Windows: "uv venv" gives "exit 2" with tox-uv

[hugovk]

Windows uv 0.1.4 tox-uv 1.2.0

Using tox-uv, and running python -m tox -e py -vvv on Windows with CPython 3.8-3.13 and PyPy 3.10 gives an error:

ROOT: 156 D setup logging to NOTSET on pid 8056 [tox\report.py:221]
py: 375 W venv> C:\hostedtoolcache\windows\Python\3.8.10\x64\uv venv -p 3.8 D:\a\termcolor\termcolor\.tox\py\.venv [tox\tox_env\api.py:427]
py: 375 C exit 2 (0.00 seconds) D:\a\termcolor\termcolor> C:\hostedtoolcache\windows\Python\3.8.10\x64\uv venv -p 3.8 D:\a\termcolor\termcolor\.tox\py\.venv [tox\execute\api.py:280]
  py: FAIL code 2 (0.00 seconds)
  evaluation failed :( (0.22 seconds)
Error: Process completed with exit code 1.

It passes on Ubuntu and macOS. I don't have a Windows machine, this is on CI:

https://github.com/hugovk/termcolor/actions/runs/7948092300/job/21697697387

To get the code locally:

git clone https://github.com/hugovk/termcolor/
git checkout fd9f3f426449541a111560585c4230e31d2e0adf

Possibly a tox-uv bug?

[ofek]

https://github.com/astral-sh/uv/issues/1310

[hugovk]

Reproducible on Windows with uv 0.1.14 for PyPy 3.9 and 3.10, and CPython 3.13 (via tox-uv 1.4.0):

Run python -m tox -e py -rvvv
.pkg: 4423 W remove tox env folder D:\a\termcolor\termcolor\.tox\.pkg [tox\tox_env\api.py:325]
py: 4470 W venv> C:\hostedtoolcache\windows\PyPy\3.10.13\x86\Scripts\uv.exe venv -p 3.10 -v D:\a\termcolor\termcolor\.tox\py\.venv [tox\tox_env\api.py:427]
 uv_interpreter::python_query::find_requested_python request=3.10
      0.002894s   0ms DEBUG uv_interpreter::python_query Starting interpreter discovery for Python @ `3.10`
      0.003287s   0ms DEBUG uv_interpreter::interpreter Probing interpreter info for: C:\hostedtoolcache\windows\PyPy\3.10.13\x86\python3.10.exe
      0.132933s 130ms DEBUG uv_interpreter::interpreter Found Python 3.10.13 for: C:\hostedtoolcache\windows\PyPy\3.10.13\x86\python3.10.exe
Using Python 3.10.13 interpreter at: C:\hostedtoolcache\windows\PyPy\3.10.13\x86\python3.10.exe
Creating virtualenv at: D:\a\termcolor\termcolor\.tox\py\.venv
uv::venv::creation

  × Failed to create virtualenv
  ├─▶ failed to copy file from
  │   C:\hostedtoolcache\windows\PyPy\3.10.13\x86\Lib\venv\scripts\nt\python.exe
  │   to \\?\D:\a\termcolor\termcolor\.tox\py\.venv\Scripts\python.exe
  ╰─▶ The system cannot find the file specified. (os error 2)
py: 5080 C exit 1 (0.61 seconds) D:\a\termcolor\termcolor> C:\hostedtoolcache\windows\PyPy\3.10.13\x86\Scripts\uv.exe venv -p 3.10 -v D:\a\termcolor\termcolor\.tox\py\.venv pid=6192 [tox\execute\api.py:280]
  py: FAIL code 1 (0.67 seconds)
  evaluation failed :( (4.67 seconds)

Error: Process completed with exit code 1.

https://github.com/hugovk/termcolor/actions/runs/8145079624

CPython 3.8-3.12 pass.

[charliermarsh]

Thanks, let me see if I can repro with a minimal Python 3.13 run.

[charliermarsh]

Reproduced here, thanks! https://github.com/astral-sh/uv/pull/2171

[charliermarsh]

First trying to figure out if we're attempting to copy from the wrong directory, or if we're copying the wrong filename.

[charliermarsh]

@gaborbernat - Do you know if the development builds exclude the venv shims?

[charliermarsh]

I figured this out, I think we're supposed to fallback to venvlauncher.exe if python.exe doesn't exist:

https://github.com/python/cpython/blob/d457345bbc6414db0443819290b04a9a4333313d/Lib/venv/init.py#L270C66-L270C71

[charliermarsh]

I asked a question about it on discuss: https://discuss.python.org/t/when-should-venv-scripts-nt-python-exe-be-present/47620

[charliermarsh]

FYI @gaborbernat -- The executable names changed in Python 3.13: https://discuss.python.org/t/when-should-venv-scripts-nt-python-exe-be-present/47620/2. I suspect virtualenv won't fail because it's robust to the shims not existing.

[hugovk]

Thanks for the CPython 3.13 fix!

This issue is also about PyPy (3.9 and 3.10), does uv need an extra fix there?

[AlexWaygood]

This issue is also about PyPy (3.9 and 3.10), does uv need an extra fix there?

Probably — PyPy isn't officially supported right now, though we'd welcome contributions to help us get there! See #2096