def valid_paths?
      paths = options[:cookbook_paths] + options[:role_paths] +
        options[:environment_paths]
      paths.any? && paths.all? { |path| File.exist?(path) }
    end
def valid_paths?
      paths = options[:cookbook_paths] + options[:role_paths] +
        options[:environment_paths]
      paths.any? && paths.all? { |path| File.exist?(path) }
    end
If the paths provided are valid

 @return [Boolean] True if the paths exist.