fix tmp dir permissions crash

src/system.go

@@ -141,7 +141,11 @@ func loadSettings() (settings SettingsStruct, err error) {
 	defaults["udpxy"] = ""
 	defaults["version"] = System.DBVersion
 	defaults["xteveAutoUpdate"] = true
-	defaults["temp.path"] = System.Folder.Temp
+	var defaultTempPath = System.Folder.Temp
+	if len(os.Getenv("XTEVE_CONFIG")) > 0 {
+		defaultTempPath = System.Folder.Config + "tmp" + string(os.PathSeparator)
+	}
+	defaults["temp.path"] = defaultTempPath
 
 	// Default Werte setzen
 	for key, value := range defaults {
@@ -209,8 +213,26 @@ func saveSettings(settings SettingsStruct) (err error) {
 		settings.UserAgent = defaultUserAgent
 	}
 
+	settings.TempPath = strings.TrimRight(settings.TempPath, string(os.PathSeparator)) + string(os.PathSeparator)
 	System.Folder.Temp = settings.TempPath + settings.UUID + string(os.PathSeparator)
 
+	err = checkFolder(System.Folder.Temp)
+	if err != nil {
+
+		fallbackTempPath := System.Folder.Config + "tmp" + string(os.PathSeparator)
+		fallbackTempFolder := fallbackTempPath + settings.UUID + string(os.PathSeparator)
+		fallbackErr := checkFolder(fallbackTempFolder)
+
+		if fallbackErr != nil {
+			return err
+		}
+
+		settings.TempPath = fallbackTempPath
+		System.Folder.Temp = fallbackTempFolder
+		showInfo(fmt.Sprintf("Temporary Folder:Fallback to %s", getPlatformPath(System.Folder.Temp)))
+
+	}
+
 	err = writeByteToFile(System.File.Settings, []byte(mapToJSON(settings)))
 	if err != nil {
 		return