Class: Sle2Docker::RootFSImage

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

Overview

This class takes care of handling the pre-build images for SUSE Linux Enterprise

Constant Summary collapse

IMAGES_DIR = 
'/usr/share/suse-docker-images'.freeze
DOCKERFILE_TEMPLATE = 
File.join(
  File.expand_path('../../templates/docker_build', __FILE__),
  'dockerfile.erb'
)

Instance Attribute Summary

Attributes inherited from Image

#image_id

Class Method Summary collapse

Instance Method Summary collapse

Methods inherited from Image

#activated?, #check_image_exists, #rpm_package_name, #verify_image

Constructor Details

#initialize(image_name, options) ⇒ RootFSImage

Returns a new instance of RootFSImage.



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# File 'lib/sle2docker/rootfs_image.rb', line 21

def initialize(image_name, options)
  @image_name = image_name
  @options    = options
  compute_repository_and_tag
end

Class Method Details

.list ⇒ Object 



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# File 'lib/sle2docker/rootfs_image.rb', line 11

def self.list
  if File.exist?(RootFSImage::IMAGES_DIR)
    Dir[File.join(RootFSImage::IMAGES_DIR, '*.tar.xz')].map do |image|
      File.basename(image, '.tar.xz')
    end
  else
    []
  end
end

Instance Method Details

#activate ⇒ Object 



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# File 'lib/sle2docker/rootfs_image.rb', line 27

def activate
  verify_image

  tmp_dir = prepare_docker_build_root
  puts 'Activating image'
  image = Docker::Image.build_from_dir(tmp_dir)
  image.tag('repo' => @repository, 'tag' => @tag)
  image.tag('repo' => @repository, 'tag' => 'latest')
ensure
  FileUtils.rm_rf(tmp_dir) if tmp_dir && File.exist?(tmp_dir)
end

#copy_prebuilt_image(tmp_dir) ⇒ Object 



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# File 'lib/sle2docker/rootfs_image.rb', line 57

def copy_prebuilt_image(tmp_dir)
  prebuilt_image = File.join(IMAGES_DIR, "#{@image_name}.tar.xz")
  destination = File.join(tmp_dir, "#{@image_name}.tar.xz")
  FileUtils.cp(prebuilt_image, destination)
end

#create_dockerfile(tmp_dir) ⇒ Object 



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# File 'lib/sle2docker/rootfs_image.rb', line 47

def create_dockerfile(tmp_dir)
  prebuilt_image = @image_name + '.tar.xz'
  template = ERB.new(File.read(DOCKERFILE_TEMPLATE), nil, '<>')
                .result(binding)

  File.open(File.join(tmp_dir, 'Dockerfile'), 'w') do |file|
    file.write(template)
  end
end

#prepare_docker_build_root ⇒ Object 



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# File 'lib/sle2docker/rootfs_image.rb', line 39

def prepare_docker_build_root
  tmp_dir = Dir.mktmpdir("sle2docker-#{@image_name}-dockerfile")

  create_dockerfile(tmp_dir)
  copy_prebuilt_image(tmp_dir)
  tmp_dir
end