package run_program; # $Id$

use diagnostics;
use strict;
use c;

use MDK::Common;
use log;

1;

sub run_or_die {
    my ($name, @args) = @_;
    run($name, @args) or die "$name failed\n";
}
sub rooted_or_die {
    my ($root, $name, @args) = @_;
    rooted($root, $name, @args) or die "$name failed\n";
}

sub get_stdout {
    my ($name, @args) = @_;
    my @r;
    run($name, '>', \@r, @args) or return;
    wantarray() ? @r : join('', @r);
}
sub rooted_get_stdout {
    my ($root, $name, @args) = @_;
    my @r;
    rooted($root, $name, '>', \@r, @args) or return;
    wantarray() ? @r : join('', @r);
}

sub run { raw({}, @_) }

sub rooted {
    my ($root, $name, @args) = @_;
    raw({ root => $root }, $name, @args);
}

sub raw {
    my ($options, $name, @args) = @_;
    my $root = $options->{root} || '';
    my $real_name = ref($name) ? $name->[0] : $name;

    my ($stdout_raw, $stdout_mode, $stderr_raw, $stderr_mode);
    ($stdout_mode, $stdout_raw, @args) = @args if $args[0] =~ /^>>?$/;
    ($stderr_mode, $stderr_raw, @args) = @args if $args[0] =~ /^2>>?$/;

    my $args = $options->{sensitive_arguments} ? '<hidden arguments>' : join(' ', @args);
    log::explanations("running: $real_name $args" . ($root ? " with root $root" : ""));

    return if $root && $<;

    $root ? ($root .= '/') : ($root = '');
    
    my $tmpdir = sub {
	my $dir = $< != 0 ? "$ENV{HOME}/tmp" : -d '/root' ? '/root/tmp' : '/tmp';
	-d $dir or mkdir($dir, 0700);
	$dir;
    };
    my $stdout = $stdout_raw && (ref($stdout_raw) ? $tmpdir->() . "/.drakx-stdout.$$" : "$root$stdout_raw");
    my $stderr = $stderr_raw && (ref($stderr_raw) ? $tmpdir->() . "/.drakx-stderr.$$" : "$root$stderr_raw");

    #- checking if binary exist to avoid cloberring stdout file
    my ($rname) = $real_name =~ /(.*?)[\s\|]/;    
    if (! ($rname =~ m!^/! 
	     ? -x "$root$rname" || $root && -l "$root$rname" #- handle non-relative symlink which can be broken when non-rooted
	     : whereis_binary($rname, $root))) {
	log::l("program not found: $real_name");
	return;
    }

    if (my $pid = fork()) {
	if ($options->{detach}) {
	    $pid;
	} else {
	    my $ok;
	    eval {