aboutsummaryrefslogtreecommitdiffstats
path: root/gpxe/src/util/licence.pl
diff options
context:
space:
mode:
Diffstat (limited to 'gpxe/src/util/licence.pl')
-rwxr-xr-xgpxe/src/util/licence.pl149
1 files changed, 149 insertions, 0 deletions
diff --git a/gpxe/src/util/licence.pl b/gpxe/src/util/licence.pl
new file mode 100755
index 00000000..c37685d3
--- /dev/null
+++ b/gpxe/src/util/licence.pl
@@ -0,0 +1,149 @@
+#!/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,
+ mit => 1,
+ isc => 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,
+ mit => 1,
+ isc => 1,
+ },
+ },
+ gpl2_only => {
+ desc => "GPL version 2 only",
+ can_subsume => {
+ gpl_any => 1,
+ gpl2_or_later => 1,
+ public_domain => 1,
+ bsd3 => 1,
+ bsd2 => 1,
+ mit => 1,
+ isc => 1,
+ },
+ },
+ public_domain => {
+ desc => "Public Domain",
+ can_subsume => {},
+ },
+ bsd4 => {
+ desc => "BSD Licence (with advertising clause)",
+ can_subsume => {
+ public_domain => 1,
+ bsd3 => 1,
+ bsd2 => 1,
+ mit => 1,
+ isc => 1,
+ },
+ },
+ bsd3 => {
+ desc => "BSD Licence (without advertising clause)",
+ can_subsume => {
+ public_domain => 1,
+ bsd2 => 1,
+ mit => 1,
+ isc => 1,
+ },
+ },
+ bsd2 => {
+ desc => "BSD Licence (without advertising or endorsement clauses)",
+ can_subsume => {
+ public_domain => 1,
+ mit => 1,
+ isc => 1,
+ },
+ },
+ mit => {
+ desc => "MIT/X11/Xorg Licence",
+ can_subsume => {
+ public_domain => 1,
+ isc => 1,
+ },
+ },
+ isc => {
+ desc => "ISC Licence",
+ can_subsume => {
+ public_domain => 1,
+ },
+ },
+};
+
+# 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";
+
+# 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;
+
+# 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"
+ }
+}
+
+# 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};
+ }
+ }
+}
+
+# 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";