This test script reproduces a NameError in bitbake generateTargetsTree command

test_generateTargetsTree.py

#!/usr/bin/env python3
import sys
import os

bindir = os.path.dirname(__file__)
topdir = os.path.dirname(bindir)

sys.path[0:0] = [os.path.join(topdir, 'lib')]

from bb.tinfoil import Tinfoil
from bb.cooker import CookerFeatures

import logging

logger = logging.getLogger('BitBake.Test')
logger.addHandler(logging.StreamHandler())
logger.setLevel(logging.INFO)

tf = Tinfoil()
tf.prepare(config_only=True, extra_features=[CookerFeatures.HOB_EXTRA_CACHES])
tf.set_event_mask(['bb.event.NoProvider', 'bb.event.DepTreeGenerated', 'bb.command.CommandCompleted', 'bb.event.TargetsTreeGenerated', 'bb.command.CommandFailed'])
try:
    tf.run_command('generateTargetsTree', None, ['core-image-minimal'])
    event = None
    while not isinstance(event, (bb.event.NoProvider, bb.event.DepTreeGenerated, bb.command.CommandCompleted, bb.event.TargetsTreeGenerated, bb.command.CommandFailed)):
        event = tf.wait_event(60)

    if isinstance(event, (bb.command.CommandFailed)):
        logger.info("message %s" % event.error)
    else:
        logger.info("event is %s" % event)
except Exception as e:
    import traceback
    logger.error("exception %s" % e.format_exc())

tf.shutdown()