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#!/usr/bin/perl
use Getopt::Std;
use FindBin;
use Cwd;
use lib "$FindBin::Bin";
use metadata;
use warnings;
use strict;

chdir "$FindBin::Bin/..";
$ENV{TOPDIR}=getcwd();

my @feeds;
my %build_packages;
my %installed;

sub parse_config() {
	my $line = 0;
	my %name;

	open FEEDS, "feeds.conf";
	while (<FEEDS>) {
		chomp;
		s/#.+$//;
		next unless /\S/;
		my @line = split /\s+/, $_, 3;
		$line++;

		my $valid = 1;
		$line[0] =~ /^src-\w+$/ or $valid = 0;
		$line[1] =~ /^\w+$/ or $valid = 0;
		$line[2] =~ /\s/ and $valid = 0;
		$valid or die "Syntax error in feeds.list, line: $line\n";

		$name{$line[1]} and die "Duplicate feed name '$line[1]', line: $line\n";
		$name{$line[1]} = 1;

		push @feeds, [@line];
	}
	close FEEDS;
}

sub update_svn($$) {
	my $name = shift;
	my $src = shift;

	system("svn co $src ./feeds/$name") == 0 or return 1;
	-d "./feeds/$name.tmp" or mkdir "./feeds/$name.tmp" or return 1;
	-d "./feeds/$name.tmp/info" or mkdir "./feeds/$name.tmp/info" or return 1;

	system("make -s prepare-mk TMP_DIR=\"$ENV{TOPDIR}/feeds/$name.tmp\"");
	system("make -s -f include/scan.mk IS_TTY=1 SCAN_TARGET=\"packageinfo\" SCAN_DIR=\"feeds/$name\" SCAN_NAME=\"package\" SCAN_DEPS=\"$ENV{TOPDIR}/include/package*.mk\" SCAN_DEPTH=4 SCAN_EXTRA=\"\" TMP_DIR=\"$ENV{TOPDIR}/feeds/$name.tmp\"");
	system("ln -sf $name.tmp/.packageinfo ./feeds/$name.index");

	return 0;
}

sub get_feed($) {
	my $feed = shift;

	clear_packages();
	parse_package_metadata("./feeds/$feed.index") or return;
	return { %package };
}

sub get_installed() {
	system("make -s prepare-tmpinfo");
	clear_packages();
	parse_package_metadata("./tmp/.packageinfo");
	%installed = %package;
}

sub search_feed {
	my $feed = shift;
	my @substr = @_;
	my $display;
	
	return unless @substr > 0;
	get_feed($feed);
	foreach my $name (sort { lc($a) cmp lc($b) } keys %package) {
		my $pkg = $package{$name};
		my $substr;
		my $pkgmatch = 1;

		foreach my $substr (@substr) {
			my $match;
			foreach my $key (qw(name title description)) {
				$pkg->{$key} and $substr and $pkg->{$key} =~ m/$substr/i and $match = 1;
			}
			$match or undef $pkgmatch;
		};
		$pkgmatch and do {
			$display or do {
				print "Search results in feed '$feed':\n";
				$display = 1;
			};
			printf "\%-25s\t\%s\n", $pkg->{name}, $pkg->{title};
		};
	}
	return 0;
}


sub search {
	my %opts;

	getopt('r:', \%opts);
	foreach my $feed (@feeds) {
		search_feed($feed->[1], @ARGV) if (!defined($opts{r}) or $opts{r} eq $feed->[1]);
	}
}

sub install_svn() {
	my $feed = shift;
	my $pkg = shift;
	my $path = $pkg->{makefile};
	$path =~ s/\/Makefile$//;

	-d "./package/feeds" or mkdir "./package/feeds";
	-d "./package/feeds/$feed->[1]" or mkdir "./package/feeds/$feed->[1]";
	system("ln -sf ../../../$path ./package/feeds/$feed->[1]/");

	return 0;
}

my %install_method = (
	'src-svn' => \&install_svn
);

my %feed;

sub lookup_package($$) {
	my $feed = shift;
	my $package = shift;

	foreach my $feed ($feed, @feeds) {
		next unless $feed->[1];
		next unless $feed{$feed->[1]};
		$feed{$feed->[1]}->{$package} and return $feed;
	}
	return;
}

sub install_package {
	my $feed = shift;
	my $name = shift;
	my $ret = 0;

