How can I integrate `tox` into `uv`?

[paddyroddy]

I find that tox can take a long time to install dependencies (longer than doing it locally), it would be nice to benefit from uv for this. Think that the relevant bit in tox is here.

[atmartinez]

https://tox.wiki/en/latest/config.html#install_command looks to be a possible solution to putting uv in place of pip

[Czaki]

No, It does not allow as uv is not installed in venv, and you cannot install it when you change install command...

To help myself with this task, I started implementing tox plugin. https://github.com/Czaki/tox-uv

But I hit the bug in uv it do not allow to install with full path to wheel file:

py311-macos-pyqt5-no_cov: install_package> python -I -m uv pip install --force-reinstall --no-deps /tmp/.tox/.tmp/package/5/napari-0.5.0a2.dev578+g17b00de2.tar.gz
error: Failed to parse `/tmp/.tox/.tmp/package/5/napari-0.5.0a2.dev578+g17b00de2.tar.gz`
  Caused by: Expected package name starting with an alphanumeric character, found '/'
/tmp/.tox/.tmp/package/5/napari-0.5.0a2.dev578+g17b00de2.tar.gz

[charliermarsh]

@Czaki -- We can install via a full path, we just require a package name right now (like napari @ /tmp/.tox/.tmp/package/5/napari-0.5.0a2.dev578+g17b00de2.tar.gz).

[Czaki]

@charliermarsh Ok. I do not control this part of tox, and it will need to do hacking that may not be stable. Why provide a full path to sdist or wheel is not enough and require extracting it from the file name?

[charliermarsh]

It's just not implemented yet. In general, we can't read the package name from sdist files (like the one you linked -- that looks like an sdist?) since it doesn't follow any particular spec. Wheels do follow a spec and so we could read the package name from the filename in that case.

[Czaki]

python -m build --sdist do not follow any spec?

[Czaki]

Ok. I have created a workaround. It works nice with wheels, but end with error for sdist:

⠹ Resolving dependencies...                                                                              thread 'main' panicked at crates/uv-resolver/src/resolution.rs:120:26:
Every package should have metadata
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace
py311-macos-pyqt5-no_cov: exit 101 (0.35 seconds) /Users/grzegorzbokota/Documents/Projekty/napari> python -I -m uv pip install --force-reinstall --no-deps 'napari @ /tmp/.tox/.tmp/package/7/napari-0.5.0a2.dev578+g17b00de2.tar.gz' pid=3499

[zanieb]

Related to #313

[Czaki]

tox devs published owns tox-uv plugin https://github.com/tox-dev/tox-uv (but it crashes tox in my case)

[gaborbernat]

@charliermarsh now that https://pypi.org/project/tox-uv/ is launched, I think we can close this. Unless you want to document it somewhere, the advice to use that. sdists seem to still be troublesome occasionally, but otherwise work well.

[charliermarsh]

Closing as tox-uv now exists!