tox-uv fails on variable interpolation when interpreter is unavailable

## Issue



Consider following `tox.ini`.

```ini
[tox]
minversion = 4.18.0
envlist =
    py39
    py310
    py311
    py312
    py313
skip_missing_interpreters = true

[testenv]
setenv =
    MYVAR = {env:MYVAR:{envsitepackagesdir}/something}
uv_python_preference = only-system
command = echo $MYVAR
```

When I run `tox` without `tox-uv` installed, it passes and correctly skips all unavailable python interpreters. However, when `tox-uv` is installed, exception is raised and job ends in `FAIL` state instead of `SKIP`.

This is probably caused by env interpolation, because when I omit `{envsitepackagesdir}` from the variable default, everything works as expected.

## Environment

Provide at least:

- OS: Linux, Debian trixie

<details open>
<summary>Output of <code>pip list</code> of the host Python, where <code>tox</code> is installed</summary>

```console
Package       Version
------------- -------
cachetools    5.5.2
chardet       5.2.0
colorama      0.4.6
distlib       0.3.9
filelock      3.18.0
packaging     24.2
pip           24.3.1
platformdirs  4.3.6
pluggy        1.5.0
pyproject-api 1.9.0
tox           4.24.2
tox-uv        1.25.0
uv            0.6.7
virtualenv    20.29.3
```

