This breaks when the entry point is actually case-sensitive.

1. git clone https://github.com/pydoit/doit-plugin-sample
2. Delete setup.py, use the following setup.cfg:

[metadata] name = doit-plugin-sample description = a simple doit command plugin [options] py_modules = doit_sample_cmd install_requires = doit [options.entry_points] doit.COMMAND = plug_sample = doit_sample_cmd:SampleCmd 

3. Use this pyproject.toml:

[build-system] requires = ["setuptools>=30.3.0", "wheel"] 

4. pip install . inside a venv.

Inspecting venv/*/site-packages/doit_plugin_sample-0.0.0.dist-info/entry_points.txt:

[doit.command] plug_sample = doit_sample_cmd:SampleCmd 

This will not work, as the entry point is doit.COMMAND.