1423 - Better PyApp integration

[johannesloibl]

This is a first draft for #1423.

The usage can be seen in the added unit test.

If the implementation is ok, i would continue with documentation updates.

[johannesloibl]

Alright, implementation should be done. Doing docs now ;)

[johannesloibl]

Forgot to say, I'm done with my changes.
Maybe you find some time to review.
The changes should be fully backward compatible.

[johannesloibl]

Gentle reminder that this PR is done from my side and needs review.

[ofek]

this will be in the next release, thank you!

[johannesloibl]

Awesome, thanks. Looking forward to it :)

[mmorys]

Looking through the code and the discussion on #1423, I would like to propose change

Proposed Changes

• Remove python-version from Options.
• Ensure that and PYAPP_EXEC_* environment variables are ignored and document that behavior in the docs I noticed that you have already documented this note at the bottom of the binary.md file.

Reasoning

• I don't think we should have PyApp settings set in both the env-vars section and Options that could lead to ambiguity. There is a PyApp env var called PYAPP_PYTHON_VERSION which makes it possible to define this seemingly identical setting in two different ways, using python-version and PYAPP_PYTHON_VERSION.
• scripts will presumably override any PYAPP_EXEC_* settings and isn't a direct mapping between an option and environment variable and provides the ability to have multiple binaries, so I think that's ok to leave as an option. It should be documented that this plugin does not use the PYAPP_EXEC_* environment variables.

[mmorys]

I have tested the proposed changes and this does not fix the issue defined in #1436. The project is not actually installed within the PyApp binary, resulting in a No matching distribution error.

According to the PyApp Docs there are 3 ways to define the project path. Here, PYAPP_PROJECT_NAME and PYAPP_PROJECT_VERSION are defined, meaning you are using the Identifier configuration which means "the package will be installed from a package index like PyPI". This is not what we want, as the package is local and not necessarily on PyPi.

Rather than defining these two variables here, the builder should utilize the Embedding config method:

• Build an sdist or wheel in a temporary directory
• Set PYAPP_PROJECT_PATH to point to this file
  • Name and version are automatically derived from the sdist/wheel metadata.

See my comment on the related issue for how I got around this issue by building and pointing to an sdist.