src/scripts/timezone-transition

   1 #!/bin/bash
   2 ############################################################################
   3 #                                                                          #
   4 # This file is part of the IPFire Firewall.                                #
   5 #                                                                          #
   6 # IPFire is free software; you can redistribute it and/or modify           #
   7 # it under the terms of the GNU General Public License as published by     #
   8 # the Free Software Foundation; either version 2 of the License, or        #
   9 # (at your option) any later version.                                      #
  10 #                                                                          #
  11 # IPFire is distributed in the hope that it will be useful,                #
  12 # but WITHOUT ANY WARRANTY; without even the implied warranty of           #
  13 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the            #
  14 # GNU General Public License for more details.                             #
  15 #                                                                          #
  16 # You should have received a copy of the GNU General Public License        #
  17 # along with IPFire; if not, write to the Free Software                    #
  18 # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA #
  19 #                                                                          #
  20 # Copyright (C) 2014 IPFire Team <info@ipfire.org>                         #
  21 #                                                                          #
  22 ############################################################################
  23
  24 # This script checks if a daylight saving time transition
  25 # has just happened and will run the given command.
  26
  27 HOUR_NOW=$(date "+%H")
  28 HOUR_THEN=$(date --date="1 hour ago" "+%H")
  29
  30 # We expect that the result in HOUR_THEN is HOUR_NOW - 1
  31 HOUR_EXPECTED=$(( ${HOUR_NOW} - 1 ))
  32
  33 if [ "${HOUR_EXPECTED}" -eq "${HOUR_THEN}" ]; then
  34         exit 0
  35 fi
  36
  37 $@