Class: VagrantPlugins::ProviderLibvirt::Action::DestroyNetworks

Inherits:
Object
  • Object
show all
Defined in:
lib/vagrant-libvirt/action/destroy_networks.rb

Overview

Destroy all networks created for this specific domain. Skip removing if network has still active connections.

Instance Method Summary collapse

Constructor Details

#initialize(app, _env) ⇒ DestroyNetworks

Returns a new instance of DestroyNetworks.


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# File 'lib/vagrant-libvirt/action/destroy_networks.rb', line 10

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

Instance Method Details

#call(env) ⇒ Object


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# File 'lib/vagrant-libvirt/action/destroy_networks.rb', line 15

def call(env)
  if env[:machine].provider_config.qemu_use_session
    @app.call(env)
    return
  end

  # If there were some networks created for this machine, in machines
  # data directory, created_networks file holds UUIDs of each network.
  created_networks_file = env[:machine].data_dir + 'created_networks'

  @logger.info 'Checking if any networks were created'
  # If created_networks file doesn't exist, there are no networks we
  # need to remove.
  unless File.exist?(created_networks_file)
    env[:machine].id = nil
    return @app.call(env)
  end

  @logger.info 'File with created networks exists'

  # Iterate over each created network UUID and try to remove it.
  created_networks = []
  file = File.open(created_networks_file, 'r')
  file.readlines.each do |network_uuid|
    @logger.info "Checking for #{network_uuid}"
    # lookup_network_by_uuid throws same exception
    # if there is an error or if the network just doesn't exist
    begin
      libvirt_network = env[:machine].provider.driver.connection.client.lookup_network_by_uuid(
        network_uuid
      )
    rescue Libvirt::RetrieveError => e
      # this network is already destroyed, so move on
      if e.message =~ /Network not found/
        @logger.info 'It is already undefined'
        next
      # some other error occured, so raise it again
      else
        raise e
      end
    end

    # Skip removing if network has still active connections.
    xml = Nokogiri::XML(libvirt_network.xml_desc)
    connections = xml.xpath('/network/@connections').first
    unless connections.nil?
      @logger.info 'Still has connections so will not undefine'
      created_networks << network_uuid
      next
    end

    # Shutdown network first.
    # Undefine network.
    begin
      libvirt_network.destroy
      libvirt_network.undefine
      @logger.info 'Undefined it'
    rescue => e
      raise Errors::DestroyNetworkError,
            network_name: libvirt_network.name,
            error_message: e.message
    end
  end
  file.close

  # Update status of created networks after removing some/all of them.
  # Not sure why we are doing this, something else seems to always delete the file
  if !created_networks.empty?
    File.open(created_networks_file, 'w') do |file|
      @logger.info 'Writing new created_networks file'
      created_networks.each do |network_uuid|
        file.puts network_uuid
      end
    end
  else
    @logger.info 'Deleting created_networks file'
    File.delete(created_networks_file)
  end

  env[:machine].id = nil
  @app.call(env)
end