package urpm::parallel_ka_run;

# $Id$

#- Copyright (C) 2002, 2003, 2004, 2005 MandrakeSoft SA
#- Copyright (C) 2005 Mandriva SA

use strict;
use urpm::util;
use urpm::msg;
use urpm::parallel;

our @ISA = 'urpm::parallel';

(our $VERSION) = q($Revision$) =~ /(\d+)/;
our $mput_command = $ENV{URPMI_MPUT_COMMAND};
our $rshp_command = $ENV{URPMI_RSHP_COMMAND};

if (!$mput_command) {
    ($mput_command) = grep { -x $_ } qw(/usr/bin/mput2 /usr/bin/mput);
}
$mput_command ||= 'mput';
if (!$rshp_command) {
    ($rshp_command) = grep { -x $_ } qw(/usr/bin/rshp2 /usr/bin/rshp);
}
$rshp_command ||= 'rshp';

sub _rshp_urpm {
    my ($parallel, $urpm, $rshp_option, $cmd, $para) = @_;

    my $command = "$rshp_command $rshp_option $parallel->{options} -- $cmd --no-locales $para";
    $urpm->{log}("parallel_ka_run: $command");
    $command;
}
sub _rshp_urpm_popen {
    my ($parallel, $urpm, $cmd, $para) = @_;

    my $command = _rshp_urpm($parallel, $urpm, '-v', $cmd, $para);
    open(my $fh, "$command |") or $urpm->{fatal}(1, "Can't fork $rshp_command: $!");
    $fh;
}

sub urpm_popen {
    my ($parallel, $urpm, $cmd, $para, $do) = @_;

    my $fh = _rshp_urpm_popen($parallel, $urpm, $cmd, $para);

    while (my $s = <$fh>) {
	chomp $s;
	my ($node, $s_) = _parse_rshp_output($s) or next;

	$do->($node, $s_) or last;
    }
    close $fh or $urpm->{fatal}(1, N("rshp failed, maybe a node is unreacheable"));
}

sub copy_to_dir { &_run_mput }

sub _run_mput {
    my ($parallel, $urpm, @para) = @_;

    my @l = (split(' ', $parallel->{options}), '--', @para);
    $urpm->{log}("parallel_ka_run: $mput_command " . join(' ', @l));
    system $mput_command, @l;
    $? == 0 || $? == 256 or $urpm->{fatal}(1, N("mput failed, maybe a node is unreacheable"));
}    

#- parallel resolve_dependencies
sub parallel_resolve_dependencies {
    my ($parallel, $synthesis, $urpm, $state, $requested, %options) = @_;

    #- first propagate the synthesis file to all machines
    _run_mput($parallel, $urpm, $synthesis, $synthesis);

    $parallel->{synthesis} = $synthesis;

    my $line = urpm::parallel::simple_resolve_dependencies($parallel, $urpm, $state, $requested, %options);

    #- execute urpmq to determine packages to install.
    my ($cont, %chosen);
    do {
	$cont = 0; #- prepare to stop iteration.
	#- the following state should be cleaned for each iteration.
	delete $state->{selected};
	#- now try an iteration of urpmq.
	$parallel->urpm_popen($urpm, 'urpmq', "--synthesis $synthesis -fduc $line " . join(' ', keys %chosen), sub {
	    my ($node, $s) = @_;
	    urpm::parallel::parse_urpmq_output($urpm, $state, $node, $s, \$cont, \%chosen, %options);
	});
	#- check for internal error of resolution.
	$cont == 1 and die "internal distant urpmq error on choice not taken";
    } while $cont;

    #- keep trace of what has been chosen finally (if any).
    $parallel->{line} = join(' ', $line, keys %chosen);
}

#- parallel install.
sub parallel_install {
    my ($parallel, $urpm, undef, $install, $upgrade, %options) = @_;

    copy_to_dir($parallel, $urpm, values %$install, values %$upgrade, "$urpm->{cachedir}/rpms/");

    my (%bad_nodes);
    $parallel->urpm_popen($urpm, 'urpmi', "--pre-clean --test --no-verify-rpm --auto --synthesis $parallel->{synthesis} $parallel->{line}", sub {
	my ($node, $s) = @_;
	$s =~ /^\s*$/ and return;
	$bad_nodes{$node} .= $s;
	$s =~ /Installation failed/ and $bad_nodes{$node} = '';
	$s =~ /Installation is possible/ and delete $bad_nodes{$node};
    });

    foreach (keys %{$parallel->{nodes}}) {
	exists $bad_nodes{$_} or next;
	$urpm->{error}(N("Installation failed on node %s", $_) . ":\n" . $bad_nodes{$_});
    }
    %bad_nodes and return;

    if ($options{test}) {
	$urpm->{error}(N("Installation is possible"));
	1;
    } else {
	my $line = $parallel->{line} . ($options{excludepath} ? " --excludepath '$options{excludepath}'" : "");
	#- continue installation.
	system(_rshp_urpm($parallel, $urpm, '', 'urpmi', "--no-verify-rpm --auto --synthesis $parallel->{synthesis} $line")) == 0;
    }
}

sub _parse_rshp_output {
    my ($s) = @_;
    #- eg of output of rshp2: <tata2.mandriva.com> [rank:2]:@removing@mpich-1.2.5.2-10mlcs4.x86_64

    if ($s =~ /<([^>]*)>.*:->:(.*)/ || $s =~ /<([^>]*)>\s*\[[^]]*\]:(.*)/) {
	($1, $2);
    } else { 
	warn "bad rshp output $s\n";
	();
    }
}

#- allow to bootstrap from urpmi code directly (namespace is urpm).

package urpm;

no warnings 'redefine';

sub handle_parallel_options {
    my (undef, $options) = @_;
    my ($media, $ka_run_options) = $options =~ /ka-run(?:\(([^\)]*)\))?:(.*)/;
    if ($ka_run_options) {
	my ($flush_nodes, %nodes);
	foreach (split ' ', $ka_run_options) {
	    if ($_ eq '-m') {
		$flush_nodes = 1;
	    } else {
		$flush_nodes and $nodes{/host=([^,]*)/ ? $1 : $_} = undef;
		undef $flush_nodes;
	    }
	}
	return bless {
	    media   => $media,
	    options => $ka_run_options,
	    nodes   => \%nodes,
	}, "urpm::parallel_ka_run";
    }
    return undef;
}

1;