1#! /bin/sh
2# Copyright (C) 2012-2021 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
24set -u
25
26me=is_newest
27
28if test $# -lt 2; then
29  echo "$me: too few arguments" >&2
30  exit 2
31fi
32
33file=$1; shift
34newer_files=`find "$@" -prune -newer "$file"` || exit $?
35
36if test -n "$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
40fi
41
42exit 0
43