def get_bdm_image_metadata(context,
image_api,
volume_api,
block_device_mapping,
legacy_bdm=True):
"""Attempt to retrive image metadata from a given block_device_mapping.
If we are booting from a volume, we need to get the volume details from
Cinder and make sure we pass the metadata back accordingly.
:param context: request context
:param image_api: Image API
:param volume_api: Volume API
:param block_device_mapping:
:param legacy_bdm:
"""
if not block_device_mapping:
return {}
for bdm in block_device_mapping:
if (legacy_bdm
and get_device_letter(bdm.get('device_name', '')) != 'a'):
continue
elif not legacy_bdm and bdm.get('boot_index') != 0:
continue
volume_id = bdm.get('volume_id')
snapshot_id = bdm.get('snapshot_id')
if snapshot_id:
# NOTE(alaski): A volume snapshot inherits metadata from the
# originating volume, but the API does not expose metadata
# on the snapshot itself. So we query the volume for it below.
snapshot = volume_api.get_snapshot(context, snapshot_id)
volume_id = snapshot['volume_id']
if bdm.get('image_id'):
try:
image_id = bdm['image_id']
image_meta = image_api.get(context, image_id)
return image_meta
except Exception:
raise exception.InvalidBDMImage(id=image_id)
elif volume_id:
try:
volume = volume_api.get(context, volume_id)
except exception.CinderConnectionFailed:
raise
except Exception:
raise exception.InvalidBDMVolume(id=volume_id)
if not volume.get('bootable', True):
raise exception.InvalidBDMVolumeNotBootable(id=volume_id)
return get_image_metadata_from_volume(volume)
return {}
def root_metadata(self, context, image_api, volume_api):
root_bdm = self.root_bdm()
if not root_bdm:
return {}
if root_bdm.is_volume:
try:
volume = volume_api.get(context, root_bdm.volume_id)
return volume.get('volume_image_metadata', {})
except Exception:
raise exception.InvalidBDMVolume(id=root_bdm.id)
elif root_bdm.is_image:
try:
image_meta = image_api.show(context, root_bdm.image_id)
return image_meta.get('properties', {})
except Exception:
raise exception.InvalidBDMImage(id=root_bdm.id)
else:
return {}
