<s> from oslo_log import log as logging <EOL> import six <EOL> import nova . conf <EOL> from nova . scheduler import filters <EOL> from nova . scheduler . filters import utils <EOL> CONF = nova . conf . CONF <EOL> LOG = logging . getLogger ( __name__ ) <EOL> class AggregateImagePropertiesIsolation ( filters . BaseHostFilter ) : <EOL> """<STR_LIT>""" <EOL> run_filter_once_per_request = True <EOL> def host_passes ( self , host_state , spec_obj ) : <EOL> """<STR_LIT>""" <EOL> cfg_namespace = CONF . aggregate_image_properties_isolation_namespace <EOL> cfg_separator = CONF . aggregate_image_properties_isolation_separator <EOL> image_props = spec_obj . image . properties if spec_obj . image else { } <EOL> metadata = utils . aggregate_metadata_get_by_host ( host_state ) <EOL> for key , options in six . iteritems ( metadata ) : <EOL> if ( cfg_namespace and <EOL> not key . startswith ( cfg_namespace + cfg_separator ) ) : <EOL> continue <EOL> prop = image_props . get ( key ) <EOL> if prop and str ( prop ) not in options : <EOL> LOG . debug ( "<STR_LIT>" <EOL> "<STR_LIT>" <EOL> "<STR_LIT>" , <EOL> { '<STR_LIT>' : host_state , <EOL> '<STR_LIT>' : prop , <EOL> '<STR_LIT>' : options } ) <EOL> return False <EOL> return True </s>
