Recent upstream changes to python-empy

Hey all,

I recently updated my arch packages and this update has left ros in a broken state. And this is due to the upstream dependency python-empy package.

Recently the package python-empy was updated from 3.3.4 to 4.0.1. And 4.0.1 introduced quite a few breaking changes. And ros-noetic-catkin depends on this python-empy package.

Error while updating the ros-noetic-* packages after pacman -Syu:

Traceback (most recent call last):
  File "/opt/ros/noetic/share/gencpp/cmake/../../../lib/gencpp/gen_cpp.py", line 49, in <module>
  File "/opt/ros/noetic/share/gencpp/cmake/../../../lib/gencpp/gen_cpp.py", line 49, in <module>
    genmsg.template_tools.generate_from_command_line_options(
  File "/opt/ros/noetic/lib/python3.11/site-packages/genmsg/template_tools.py", line 213, in generate_from_command_line_options
    genmsg.template_tools.generate_from_command_line_options(
  File "/opt/ros/noetic/lib/python3.11/site-packages/genmsg/template_tools.py", line 213, in generate_from_command_line_options
    generate_from_file(argv[1], options.package, options.outdir, options.emdir, options.includepath, msg_template_dict, srv_template_dict)
    generate_from_file(argv[1], options.package, options.outdir, options.emdir, options.includepath, msg_template_dict, srv_template_dict)
  File "/opt/ros/noetic/lib/python3.11/site-packages/genmsg/template_tools.py", line 156, in generate_from_file
  File "/opt/ros/noetic/lib/python3.11/site-packages/genmsg/template_tools.py", line 154, in generate_from_file
    _generate_srv_from_file(input_file, output_dir, template_dir, search_path, package_name, srv_template_dict, msg_template_dict)
    _generate_msg_from_file(input_file, output_dir, template_dir, search_path, package_name, msg_template_dict)
  File "/opt/ros/noetic/lib/python3.11/site-packages/genmsg/template_tools.py", line 109, in _generate_srv_from_file
  File "/opt/ros/noetic/lib/python3.11/site-packages/genmsg/template_tools.py", line 93, in _generate_msg_from_file
    _generate_from_spec(input_file,
  File "/opt/ros/noetic/lib/python3.11/site-packages/genmsg/template_tools.py", line 77, in _generate_from_spec
    _generate_from_spec(input_file,
  File "/opt/ros/noetic/lib/python3.11/site-packages/genmsg/template_tools.py", line 77, in _generate_from_spec
    interpreter = em.Interpreter(output=ofile, globals=g, options={em.RAW_OPT:True,em.BUFFERED_OPT:True})
    interpreter = em.Interpreter(output=ofile, globals=g, options={em.RAW_OPT:True,em.BUFFERED_OPT:True})
                                                                   ^^^^^^^^^^
                                                                   ^^^^^^^^^^
AttributeError: module 'em' has no attribute 'RAW_OPT'
AttributeError: module 'em' has no attribute 'RAW_OPT'

It seems to me this can be resolved by explicitly specifying the last version which was working (3.3.4) in the PKGBUILD file. But this would pull in two packages i.e., 4.0.1 and 3.3.4.

Are we good to specify the package version 3.3.4 in the PKGBUILD file?

ros-noetic-arch / ros-noetic-catkin

Recent upstream changes to python-empy #6