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      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;
     44