85 lines
2.9 KiB
Python
85 lines
2.9 KiB
Python
# vim: tabstop=4 shiftwidth=4 softtabstop=4
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# Copyright 2010 United States Government as represented by the
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# Administrator of the National Aeronautics and Space Administration.
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# All Rights Reserved.
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# Copyright (c) 2010 Citrix Systems, Inc.
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#
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# Licensed under the Apache License, Version 2.0 (the "License"); you may
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# not use this file except in compliance with the License. You may obtain
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# a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations
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# under the License.
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"""Abstraction of the underlying virtualization API."""
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import sys
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from nova.common import deprecated
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from nova import exception
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from nova import flags
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from nova.openstack.common import importutils
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from nova.openstack.common import log as logging
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from nova import utils
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from nova.virt import driver
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LOG = logging.getLogger(__name__)
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FLAGS = flags.FLAGS
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known_drivers = {
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'baremetal': 'baremetal.BareMetalDriver',
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'fake': 'fake.FakeDriver',
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'libvirt': 'libvirt.LibvirtDriver',
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'vmwareapi': 'vmwareapi.VMWareESXDriver',
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'xenapi': 'xenapi.XenAPIDriver'
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}
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def get_connection(read_only=False):
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"""
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Returns an object representing the connection to a virtualization
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platform, or to an on-demand bare-metal provisioning platform.
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This could be :mod:`nova.virt.fake.FakeConnection` in test mode,
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a connection to KVM, QEMU, or UML via :mod:`libvirt_conn`, or a connection
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to XenServer or Xen Cloud Platform via :mod:`xenapi`. Other platforms are
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also supported.
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Any object returned here must conform to the interface documented by
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:mod:`FakeConnection`.
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**Related flags**
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:connection_type: A string literal that falls through an if/elif structure
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to determine what virtualization mechanism to use.
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Values may be
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* fake
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* libvirt
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* xenapi
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* vmwareapi
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* baremetal
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"""
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deprecated.warn(_('Specifying virt driver via connection_type is '
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'deprecated. Use compute_driver=classname instead.'))
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driver_name = known_drivers.get(FLAGS.connection_type)
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if driver_name is None:
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raise exception.VirtDriverNotFound(name=FLAGS.connection_type)
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conn = importutils.import_object_ns('nova.virt', driver_name,
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read_only=read_only)
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if conn is None:
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LOG.error(_('Failed to open connection to underlying virt platform'))
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sys.exit(1)
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return utils.check_isinstance(conn, driver.ComputeDriver)
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