Switch jgit library to the EDL (3-clause BSD)

Switch jgit library to the EDL (3-clause BSD)

This is a machine transform of the headers in the jgit packages,
switching the license to the EDL, which is a 3-clause BSD license.
The script used (attached below) updated the copyright statements
based upon the output of git-blame, as not all copyright statements
were actually current.

This change is based upon the following emails to the Git mailing
list by myself, Robin Rosenburg and David Watson:

  http://article.gmane.org/gmane.comp.version-control.git/81585
  > From Shawn O. Pearce <spearce@spearce.org>
  >
  > Since its inception on March 6, 2006 jgit has been under the
  > GPLv2 license.  To make the library available to a wider audience
  > (including but not limited to the Eclipse Git plugin, numerous
  > Apache projects such as Ant/Maven, the Netbeans IDE, etc.) we are
  > switching to a dual license between a 3-clause BSD (the EDL)
  > and the EPL.

  http://article.gmane.org/gmane.comp.version-control.git/81604
  > From Robin Rosenberg <robin.rosenburg@dewire.com>
  >
  > I confirm this is fine with me.

  http://article.gmane.org/gmane.comp.version-control.git/81594
  > From Dave Watson <dwatson@mimvista.com>
  >
  > I have no objection to the relicense, if it will help things out.

No other parties consent is required for this change, as according
to git-blame more than 99.9% of the jgit code is owned by these
three individuals.

Confirmed-by: Robin Rosenberg <robin.rosenburg@dewire.com>
Confirmed-by: Dave Watson <dwatson@mimvista.com>
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
--8<--

open(F, '-|','git','ls-files');
while (<F>) {
	chop;
	next unless m,^org.spearce.jgit(?:.test)?/,;
	next unless m,\.java$,;

	my $old_file = $_;
	my $new_file = "$old_file.license.$$";
	my $header = '';
	my $package = '';

	open(I,'<',$old_file);
	while (<I>) {
		if (/^package /) {
			$package = $_;
			last;
		}

		$header .= $_;
	}
	die "$old_file has no package line.\n" unless $package;

	if ($header =~ / - Redistributions of source code must retain/) {
		close I;
		next;
	}

	my $lineno = $.;
	my $author_name;
	my $author_email;
	my %all_years;
	my %author_years;

	print "$old_file\n";
	open(B,'-|','git','blame',
		"-L$lineno,",
		'-C','-C',
		'--whitespace',
		'-p',
		$old_file);
	while (<B>) {
		chop;
		if (/^author (.*)$/) {
			$author_name = $1;
			next;
		}
		if (/^author-mail (<.*>)$/) {
			$author_email = $1;
			next;
		}
		if (/^author-time (\d+)$/) {
			my $year = (localtime($1))[5] + 1900;
			$all_years{$year} = 1;
			$author_years{"$author_name $author_email"}{$year} = 1;
		}
	}
	close B;

	open(O,'>',$new_file);
	print O "/*\n";

	my %used_author;
	foreach my $year (sort {$a cmp $b} keys %all_years) {
		foreach my $who (sort keys %author_years) {
			next if $used_author{$who}++;
			my $y = (sort {$b cmp $a} keys %{$author_years{$who}})[0];
			print O " * Copyright (C) $y, $who\n";
		}
	}

	print O <<'EOF';
 *
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or
 * without modification, are permitted provided that the following
 * conditions are met:
 *
 * - Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 *
 * - Redistributions in binary form must reproduce the above
 *   copyright notice, this list of conditions and the following
 *   disclaimer in the documentation and/or other materials provided
 *   with the distribution.
 *
 * - Neither the name of the Git Development Community nor the
 *   names of its contributors may be used to endorse or promote
 *   products derived from this software without specific prior
 *   written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
 * CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

EOF
	print O $package;
	print O while <I>;
	close I;
	close O;
	rename($new_file, $old_file);
}
close F;