t/ax/is_newest

   1 #! /bin/sh
   2 # Copyright (C) 2012-2017 Free Software Foundation, Inc.
   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, or (at your option)
   7 # 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
  12 # GNU 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, see <https://www.gnu.org/licenses/>.
  16
  17 # Usage: is_newest FILE FILES
  18 # Fail if any file in FILES is newer than FILE, and print the list of
  19 # such files on the standard error.  Resolve ties in favor of FILE.
  20
  21 # NOTE: keep this file Bourne-compatible, for the sake of systems with
  22 #       non-POSIX /bin/sh (like Solaris).
  23
  24 set -u
  25
  26 me=is_newest
  27
  28 if test $# -lt 2; then
  29   echo "$me: too few arguments" >&2
  30   exit 2
  31 fi
  32
  33 file=$1; shift
  34 newer_files=`find "$@" -prune -newer "$file"` || exit $?
  35
  36 if test -n "$newer_files"; then
  37   echo "$me: these files are newer than '$file':" >&2
  38   for f in $newer_files; do echo "* $f" >&2; done
  39   exit 1
  40 fi
  41
  42 exit 0