Sdist build fails in projects with build.py

[gitonthescene]

Hi, I recently upgraded poetry to the latest release and I'm having issues running nox tests. I haven't changed anything other than upgrading poetry and nox.

➜  csv-reconcile git:(develop) ✗ nox --version
 2023.4.22
➜  csv-reconcile git:(develop) ✗ 

Here's my noxfile.py. (Last edited two years ago...)

It looks like the SDIST usage varies from what I found in current documentation, but changing that to use the string didn't seem to help.

Here's the error I'm seeing:

nox > Command python -m pip install --constraint=.nox/test_geo-3-9/tmp/requirements.txt 'file:///Users/xxx/Python/wikidata/csv-reconcile/dist/%280.3.2%29#egg=csv-reconcile' failed with exit code 1:
Processing ./dist/(0.3.2)
ERROR: Could not install packages due to an OSError: [Errno 2] No such file or directory: '/Users/xxxx/Python/wikidata/csv-reconcile/dist/(0.3.2)'

As a wild guess It looks like maybe that (0.3.2) comes from processing poetry output which might have changed??

Using poetry build manually produces the following files:

➜  csv-reconcile git:(develop) ✗ ls dist 
csv_reconcile-0.3.2-cp37-cp37m-macosx_12_0_x86_64.whl csv_reconcile-0.3.2.tar.gz
➜  csv-reconcile git:(develop) ✗ 

I'm not sure where to start debugging this. Any advice you can offer would be greatly appreciated.

Regards

[gitonthescene]

I think this might confirm my guess.

This is what the output looks like with the latest poetry release:

➜  csv-reconcile git:(develop) ✗ poetry build
Preparing build environment with build-system requirements poetry>=0.12, cython, setuptools!=50.0, wheel
Building csv-reconcile (0.3.2)
➜  csv-reconcile git:(develop) ✗ 

[cjolowicz]

This is only triggered in Poetry projects using the undocumented build script support.

Here's a minimal repro:

# pyproject.toml
[tool.poetry]
name = "example"
version = "0.1.0"
description = ""
authors = ["your name <you@example.com>"]
build = "build.py"

[tool.poetry.dependencies]
python = "^3.11"

[build-system]
requires = ["poetry-core"]
build-backend = "poetry.core.masonry.api"

# build.py
def build(setup_kwargs):
    pass

# noxfile.py
from nox_poetry import session

@session
def test(session):
    session.poetry.installroot(distribution_format="sdist")

The rest of the files as generated by poetry new and poetry lock.

Running nox:

❯ nox
nox > Running session test
nox > Creating virtual environment (virtualenv) using python in .nox/test
nox > poetry build --format=sdist --no-ansi

Preparing build environment with build-system requirements poetry-corenox > poetry --version --no-ansi
nox > poetry export --format=requirements.txt --without-hashes
nox > pip uninstall --yes 'file:///private/var/folders/x1/jpjk1s6n39qbb5wxldt5ms6c0000gn/T/tmp.i3TGU7yXyi/example/dist/%280.1.0%29#egg=example'
nox > pip cache remove example
nox > python -m pip install --constraint=.nox/test/tmp/requirements.txt 'file:///private/var/folders/x1/jpjk1s6n39qbb5wxldt5ms6c0000gn/T/tmp.i3TGU7yXyi/example/dist/%280.1.0%29#egg=example'
nox > Command python -m pip install --constraint=.nox/test/tmp/requirements.txt 'file:///private/var/folders/x1/jpjk1s6n39qbb5wxldt5ms6c0000gn/T/tmp.i3TGU7yXyi/example/dist/%280.1.0%29#egg=example' failed with exit code 1:
Processing ./dist/(0.1.0)
ERROR: Could not install packages due to an OSError: [Errno 2] No such file or directory: '/private/var/folders/x1/jpjk1s6n39qbb5wxldt5ms6c0000gn/T/tmp.i3TGU7yXyi/example/dist/(0.1.0)'

nox > Session test failed.

Running Poetry:

❯ poetry build
Preparing build environment with build-system requirements poetry-core
Building example (0.1.0)

Running Poetry without build script:

❯ poetry build
Building example (0.1.0)
  - Building sdist
  - Built example-0.1.0.tar.gz
  - Building wheel
  - Built example-0.1.0-py3-none-any.whl

[cjolowicz]

Nox currently doesn't have a good way to invoke PEP 517 build hooks like build_sdist (which would take the build directory and return the name of the generated file). So I'd suggest the following, less appealing fix in the nox_poetry.poetry.Poetry.build method:

• Extract the filename from the output of poetry build, as before.
• If the file exists in the dist directory, return it.
• Otherwise, construct a glob from the name and version in pyproject.toml (using nox_poetry.poetry.Config)
• If the glob matches a unique existing file in the dist directory, return it.
• Otherwise, raise a friendly error.

Note that tool.poetry.version may not match the version component in the sdist filename. The version could be computed dynamically, and it could be non-PEP 440 format. So this is not perfect, but likely good enough for now?

I'm open for better suggestions. Calling the build hook in a robust, cross-platform way would be great, but I don't really see how. If there was a mechanism to invoke poetry build in a pristine build directory (rather than cleaning out files ourselves), that would also be a great option. Again, this doesn't seem to be supported.

[drhagen]

The poetry version --short command gives the version for the current Poetry project. Might that work?