Support to read parameters from system ENV

godns.go

@@ -64,11 +64,27 @@ func main() {
 		return
 	}
 
+	if *optDocker {
+		//Load settings from ENV
+		configuration = Settings{
+			Email:      os.Getenv("EMAIL"),
+			Password:   os.Getenv("PASSWORD"),
+			LoginToken: os.Getenv("TOKEN"),
+			Domain:     os.Getenv("DOMAIN"),
+			Sub_domain: os.Getenv("SUB_DOMAIN"),
+			IP_Url:     "http://members.3322.org/dyndns/getip",
+			Log_Path:   "./godns.log",
+			Log_Size:   16,
+			Log_Num:    3,
+		}
+	} else {
+		//Load settings from configurations file
 		if err := LoadSettings(*optConf, &configuration); err != nil {
 			fmt.Println(err.Error())
 			log.Println(err.Error())
 			os.Exit(1)
 		}
+	}
 
 	if err := InitLogger(configuration.Log_Path, configuration.Log_Size, configuration.Log_Num); err != nil {
 		log.Println("InitLogger error:", err)

settings.go

@@ -17,21 +17,18 @@ type Settings struct {
 	Log_Path   string
 	Log_Size   int
 	Log_Num    int
-	User       int
-	Group      int
 }
 
 //LoadSettings -- Load settings from config file
 func LoadSettings(configPath string, settings *Settings) error {
 	//LoadSettings from config file
-	setting := Settings{}
 	file, err := ioutil.ReadFile(configPath)
 	if err != nil {
 		fmt.Println("Error occurs while reading config file, please make sure config file exists!")
 		return err
 	}
 
-	err = json.Unmarshal(file, &setting)
+	err = json.Unmarshal(file, settings)
 	if err != nil {
 		fmt.Println("Error occurs while unmarshal config file, please make sure config file correct!")
 		return err