#!/usr/bin/perl

my $SYSTEM_VERS = "/System/Library/CoreServices/SystemVersion.plist";
my $EXIT_VALUE = 0;

if ( $ENV{OS_INSTALL} == 1) {
	exit (0);
}

DO_CHECKS: {
	# 10.6.8 or higher system must be active
	if(CheckVersion("$SYSTEM_VERS", "10.6.8", "ProductVersion", "<")) {
		$EXIT_VALUE = ((1 << 6) | ( 1 << 5 ) | 17 );
		last;
	}
	# 10.6 system must be active
	if(CheckVersion("$SYSTEM_VERS", "10.6", "ProductVersion", "<")) {
		$EXIT_VALUE = ((1 << 6) | ( 1 << 5 ) | 18 );
		last;
	}
}
exit($EXIT_VALUE);

###

sub CheckVersion
{
    my $path            = $_[0];
    my $version         = $_[1];
    my $keyName         = $_[2];
    my $operator        = $_[3];

    if (! -e $path) {
        return 0;
    }

    if (!$operator) {
        $operator = "==";
    }

    my $oldSeperator = $/;
    $/ = \0;

    open( PLIST, "$path") || do {
        return 0;
    };

    $plistData = <PLIST>;
    $plistData =~ /<dict>(.*?)<\/dict>/gis;

    @items = split(/<key>/, $plistData);

    shift @items;
    foreach $item (@items) {
        $item =~ /(.*?)<\/key>.*?<string>(.*?)<\/string>/gis;
        $versiondata{ $1 } = $2;
    }

    close(PLIST);

    $/ = $oldSeperator;

    @theVersionArray = split(/\./, $versiondata{$keyName});
    for ($i = 0; $i < 3; $i++) {
        if(!$theVersionArray[$i]) {
            $theVersionArray[$i] = '0';
        }
    }

    @versionArray = split(/\./, $version);
    
    my $actualVersion;

    for ($i = 0; $i < 3; $i++) {
        if (($theVersionArray[$i] != $versionArray[$i]) or ($i == 2)) {

            $actualVersion = $theVersionArray[$i];
            $version = $versionArray[$i];

            last;
        }
    }

    my $expression = '$actualVersion ' . $operator . ' $version';
    if( eval ($expression) )
    {
        return 1;
    }
    else
    {
        return 0;
    }

}

sub CheckIOReg
{
        $RESULT = 0;

        open(IOREGOUT, "/usr/sbin/ioreg |");

        foreach $LINE (<IOREGOUT>) {
                $BUF .= $LINE;
        }
        close(IOREGOUT);

        foreach $ITEM (@_) {
                if($BUF =~ /$ITEM/g) {
                        $RESULT = 1;
                        last;
                }
        }

        return($RESULT);
}

