def volume_context(self):
# provide basic validation that the volume manager is supported on the
# given openstack release (nova-volume is only supported for E and F)
# it is up to release templates to set the correct volume driver.
if not self.volume_service:
return {}
# ensure volume service is supported on specific openstack release.
if self.volume_service == 'cinder':
return 'cinder'
else:
e = ('Invalid volume service received via cloud-compute: %s' %
self.volume_service)
log(e, level=ERROR)
raise context.OSContextError(e)
def __call__(self):
ctxt = {}
if relation_ids('nova-volume-service'):
if utils.os_release('nova-common') not in ['essex', 'folsom']:
e = ('Attempting to relate a nova-volume service to an '
'Nova version (%s). Use cinder.')
log(e, level=ERROR)
raise context.OSContextError(e)
install_pkg = filter_installed_packages(['nova-api-os-volume'])
if install_pkg:
apt_install(install_pkg)
ctxt['volume_service'] = 'nova-volume'
elif relation_ids('cinder-volume-service'):
ctxt['volume_service'] = 'cinder'
# kick all compute nodes to know they should use cinder now.
[
relation_set(relation_id=rid, volume_service='cinder')
for rid in relation_ids('cloud-compute')
]
return ctxt