plc.d/network

   1 #!/bin/bash
   2 # $Id$
   3 # $URL$
   4 #
   5 # priority: 100
   6 #
   7 # Manage network related configuration files
   8 #
   9 # Mark Huang <mlhuang@cs.princeton.edu>
  10 # Copyright (C) 2006 The Trustees of Princeton University
  11 #
  12
  13 # Source function library and configuration
  14 . /etc/plc.d/functions
  15 . /etc/planetlab/plc_config
  16
  17 # Be verbose
  18 set -x
  19
  20 [ "$PLC_HOSTS_ENABLED" -ne 1 ] && exit 0
  21
  22 case "$1" in
  23     start)
  24         MESSAGE=$"Generating network files"
  25         dialog "$MESSAGE"
  26
  27         mv -f /etc/hosts /etc/hosts_plc.backup
  28         hfile=$(mktemp)
  29         # Minimal /etc/hosts
  30         for server in DB API BOOT WWW ; do
  31             hostname=PLC_${server}_HOST
  32             ip=PLC_${server}_IP
  33             if [ -n "${!ip}" ] ; then
  34                 echo "${!ip}    ${!hostname}"
  35             else
  36                 ip=$(gethostbyname ${!hostname})
  37                 if [ -n "$ip" ] ; then
  38                     echo "$ip   ${!hostname}"
  39                 fi
  40             fi
  41         done > $hfile
  42         echo "#generated by /etc/plc.d/network" >/etc/hosts
  43         echo "127.0.0.1 localhost.localdomain localhost" >> /etc/hosts
  44         sort -u $hfile >> /etc/hosts
  45         chmod +r /etc/hosts
  46         rm -f $hfile
  47
  48         result "$MESSAGE"
  49         ;;
  50
  51     stop)
  52         MESSAGE=$"Reverting network files"
  53         if [ -f /etc/hosts_plc.backup ] ; then
  54             mv -f /etc/hosts_plc.backup /etc/hosts
  55         fi
  56         dialog "$MESSAGE"
  57         result "$MESSAGE"
  58         ;;
  59 esac
  60
  61 exit $ERRORS