Class: Sahara::Session::Libvirt

Inherits:
Object
  • Object
show all
Defined in:
lib/sahara/session/libvirt.rb

Instance Method Summary collapse

Constructor Details

#initialize(machine) ⇒ Libvirt

Returns a new instance of Libvirt.



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# File 'lib/sahara/session/libvirt.rb', line 7

def initialize(machine)
  @machine=machine
  @sandboxname="sahara-sandbox"
  @connection=connect_to_libvirt
  @domain=get_domain
end

Instance Method Details

#commit ⇒ Object 



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# File 'lib/sahara/session/libvirt.rb', line 113

def commit
  off
  on
end

#connect_to_libvirt ⇒ Object

based on VagrantPlugins::ProviderLibvirt::Action::ConnectLibvirt



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# File 'lib/sahara/session/libvirt.rb', line 15

def connect_to_libvirt
  # Get config options for libvirt provider.
  config = @machine.provider_config

  # Setup connection uri.
  uri = config.driver
  if uri == "kvm"
    uri = "qemu"
  end

  if config.connect_via_ssh
    uri << '+ssh://'
    if config.username
      uri << config.username + '@'
    end

    if config.host
      uri << config.host
    else
      uri << 'localhost'
    end
  else
    uri << '://'
    uri << config.host if config.host
  end

  uri << '/system?no_verify=1'
  # set ssh key for access to libvirt host
  home_dir = `echo ${HOME}`.chomp
  uri << "&keyfile=#{home_dir}/.ssh/id_rsa"

  conn_attr = {}
  conn_attr[:provider] = 'libvirt'
  conn_attr[:libvirt_uri] = uri
  conn_attr[:libvirt_username] = config.username if config.username
  conn_attr[:libvirt_password] = config.password if config.password

  begin
    Fog::Compute.new(conn_attr)
  rescue Fog::Errors::Error => e
    raise Sahara::Errors::LibvirtConnectionError,
      :error_message => e.message
  end
end

#get_domain ⇒ Object 



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# File 'lib/sahara/session/libvirt.rb', line 60

def get_domain
  if is_vm_created?
    return @connection.client.lookup_domain_by_uuid(@machine.id)
  else
    return nil
  end
end

#get_snapshot_if_exists ⇒ Object 



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# File 'lib/sahara/session/libvirt.rb', line 68

def get_snapshot_if_exists
  # if we can get snapshot description without exception it exists
  begin
    snapshot = @domain.lookup_snapshot_by_name(@sandboxname)
    snapshot_desc = snapshot.xml_desc
  rescue
    raise Sahara::Errors::SnapshotMissing
  end
  return snapshot
end

#is_snapshot_mode_on? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/sahara/session/libvirt.rb', line 79

def is_snapshot_mode_on?
  begin
    snapshot = get_snapshot_if_exists
  rescue Sahara::Errors::SnapshotMissing
    return false
  end
  return true
end

#is_vm_created? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/sahara/session/libvirt.rb', line 130

def is_vm_created?
  return !@machine.id.nil?
end

#off ⇒ Object 



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# File 'lib/sahara/session/libvirt.rb', line 88

def off
  snapshot = get_snapshot_if_exists
  begin
    snapshot.delete
  rescue Fog::Errors::Error => e
    raise Sahara::Errors::SnapshotDeletionError,
      :error_message => e.message
  end
end

#on ⇒ Object 



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# File 'lib/sahara/session/libvirt.rb', line 98

def on
  snapshot_desc = <<-EOF
  <domainsnapshot>
    <name>sahara-sandbox</name>
    <description>Snapshot for vagrant sandbox</description>
  </domainsnapshot>
  EOF
  begin
    @domain.snapshot_create_xml(snapshot_desc)
  rescue Fog::Errors::Error => e
    raise Sahara::Errors::SnapshotCreationError,
      :error_message => e.message
  end
end

#rollback ⇒ Object 



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# File 'lib/sahara/session/libvirt.rb', line 118

def rollback
  snapshot = get_snapshot_if_exists
  begin
    # 4 is VIR_DOMAIN_SNAPSHOT_REVERT_FORCE
    # needed due to https://bugzilla.redhat.com/show_bug.cgi?id=1006886
    @domain.revert_to_snapshot(snapshot, 4)
  rescue Fog::Errors::Error => e
    raise Sahara::Errors::SnapshotReversionError,
      :error_message => e.message
  end
end