72 lines
2.5 KiB
Python
72 lines
2.5 KiB
Python
# Copyright (c) 2012-2013 Rackspace Hosting
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# All Rights Reserved.
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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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"""
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Image properties filter.
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Image metadata named 'hypervisor_version_requires' with a version specification
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may be specified to ensure the build goes to a cell which has hypervisors of
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the required version.
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If either the version requirement on the image or the hypervisor capability
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of the cell is not present, this filter returns without filtering out the
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cells.
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"""
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from distutils import versionpredicate
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from oslo_log import log as logging
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from nova.cells import filters
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LOG = logging.getLogger(__name__)
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class ImagePropertiesFilter(filters.BaseCellFilter):
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"""Image properties filter. Works by specifying the hypervisor required in
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the image metadata and the supported hypervisor version in cell
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capabilities.
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"""
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def filter_all(self, cells, filter_properties):
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"""Override filter_all() which operates on the full list
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of cells...
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"""
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request_spec = filter_properties.get('request_spec', {})
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image_properties = request_spec.get('image', {}).get('properties', {})
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hypervisor_version_requires = image_properties.get(
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'hypervisor_version_requires')
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if hypervisor_version_requires is None:
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return cells
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filtered_cells = []
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for cell in cells:
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version = cell.capabilities.get('prominent_hypervisor_version')
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if version:
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l = list(version)
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version = str(l[0])
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if not version or self._matches_version(version,
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hypervisor_version_requires):
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filtered_cells.append(cell)
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return filtered_cells
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def _matches_version(self, version, version_requires):
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predicate = versionpredicate.VersionPredicate(
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'prop (%s)' % version_requires)
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return predicate.satisfied_by(version)
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