itunes-dist.xml

    <installation-check script='InstallationCheck()'/>
    <volume-check script='VolumeCheck()'/>
    <script>

    var gCurrentiTunesVersion = '11.0.2';
    var gPreviousiTunesVersion = '11.0.1';  // There is no patch for this release we will use the CurrentiTunesVersion value.
    var gOSMinimumVersion = '10.6.8';
	function installMobilitySupport()
    {
		if (system.files.fileExistsAtPath('/tmp/com.apple.mpkg.iTunes.noAMDS')){
		    return false;
		}

		return true;
    }

    function InstallationCheck()
    {
        // bypass this check if Software Update is running
        if ( system.applications.fromIdentifier('com.apple.SoftwareUpdate') ) {
            return true;
        }


        // no Tier 3 language support
        if ( volumeHasTier3() ) {
            my.result.title = system.localizedString('T_INST');
            my.result.message = system.localizedStringWithFormat('volumeHasTier3');
            my.result.type = 'Fatal';
            return false;
        }

        if(system.compareVersions(system.version.ProductVersion, gOSMinimumVersion) == -1) {
            my.result.title = system.localizedString('T_INST');
            my.result.message = system.localizedStringWithFormat('OS_VER_ERR');
            my.result.type = 'Fatal';
            return false;
        }

        return true;
    }

    function VolumeCheck() {
		if(system.compareVersions(my.target.systemVersion.ProductVersion, gOSMinimumVersion) == -1) {
			my.result.message = system.localizedString('OS_VER_ERR');
			my.result.type = 'Fatal';
			return false;
		}

        // do not downgrade
        var plist = system.files.plistAtPath("/Applications/iTunes.app/Contents/Info.plist");
        if ( !plist || plist.CFBundleShortVersionString &amp;&amp; (system.compareVersions(plist.CFBundleShortVersionString, gCurrentiTunesVersion) != 1) ) {
            return true;
        }

        my.result.message = system.localizedStringWithFormat('isDowngrade');
        my.result.type = 'Fatal';
        return false;
    }

    function volumeHasTier3()
    {
			var appleLanguages = system.defaults['AppleLanguages'];

			if(!appleLanguages || (appleLanguages.length == 0))
			  return false;

			if (appleLanguages[0] == 'pl')
			{
			  system.log("Polish language found");
			  return false;
			}

			return (system.files.fileExistsAtPath("/var/db/.AppleTier3Language"));
    }

    function isServer()
    {
        return (system.files.fileExistsAtPath("/System/Library/CoreServices/ServerVersion.plist"));
    }

    function ShouldAutoUpdate()
    {
        if ( volumeHasTier3() )
            return false;

		// Fail on G3
		if (1 != system.sysctl('hw.vectorunit') ) {
			return false;
		}

        return (volumeNeedsiTunesUpdated());
    }

    function volumeNeedsiTunesUpdated() {
		var plist = system.files.plistAtPath(my.target.mountpoint + "/System/Library/PrivateFrameworks/iTunesAccess.framework/Versions/A/Resources/version.plist");
    	if ( !plist ) return true;

    	var version = plist.CFBundleShortVersionString;
		if ( !version || (-1 == system.compareVersions(version, gPreviousiTunesVersion)) ) return true;

		// exception for leopard and moved apps
		// we dont want to patch those

		var moved = !system.files.fileExistsAtPath(my.target.mountpoint + "/Applications/iTunes.app/Contents/Info.plist");
		var isNotSnow = system.compareVersions(my.target.systemVersion.ProductVersion, '10.6') == -1;
		if ((moved || isNotSnow) &amp;&amp; (-1 == system.compareVersions(version, gCurrentiTunesVersion))){
			return true;
		}

		return false;
    }


	function checkBuildVersion(arg_volume, arg_version)
	{
		if (arg_volume == '/' || arg_volume == '') {
			return (system.compareVersions(system.version.ProductBuildVersion, arg_version));
		} else {
			return (system.compareVersions(my.target.systemVersion.ProductBuildVersion, arg_version));
		}
	}

    </script>