[build-system] contents not honored

[bsvedin]

• I am on the latest Poetry version.

• I have searched the issues of this repo and believe that this is not a duplicate.

• If an exception occurs when executing a command, I executed it again in debug mode (-vvv option).

• OS version and name: Windows 10

• Poetry version: 1.1.12 - also tried 1.2.0a2

• Link of a Gist with the contents of your pyproject.toml file: https://gist.github.com/bsvedin/0b705d54dec6d1834cd2f2864b86cd9d

Issue

The contents of the [build-system] do not appear to be honored.
Specifically Nuitka (version 0.6.18) recently added the build meta for creating compiled whl files.
Updating the build-system section should be all that is required

[build-system]
requires = ["setuptools>=42", "wheel", "nuitka"]
build-backend = "nuitka.distutils.Build"

running "poetry build -f wheel" still builds readable source code wheel file

poetry build -f wheel
Building hello-world-example (0.1.0)
  - Building wheel
  - Built hello_world_example-0.1.0-py3-none-any.whl

I have tried putting in nonsense in as well for the requires and build-backend values and it still builds the whl file without throwing an error.
e.g.
requires = ["l;kasdhfiosadhf", "wheel", "nuitka"]
build-backend = "l;kdsajosadhfl;ksdzxn"

It does throw an error if there are multiple entries for requires or build-backend saying TOMLError key already exists
e.g.
requires = ["setuptools>=42", "wheel", "nuitka"]
build-backend = "nuitka.distutils.Build"
build-backend = "poetry.core.masonry.api"

[finswimmer]

Hello @bsvedin,

poetry build is not a general build tool for python packages. It is only for building a package from a poetry project. And so it doesn't care about the given build-backend and uses its own automatically.

fin swimmer

[kayhayen]

@finswimmer is there any way that Nuitka could hook the poetry wheel build just like it does with other systems now? With setuptools and build this works, and if Nuitka were allowed to wrap/subclass things and get used, that would be very useful, at least for my user base.

[tony-gm]

This is very import for poetry support customize build-backend;
I'm going to use poetry to manage all python project in my company.
Some project we need to customize some setup hooks.
But poetry can not use build-backend stuck on me.

[finswimmer]

Custom build.py scripts like e.g. in #3576 is an undocumented feature because there is no decision about if its current implementation should/will be the final one. Once this happened the additional dependencies for a build will be honored. @abn started a proof-of-concept some time ago in #2794.

[github-actions]

This issue has been automatically locked since there has not been any recent activity after it was closed. Please open a new issue for related bugs.