uv versions 0.2.19 and 0.2.20 not respecting wheel dependecies

[atrbgithub]

Given the following:

python --version
Python 3.8.19

uv --version
uv 0.2.20

The error is:

uv pip install dvc==3.42.0
error: No virtual environment found
sh-5.1$ uv venv
Using Python 3.8.19 interpreter at: /some/location/bin/python3
Creating virtualenv at: .venv
sh-5.1$ uv pip install dvc==3.42.0
error: Failed to download and build `voluptuous==0.15.1`
  Caused by: Failed to build: `voluptuous==0.15.1`
  Caused by: Build backend failed to determine extra requires with `build_wheel()` with exit status: 1
--- stdout:

--- stderr:
Traceback (most recent call last):
  File "<string>", line 14, in <module>
  File "/home/a_home_dir/.cache/uv/environments-v0/.tmpvwToiO/lib/python3.8/site-packages/setuptools/build_meta.py", line 327, in get_requires_for_build_wheel
    return self._get_build_requires(config_settings, requirements=[])
  File "/home/a_home_dir/.cache/uv/environments-v0/.tmpvwToiO/lib/python3.8/site-packages/setuptools/build_meta.py", line 297, in _get_build_requires
    self.run_setup()
  File "/home/a_home_dir/.cache/uv/environments-v0/.tmpvwToiO/lib/python3.8/site-packages/setuptools/build_meta.py", line 497, in run_setup
    super().run_setup(setup_script=setup_script)
  File "/home/a_home_dir/.cache/uv/environments-v0/.tmpvwToiO/lib/python3.8/site-packages/setuptools/build_meta.py", line 313, in run_setup
    exec(code, locals())
  File "<string>", line 7, in <module>
  File "/home/a_home_dir/.cache/uv/built-wheels-v3/pypi/voluptuous/0.15.1/MQJft_QmRPeFdMipU2XVd/voluptuous-0.15.1.tar.gz/./voluptuous/__init__.py", line 78, in <module>
    from voluptuous.schema_builder import *
  File "/home/a_home_dir/.cache/uv/built-wheels-v3/pypi/voluptuous/0.15.1/MQJft_QmRPeFdMipU2XVd/voluptuous-0.15.1.tar.gz/./voluptuous/schema_builder.py", line 13, in <module>
    from functools import cache, wraps
ImportError: cannot import name 'cache' from 'functools' (/some/location/lib/python3.8/functools.py)
---

This also fails with uv 0.2.19

It works with 0.2.18, which installs the correct supported package:

 + voluptuous==0.14.2

Rather than attempting to install:

voluptuous==0.15.1

As this does not support python 3.8.

[zanieb]

Thanks for the report. We'll look into this.

[zanieb]

I'm a bit suspicious of #4705 / #4707. Probably related to #4885.

[charliermarsh]

I haven't been able to repro this yet with echo "dvc==3.42.0" | uv pip compile - --python-version 3.8.

[zanieb]

I reproduced with

uv venv --python 3.8 --preview
uv pip install dvc==3.42.0

log.txt

[charliermarsh]

Okay, I think this is a prefetching problem. We're no longer filtering by Requires-Python in the prefetching codepath.

[charliermarsh]

Because it was removed from the version map but not "re-added" there.