musllinux python3.11 broken wheel

[MartinoMensio]

Bug Description

Hi,
Thanks for the great resource.
I am testing musllinux builds, and I am currently unable to generate working wheels for python3.11. When I use python3.10 or lower, the compilation works as expected.

Traceback (most recent call last):
  File "<string>", line 1, in <module>
  File "/usr/local/lib/python3.11/site-packages/maturin_musl_fail/__init__.py", line 1, in <module>
    from .maturin_musl_fail import *
ModuleNotFoundError: No module named 'maturin_musl_fail.maturin_musl_fail'

I am not sure if this is a pyo3 isssue or a maturin issue, so please if this is not the correct place, just let me know.

Best,
Martino

Steps to Reproduce

1. I created this minimal example repository: https://github.com/MartinoMensio/maturin_musl_fail with the code generated with maturin init
2. I build the wheels with GitHub Actions, and they are generated successfully https://github.com/MartinoMensio/maturin_musl_fail/actions/runs/4608410699#artifacts
3. I download the wheels and I run the following code:

# tested broken on platforms linux/amd64 and linux/386 with alpine (musllinux) 
docker run --rm -it --platform=linux/amd64 -v `pwd`/wheels:/wheels python:3.11-alpine sh
# then inside install wheel (everything ok)
pip install wheels/maturin_musl_fail-0.1.0-cp311-cp311-musllinux_1_1_x86_64.whl
# then test import
python -c "import maturin_musl_fail; print('import ok')"

The last step generates:

Traceback (most recent call last):
  File "<string>", line 1, in <module>
  File "/usr/local/lib/python3.11/site-packages/maturin_musl_fail/__init__.py", line 1, in <module>
    from .maturin_musl_fail import *
ModuleNotFoundError: No module named 'maturin_musl_fail.maturin_musl_fail'

Backtrace

Traceback (most recent call last):
  File "<string>", line 1, in <module>
  File "/usr/local/lib/python3.11/site-packages/maturin_musl_fail/__init__.py", line 1, in <module>
    from .maturin_musl_fail import *
ModuleNotFoundError: No module named 'maturin_musl_fail.maturin_musl_fail'

Your operating system and version

MacOS Ventura 13.3

Your Python version (python --version)

python 3.11

Your Rust version (rustc --version)

rustc 1.68.2 (9eb3afe9e 2023-03-27)

Your PyO3 version

0.18.1

How did you install python? Did you use a virtualenv?

Buildtime:
github actions

Runtime generating error:
docker: python:3.11-alpine

Additional Info

No response

[MartinoMensio]

After analysing the generated .so files and reading the guide here: https://pyo3.rs/main/building_and_distribution

I discovered that:

1. the generated wheel has a .so file with name maturin_musl_fail.cpython-311-x86_64-linux-gnu.so
2. running python -c 'import sysconfig; print(sysconfig.get_config_var("EXT_SUFFIX"))' generates .cpython-311-x86_64-linux-musl.so
3. renaming the .so file to maturin_musl_fail.cpython-311-x86_64-linux-musl.so (changing gnu to musl) solves the issue and I can load the module.

Therefore I will now try to understand the source code of https://github.com/PyO3/maturin-action as it's probably what is setting the EXT_SUFFIX wrongly.

Any help understanding this is appreciated :)

Best,
Martino

[messense]

See pypa/auditwheel#349, probably alpine updated SOABI on python 3.11, we may have to update in maturin too.

[MartinoMensio]

Thank you very much @messense for looking into this!

Martino

[messense]

To test it, you'll need to use

- uses: PyO3/maturin-action@v1
  with:
    maturin-version: v1.0.0-beta.7

[MartinoMensio]

Thank you very much! I tested it and it works perfectly!

[messense]

@MartinoMensio Fix released in v0.14.17.