#!/usr/bin/perl
use strict;

# This script expects the directory ~/samba-rsync-ftp to exist and to be a
# copy of the /home/ftp/pub/rsync dir on samba.org.  When the script is done,
# the git repository in the current directory will be updated, and the local
# ~/samba-rsync-ftp dir will be ready to be rsynced to samba.org.

use Cwd;
use Date::Format;

my $dest = $ENV{HOME} . '/samba-rsync-ftp';

my $now = time;
my $cl_today = time2str('* %a %b %d %Y', $now);
my $year = time2str('%Y', $now);
my $ztoday = time2str('%d %b %Y', $now);
(my $today = $ztoday) =~ s/^0//;

my $curdir = Cwd::cwd;

my @extra_files;
open(IN, '<', 'Makefile.in') or die "Couldn't open Makefile.in: $!\n";
while (<IN>) {
    if (s/^GENFILES=//) {
	while (s/\\$//) {
	    $_ .= <IN>;
	}
	@extra_files = split(' ', $_);
	last;
    }
}
close IN;

my $break = <<EOT;
==========================================================================
EOT

print $break, <<EOT, $break, "\n";
== This will release a new version of rsync onto an unsuspecting world. ==
EOT

die "$dest does not exist\n" unless -d $dest;
die "There is no .git dir in the current directory.\n" unless -d '.git';
die "'a' must not exist in the current directory.\n" if -e 'a';
die "'b' must not exist in the current directory.\n" if -e 'b';

open(IN, '-|', 'git status') or die $!;
my $status = join('', <IN>);
close IN;
die "The checkout is not clean:\n", $status unless $status =~ /\nnothing to commit \(working directory clean\)/;
die "The checkout is not on the master branch.\n" unless $status =~ /^# On branch master\n/;

my $confversion;
open(IN, '<', 'configure.in') or die $!;
while (<IN>) {
    if (/^RSYNC_VERSION=(.*)/) {
	$confversion = $1;
	last;
    }
}
close IN;
die "Unable to find RSYNC_VERSION in configure.in\n" unless defined $confversion;

open(IN, '<', 'OLDNEWS') or die $!;
$_ = <IN>;
close IN;
my($lastversion) = /(\d+\.\d+\.\d+)/;

my $version = $confversion;
$version =~ s/dev/pre1/ || $version =~ s/pre(\d+)/ 'pre' . ($1 + 1) /e;

print "Please enter the version number of this release: [$version] ";
chomp($_ = <STDIN>);
if ($_ eq '.') {
    $version =~ s/pre\d+//;
} elsif ($_ ne '') {
    $version = $_;
}

if ($version =~ s/[-.]*pre[-.]*/pre/ && $confversion !~ /dev$/) {
    $lastversion = $confversion;
}

print "Enter the previous version to produce a patch against: [$lastversion] ";
chomp($_ = <STDIN>);
$lastversion = $_ if $_ ne '';
$lastversion =~ s/[-.]*pre[-.]*/pre/;

my $release = 1;
print "Please enter the RPM release number of this release: [$release] ";
chomp($_ = <STDIN>);
$release = $_ if $_ ne '';

my($srcdir,$srcdiffdir,$lastsrcdir,$skipping);
if ($lastversion =~ /pre/) {
    if ($version !~ /pre/) {
	die "You should not diff a release version against a pre-release version.\n";
    }
    $srcdir = $srcdiffdir = $lastsrcdir = 'src-previews';
    $skipping = ' ** SKIPPING **';
} elsif ($version =~ /pre/) {
    $srcdir = $srcdiffdir = 'src-previews';
    $lastsrcdir = 'src';
    $skipping = ' ** SKIPPING **';
} else {
    $srcdir = $lastsrcdir = 'src';
    $srcdiffdir = 'src-diffs';
    $skipping = '';
}

print "\n", $break, <<EOT;
\$version is "$version"
\$lastversion is "$lastversion"
\$dest is "$dest"
\$curdir is "$curdir"
\$srcdir is "$srcdir"
\$srcdiffdir is "$srcdiffdir"
\$lastsrcdir is "$lastsrcdir"
\$release is "$release"

About to:
    - make sure that SUBPROTOCOL_VERSION is 0$skipping
    - tweak the version in configure.in and the spec files
    - tweak NEWS and OLDNEWS to update the release date$skipping
    - tweak the date in the *.yo files and generate the man pages
    - generate configure.sh, config.h.in, and proto.h
    - page through the differences

EOT
print "<Press Enter to continue> ";
$_ = <STDIN>;

(my $finalversion = $version) =~ s/pre\d+//;
my %specvars = ( 'Version:' => $version, 'Release:' => $release,
		 'Released' => "$version." );
my @tweak_files = ( glob('packaging/*.spec'), glob('packaging/*/*.spec'), glob('*.yo'),
		    qw( configure.in rsync.h NEWS OLDNEWS options.c ) );