</details>

## Output of running tox

<details open>
<summary>Output of <code>tox -rvv</code></summary>

```console
py39: 1602 W remove tox env folder /home/jmusilek/test/tox-uv-fail/.tox/py39 [tox/tox_env/api.py:332]
py39: 1646 W venv> .direnv/python-3.12.8/bin/uv venv -p cpython3.9 --allow-existing -v --python-preference only-system /home/jmusilek/test/tox-uv-fail/.tox/py39 [tox/tox_env/api.py:434]
DEBUG uv 0.6.7
DEBUG Using Python request `cpython@3.9` from explicit request
DEBUG Searching for CPython 3.9 in search path
DEBUG Found `cpython-3.12.8-linux-x86_64-gnu` at `/home/jmusilek/test/tox-uv-fail/.direnv/python-3.12.8/bin/python3` (first executable in the search path)
DEBUG Ignoring Python interpreter at `/home/jmusilek/test/tox-uv-fail/.direnv/python-3.12.8/bin/python3`: system interpreter required
DEBUG Found `cpython-3.12.8-linux-x86_64-gnu` at `/home/jmusilek/test/tox-uv-fail/.direnv/python-3.12.8/bin/python` (search path)
DEBUG Ignoring Python interpreter at `/home/jmusilek/test/tox-uv-fail/.direnv/python-3.12.8/bin/python`: system interpreter required
DEBUG Found `cpython-3.12.8-linux-x86_64-gnu` at `/usr/bin/python3` (search path)
DEBUG Skipping interpreter at `/usr/bin/python3` from search path: does not satisfy request `3.9`
DEBUG Found `cpython-3.12.8-linux-x86_64-gnu` at `/bin/python3` (search path)
DEBUG Skipping interpreter at `/bin/python3` from search path: does not satisfy request `3.9`
  × No interpreter found for CPython 3.9 in search path
py39: 1727 E internal error [tox/session/cmd/run/single.py:60]
Traceback (most recent call last):
  File "/home/jmusilek/test/tox-uv-fail/.direnv/python-3.12.8/lib/python3.12/site-packages/tox/config/loader/ini/__init__.py", line 77, in replacer
    replaced = replace(conf, reference_replacer, raw_, args_)  # do replacements
               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/jmusilek/test/tox-uv-fail/.direnv/python-3.12.8/lib/python3.12/site-packages/tox/config/loader/replacer.py", line 70, in replace
    return Replacer(conf, reference, conf_args=args, depth=depth).join(find_replace_expr(value))
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/jmusilek/test/tox-uv-fail/.direnv/python-3.12.8/lib/python3.12/site-packages/tox/config/loader/replacer.py", line 199, in join
    return "".join(self(value))
                   ^^^^^^^^^^^
  File "/home/jmusilek/test/tox-uv-fail/.direnv/python-3.12.8/lib/python3.12/site-packages/tox/config/loader/replacer.py", line 196, in __call__
    return [self._replace_match(me) if isinstance(me, MatchExpression) else str(me) for me in value]
            ^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/jmusilek/test/tox-uv-fail/.direnv/python-3.12.8/lib/python3.12/site-packages/tox/config/loader/replacer.py", line 204, in _replace_match
    flattened_args = [self.join(arg) for arg in value.expr]
                      ^^^^^^^^^^^^^^
  File "/home/jmusilek/test/tox-uv-fail/.direnv/python-3.12.8/lib/python3.12/site-packages/tox/config/loader/replacer.py", line 199, in join
    return "".join(self(value))
                   ^^^^^^^^^^^
  File "/home/jmusilek/test/tox-uv-fail/.direnv/python-3.12.8/lib/python3.12/site-packages/tox/config/loader/replacer.py", line 196, in __call__
    return [self._replace_match(me) if isinstance(me, MatchExpression) else str(me) for me in value]
            ^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/jmusilek/test/tox-uv-fail/.direnv/python-3.12.8/lib/python3.12/site-packages/tox/config/loader/replacer.py", line 218, in _replace_match
    replace_value = self.reference(arg_value, conf_args)
                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/jmusilek/test/tox-uv-fail/.direnv/python-3.12.8/lib/python3.12/site-packages/tox/config/loader/ini/replace.py", line 58, in __call__
    raise exception
  File "/home/jmusilek/test/tox-uv-fail/.direnv/python-3.12.8/lib/python3.12/site-packages/tox/config/loader/ini/replace.py", line 42, in __call__
    value = src.load(key, conf_args.chain)
            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/jmusilek/test/tox-uv-fail/.direnv/python-3.12.8/lib/python3.12/site-packages/tox/config/sets.py", line 133, in load
    return config_definition.__call__(self._conf, self.loaders, ConfigLoadArgs(chain, self.name, self.env_name))  # noqa: PLC2801
