright (C) 2006 The Trustees of Princeton University
#

# Source function library and configuration
source /etc/plc.d/functions
source /etc/planetlab/plc_config

# Be verbose
set -x

[ "$PLC_HOSTS_ENABLED" -ne 1 ] && exit 0

case "$1" in
    start)
	MESSAGE=$"Generating network files"
	dialog "$MESSAGE"

	mv -f /etc/hosts /etc/hosts_plc.backup
	hfile=$(mktemp)
	# Minimal /etc/hosts
	for server in DB API BOOT WWW ; do
	    hostname=PLC_${server}_HOST
	    ip=PLC_${server}_IP
	    if [ -n "${!ip}" ] ; then
		echo "${!ip}	${!hostname}"
	    else
		ip=$(gethostbyname ${!hostname})
		if [ -n "$ip" ] ; then
		    echo "$ip	${!hostname}"
		fi
	    fi
	done > $hfile
	echo "#generated by /etc/plc.d/network" >/etc/hosts
	echo "127.0.0.1	localhost.localdomain localhost" >> /etc/hosts
	sort -u $hfile >> /etc/hosts
	chmod +r /etc/hosts
	rm -f $hfile

	result "$MESSAGE"
	;;

    stop)
	MESSAGE=$"Reverting network files"
	if [ -f /etc/hosts_plc.backup ] ; then
	    mv -f /etc/hosts_plc.backup /etc/hosts
	fi
	dialog "$MESSAGE"
	result "$MESSAGE"
	;;
esac

exit $ERRORS