	$feed = lookup_package($feed, $name);
	$feed or do {
		$installed{$name} and return 0;
		warn "WARNING: Package '$name' is not available.\n";
		return 1;
	};

	my $pkg = $feed{$feed->[1]}->{$name} or return 1;
	my $src = $pkg->{src};
	my $type = $feed->[0];
	$src or $src = $name;

	# previously installed packages set the runtime package
	# newly installed packages set the source package
	$installed{$src} and return 0;

	# install all dependencies
	foreach my $dep (@{$pkg->{depends}}) {
		next if $dep =~ /@/;
		$dep =~ s/^\+//;
		install_package($feed, $dep) == 0 or $ret = 1;
	}

	# check previously installed packages
	$installed{$name} and return 0;
	$installed{$src} = 1;
	warn "Installing package '$src'\n";

	$install_method{$type} or do {
		warn "Unknown installation method: '$type'\n";
		return 1;
	};

	&{$install_method{$type}}($feed, $pkg) == 0 or do {
		warn "failed.\n";
		return 1;
	};

	return $ret;
}

sub refresh_config {
	my $default = shift;
	$default or $default = "o";

	# workaround for timestamp check
	system("rm -f tmp/.packageinfo");

	# refresh the config 
	system("make oldconfig CONFDEFAULT=\"$default\" Config.in >/dev/null 2>/dev/null");
}

sub install {
	my $name;
	my %opts;
	my $feed;
	my $ret = 0;
	
	getopt('p:d:', \%opts);
	get_installed();

	foreach my $f (@feeds) {
		# index all feeds
		$feed{$f->[1]} = get_feed($f->[1]);

		# look up the preferred feed
		$opts{p} and $f->[1] eq $opts{p} and $feed = $f;
	}

	while ($name = shift @ARGV) {
		install_package($feed, $name) == 0 or $ret = 1;
	}

	# workaround for timestamp check
	
	# set the defaults
	if ($opts{d} and $opts{d} =~ /^[ymn]$/) {
		refresh_config($opts{d});
	}

	return $ret;
}

sub uninstall {
	my $name;
	my $uninstall;

	if ($ARGV[0] eq '-a') {
		system("rm -rf ./package/feeds");
		$uninstall = 1;
	} else {
		get_installed();
		while ($name = shift @ARGV) {
			my $pkg = $installed{$name};
			$pkg or do {
				warn "WARNING: $name not installed\n";
				next;
			};
			$pkg->{src} and $name = $pkg->{src};
			warn "Uninstalling package '$name'\n";
			system("rm -f ./package/feeds/*/$name");
			$uninstall = 1;
		}
	}
	$uninstall and refresh_config();
	return 0;
}

sub usage() {
	print <<EOF;
Usage: $0 <command> [options]

Commands:
	install [options] <package>: Install a package
	Options:
	    -p <feedname>: Prefer this feed when installing packages
	    -d <y|m|n>:    Set default for newly installed packages

	search [options] <substring>: Search for a package
	Options:
	    -r <feedname>: Only search in this feed

	uninstall -a|<package>: Uninstall a package
	    -a uninstalls all packages

	update:	Update packages and lists of feeds in feeds.list
	clean: Remove downloaded/generated files

EOF
	exit(1);
}

my %update_method = (
	'src-svn' => \&update_svn
);

my %commands = (
	'update' => sub {
		-d "feeds" or do {
			mkdir "feeds" or die "Unable to create the feeds directory";
		};
		$ENV{SCAN_COOKIE} = $$;
		$ENV{KBUILD_VERBOSE} = 99;
		foreach my $feed (@feeds) {
			my ($type, $name, $src) = @$feed;
			$update_method{$type} or do {
				warn "Unknown type '$type' in feed $name\n";
				next;
			};
			warn "Updating feed '$name'...\n";
			&{$update_method{$type}}($name, $src) == 0 or do {
				warn "failed.\n";
				return 1;
			};
		}
		return 0;
	},
	'install' => \&install,
	'search' => \&search,
	'uninstall' => \&uninstall,
	'clean' => sub {
		system("rm -rf feeds");
	}
);

my $arg = shift @ARGV;
$arg or usage();
parse_config;
foreach my $cmd (keys %commands) {
	$arg eq $cmd and do {
		exit(&{$commands{$cmd}}());
	};
}
usage();