ament_pep257 fails in CI for ROS IDL generated python files

[agalbachicar]

Environment

Check this action for example.

Description

Checks using pep257 fail with the generated ROS IDL messages.

Steps to reproduce

This is a CI only problem, cannot reproduce it locally.

Output

test 28
        Start 28: pep257_rosidl_generated_py
  
  28: Test command: /usr/bin/python3 "-u" "/opt/ros/foxy/share/ament_cmake_test/cmake/run_test.py" "/__w/ros2_maliput/ros2_maliput/ros_ws/build/maliput_ros_interfaces/test_results/maliput_ros_interfaces/pep257_rosidl_generated_py.xunit.xml" "--package-name" "maliput_ros_interfaces" "--output-file" "/__w/ros2_maliput/ros2_maliput/ros_ws/build/maliput_ros_interfaces/ament_pep257/pep257_rosidl_generated_py.txt" "--command" "/opt/ros/foxy/bin/ament_pep257" "--xunit-file" "/__w/ros2_maliput/ros2_maliput/ros_ws/build/maliput_ros_interfaces/test_results/maliput_ros_interfaces/pep257_rosidl_generated_py.xunit.xml" "/__w/ros2_maliput/ros2_maliput/ros_ws/build/maliput_ros_interfaces/rosidl_generator_py/maliput_ros_interfaces"
  28: Test timeout computed to be: 60
  28: -- run_test.py: invoking following command in '/__w/ros2_maliput/ros2_maliput/ros_ws/src/pa65zil6ct/ros2_maliput/maliput_ros_interfaces':
  28:  - /opt/ros/foxy/bin/ament_pep257 --xunit-file /__w/ros2_maliput/ros2_maliput/ros_ws/build/maliput_ros_interfaces/test_results/maliput_ros_interfaces/pep257_rosidl_generated_py.xunit.xml /__w/ros2_maliput/ros2_maliput/ros_ws/build/maliput_ros_interfaces/rosidl_generator_py/maliput_ros_interfaces
  28: Traceback (most recent call last):
  28:   File "/opt/ros/foxy/bin/ament_pep257", line 11, in <module>
  28:     load_entry_point('ament-pep257==0.9.7', 'console_scripts', 'ament_pep257')()
  28:   File "/opt/ros/foxy/lib/python3.8/site-packages/ament_pep257/main.py", line 77, in main
  28:     report = generate_pep257_report(args.paths, excludes, args.ignore)
  28:   File "/opt/ros/foxy/lib/python3.8/site-packages/ament_pep257/main.py", line 133, in generate_pep257_report
  28:     for filename, checked_codes, ignore_decorators in files_to_check:
  28: ValueError: too many values to unpack (expected 3)
  28: -- run_test.py: return code 1
  28: -- run_test.py: generate result file '/__w/ros2_maliput/ros2_maliput/ros_ws/build/maliput_ros_interfaces/test_results/maliput_ros_interfaces/pep257_rosidl_generated_py.xunit.xml' with failed test
  28: -- run_test.py: verify result file '/__w/ros2_maliput/ros2_maliput/ros_ws/build/maliput_ros_interfaces/test_results/maliput_ros_interfaces/pep257_rosidl_generated_py.xunit.xml'
  28/32 Test #28: pep257_rosidl_generated_py ........................***Failed    0.41 sec