code: func (c *fileStore) Get(serverAddress string) (types.AuthConfig, error) {
  	authConfig, ok := c.file.GetAuthConfigs()[serverAddress]
  	if !ok {
  		// Maybe they have a legacy config file, we will iterate the keys converting
  		// them to the new format and testing
  		for r, ac := range c.file.GetAuthConfigs() {
  			if serverAddress == ConvertToHostname(r) {
  				return ac, nil
  			}
  		}
  
  		authConfig = types.AuthConfig{}
  	}
  	return authConfig, nil
  }
docs: // Get retrieves credentials for a specific server from the file store.