code: func FindSource(location string, home helmpath.Home) (Installer, error) {
  	installer, err := existingVCSRepo(location, home)
  	if err != nil && err.Error() == "Cannot detect VCS" {
  		return installer, errors.New("cannot get information about plugin source")
  	}
  	return installer, err
  }
docs: // FindSource determines the correct Installer for the given source.