d591e66821
The root disk image is moved to a separate disk slot while the rescue image will take it's place. If the instance requires it, a temporary config drive is created as well. Unrescuing the instance will move the root disk image back in place, removing temporary images. Implements: blueprint hyper-v-rescue Change-Id: I6059ae35a77d675f54b98b2b43b5762e1d24365b
164 lines
6.7 KiB
Python
164 lines
6.7 KiB
Python
# Copyright 2013 Cloudbase Solutions Srl
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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 caching and management.
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"""
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import os
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from nova import utils
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from nova.virt import images
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from oslo_config import cfg
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from oslo_log import log as logging
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from oslo_utils import excutils
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from oslo_utils import units
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from hyperv.i18n import _
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from hyperv.nova import utilsfactory
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from hyperv.nova import vmutils
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LOG = logging.getLogger(__name__)
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CONF = cfg.CONF
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CONF.import_opt('use_cow_images', 'nova.virt.driver')
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class ImageCache(object):
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def __init__(self):
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self._pathutils = utilsfactory.get_pathutils()
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self._vhdutils = utilsfactory.get_vhdutils()
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def _get_root_vhd_size_gb(self, instance):
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if instance.old_flavor:
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return instance.old_flavor.root_gb
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else:
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return instance.root_gb
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def _resize_and_cache_vhd(self, instance, vhd_path):
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vhd_info = self._vhdutils.get_vhd_info(vhd_path)
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vhd_size = vhd_info['MaxInternalSize']
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root_vhd_size_gb = self._get_root_vhd_size_gb(instance)
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root_vhd_size = root_vhd_size_gb * units.Gi
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root_vhd_internal_size = (
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self._vhdutils.get_internal_vhd_size_by_file_size(
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vhd_path, root_vhd_size))
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if root_vhd_internal_size < vhd_size:
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raise vmutils.HyperVException(
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_("Cannot resize the image to a size smaller than the VHD "
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"max. internal size: %(vhd_size)s. Requested disk size: "
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"%(root_vhd_size)s") %
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{'vhd_size': vhd_size, 'root_vhd_size': root_vhd_size}
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)
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if root_vhd_internal_size > vhd_size:
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path_parts = os.path.splitext(vhd_path)
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resized_vhd_path = '%s_%s%s' % (path_parts[0],
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root_vhd_size_gb,
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path_parts[1])
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@utils.synchronized(resized_vhd_path)
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def copy_and_resize_vhd():
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if not self._pathutils.exists(resized_vhd_path):
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try:
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LOG.debug("Copying VHD %(vhd_path)s to "
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"%(resized_vhd_path)s",
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{'vhd_path': vhd_path,
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'resized_vhd_path': resized_vhd_path})
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self._pathutils.copyfile(vhd_path, resized_vhd_path)
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LOG.debug("Resizing VHD %(resized_vhd_path)s to new "
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"size %(root_vhd_size)s",
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{'resized_vhd_path': resized_vhd_path,
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'root_vhd_size': root_vhd_size})
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self._vhdutils.resize_vhd(resized_vhd_path,
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root_vhd_internal_size,
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is_file_max_size=False)
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except Exception:
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with excutils.save_and_reraise_exception():
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if self._pathutils.exists(resized_vhd_path):
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self._pathutils.remove(resized_vhd_path)
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copy_and_resize_vhd()
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return resized_vhd_path
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def get_cached_image(self, context, instance, rescue_image_id=None):
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image_id = rescue_image_id or instance.image_ref
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base_vhd_dir = self._pathutils.get_base_vhd_dir()
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base_vhd_path = os.path.join(base_vhd_dir, image_id)
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@utils.synchronized(base_vhd_path)
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def fetch_image_if_not_existing():
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vhd_path = None
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for format_ext in ['vhd', 'vhdx']:
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test_path = base_vhd_path + '.' + format_ext
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if self._pathutils.exists(test_path):
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vhd_path = test_path
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break
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if not vhd_path:
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try:
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images.fetch(context, image_id, base_vhd_path,
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instance.user_id,
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instance.project_id)
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format_ext = self._vhdutils.get_vhd_format(base_vhd_path)
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vhd_path = base_vhd_path + '.' + format_ext.lower()
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self._pathutils.rename(base_vhd_path, vhd_path)
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except Exception:
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with excutils.save_and_reraise_exception():
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if self._pathutils.exists(base_vhd_path):
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self._pathutils.remove(base_vhd_path)
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return vhd_path
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vhd_path = fetch_image_if_not_existing()
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# Note: rescue images are not resized.
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is_vhd = vhd_path.split('.')[-1].lower() == 'vhd'
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if (CONF.use_cow_images and is_vhd and not rescue_image_id):
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# Resize the base VHD image as it's not possible to resize a
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# differencing VHD. This does not apply to VHDX images.
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resized_vhd_path = self._resize_and_cache_vhd(instance, vhd_path)
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if resized_vhd_path:
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return resized_vhd_path
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if rescue_image_id:
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self._verify_rescue_image(instance, rescue_image_id,
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vhd_path)
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return vhd_path
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def _verify_rescue_image(self, instance, rescue_image_id,
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rescue_image_path):
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rescue_image_info = self._vhdutils.get_vhd_info(rescue_image_path)
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rescue_image_size = rescue_image_info['MaxInternalSize']
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flavor_disk_size = instance.root_gb * units.Gi
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if rescue_image_size > flavor_disk_size:
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err_msg = _('Using a rescue image bigger than the instance '
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'flavor disk size is not allowed. '
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'Rescue image size: %(rescue_image_size)s. '
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'Flavor disk size:%(flavor_disk_size)s. '
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'Rescue image id %(rescue_image_id)s.')
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raise vmutils.HyperVException(err_msg %
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{'rescue_image_size': rescue_image_size,
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'flavor_disk_size': flavor_disk_size,
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'rescue_image_id': rescue_image_id})
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def get_image_details(self, context, instance):
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image_id = instance.image_ref
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return images.get_info(context, image_id)
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