#! /bin/bash

#  Copyright (C) 2008, 2009  Matias A. Fonzo, Santiago del Estero, AR
#  Copyright (C) 2011  Matias A. Fonzo, Santiago del Estero, Argentina
#
#  This program is free software: you can redistribute it and/or modify
#  it under the terms of the GNU General Public License as published by
#  the Free Software Foundation, either version 3 of the License, or
#  (at your option) any later version.
#
#  This program is distributed in the hope that it will be useful,
#  but WITHOUT ANY WARRANTY; without even the implied warranty of
#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
#  GNU General Public License for more details.
#
#  You should have received a copy of the GNU General Public License
#  along with this program.  If not, see <http://www.gnu.org/licenses/>.

# Localization:
TEXTDOMAINDIR=/usr/share/locale
TEXTDOMAIN=tzconfig

# Sanity check:
mkdir -p /etc/sysconfig
mkdir -p -m 1777 /tmp

TempFile=/tmp/tzconfig-reply$$

# A function for display messages:
msg() { printf '%s\n' "$@"; }

# A function to generate the config file:
hwclock_cfg() {
  msg \
   "# /etc/sysconfig/hardwareclock:  Set up the system clock according to" \
   "#                                the clock of the machine." \
   "#" \
   "# UTC / localtime:" \
   "" \
   "$1" \
   "" \
   > /etc/sysconfig/hardwareclock
}

dialog \
 --backtitle $"Time zone configuration" \
 --title $"SELECT YOUR TIME ZONE" \
 --menu \
$"The local time is the one shown in a clock hanging on \
the wall.  While UTC is the time in Greenwich.\n\n\
In what format do you want to save the time?:" 14 0 2 \
 "Local" $"Local time" \
 "UTC"   $"Coordinated Universal Time" \
  2> $TempFile
RETCODE=$?
(( $RETCODE != 0 )) && {
  rm -f $TempFile
  exit $RETCODE;
}

if grep -qs ^Local $TempFile ; then
  hwclock_cfg 'localtime'
else
  hwclock_cfg 'UTC'
fi

# Scan the zones in order to generate the menu options:
( cd /usr/share/zoneinfo || exit 1;
  rm -f timezone.data

  export LC_ALL=C

  find . -type f | xargs file | sed -n "/timezone data/p" | \
   cut -f 1 -d : | cut -b3-   | sort | while read zone ; do
    echo "\"${zone}\" \"\" \\" >> /usr/share/zoneinfo/timezone.data
   done

  msg \
   " 2> /tmp/zoneinfo-reply"               \
   "STATUS=\$?"                            \
   "(( \$STATUS != 0 )) && exit \$STATUS;" \
    >> /usr/share/zoneinfo/timezone.data
)

# Prepare for display the menu:
if [[ -f /usr/share/zoneinfo/timezone.data ]]; then
  printf "%s\n" H 1i \
   "dialog \\" \
   " --backtitle "$"'Time zone configuration'"" \\" \
   " --title "$"'SELECT YOUR TIME ZONE'"" \\" \
   " --menu \"\" 21 50 15 \\" . w | \
    ed -s /usr/share/zoneinfo/timezone.data

  . /usr/share/zoneinfo/timezone.data && RETCODE=$?;
fi

ZONE_INFO=$(cut -f1 -d ' ' /tmp/zoneinfo-reply 2>/dev/null)

# Copy the time zone file as /etc/localtime:
if [[ -n $ZONE_INFO ]]; then
  ( cd /usr/share/zoneinfo
    rm -f localtime
    ln -s $ZONE_INFO localtime
    cp -p --remove-destination \
     /usr/share/zoneinfo/${ZONE_INFO} /etc/localtime
  )
fi

rm -f /tmp/zoneinfo-reply $TempFile  ## Clean up.

exit $RETCODE