package/fakedate/fakedate

   1 #!/bin/sh
   2 # vim: set sw=4 expandtab:
   3 #
   4 # This program is free software; you can redistribute it and/or modify
   5 # it under the terms of the GNU General Public License as published by
   6 # the Free Software Foundation; either version 2 of the License, or
   7 # (at your option) any later version.
   8 #
   9 # This program is distributed in the hope that it will be useful,
  10 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  12 # General Public License for more details.
  13 #
  14 # You should have received a copy of the GNU General Public License
  15 # along with this program; if not, write to the Free Software
  16 # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  17 #
  18 # Copyright (C) 2016 Jérôme Pouiller <jezz@sysmic.org>
  19 #
  20
  21 # Sanity check
  22 if ! readlink -f "$0" | grep -q fakedate; then
  23     echo "fakedate: Please name this script \`fakedate'"
  24     exit 1
  25 fi
  26
  27 DATE_BIN=false
  28 # Do not call `date' directly since it will produce an infinite recursion.
  29 # Instead, find path of true `date' binary.
  30 for P in `echo $PATH | tr ':' ' '`; do
  31     if [ -x "$P/date" ]; then
  32         if readlink -f "$P/date" | grep -qv fakedate; then
  33             DATE_BIN="$P/date"
  34             break;
  35         fi
  36     fi
  37 done
  38
  39 if [ -n "$SOURCE_DATE_EPOCH" ]; then
  40     FORCE_EPOCH=1
  41     for i in "$@"; do
  42         # Use of --date, --file and --reference (and their short option counter
  43         # parts) is incompatible with SOURCE_DATE_EPOCH.
  44         # -u and -R are the only short options without argument. So they could
  45         # appear between '-' and option we want to match.
  46         if echo "$i" | grep -qE '^-([uR]*d|-date|[uR]*f|-file|[uR]*r|--reference)'; then
  47             FORCE_EPOCH=0
  48             break;
  49         fi
  50     done
  51     if [ $FORCE_EPOCH -eq 1 ]; then
  52         echo "date: Warning: using \$SOURCE_DATE_EPOCH instead of true time" >&2
  53         exec $DATE_BIN -d "@$SOURCE_DATE_EPOCH" "$@"
  54     fi
  55 fi
  56
  57 exec $DATE_BIN "$@"