[BUG] pkg_resources does not use dist-info from site-packages.zip

[ronaldoussoren]

setuptools version

setuptools==60.10.0

Python version

Python 3.10

OS

macOS

Additional environment information

The context for this is py2app: Py2app bundles an application on macOS into a ".app" bundle.

Description

As part of the bundling of an application into an .app by py2app the python modules/packages used by the script are copied into a ZIP file that's added on sys.path.

The class pkg_resources.WorkingSet does not use the dist-info information that's included in that zipfile because pkg_resources.WorkingSet.add_entry asks the Finder (in this case find_apps_in_zip) to not look for subitems (the only argument is set to True).

Because of that pkg_resources.iter_entrypoints does not find the entry points of distributions copied into the zipfile.

Related issue in py2app: ronaldoussoren/py2app#413

Expected behavior

I'd expect that the dist-info information that's included in the zipfile is used by pkg_resources.

How to Reproduce

On a macOS system:

• Create a venv and activate it
• Install setuptools and humanfriendly
• Clone the py2app repository (https://github.com/ronaldoussoren/py2app)
• Patch py2app/recipes/setuptools.py: Remove the "prescripts" from the dict returned by the check function
• instal py2appl: pip install ./py2app
• Change directory to examples/Tkinter/hello_tk
• Open hello.py and replace the last two lines (creating the app object and running the mainloop) by the code below

import humanfriendly
import pkg_resources
for ep in pkg_resources.iter_entry_points("console_scripts"):
    if ep.dist.project_name == "humanfriendly":
        break
else:
    raise RuntimeError("EP for humanfriendly not found")

• Build the app bundle using python setup.py py2app
• Start the application using dist/hello.app/Contents/MacOS/hello

What you'll see:

• The app fails to launch and prints in the Terminal that the EP for humanfriendly is not found.

Expected behaviour:

• Application starts and immediately stops

Output

See description in the previous step.

[ronaldoussoren]

One way to fix this is to patch find_eggs_in_zip:

• Don't check for only before the call to metadata.resource_listdir
• Do check for only before checking if the subitem is an egg, e.g. if not only and _is_egg_path(subitem):