Create docker files

dockerfile.rb

require 'fileutils'

module RailsBaseImages
  class Dockerfile
    attr_accessor :ruby_version, :additional_pkgs

    def initialize(attributes = {})
      attributes.each do |key, value|
        public_send("#{key}=", value)
      end
    end

    def render
      ERB.new(File.read("Dockerfile.erb")).result(binding)
    end

  end
end

  class DockerFilesCreator
    def config
      @config ||= YAML.load_file("images.yml")
    end

    def call
      config["images"].each do |image|
        puts "Createing docker file for #{image['name']}"
        docker_file_path = "#{image['name'].gsub!(':', '/')}"

        dockerfile = Dockerfile.new(
        ruby_version:    image["ruby_version"],
        additional_pkgs: image["additional_pkgs"],
        install_gems:    image["install_gems"],
        ).render

        begin
          FileUtils.mkdir_p(docker_file_path)
          File.open("#{docker_file_path}/Dockerfile", 'w') { |file| file.write(dockerfile) }
        rescue => e
          puts "Failed: #{e.inspect}"
        end
      end
    end
end