foreach my $fn (@tweak_files) {
    open(IN, '<', $fn) or die $!;
    undef $/; $_ = <IN>; $/ = "\n";
    close IN;
    if ($fn =~ /configure/) {
	s/^RSYNC_VERSION=.*/RSYNC_VERSION=$version/m
	    or die "Unable to update RSYNC_VERSION in $fn\n";
    } elsif ($fn =~ /\.spec/) {
	while (my($str, $val) = each %specvars) {
	    s/^\Q$str\E .*/$str $val/m
		or die "Unable to update $str in $fn\n";
	}
	s/^\* \w\w\w \w\w\w \d\d \d\d\d\d (.*)/$cl_today $1/m
	    or die "Unable to update ChangeLog header in $fn\n";
    } elsif ($fn =~ /\.yo/) {
	s/^(manpage\([^)]+\)\(\d+\)\()[^)]+(\).*)/$1$today$2/m
	    or die "Unable to update date in manpage() header in $fn\n";
	s/^(This man ?page is current for version) \S+ (of rsync)/$1 $version $2/m
	    or die "Unable to update current version info in $fn\n";
    } elsif ($fn eq 'rsync.h') {
	s/(#define\s+SUBPROTOCOL_VERSION)\s+\d+/$1 0/
	    or die "Unable to find SUBPROTOCOL_VERSION define in $fn\n";
	next if $version =~ /pre/;
    } elsif ($fn eq 'NEWS') {
	s/^(NEWS for rsync \Q$finalversion\E) \(UNRELEASED\)\s*\n/$1 ($today)\n/mi
	    or die "The first line of $fn is not in the right format.  It must be:\n"
		 . "NEWS for rsync $finalversion (UNRELEASED)\n";
	next if $version =~ /pre/;
    } elsif ($fn eq 'OLDNEWS') {
	s/^\t\S\S\s\S\S\S\s\d\d\d\d(\t\Q$finalversion\E)/\t$ztoday$1/m
	    or die "Unable to find \"?? ??? $year\t$finalversion\" line in $fn\n";
	next if $version =~ /pre/;
    } elsif ($fn eq 'options.c') {
	if (s/(Copyright \(C\) 2002-)(\d+)( Wayne Davison)/$1$year$3/
	 && $2 ne $year) {
	    die "Copyright comments need to be updated to $year in all files!\n";
	}
	# Adjust the year in the --version output.
	s/(rprintf\(f, "Copyright \(C\) 1996-)(\d+)/$1$year/
	    or die "Unable to find Copyright string in --version output of $fn\n";
	next if $2 eq $year;
    } else {
	die "Unrecognized file in \@tweak_files: $fn\n";
    }
    open(OUT, '>', $fn) or die $!;
    print OUT $_;
    close OUT;
}

print $break;
system "git diff --color | less -p '^diff .*'";

my $srctar_name = "rsync-$version.tar.gz";
my $pattar_name = "rsync-patches-$version.tar.gz";
my $diff_name = "rsync-$lastversion-$version.diffs.gz";
my $srctar_file = "$dest/$srcdir/$srctar_name";
my $pattar_file = "$dest/$srcdir/$pattar_name";
my $diff_file = "$dest/$srcdiffdir/$diff_name";
my $news_file = "$dest/$srcdir/rsync-$version-NEWS";
my $lasttar_file = "$dest/$lastsrcdir/rsync-$lastversion.tar.gz";

print $break, <<EOT;

About to:
    - commit all changes
    - tag this release as v$version
    - update hard-linked top-level files for new version$skipping
    - create release tar, "$srctar_name"
    - create patches tar, "$pattar_name"
    - create release diffs, "$diff_name"
    - update patch branches and generate patch/* files
    - update README, *NEWS, TODO, and ChangeLog
    - update rsync*.html man pages
    - gpg-sign the release files

EOT
print "<Press Enter to continue> ";
$_ = <STDIN>;

system "git commit -a -m 'Preparing for release of $version'" and exit 1;
print "\nSign the tag:";
system "git tag -s -m 'Version $version.' v$version" and exit 1;

# Extract the generated files from the old tar.
@_ = @extra_files;
map { s#^#rsync-$lastversion/# } @_;
system "tar xzf $lasttar_file @_";
rename("rsync-$lastversion", 'a');

print "Creating $diff_file ...\n";
system "./config.status Makefile; make gen; rsync -a @extra_files b/";
my $sed_script = 's:^((---|\+\+\+) [ab]/[^\t]+)\t.*:\1:';
system "(git diff v$lastversion v$version; diff -upN a b | sed -r '$sed_script') | gzip -9 >$diff_file";
system "rm -rf a";
rename('b', "rsync-$version");

print "Creating $srctar_file ...\n";
system "git archive --format=tar --prefix=rsync-$version/ v$version | tar xf -";
system "support/git-set-file-times --prefix=rsync-$version/";
system "fakeroot tar czf $srctar_file rsync-$version; rm -rf rsync-$version";

mkdir("rsync-$version", 0755);
mkdir("rsync-$version/patches", 0755);
system "support/patch-update --skip-check --gen=rsync-$version/patches";
system "fakeroot tar chzf $pattar_file rsync-$version/patches; rm -rf rsync-$version";

print "Updating the other files in $dest ...\n";
system "rsync -a README NEWS OLDNEWS TODO $dest";
unlink($news_file);
link("$dest/NEWS", $news_file);
system "git log --name-status | gzip -9 >$dest/ChangeLog.gz";

system "yodl2html -o $dest/rsync.html rsync.yo";
system "yodl2html -o $dest/rsyncd.conf.html rsyncd.conf.yo";

my $cnt = 0;
print "\n";
foreach my $fn ($srctar_file, $pattar_file, $diff_file) {
    print ++$cnt, ". Sign file \"$fn\":";
    system "gpg -ba $fn";
}

if ($version !~ /pre/) {
    system "rm $dest/rsync-*{.tar.gz,.asc,-NEWS} $dest/src-preview/rsync-*diffs.gz";

    foreach my $fn ($srctar_file, "$srctar_file.asc",
		    $pattar_file, "$pattar_file.asc",
		    $diff_file, "$diff_file.asc", $news_file) {
	(my $top_fn = $fn) =~ s#/src(-\w+)?/#/#;
	link($fn, $top_fn);
    }
}

print $break, <<'EOT';

Local changes are done.  When you're satisfied, push the git repository
and rsync the release files.  Remember to announce the release on *BOTH*
rsync-announce@lists.samba.org and rsync@lists.samba.org (and the web)!
EOT