Class: Sle2Docker::Builder

Inherits:
Object
  • Object
show all
Defined in:
lib/sle2docker/builder.rb

Instance Method Summary collapse

Constructor Details

#initialize(options) ⇒ Builder

Returns a new instance of Builder.



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# File 'lib/sle2docker/builder.rb', line 4

def initialize(options)
  @options = options
end

Instance Method Details

#create(template_dir) ⇒ String

Creates the actual Docker image using kiwi

Parameters:

  • template_dir (String)

Returns:

  • (String) —

    path to the image created by kiwi



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# File 'lib/sle2docker/builder.rb', line 12

def create(template_dir)
  tmp_dir          = Dir.mktmpdir("sle2docker")
  tmp_template_dir = File.join(tmp_dir, "template")
  result_dir       = File.join(tmp_dir, "result")

  FileUtils.cp_r(File.join(template_dir, "."), tmp_template_dir)
  FileUtils.mkdir_p(result_dir)

  template_file = find_template_file(tmp_template_dir)
  if template_file.end_with?('.erb')
    template = render_template(template_file)
    File.open(File.join(tmp_template_dir, "config.xml"), "w") do |file|
      file.write(template)
    end
  end

  docker_cmd = "docker run --rm "
  # dns entries - otherwise docker uses Google's DNS
  dns_entries.each do |entry|
    docker_cmd += "--dns=#{entry} "
  end
  # the HTTP proxy specified by the user
  if @options[:http_proxy]
    docker_cmd += "-e http_proxy=#{@options[:http_proxy]} "
  end
  # ensure kiwi cache is persistent
  docker_cmd += "-v /var/cache/kiwi:/var/cache/kiwi "
  # share build dir
  docker_cmd += "-v #{tmp_dir}:/#{tmp_dir} "
  # required because kiwi needs to bind mount /proc while creating the image
  docker_cmd += "--privileged "
  # the image to use
  docker_cmd += "opensuse/kiwi "
  # kiwi directives
  docker_cmd += "--build #{tmp_template_dir} --type docker -d #{result_dir}"
  begin
    puts "Starting build process inside of Docker container"
    if !system(docker_cmd)
      $stderr.printf("Something wrong happened during the build process\n")
      exit(1)
    end
  end
  Dir[File.join(result_dir, "*.tbz")].first
end

#dns_entries ⇒ Object 



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# File 'lib/sle2docker/builder.rb', line 111

def dns_entries
  File.open('/etc/resolv.conf', 'r') do |file|
    file.readlines("\n").grep(/\Anameserver\s+/).map{|l| l.split(" ", 2)[1].strip}
  end
end

#find_template_file(template_dir) ⇒ String

Looks for either config.xml or config.xml.erb inside of the template directory.

Exits with an error if no file is found.

Parameters:

  • template_dir (String)

Returns:

  • (String) —

    full path to the template file



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# File 'lib/sle2docker/builder.rb', line 64

def find_template_file(template_dir)
  template_file = File.join(template_dir, 'config.xml.erb')

  if !File.exist?(template_file)
    raise ConfigNotFoundError.new("Cannot find config.xml.erb file inside of #{template_dir}")
  end

  template_file
end

#render_template(template_file) ⇒ String

Performs the rendering of config.xml.erb

Parameters:

  • template_file (String)

Returns:

  • (String) —

    rendered template



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# File 'lib/sle2docker/builder.rb', line 78

def render_template(template_file)
  host = if @options[:smt_host]
    @options[:smt_host]
  else
    "nu.novell.com"
  end

  username = @options[:username]
  if !username && (!@options[:password].empty? || !@options[:smt_host])
    puts "Enter #{@options[:smt_host] ? '' : 'NCC '}username:"
    username = $stdin.gets.chomp
  end

  password = @options[:password]
  if (username || !@options[:smt_host]) && password.empty?
    puts "Enter #{@options[:smt_host] ? '' : 'NCC '}password:"
    password = $stdin.noecho(&:gets).chomp
  end

  credentials = ""
  if username || !password.empty?
    credentials = "username='#{username}' password='#{password}'"
  end

  use_ncc = !@options[:smt_host]

  enable_https = !@options[:disable_https]

  include_build_repos = @options[:include_build_repositories]

  ERB.new(File.read(template_file)).result(binding)
end