You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: config.rb
    path of file: ./repos/tugboat/lib/tugboat
    
    the code of the file until where you have to start completion: require 'singleton'

module Tugboat
  # This is the configuration object. It reads in configuration
  # from a .tugboat file located in the user's home directory

  class Configuration
    include Singleton
    attr_reader :data
    attr_reader :path

    FILE_NAME = '.tugboat'.freeze
    DEFAULT_SSH_KEY_PATH = '.ssh/id_rsa'.freeze
    DEFAULT_SSH_PORT = '22'.freeze
    DEFAULT_REGION = 'nyc2'.freeze
    DEFAU
    
    def create_config_file(access_token, ssh_key_path, ssh_user, ssh_port, region, image, size, ssh_key, private_networking, backups_enabled, ip6, timeout)
      # Default SSH Key path
      ssh_key_path = File.join('~', DEFAULT_SSH_KEY_PATH) if ssh_key_path.empty?

      ssh_user = 'root' if ssh_user.empty?

      ssh_port = DEFAULT_SSH_PORT if ssh_port.empty?

      region = DEFAULT_REGION if region.empty?

      image = DEFAULT_IMAGE if image.empty?

      size = DEFAULT_SIZE if size.empty?

      default_ssh_key = DEFAULT_SSH_KEY if ssh_key.empty?

      if private_networking.empty?
        private_networking = DEFAULT_PRIVATE_NETWORKING
      end