def load_compute_driver(virtapi, compute_driver=None):
"""Load a compute driver module.
Load the compute driver module specified by the compute_driver
configuration option or, if supplied, the driver name supplied as an
argument.
Compute drivers constructors take a VirtAPI object as their first object
and this must be supplied.
:param virtapi: a VirtAPI instance
:param compute_driver: a compute driver name to override the config opt
:returns: a ComputeDriver instance
"""
if not compute_driver:
compute_driver = CONF.compute_driver
if not compute_driver:
LOG.error(_("Compute driver option required, but not specified"))
sys.exit(1)
LOG.info(_("Loading compute driver '%s'") % compute_driver)
try:
driver = importutils.import_object_ns('nova.virt',
compute_driver,
virtapi)
return utils.check_isinstance(driver, ComputeDriver)
except ImportError:
LOG.exception(_("Unable to load the virtualization driver"))
sys.exit(1)
def load_compute_driver(virtapi, compute_driver=None):
"""Load a compute driver module.
Load the compute driver module specified by the compute_driver
configuration option or, if supplied, the driver name supplied as an
argument.
Compute drivers constructors take a VirtAPI object as their first object
and this must be supplied.
:param virtapi: a VirtAPI instance
:param compute_driver: a compute driver name to override the config opt
:returns: a ComputeDriver instance
"""
if not compute_driver:
compute_driver = CONF.compute_driver
if not compute_driver:
LOG.error(_("Compute driver option required, but not specified"))
sys.exit(1)
LOG.info(_("Loading compute driver '%s'") % compute_driver)
try:
driver = importutils.import_object_ns('nova.virt', compute_driver,
virtapi)
return utils.check_isinstance(driver, ComputeDriver)
except ImportError:
LOG.exception(_("Unable to load the virtualization driver"))
sys.exit(1)
def load_snapshot_driver():
if not CONF.veta_snapshot_driver:
LOG.error(_("Snapshot driver option required, but not specified"))
sys.exit(1)
LOG.info(_("Loading snapshot driver '%s'") % CONF.veta_snapshot_driver)
try:
driver = importutils.import_object_ns('veta.driver',
CONF.veta_snapshot_driver)
return utils.check_isinstance(driver, SnapshotDriver)
except ImportError:
LOG.exception(_("Unable to load the snapshot driver"))
sys.exit(1)
def get_connection(read_only=False):
"""
Returns an object representing the connection to a virtualization
platform, or to an on-demand bare-metal provisioning platform.
This could be :mod:`nova.virt.fake.FakeConnection` in test mode,
a connection to KVM, QEMU, or UML via :mod:`libvirt_conn`, or a connection
to XenServer or Xen Cloud Platform via :mod:`xenapi`. Other platforms are
also supported.
Any object returned here must conform to the interface documented by
:mod:`FakeConnection`.
**Related flags**
:connection_type: A string literal that falls through an if/elif structure
to determine what virtualization mechanism to use.
Values may be
* fake
* libvirt
* xenapi
* vmwareapi
* baremetal
"""
deprecated.warn(
_('Specifying virt driver via connection_type is '
'deprecated. Use compute_driver=classname instead.'))
driver_name = known_drivers.get(FLAGS.connection_type)
if driver_name is None:
raise exception.VirtDriverNotFound(name=FLAGS.connection_type)
conn = importutils.import_object_ns('nova.virt',
driver_name,
read_only=read_only)
if conn is None:
LOG.error(_('Failed to open connection to underlying virt platform'))
sys.exit(1)
return utils.check_isinstance(conn, driver.ComputeDriver)
def get_connection(read_only=False):
"""
Returns an object representing the connection to a virtualization
platform, or to an on-demand bare-metal provisioning platform.
This could be :mod:`nova.virt.fake.FakeConnection` in test mode,
a connection to KVM, QEMU, or UML via :mod:`libvirt_conn`, or a connection
to XenServer or Xen Cloud Platform via :mod:`xenapi`. Other platforms are
also supported.
Any object returned here must conform to the interface documented by
:mod:`FakeConnection`.
**Related flags**
:connection_type: A string literal that falls through an if/elif structure
to determine what virtualization mechanism to use.
Values may be
* fake
* libvirt
* xenapi
* vmwareapi
* baremetal
"""
deprecated.warn(_('Specifying virt driver via connection_type is '
'deprecated. Use compute_driver=classname instead.'))
driver_name = known_drivers.get(FLAGS.connection_type)
if driver_name is None:
raise exception.VirtDriverNotFound(name=FLAGS.connection_type)
conn = importutils.import_object_ns('nova.virt', driver_name,
read_only=read_only)
if conn is None:
LOG.error(_('Failed to open connection to underlying virt platform'))
sys.exit(1)
return utils.check_isinstance(conn, driver.ComputeDriver)
