code: func (c *Client) SetupAuthFromString(a string) error {
  	// TODO(mpl): review the one using that (pkg/blobserver/remote/remote.go)
  	var err error
  	c.authMode, err = auth.FromConfig(a)
  	return err
  }
docs: // SetupAuthFromString configures the clients authentication mode from
  // an explicit auth string.