[BUG] pyproject.toml tools.setuptools.packages not recognized

[hoba87]

setuptools version

67.0.0

Python version

3.9

OS

Win11

Additional environment information

I'm using a venv.

Description

With my flat directory layout I'm getting the error: " Multiple top-level packages discovered in a flat-layout: ['gui', 'misc', 'package']"
Settings in pyproject.toml as given below doesn't work. I have also tried with settings include/exclude for find.
The error only vanishes, if I use a additional setup.py with

import setuptools

if __name__ == "__main__":
    setuptools.setup(packages=['package'])

Expected behavior

It should work without the additional setup.py

How to Reproduce

directory layout:

- package
  - gui
  - misc
  - package
    - __init__.py
  - pyproject.toml

With the setting in pyproject.toml:

[tools.setuptools]
packages = ["package"]

Output

  Installing build dependencies ... done
  Getting requirements to build wheel ... error
  error: subprocess-exited-with-error

  × Getting requirements to build wheel did not run successfully.
  │ exit code: 1
  ╰─> [14 lines of output]
      error: Multiple top-level packages discovered in a flat-layout: ['gui', 'misc', 'package'].

      To avoid accidental inclusion of unwanted files or directories,
      setuptools will not proceed with this build.

      If you are trying to create a single distribution with multiple packages
      on purpose, you should not rely on automatic discovery.
      Instead, consider the following options:

      1. set up custom discovery (`find` directive with `include` or `exclude`)
      2. use a `src-layout`
      3. explicitly set `py_modules` or `packages` with a list of names

      To find more information, look for "package discovery" on setuptools docs.
      [end of output]

  note: This error originates from a subprocess, and is likely not a problem with pip.
error: subprocess-exited-with-error

× Getting requirements to build wheel did not run successfully.
│ exit code: 1
╰─> See above for output.

note: This error originates from a subprocess, and is likely not a problem with pip.

[abravalheri]

Hi @hoba87, if I am not wrong, the correct would be [tool.setuptools] instead of tools.

[abravalheri]

Because pyproject.toml can be filled in with a lot of stuff from the most diverse tools (and sometimes those not respect PEP 518), setuptools will only validate the project and tool.setuptools section.

If you want to check you file, you can use something like validate-pyproject (and/or pre-commit):

cat <<EOF | pipx run 'validate-pyproject[all]'
[tools.setuptools]
packages = ["package"]
EOF
# => Invalid file: <stdin>
# => [ERROR] `data` must not contain {'tools'} properties

[hoba87]

Ok, thanks.