"authority":           env.Register("ISTIOCTL_AUTHORITY", "", "The istioctl --authority override"),
	"cert-dir":            env.Register("ISTIOCTL_CERT_DIR", "", "The istioctl --cert-dir override"),
	"insecure":            env.Register("ISTIOCTL_INSECURE", false, "The istioctl --insecure override"),

	}

	// Allow users to override some variables through $HOME/.istioctl/config.yaml
	// and environment variables.
	viper.SetEnvPrefix("ISTIOCTL")
	viper.AutomaticEnv()
	viper.AllowEmptyEnv(true) // So we can say ISTIOCTL_CERT_DIR="" to suppress certs
	viper.SetConfigName(configName)
	viper.SetConfigType(configType)
	viper.AddConfigPath(configPath)
	viper.SetEnvKeyReplacer(strings.NewReplacer("-", "_"))
	err := viper.ReadInConfig()