module ChefConfig::Mixin::TrainTransport

def load_credentials(profile)
  # Tomlrb.load_file returns a hash with keys as strings
  credentials = parse_credentials_file
  if contains_split_fqdn?(credentials, profile)
    logger.warn("Credentials file #{credentials_file_path} contains target '#{profile}' as a Hash, expected a string.")
    logger.warn("Hostnames must be surrounded by single quotes, e.g. ['host.example.org']")
  end
  # host names must be specified in credentials file as ['foo.example.org'] with quotes
  if !credentials.nil? && !credentials[profile].nil?
    credentials[profile].transform_keys(&:to_sym) # return symbolized keys to match Train.options()
  else
    nil
  end
end