util/perl/OpenSSL/copyright.pm

   1 #! /usr/bin/env perl
   2 # Copyright 2021-2022 The OpenSSL Project Authors. All Rights Reserved.
   3 #
   4 # Licensed under the Apache License 2.0 (the "License").  You may not use
   5 # this file except in compliance with the License.  You can obtain a copy
   6 # in the file LICENSE in the source distribution or at
   7 # https://www.openssl.org/source/license.html
   8
   9 use strict;
  10 use warnings;
  11
  12 package OpenSSL::copyright;
  13
  14 sub year_of {
  15     my $file = shift;
  16
  17     return $ENV{'OSSL_COPYRIGHT_YEAR'} if defined $ENV{'OSSL_COPYRIGHT_YEAR'};
  18
  19     # Get the current year.  We use that as the default because the other
  20     # common case is that someone unpacked a tarfile and the file dates
  21     # are't properly set on extract.
  22     my $YEAR = [localtime()]->[5] + 1900;
  23
  24     # See if git's available
  25     open my $FH,
  26        "git log -1 --date=short --format=format:%cd $file 2>/dev/null|"
  27            or return $YEAR;
  28     my $LINE = <$FH>;
  29     close $FH;
  30     $LINE =~ s/^([0-9]*)-.*/$1/;
  31     $YEAR = $LINE if $LINE;
  32     return $YEAR;
  33 }
  34
  35 sub latest {
  36     my $l = 0;
  37     foreach my $f (@_ ) {
  38         my $y = year_of($f);
  39         $l = $y if $y > $l;
  40     }
  41     return $l
  42 }
  43 1;