Hi all,

Since this merge landed, the builds for several Python packages in my personal channel broke.  Any package using pyproject-build-system for a Python project using setuptools seems to be affected.  This python-manhole package[1] is an example.  It's  about as simple as they can get, with no inputs or custom build steps.  It's failing with:

------------------------------------------------------------
starting phase `build'
Using 'setuptools.build_meta' to build wheels, auto-detected '#f', override '#f'.
Prepending '[]' to sys.path, auto-detected '#f', override '#f'.
Traceback (most recent call last):
  File "<string>", line 6, in <module>
  File "/gnu/store/jjcka1g6sk2cvwx8nm4fdwpdq3vll0v0-python-3.10.7/lib/python3.10/importlib/__init__.py", line 126, in import_module
return _bootstrap._gcd_import(name[level:], package, level)
  File "<frozen importlib._bootstrap>", line 1050, in _gcd_import
  File "<frozen importlib._bootstrap>", line 1027, in _find_and_load
  File "<frozen importlib._bootstrap>", line 992, in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 241, in _call_with_frames_removed
  File "<frozen importlib._bootstrap>", line 1050, in _gcd_import
  File "<frozen importlib._bootstrap>", line 1027, in _find_and_load
  File "<frozen importlib._bootstrap>", line 1004, in _find_and_load_unlocked
ModuleNotFoundError: No module named 'setuptools'
error: in phase 'build': uncaught exception:
%exception #<&invoke-error program: "python" arguments: ("-c" "import sys, importlib, json\nbackend_path = json.loads (sys.argv[1]) or []\nbackend_path.extend (sys.path)\nsys.path = backend_path\nconfig_settings = json.loads (sys.argv[4])\nbuilder = importlib.import_module(sys.argv[2])\nbuilder.build_wheel(sys.argv[3], config_settings=config_settings)" "[]" "setuptools.build_meta" "dist" "{}") exit-status: 1 term-signal: #f stop-signal: #f> 
phase `build' failed after 0.0 seconds
command "python" "-c" "import sys, importlib, json\nbackend_path = json.loads (sys.argv[1]) or []\nbackend_path.extend (sys.path)\nsys.path = backend_path\nconfig_settings = json.loads (sys.argv[4])\nbuilder = importlib.import_module(sys.argv[2])\nbuilder.build_wheel(sys.argv[3], config_settings=config_settings)" "[]" "setuptools.build_meta" "dist" "{}" failed with status 1
build process 10 exited with status 256
------------------------------------------------------------

Since it's complaining about setuptools, I thought I might need to add that to the native-inputs.  Alas, that fails with a different error:

------------------------------------------------------------
starting phase `build'
Using 'setuptools.build_meta' to build wheels, auto-detected '#f', override '#f'.
Prepending '[]' to sys.path, auto-detected '#f', override '#f'.
usage: -c [global_opts] cmd1 [cmd1_opts] [cmd2 [cmd2_opts] ...]
   or: -c --help [cmd1 cmd2 ...]
   or: -c --help-commands
   or: -c cmd --help

error: invalid command 'bdist_wheel'
------------------------------------------------------------

Is there somewhere I can find out how to fix these packages for the updated pyproject-build-system?  Should they be getting switched to python-build-system?

Noting also that the PyPI module for `guix import' hardcodes the pyproject-build-system, so it will generate unbuildable definitions for any Python project which uses setuptools.

Thanks,

  -- Ian

[1]: https://codeberg.org/ieure/atomized-guix/src/branch/main/atomized/packages/python-xyz.scm#L22

On Fri, Dec 13, 2024, at 5:00 PM, jgart wrote:
> Hi Sharlatan,
> 
> Guix cheerleader here. Go for it! Merge ahoy!
> 🦜🦆
> LGTM
> 
>