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[legal] Add licence.pl and %.licence make target
It is now possible to run e.g. make bin/rtl8139.dsk.licence in order to see a licensing assessment for any given gPXE build. The assessment will either produce a single overall licence for the build (based on combining all the licences used within the source files for that build), or will exit with an error stating why a licence assessment is not possible (for example, if there are files involved that do not yet contain an explicit FILE_LICENCE() declaration).
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Michael Brown
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May 18, 2009
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#!/usr/bin/perl -w | ||
# | ||
# Copyright (C) 2008 Michael Brown <mbrown@fensystems.co.uk>. | ||
# | ||
# This program is free software; you can redistribute it and/or | ||
# modify it under the terms of the GNU General Public License as | ||
# published by the Free Software Foundation; either version 2 of the | ||
# License, or any later version. | ||
# | ||
# This program is distributed in the hope that it will be useful, but | ||
# WITHOUT ANY WARRANTY; without even the implied warranty of | ||
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | ||
# General Public License for more details. | ||
# | ||
# You should have received a copy of the GNU General Public License | ||
# along with this program; if not, write to the Free Software | ||
# Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. | ||
|
||
use strict; | ||
use warnings; | ||
use Getopt::Long; | ||
|
||
# List of licences we can handle | ||
my $known_licences = { | ||
gpl_any => { | ||
desc => "GPL (any version)", | ||
can_subsume => { | ||
public_domain => 1, | ||
bsd3 => 1, | ||
bsd2 => 1, | ||
}, | ||
}, | ||
gpl2_or_later => { | ||
desc => "GPL version 2 (or, at your option, any later version)", | ||
can_subsume => { | ||
gpl_any => 1, | ||
public_domain => 1, | ||
bsd3 => 1, | ||
bsd2 => 1, | ||
}, | ||
}, | ||
gpl2_only => { | ||
desc => "GPL version 2 only", | ||
can_subsume => { | ||
gpl_any => 1, | ||
gpl2_or_later => 1, | ||
public_domain => 1, | ||
bsd3 => 1, | ||
bsd2 => 1, | ||
}, | ||
}, | ||
public_domain => { | ||
desc => "Public Domain", | ||
can_subsume => {}, | ||
}, | ||
bsd4 => { | ||
desc => "BSD Licence (with advertising clause)", | ||
can_subsume => { | ||
public_domain => 1, | ||
bsd3 => 1, | ||
bsd2 => 1, | ||
}, | ||
}, | ||
bsd3 => { | ||
desc => "BSD Licence (without advertising clause)", | ||
can_subsume => { | ||
public_domain => 1, | ||
bsd2 => 1, | ||
}, | ||
}, | ||
bsd2 => { | ||
desc => "BSD Licence (without advertising or endorsement clauses)", | ||
can_subsume => { | ||
public_domain => 1, | ||
}, | ||
}, | ||
}; | ||
|
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# Parse command-line options | ||
my $verbosity = 1; | ||
Getopt::Long::Configure ( 'bundling', 'auto_abbrev' ); | ||
GetOptions ( | ||
'verbose|v+' => sub { $verbosity++; }, | ||
'quiet|q+' => sub { $verbosity--; }, | ||
) or die "Could not parse command-line options\n"; | ||
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# Parse licence list from command line | ||
my $licences = {}; | ||
foreach my $licence ( @ARGV ) { | ||
die "Unknown licence \"$licence\"\n" | ||
unless exists $known_licences->{$licence}; | ||
$licences->{$licence} = $known_licences->{$licence}; | ||
} | ||
die "No licences specified\n" unless %$licences; | ||
|
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# Dump licence list | ||
if ( $verbosity >= 1 ) { | ||
print "The following licences appear within this file:\n"; | ||
foreach my $licence ( keys %$licences ) { | ||
print " ".$licences->{$licence}->{desc}."\n" | ||
} | ||
} | ||
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# Apply licence compatibilities to reduce to a single resulting licence | ||
foreach my $licence ( keys %$licences ) { | ||
# Skip already-deleted licences | ||
next unless exists $licences->{$licence}; | ||
# Subsume any subsumable licences | ||
foreach my $can_subsume ( keys %{$licences->{$licence}->{can_subsume}} ) { | ||
if ( exists $licences->{$can_subsume} ) { | ||
print $licences->{$licence}->{desc}." subsumes ". | ||
$licences->{$can_subsume}->{desc}."\n" | ||
if $verbosity >= 1; | ||
delete $licences->{$can_subsume}; | ||
} | ||
} | ||
} | ||
|
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# Print resulting licence | ||
die "Cannot reduce to a single resulting licence!\n" | ||
if ( keys %$licences ) != 1; | ||
( my $licence ) = keys %$licences; | ||
print "The overall licence for this file is:\n " if $verbosity >= 1; | ||
print $licences->{$licence}->{desc}."\n"; |