':returns: percentage indicating how full the store is'

def get_store_usage_percent(self):

    quotas = self.astakos.get_quotas()
    project = self.config_dict['container']['project']
    pithos_quotas = quotas[project]['pithos.diskspace']
    usage = pithos_quotas['usage']
    limit = min(pithos_quotas['limit'], pithos_quotas['project_limit'])
    return ((100.0 * usage) / limit)
