#!/usr/bin/perl

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

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

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

DO_CHECKS: {
	# If system version is NOT 10.1 or higher, show error
    if( !CheckVersion( $SYSTEM_VERS, "10.1", "ProductVersion", ">" )) 
	{
		$EXIT_VALUE = 1;
		last;
	}
	
	# If system version is NOT 10.3.8 or higher, show error
    if( CheckVersion( $SYSTEM_VERS, "10.3.8", "ProductVersion", "<" )) 
	{
        $EXIT_VALUE = ((1 << 6) | ( 1 << 5 ) | 16 );
		last;
	}
	
	# Must NOT be tier 3
	my $TIER_3_LANG = "/var/db/.AppleTier3Language";
	if (-e $TIER_3_LANG) {
		# return custom error
		$EXIT_VALUE = ( ( 1 << 6 ) | ( 1 << 5 ) | 19 );
		last;
    }

	# Get the IOregistry to see if this computer could possibly use the update.
    my $IOREG = `/usr/sbin/ioreg -l -w 0`;

	# Must be the right hardware
	# The output looks like this:     |   "model" = <"PowerMac8,1">
    unless (	$IOREG =~ /model.*<\"PowerMac7,2\">/ ||
		$IOREG =~ /model.*<\"PowerMac7,3\">/ ||
		$IOREG =~ /model.*<\"PowerMac9,1\">/ ||
		$IOREG =~ /model.*<\"PowerMac6,4\">/ ) {
		$EXIT_VALUE = ((1 << 6) | ( 1 << 5 ) | 17 );
		last;
    }
}
exit($EXIT_VALUE);

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

sub CheckVersion
{
    my $path            = $_[0];
    my $version         = $_[1];
    my $keyName         = $_[2];
    my $operator        = $_[3];
    my $i;
    my $oldSeperator;
    my $plistData;
    my @items;
    my $item;
    my @theVersionArray;
    my @versionArray;
    my %versiondata;

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

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

    $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;
    }

}
