Class: VagrantPlugins::ProviderLibvirt::Action::CreateDomainVolume

Inherits:
Object
  • Object
show all
Includes:
Util::ErbTemplate, Util::StorageUtil
Defined in:
lib/vagrant-libvirt/action/create_domain_volume.rb

Overview

Create a snapshot of base box image. This new snapshot is just new cow image with backing storage pointing to base box image. Use this image as new domain volume.

Instance Method Summary collapse

Methods included from Util::StorageUtil

#storage_gid, #storage_pool_path, #storage_uid

Methods included from Util::ErbTemplate

#to_xml

Constructor Details

#initialize(app, _env) ⇒ CreateDomainVolume

Returns a new instance of CreateDomainVolume.


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# File 'lib/vagrant-libvirt/action/create_domain_volume.rb', line 13

def initialize(app, _env)
  @logger = Log4r::Logger.new('vagrant_libvirt::action::create_domain_volume')
  @app = app
end

Instance Method Details

#call(env) ⇒ Object


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# File 'lib/vagrant-libvirt/action/create_domain_volume.rb', line 18

def call(env)
  env[:ui].info(I18n.t('vagrant_libvirt.creating_domain_volume'))

  # Get config options.
  config = env[:machine].provider_config

  # This is name of newly created image for vm.
  @name = "#{env[:domain_name]}.img"

  # Verify the volume doesn't exist already.
  domain_volume = env[:machine].provider.driver.connection.volumes.all(
    name: @name
  ).first
  raise Errors::DomainVolumeExists if domain_volume && domain_volume.id

  # Get path to backing image - box volume.
  box_volume = env[:machine].provider.driver.connection.volumes.all(
    name: env[:box_volume_name]
  ).first
  @backing_file = box_volume.path

  # Virtual size of image. Take value worked out by HandleBoxImage
  @capacity = env[:box_virtual_size] # G

  # Create new volume from xml template. Fog currently doesn't support
  # volume snapshots directly.
  begin
    xml = Nokogiri::XML::Builder.new do |xml|
      xml.volume do
        xml.name(@name)
        xml.capacity(@capacity, unit: 'G')
        xml.target do
          xml.format(type: 'qcow2')
          xml.permissions do
            xml.owner storage_uid(env)
            xml.group storage_gid(env)
            xml.label 'virt_image_t'
          end
        end
        xml.backingStore do
          xml.path(@backing_file)
          xml.format(type: 'qcow2')
          xml.permissions do
            xml.owner storage_uid(env)
            xml.group storage_gid(env)
            xml.label 'virt_image_t'
          end
        end
      end
    end.to_xml(
      save_with: Nokogiri::XML::Node::SaveOptions::NO_DECLARATION |
                 Nokogiri::XML::Node::SaveOptions::NO_EMPTY_TAGS |
                 Nokogiri::XML::Node::SaveOptions::FORMAT
    )
    if config.snapshot_pool_name != config.storage_pool_name
        pool_name = config.snapshot_pool_name
    else
        pool_name = config.storage_pool_name
    end
    @logger.debug "Using pool #{pool_name} for base box snapshot"
    domain_volume = env[:machine].provider.driver.connection.volumes.create(
      xml: xml,
      pool_name: pool_name
    )
  rescue Fog::Errors::Error => e
    raise Errors::FogDomainVolumeCreateError,
          error_message: e.message
  end

  @app.call(env)
end