ament_uncrustify crash on uncrustify nonzero exit code

[rotu]

Ament uncrustify crashes on certain failure conditions with messy output and the eventual error message TypeError: 'int' object is not iterable

This is due to expecting invoke_uncrustify to return a list of files, though sometimes it returns an integer return code.

Further, the stack trace is omitted and the error message is duplicated in main.py (so you can't tell which subprocess call failed) and if there is any output from the failed subprocess, it is unclear what that output is.

https://github.com/ament/ament_lint/blob/b8b66ca0bb91fea492b202efa2d761de07569763/ament_uncrustify/ament_uncrustify/main.py#L128-L130

The invocation of 'uncrustify' failed with error code 1: Command '['/usr/bin/uncrustify', '-c', '/opt/ros/master/install/lib/python3.8/site-packages/ament_uncrustify/configuration/ament_code_style.cfg', '-l', 'C', '--prefix', '/tmp/uncrustify_559rpet5', '--suffix', '.uncrustify', '/home/dan/Documents/ros_ouster_ws/build/ouster_msgs/CMakeFiles/3.16.3/CompilerIdC/CMakeCCompilerId.c', '/home/dan/Documents/ros_ouster_ws/build/ouster_msgs/rosidl_generator_c/ouster_msgs/msg/metadata.h', '/home/dan/Documents/ros_ouster_ws/build/ouster_msgs/rosidl_generator_c/ouster_msgs/msg/metadata__functions.c', '/home/dan/Documents/ros_ouster_ws/build/ouster_msgs/rosidl_generator_c/ouster_msgs/msg/metadata__functions.h', '/home/dan/Documents/ros_ouster_ws/build/ouster_msgs/rosidl_generator_c/ouster_msgs/msg/metadata__struct.h', '/home/dan/Documents/ros_ouster_ws/build/ouster_msgs/rosidl_generator_c/ouster_msgs/msg/metadata__type_support.h', 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'/home/dan/Documents/ros_ouster_ws/install/lib/python3.8/site-packages/ouster_msgs/srv/_get_metadata_s.c', '/home/dan/Documents/ros_ouster_ws/install/lib/python3.8/site-packages/pcl_msgs/msg/_model_coefficients_s.c', '/home/dan/Documents/ros_ouster_ws/install/lib/python3.8/site-packages/pcl_msgs/msg/_point_indices_s.c', '/home/dan/Documents/ros_ouster_ws/install/lib/python3.8/site-packages/pcl_msgs/msg/_polygon_mesh_s.c', '/home/dan/Documents/ros_ouster_ws/install/lib/python3.8/site-packages/pcl_msgs/msg/_vertices_s.c', '/home/dan/Documents/ros_ouster_ws/install/lib/python3.8/site-packages/pcl_msgs/srv/_update_filename_s.c', '/home/dan/Documents/ros_ouster_ws/src/perception_pcl/pcl_conversions/include/pcl_conversions/pcl_conversions.h', '/home/dan/Documents/ros_ouster_ws/src/perception_pcl/pcl_ros/include/pcl_ros/pcl_nodelet.h', '/home/dan/Documents/ros_ouster_ws/src/perception_pcl/pcl_ros/include/pcl_ros/point_cloud.h', '/home/dan/Documents/ros_ouster_ws/src/perception_pcl/pcl_ros/include/pcl_ros/publisher.h', '/home/dan/Documents/ros_ouster_ws/src/perception_pcl/pcl_ros/include/pcl_ros/transforms.h', '/home/dan/Documents/ros_ouster_ws/src/perception_pcl/pcl_ros/include/pcl_ros/features/boundary.h', '/home/dan/Documents/ros_ouster_ws/src/perception_pcl/pcl_ros/include/pcl_ros/features/feature.h', '/home/dan/Documents/ros_ouster_ws/src/perception_pcl/pcl_ros/include/pcl_ros/features/fpfh.h', '/home/dan/Documents/ros_ouster_ws/src/perception_pcl/pcl_ros/include/pcl_ros/features/fpfh_omp.h', '/home/dan/Documents/ros_ouster_ws/src/perception