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/jmusilek/test/tox-uv-fail/.direnv/python-3.12.8/lib/python3.12/site-packages/tox/config/of_type.py", line 60, in __call__
    return self.value() if callable(self.value) else self.value
           ^^^^^^^^^^^^
  File "/home/jmusilek/test/tox-uv-fail/.direnv/python-3.12.8/lib/python3.12/site-packages/tox_uv/_venv.py", line 250, in env_site_package_dir
    py = self._py_info
         ^^^^^^^^^^^^^
  File "/usr/lib/python3.12/functools.py", line 995, in __get__
    val = self.func(instance)
          ^^^^^^^^^^^^^^^^^^^
  File "/home/jmusilek/test/tox-uv-fail/.direnv/python-3.12.8/lib/python3.12/site-packages/tox_uv/_venv.py", line 283, in _py_info
    self.create_python_env()
  File "/home/jmusilek/test/tox-uv-fail/.direnv/python-3.12.8/lib/python3.12/site-packages/tox_uv/_venv.py", line 222, in create_python_env
    raise Skip(msg)
tox.tox_env.errors.Skip: could not find python interpreter with spec(s): cpython3.9

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "/home/jmusilek/test/tox-uv-fail/.direnv/python-3.12.8/lib/python3.12/site-packages/tox/session/cmd/run/single.py", line 47, in _evaluate
    tox_env.setup()
  File "/home/jmusilek/test/tox-uv-fail/.direnv/python-3.12.8/lib/python3.12/site-packages/tox/tox_env/api.py", line 257, in setup
    self._setup_env()
  File "/home/jmusilek/test/tox-uv-fail/.direnv/python-3.12.8/lib/python3.12/site-packages/tox/tox_env/python/runner.py", line 98, in _setup_env
    super()._setup_env()
  File "/home/jmusilek/test/tox-uv-fail/.direnv/python-3.12.8/lib/python3.12/site-packages/tox/tox_env/python/api.py", line 231, in _setup_env
    self.ensure_python_env()
  File "/home/jmusilek/test/tox-uv-fail/.direnv/python-3.12.8/lib/python3.12/site-packages/tox/tox_env/python/api.py", line 238, in ensure_python_env
    self.create_python_env()
  File "/home/jmusilek/test/tox-uv-fail/.direnv/python-3.12.8/lib/python3.12/site-packages/tox_uv/_venv.py", line 213, in create_python_env
    if self.conf["system_site_packages"]:
       ~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/jmusilek/test/tox-uv-fail/.direnv/python-3.12.8/lib/python3.12/site-packages/tox/config/sets.py", line 122, in __getitem__
    return self.load(item)
           ^^^^^^^^^^^^^^^
  File "/home/jmusilek/test/tox-uv-fail/.direnv/python-3.12.8/lib/python3.12/site-packages/tox/config/sets.py", line 133, in load
    return config_definition.__call__(self._conf, self.loaders, ConfigLoadArgs(chain, self.name, self.env_name))  # noqa: PLC2801
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/jmusilek/test/tox-uv-fail/.direnv/python-3.12.8/lib/python3.12/site-packages/tox/config/of_type.py", line 117, in __call__
    value = self.default(conf, args.env_name) if callable(self.default) else self.default
            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/jmusilek/test/tox-uv-fail/.direnv/python-3.12.8/lib/python3.12/site-packages/tox_uv/_venv.py", line 69, in <lambda>
    self.environment_variables.get("VIRTUALENV_SYSTEM_SITE_PACKAGES", "False"),
    ^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/jmusilek/test/tox-uv-fail/.direnv/python-3.12.8/lib/python3.12/site-packages/tox_uv/_venv.py", line 184, in environment_variables
    env = super().environment_variables
          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/jmusilek/test/tox-uv-fail/.direnv/python-3.12.8/lib/python3.12/site-packages/tox/tox_env/runner.py", line 193, in environment_variables
    environment_variables = super().environment_variables
                            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/jmusilek/test/tox-uv-fail/.direnv/python-3.12.8/lib/python3.12/site-packages/tox/tox_env/api.py", line 351, in environment_variables
    result[key] = set_env.load(key)
                  ^^^^^^^^^^^^^^^^^
  File "/home/jmusilek/test/tox-uv-fail/.direnv/python-3.12.8/lib/python3.12/site-packages/tox/config/set_env.py", line 90, in load
    result = self._replacer(raw, args)  # apply any replace options
             ^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/jmusilek/test/tox-uv-fail/.direnv/python-3.12.8/lib/python3.12/site-packages/tox/config/loader/ini/__init__.py", line 83, in replacer
    raise HandledError(msg) from exception
tox.report.HandledError: replace failed in py39.setenv with Skip('could not find python interpreter with spec(s): cpython3.9')
py39: FAIL ✖ in 0.15 seconds
