plc.d/network

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