[Bug 269686] textproc/py-sphinx-autodoc-typehints: Installation in unusable state

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=269686

--- Comment #1 from Andreas Bilke <andreas@bilke.org> ---
I further debugged the problem:

The default build command (for pep517 based builds) is

python3 -m build -n -w

which builds in *non isolation*. Doing this, I get a version.py (for this port)
looking like

# coding: utf-8
# file generated by setuptools_scm
# don't change, don't track in version control
version = '1.22'
version_tuple = (1, 22)

which leads to the error above.

If I build this python project in an isolated environment (I assume that
fetches all python deps explicitly in venv) with

python3 -m build -w

I get a file like

# file generated by setuptools_scm
# don't change, don't track in version control
__version__ = version = '1.22'
__version_tuple__ = version_tuple = (1, 22)

which is what sphinx-autodoc-typehints expects.

So building in isolation screws up the port system, doing it without isolation
results in a broken version.py.

I don't know what are the exact differences in deps between isolation/no
isolation. I assume some version differences in a dep (like setuptools_scm?).

I currently see no way of fixing that problem. I tried to post-patch the
generated version.py but the pep517 build commands generates version.py and
bundle it in a wheel in one step.

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