#!/usr/bin/perl

####################################################################################

my $SYSTEM_VERS = "$ARGV[0]"."/System/Library/CoreServices/SystemVersion.plist";
my $TARGET_VOLUME = "$ARGV[0]";
my $EXIT_VALUE = 0;

####################################################################################

DO_CHECKS: {
	if( ! -e "$SYSTEM_VERS" ) {
		$EXIT_VALUE = (( 1 << 5 ) | 16 );
		last;
	}

	if( CheckVersion("$SYSTEM_VERS", "10.2.5", "ProductVersion", "<" )) {
		$EXIT_VALUE = (( 1 << 5 ) | 16 );
		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;

    # ProductBuildVersion style keys
    $versiondata{$keyName} =~ /(\d+)([A-Z])(\d+)/ && ($versiondata{$keyName} = "$1.".ord($2).".$3");
    $version =~ /(\d+)([A-Z])(\d+)/ && ($version = "$1.".ord($2).".$3");

    @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;
    }

}

