// GetConfigKey retrieves only the value of a particular key.
func (r *FSRepo) GetConfigKey(key string) (interface{}, error) {
	packageLock.Lock()
	defer packageLock.Unlock()

	if r.closed {
		return nil, errors.New("repo is closed")
	}

	filename, err := config.Filename(r.path)
	if err != nil {
		return nil, err
	}
	var cfg map[string]interface{}
	if err := serialize.ReadConfigFile(filename, &cfg); err != nil {
		return nil, err
	}
	return common.MapGetKV(cfg, key)
}

// SetConfigKey writes the value of a particular key.
func (r *FSRepo) SetConfigKey(key string, value interface{}) error {
	packageLock.Lock()
	defer packageLock.Unlock()

	if r.closed {
		return errors.New("repo is closed")
	}

	filename, err := config.Filename(r.path)
	if err != nil {
		return err
	}
	var mapconf map[string]interface{}
	if err := serialize.ReadConfigFile(filename, &mapconf); err != nil {
		return err
	}

	// Get the type of the value associated with the key
	oldValue, err := common.MapGetKV(mapconf, key)
	ok := true
	if err != nil {
		// key-value does not exist yet
		switch v := value.(type) {
		case string:
			value, err = strconv.ParseBool(v)
			if err != nil {
				value, err = strconv.Atoi(v)
				if err != nil {
					value, err = strconv.ParseFloat(v, 32)
					if err != nil {
						value = v
					}
				}
			}
		default:
		}
	} else {
		switch oldValue.(type) {
		case bool:
			value, ok = value.(bool)
		case int:
			value, ok = value.(int)
		case float32:
			value, ok = value.(float32)
		case string:
			value, ok = value.(string)
		default:
			value = value
		}
		if !ok {
			return fmt.Errorf("Wrong config type, expected %T", oldValue)
		}
	}

	if err := common.MapSetKV(mapconf, key, value); err != nil {
		return err
	}

	// This step doubles as to validate the map against the struct
	// before serialization
	conf, err := config.FromMap(mapconf)
	if err != nil {
		return err
	}
	if err := serialize.WriteConfigFile(filename, mapconf); err != nil {
		return err
	}
	return r.setConfigUnsynced(conf) // TODO roll this into this method
}