137 lines
4.6 KiB
Python
137 lines
4.6 KiB
Python
# Copyright 2015 Red Hat, 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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from oslo_log import log as logging
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from oslo_utils import importutils
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from nova import exception
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libosinfo = None
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LOG = logging.getLogger(__name__)
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# TODO(vladikr) The current implementation will serve only as a temporary
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# solution, due to it's dependency on the libosinfo gobject library.
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# In the future it will be replaced by a pure python library or by a direct
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# parsing of the libosinfo XML files. However, it will be possible only when
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# libosinfo project will declare the XML structure to be a stable ABI.
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class _OsInfoDatabase(object):
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_instance = None
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def __init__(self):
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global libosinfo
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try:
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if libosinfo is None:
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libosinfo = importutils.import_module(
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'gi.repository.Libosinfo')
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except ImportError as exp:
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LOG.info("Cannot load Libosinfo: (%s)", exp)
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else:
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self.loader = libosinfo.Loader()
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self.loader.process_default_path()
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self.db = self.loader.get_db()
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self.oslist = self.db.get_os_list()
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@classmethod
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def get_instance(cls):
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"""Get libosinfo connection
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"""
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if cls._instance is None:
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cls._instance = _OsInfoDatabase()
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return cls._instance
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def get_os(self, os_name):
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"""Retrieve OS object based on id, unique URI identifier of the OS
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:param os_name: id - the unique operating systemidentifier
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e.g. http://fedoraproject.org/fedora/21,
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http://microsoft.com/win/xp,
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or a
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short-id - the short name of the OS
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e.g. fedora21, winxp
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:returns: The operation system object Libosinfo.Os
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:raise exception.OsInfoNotFound: If os hasn't been found
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"""
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if libosinfo is None:
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return
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if not os_name:
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raise exception.OsInfoNotFound(os_name='Empty')
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fltr = libosinfo.Filter.new()
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flt_field = 'id' if os_name.startswith('http') else 'short-id'
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fltr.add_constraint(flt_field, os_name)
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filtered = self.oslist.new_filtered(fltr)
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list_len = filtered.get_length()
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if not list_len:
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raise exception.OsInfoNotFound(os_name=os_name)
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return filtered.get_nth(0)
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class OsInfo(object):
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"""OS Information Structure
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"""
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def __init__(self, os_name):
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self._os_obj = self._get_os_obj(os_name)
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def _get_os_obj(self, os_name):
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if os_name is not None:
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try:
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return _OsInfoDatabase.get_instance().get_os(os_name)
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except exception.NovaException as e:
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LOG.warning("Cannot find OS information - Reason: (%s)", e)
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@property
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def network_model(self):
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if self._os_obj is not None:
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fltr = libosinfo.Filter()
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fltr.add_constraint("class", "net")
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devs = self._os_obj.get_all_devices(fltr)
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if devs.get_length():
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return devs.get_nth(0).get_name()
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@property
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def disk_model(self):
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if self._os_obj is not None:
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fltr = libosinfo.Filter()
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fltr.add_constraint("class", "block")
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devs = self._os_obj.get_all_devices(fltr)
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if devs.get_length():
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return devs.get_nth(0).get_name()
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class HardwareProperties(object):
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def __init__(self, image_meta):
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""":param image_meta: ImageMeta object
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"""
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self.img_props = image_meta.properties
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os_key = self.img_props.get('os_distro')
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self.os_info_obj = OsInfo(os_key)
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@property
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def network_model(self):
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model = self.img_props.get('hw_vif_model',
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self.os_info_obj.network_model)
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return 'virtio' if model == 'virtio-net' else model
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@property
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def disk_model(self):
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model = self.img_props.get('hw_disk_bus',
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self.os_info_obj.disk_model)
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return 'virtio' if model == 'virtio-block' else model
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