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

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_index($)
{
	my $name = shift;

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

	if (-d "./feeds/$name/.svn" ) {
		system("(cd \"./feeds/$name\"; svn up)") == 0 or return 1;
	} else {
		system("rm -rf \"./feeds/$name\"");
		system("svn co $src \"./feeds/$name\"") == 0 or return 1;
	}

	return 0;
}

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

	system("mkdir -p ./feeds/$name");
	system("cp -Rf $src ./feeds");

	return 0;
}

sub update_link($$) {
	my $name = shift;
	my $src = abs_path(shift);

	system("rm -f ./feeds/$name; ln -s $src ./feeds/$name");

	return 0;
}

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

	if (-d "./feeds/$name/.git" ) {
		system("GIT_DIR=./feeds/$name/.git git pull") == 0 or return 1;
	} else {
		system("rm -rf \"./feeds/$name\"");
		system("git-clone --depth 1 $src ./feeds/$name") == 0 or return 1;
	}

	return 0;
}

sub get_feed($) {
	my $feed = shift;
	my $file = "./feeds/$feed.index";

	clear_packages();

	-f $file or do {
		print "Ignoring feed '$feed' - index missing\n";
		return;
	};
	parse_package_metadata($file) 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 list_feed {
	my $feed = shift;

	get_feed($feed);
	foreach my $name (sort { lc($a) cmp lc($b) } keys %package) {
		my $pkg = $package{$name};
		if($pkg->{name}) {
			printf "\%-32s\t\%s\n", $pkg->{name}, $pkg->{title};
		}
	}

	return 0;
}

sub list {
	my %opts;

	getopts('r:sh', \%opts);
	if ($opts{h}) {
		usage();
		return 0;
	}
	if ($opts{s}) {
		foreach my $feed (@feeds) {
			printf "\%-32s\tURL: %s\n", $feed->[1], $feed->[2];
		}
		return 0;
	}
	foreach my $feed (@feeds) {
		list_feed($feed->[1], @ARGV) if (!defined($opts{r}) or $opts{r} eq $feed->[1]);
	}
	return 0;
}

sub install_generic() {
	my $feed = shift;
	my $pkg = shift;
	my $path = $pkg->{makefile};

	if($path) {
		$path =~ s/\/Makefile$//;

		-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]/");
	} else {
		warn "Package is not valid\n";
		return 1;
	}

	return 0;
}

my %install_method = (
	'src-svn' => \&install_generic,
	'src-cpy' => \&install_generic,
	'src-link' => \&install_generic,
	'src-git' => \&install_generic,
);

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;
		# TODO: check if it's already installed within ./package directory
		warn "WARNING: No feed for package '$name' found, maybe it's already part of the standard packages?\n";
		return 0;
	};

	my $pkg = $feed{$feed->[1]}->{$name} or return 1;
	$pkg->{name} or do {
		$installed{$name} and return 0;
		# TODO: check if this is an alias package, maybe it's known by another name
		warn "WARNING: Package '$name' is not available in feed $feed->[1].\n";
		return 0;
	};
	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;

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

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

sub install {
	my $name;
	my %opts;
	my $feed;
	my $ret = 0;

	getopts('ap:d:h', \%opts);

	if ($opts{h}) {
		usage();
		return 0;
	}

	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;
	}

	if($opts{a}) {
		foreach my $f (@feeds) {
			if (!defined($opts{p}) or $opts{p} eq $f->[1]) {
				printf "Installing all packages from feed %s.\n", $f->[1];
				get_feed($f->[1]);
				foreach my $name (sort { lc($a) cmp lc($b) } keys %package) {
					my $p = $package{$name};
					if( $p->{name} ) {
						install_package($feed, $p->{name}) == 0 or $ret = 1;
					}
				}
			}
		}
	} else {
		while ($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 %opts;
	my $name;
	my $uninstall;

	getopts('ah', \%opts);

	if ($opts{h}) {
		usage();
		return 0;
	}

	if ($opts{a}) {
		system("rm -rvf ./package/feeds");
		$uninstall = 1;
	} else {
		if($#ARGV == -1) {
			warn "WARNING: no package to uninstall\n";
			return 0;
		}
		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;
}

my %update_method = (
	'src-svn' => \&update_svn,
	'src-cpy' => \&update_cpy,
	'src-link' => \&update_link,
	'src-git' => \&update_git
);

sub update_feed($$$$)
{
	my $type=shift;
	my $name=shift;
	my $src=shift;
	my $perform_update=shift;

	$update_method{$type} or do {
		warn "Unknown type '$type' in feed $name\n";
		return 1;
	};
	$perform_update and do {
		warn "Updating feed '$name' from '$src' ...\n";
		&{$update_method{$type}}($name, $src) == 0 or do {
			warn "failed.\n";
			return 1;
		};
	};
	warn "Create index file './feeds/$name.index' \n";
	update_index($name) == 0 or do {
		warn "failed.\n";
		return 1;
	};
	return 0;
}

sub update {
	my %opts;
	my $feed_name;
	my $perform_update=1;

	$ENV{SCAN_COOKIE} = $$;
	$ENV{KBUILD_VERBOSE} = 99;

	getopts('ahi', \%opts);

	if ($opts{h}) {
		usage();
		return 0;
	}

	if ($opts{i}) {
		# don't update from (remote) repository
		# only re-create index information
		$perform_update=0;
	}

	-d "feeds" or do {
			mkdir "feeds" or die "Unable to create the feeds directory";
		};

	if ( ($#ARGV == -1) or $opts{a}) {
		foreach my $feed (@feeds) {
			my ($type, $name, $src) = @$feed;
			update_feed($type, $name, $src, $perform_update);
		}
	} else {
		while ($feed_name = shift @ARGV) {
			foreach my $feed (@feeds) {
				my ($type, $name, $src) = @$feed;
				if($feed_name ne $name) {
					next;
				}
				update_feed($type, $name, $src, $perform_update);
			}
		}
	}

	refresh_config();

	return 0;
}

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

Commands:
	list [options]: List feeds and their content
	Options:
	    -s :           List of feed names and their URL.
	    -r <feedname>: List packages of specified feed.

	install [options] <package>: Install a package
	Options:
	    -a :           Install all packages from all feeds or from the specified feed using the -p option.
	    -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
	Options:
	    -a :           Uninstalls all packages.

	update -a|<feedname(s)>: Update packages and lists of feeds in feeds.conf .
	Options:
	    -a :           Update all feeds listed within feeds.conf. Otherwise the spezified feeds will be updated.
	    -i :           Recreate the index only. No feed update from repository is performed.

	clean:             Remove downloaded/generated files.

EOF
	exit(1);
}

my %commands = (
	'list' => \&list,
	'update' => \&update,
	'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();