refs #189: set config dir based on XDG Base Directory Specification

cmd/root.go

@@ -57,14 +57,7 @@ func Execute() {
 func init() {
 	cobra.OnInitialize(initConfig)
 
-	// Here you will define your flags and configuration settings.
-	// Cobra supports persistent flags, which, if defined here,
-	// will be global for your application.
-	// rootCmd.PersistentFlags().StringVar(&cfgFile, "config", "", "config file (default is $HOME/.hetzner-kube.yaml)")
-
-	// Cobra also supports local flags, which will only run
-	// when this action is called directly.
-	// rootCmd.Flags().BoolP("toggle", "t", false, "Help message for toggle")
+	rootCmd.PersistentFlags().StringVar(&cfgFile, "config", "", "config file to use")
 	rootCmd.PersistentFlags().BoolP("debug", "d", false, "debug mode")
 }
 
@@ -74,23 +67,41 @@ func initConfig() {
 		// Use config file from the flag.
 		viper.SetConfigFile(cfgFile)
 	} else {
-		// Find home directory.
-		home, err := homedir.Dir()
-		if err != nil {
-			fmt.Println(err)
-			os.Exit(1)
-		}
-
-		// Search config in home directory with name ".hetzner-kube" (without extension).
-		viper.AddConfigPath(home)
-		viper.SetConfigName(".hetzner-kube")
-
+		setConfigDirectory()
 	}
 
-	viper.AutomaticEnv() // read in environment variables that match
+	// read in environment variables that match
+	viper.AutomaticEnv()
 
 	// If a config file is found, read it in.
 	if err := viper.ReadInConfig(); err == nil {
 		fmt.Println("Using config file:", viper.ConfigFileUsed())
 	}
 }
+
+func setConfigDirectory() {
+	// Find config dir based on XDG Base Directory Specification
+	// https://specifications.freedesktop.org/basedir-spec/basedir-spec-latest.html
+	xdgConfig := os.Getenv("XDG_CONFIG_HOME")
+	if xdgConfig != "" {
+		viper.AddConfigPath(xdgConfig)
+	}
+
+	// Failback to home directory
+	home, err := homedir.Dir()
+	if err != nil {
+		fmt.Println(err)
+	}
+
+	if err == nil {
+		viper.AddConfigPath(home)
+	}
+
+	if xdgConfig == "" && err != nil {
+		fmt.Println("Unable to detect any config location, please specify it with --config flag")
+		os.Exit(1)
+	}
+
+	// Search config directory with name ".hetzner-kube" (without extension).
+	viper.SetConfigName(".hetzner-kube")
+}