src/scripts/timezone-transition

   1 #!/bin/bash
   2 ###############################################################################
   3 #                                                                             #
   4 # IPFire.org - A linux based firewall                                         #
   5 # Copyright (C) 2007-2022  IPFire Team  <info@ipfire.org>                     #
   6 #                                                                             #
   7 # This program is free software: you can redistribute it and/or modify        #
   8 # it under the terms of the GNU General Public License as published by        #
   9 # the Free Software Foundation, either version 3 of the License, or           #
  10 # (at your option) any later version.                                         #
  11 #                                                                             #
  12 # This program is distributed in the hope that it will be useful,             #
  13 # but WITHOUT ANY WARRANTY; without even the implied warranty of              #
  14 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the               #
  15 # GNU General Public License for more details.                                #
  16 #                                                                             #
  17 # You should have received a copy of the GNU General Public License           #
  18 # along with this program.  If not, see <http://www.gnu.org/licenses/>.       #
  19 #                                                                             #
  20 ###############################################################################
  21 #
  22 # This script checks if a daylight saving time transition
  23 # has just happened and will run the given command.
  24
  25 HOUR_NOW=$(date "+%H")
  26 HOUR_THEN=$(date --date="1 hour ago" "+%H")
  27
  28 # We expect that the result in HOUR_THEN is HOUR_NOW - 1
  29 HOUR_EXPECTED=$(( ${HOUR_NOW} - 1 ))
  30
  31 if [ "${HOUR_EXPECTED}" -eq "${HOUR_THEN}" ]; then
  32         exit 0
  33 fi
  34
  35 $@