This commit splits the `buildPythonPackage` into multiple setup hooks.
Generally, Python packages are built from source to wheels using `setuptools`.
The wheels are then installed with `pip`. Tests were often called with
`python setup.py test` but this is less common nowadays. Most projects
now use a different entry point for running tests, typically `pytest`
or `nosetests`.
Since the wheel format was introduced more tools were built to generate these,
e.g. `flit`. Since PEP 517 is provisionally accepted, defining a build-system
independent format (`pyproject.toml`), `pip` can now use that format to
execute the correct build-system.
In the past I've added support for PEP 517 (`pyproject`) to the Python
builder, resulting in a now rather large builder. Furthermore, it was not possible
to reuse components elsewhere. Therefore, the builder is now split into multiple
setup hooks.
The `setuptoolsCheckHook` is included now by default but in time it should
be removed from `buildPythonPackage` to make it easier to use another hook
(curently one has to pass in `dontUseSetuptoolsCheck`).
By default all warnings were printed. This occasionally resulted in
a lot of warnings leading to builds being killed.
This commit reduces the amount of warnings printed.
It was reported that the 2nd solution wasn't working as expected because
it was ran in the wrong phase.
This commit creates a new phase, in between the installCheckPhase and distPhase.
In 610485faa7 a setupHook was added to `pytest`
to prevent the creation of `.pytest-cache` folder. Some pytest plugins relied
on the cache and were thus failing.
This commit permits the cache during build time but removes it in a `postFixupHook`.
When `py.test` was run with a folder as argument, it would not only
search for tests in that folder, but also create a .pytest-cache folder.
Not only is this state we don't want, but it was also causing
collisions.