_pcl/pcl_ros/include/pcl_ros/features/moment_invariants.h', '/home/dan/Documents/ros_ouster_ws/src/perception_pcl/pcl_ros/include/pcl_ros/features/normal_3d.h', '/home/dan/Documents/ros_ouster_ws/src/perception_pcl/pcl_ros/include/pcl_ros/features/normal_3d_omp.h', '/home/dan/Documents/ros_ouster_ws/src/perception_pcl/pcl_ros/include/pcl_ros/features/normal_3d_tbb.h', '/home/dan/Documents/ros_ouster_ws/src/perception_pcl/pcl_ros/include/pcl_ros/features/pfh.h', '/home/dan/Documents/ros_ouster_ws/src/perception_pcl/pcl_ros/include/pcl_ros/features/principal_curvatures.h', '/home/dan/Documents/ros_ouster_ws/src/perception_pcl/pcl_ros/include/pcl_ros/features/shot.h', '/home/dan/Documents/ros_ouster_ws/src/perception_pcl/pcl_ros/include/pcl_ros/features/shot_omp.h', '/home/dan/Documents/ros_ouster_ws/src/perception_pcl/pcl_ros/include/pcl_ros/features/vfh.h', '/home/dan/Documents/ros_ouster_ws/src/perception_pcl/pcl_ros/include/pcl_ros/filters/crop_box.h', '/home/dan/Documents/ros_ouster_ws/src/perception_pcl/pcl_ros/include/pcl_ros/filters/extract_indices.h', '/home/dan/Documents/ros_ouster_ws/src/perception_pcl/pcl_ros/include/pcl_ros/filters/filter.h', '/home/dan/Documents/ros_ouster_ws/src/perception_pcl/pcl_ros/include/pcl_ros/filters/passthrough.h', '/home/dan/Documents/ros_ouster_ws/src/perception_pcl/pcl_ros/include/pcl_ros/filters/project_inliers.h', '/home/dan/Documents/ros_ouster_ws/src/perception_pcl/pcl_ros/include/pcl_ros/filters/radius_outlier_removal.h', '/home/dan/Documents/ros_ouster_ws/src/perception_pcl/pcl_ros/include/pcl_ros/filters/statistical_outlier_removal.h', '/home/dan/Documents/ros_ouster_ws/src/perception_pcl/pcl_ros/include/pcl_ros/filters/voxel_grid.h', '/home/dan/Documents/ros_ouster_ws/src/perception_pcl/pcl_ros/include/pcl_ros/io/bag_io.h', '/home/dan/Documents/ros_ouster_ws/src/perception_pcl/pcl_ros/include/pcl_ros/io/concatenate_data.h', '/home/dan/Documents/ros_ouster_ws/src/perception_pcl/pcl_ros/include/pcl_ros/io/concatenate_fields.h', '/home/dan/Documents/ros_ouster_ws/src/perception_pcl/pcl_ros/include/pcl_ros/io/pcd_io.h', '/home/dan/Documents/ros_ouster_ws/src/perception_pcl/pcl_ros/include/pcl_ros/segmentation/extract_clusters.h', '/home/dan/Documents/ros_ouster_ws/src/perception_pcl/pcl_ros/include/pcl_ros/segmentation/extract_polygonal_prism_data.h', '/home/dan/Documents/ros_ouster_ws/src/perception_pcl/pcl_ros/include/pcl_ros/segmentation/sac_segmentation.h', '/home/dan/Documents/ros_ouster_ws/src/perception_pcl/pcl_ros/include/pcl_ros/segmentation/segment_differences.h', '/home/dan/Documents/ros_ouster_ws/src/perception_pcl/pcl_ros/include/pcl_ros/surface/convex_hull.h', '/home/dan/Documents/ros_ouster_ws/src/perception_pcl/pcl_ros/include/pcl_ros/surface/moving_least_squares.h']' returned non-zero exit status 1.
Traceback (most recent call last):
  File "/opt/ros/master/install/bin/ament_uncrustify", line 11, in <module>
    load_entry_point('ament-uncrustify==0.8.1', 'console_scripts', 'ament_uncrustify')()
  File "/opt/ros/master/install/lib/python3.8/site-packages/ament_uncrustify/main.py", line 130, in main
    all_output_files += output_files
TypeError: 'int' object is not iterable

[dirk-thomas]

This is a regression of #214.