#!/bin/sh
# Filename:      grml-hostname
# Purpose:       simple frontend to set hostname
# Authors:       (c) Michael Prokop <mika@grml.org>
# Bug-Reports:   see http://grml.org/bugs/
# License:       This file is licensed under the GPL v2.
# Latest change: Sam Sep 30 12:36:24 CEST 2006 [mika]
################################################################################

if [ $UID != 0 ] ; then
   echo Error: become root before starting $0 >& 2
   exit 100
fi

PN='grml-hostname'
TMP=$(mktemp)
OLDHOSTNAME="$(hostname)"

if [ -x /usr/bin/random-hostname ] ; then
   HOSTNAME="$(/usr/bin/random-hostname)"
else
   HOSTNAME="$(hostname)"
fi

bailout() {
  rm -f $TMP
  exit 1
}
trap bailout 1 2 3 15

# running inside grml2hd? Don't warn because of hostname + X
[ -n "$GRML2HD" ] || MSG='\n\nNotice: setting a different hostname while running X is *not* recommend!'

HOSTNAME="$(dialog --stdout --title "${PN}" --extra-button --extra-label "Propose hostname" \
--inputbox "Set hostname (/etc/hostname, /etc/hosts and /etc/postfix/main.cf will be adjusted)\
\n\nTip: press 'Propose hostname' for another proposal${MSG}" 14 70 $HOSTNAME)"
retval=$?

case $retval in
  0)
     if hostname "$HOSTNAME" 1>/dev/null 2>${TMP} ; then
       echo "$HOSTNAME" > /etc/hostname
       sed -i "s/^127.0.0.1[ \t]*$OLDHOSTNAME[ \t]*localhost/127.0.0.1       $HOSTNAME localhost/" /etc/hosts
       sed -i "s/^::1[ \t]*ip6-localhost ip6-loopback[ \t]*$OLDHOSTNAME/::1     ip6-localhost ip6-loopback $HOSTNAME/" /etc/hosts
       POSTFIX=''
       if [ -r /etc/postfix/main.cf ] ; then
         sed -i "s/^myhostname = .*/myhostname = $HOSTNAME/" /etc/postfix/main.cf && POSTFIX='
Configuration of myhostname in /etc/postfix/main.cf has been adjusted as well. Do not forget to restart postfix if necessary.'
       fi
       dialog --stdout --title "${PN}" --msgbox "Setting hostname to $HOSTNAME was successful.$POSTFIX" 0 0
     else
       dialog --stdout --title "${PN}" --msgbox "Error when setting hostname to $HOSTNAME: `cat $TMP`" 0 0
     fi
     ;;
  1)
     echo "Cancel pressed."
     ;;
  3)
     $0 ;;
  255)
     echo "ESC pressed."
     ;;
esac

rm -f $TMP 2>/dev/null

## END OF FILE #################################################################