fabric.py 文件源码

def __call__(self):
        query = self.query
        environment = self.environment
        if environment is _default_environment:
            environment = env.get('chef_environment', DEFAULT_ENVIRONMENT)
        if environment:
            query += ' AND chef_environment:%s' % environment
        for row in Search('node', query, api=self.api):
            if row:
                if callable(self.hostname_attr):
                    val = self.hostname_attr(row.object)
                    if val:
                        yield val
                else:
                    for attr in self.hostname_attr:
                        try:
                            val =  row.object.attributes.get_dotted(attr)
                            if val: # Don't ever give out '' or None, since it will error anyway
                                yield val
                                break
                        except KeyError:
                            pass # Move on to the next
                    else:
                        raise ChefError('Cannot find a usable hostname attribute for node %s', row.object)