py310: 1751 W remove tox env folder /home/jmusilek/test/tox-uv-fail/.tox/py310 [tox/tox_env/api.py:332]
py310: 1776 W venv> .direnv/python-3.12.8/bin/uv venv -p cpython3.10 --allow-existing -v --python-preference only-system /home/jmusilek/test/tox-uv-fail/.tox/py310 [tox/tox_env/api.py:434]
DEBUG uv 0.6.7
DEBUG Using Python request `cpython@3.10` from explicit request
DEBUG Searching for CPython 3.10 in search path
DEBUG Found `cpython-3.12.8-linux-x86_64-gnu` at `/home/jmusilek/test/tox-uv-fail/.direnv/python-3.12.8/bin/python3` (first executable in the search path)
DEBUG Ignoring Python interpreter at `/home/jmusilek/test/tox-uv-fail/.direnv/python-3.12.8/bin/python3`: system interpreter required
DEBUG Found `cpython-3.12.8-linux-x86_64-gnu` at `/home/jmusilek/test/tox-uv-fail/.direnv/python-3.12.8/bin/python` (search path)
DEBUG Ignoring Python interpreter at `/home/jmusilek/test/tox-uv-fail/.direnv/python-3.12.8/bin/python`: system interpreter required
DEBUG Found `cpython-3.10.9-linux-x86_64-gnu` at `/usr/bin/python3.10` (search path)
Using CPython 3.10.9 interpreter at: /usr/bin/python3.10
Creating virtual environment at: .tox/py310
DEBUG Using base executable for virtual environment: /usr/bin/python3.10
DEBUG Allowing existing directory
py310: 1847 I exit 0 (0.07 seconds) /home/jmusilek/test/tox-uv-fail> .direnv/python-3.12.8/bin/uv venv -p cpython3.10 --allow-existing -v --python-preference only-system /home/jmusilek/test/tox-uv-fail/.tox/py310 pid=3517475 [tox/execute/api.py:294]
py310: 1856 W venv-query> .tox/py310/bin/python /home/jmusilek/test/tox-uv-fail/.direnv/python-3.12.8/lib/python3.12/site-packages/tox_uv/_venv_query.py [tox/tox_env/api.py:434]
py310: 2083 I exit 0 (0.22 seconds) /home/jmusilek/test/tox-uv-fail> .tox/py310/bin/python /home/jmusilek/test/tox-uv-fail/.direnv/python-3.12.8/lib/python3.12/site-packages/tox_uv/_venv_query.py pid=3517483 [tox/execute/api.py:294]
py310: 2088 W venv> .direnv/python-3.12.8/bin/uv venv -p cpython3.10 --allow-existing -v --python-preference only-system /home/jmusilek/test/tox-uv-fail/.tox/py310 [tox/tox_env/api.py:434]
DEBUG uv 0.6.7
DEBUG Using Python request `cpython@3.10` from explicit request
DEBUG Searching for CPython 3.10 in search path
DEBUG Found `cpython-3.10.9-linux-x86_64-gnu` at `/home/jmusilek/test/tox-uv-fail/.tox/py310/bin/python3.10` (first executable in the search path)
DEBUG Ignoring Python interpreter at `/home/jmusilek/test/tox-uv-fail/.tox/py310/bin/python3.10`: system interpreter required
DEBUG Found `cpython-3.10.9-linux-x86_64-gnu` at `/home/jmusilek/test/tox-uv-fail/.tox/py310/bin/python3` (search path)
DEBUG Ignoring Python interpreter at `/home/jmusilek/test/tox-uv-fail/.tox/py310/bin/python3`: system interpreter required
DEBUG Found `cpython-3.10.9-linux-x86_64-gnu` at `/home/jmusilek/test/tox-uv-fail/.tox/py310/bin/python` (search path)
DEBUG Ignoring Python interpreter at `/home/jmusilek/test/tox-uv-fail/.tox/py310/bin/python`: system interpreter required
DEBUG Found `cpython-3.12.8-linux-x86_64-gnu` at `/home/jmusilek/test/tox-uv-fail/.direnv/python-3.12.8/bin/python3` (search path)
DEBUG Ignoring Python interpreter at `/home/jmusilek/test/tox-uv-fail/.direnv/python-3.12.8/bin/python3`: system interpreter required
DEBUG Found `cpython-3.12.8-linux-x86_64-gnu` at `/home/jmusilek/test/tox-uv-fail/.direnv/python-3.12.8/bin/python` (search path)
DEBUG Ignoring Python interpreter at `/home/jmusilek/test/tox-uv-fail/.direnv/python-3.12.8/bin/python`: system interpreter required
DEBUG Found `cpython-3.10.9-linux-x86_64-gnu` at `/usr/bin/python3.10` (search path)
Using CPython 3.10.9 interpreter at: /usr/bin/python3.10
Creating virtual environment at: .tox/py310
DEBUG Using base executable for virtual environment: /usr/bin/python3.10
DEBUG Allowing existing directory
py310: 2158 I exit 0 (0.07 seconds) /home/jmusilek/test/tox-uv-fail> .direnv/python-3.12.8/bin/uv venv -p cpython3.10 --allow-existing -v --python-preference only-system /home/jmusilek/test/tox-uv-fail/.tox/py310 pid=3517488 [tox/execute/api.py:294]
py311: 2165 W remove tox env folder /home/jmusilek/test/tox-uv-fail/.tox/py311 [tox/tox_env/api.py:332]
py310: OK ✔ in 0.42 seconds
py311: 2188 W venv> .direnv/python-3.12.8/bin/uv venv -p cpython3.11 --allow-existing -v --python-preference only-system /home/jmusilek/test/tox-uv-fail/.tox/py311 [tox/tox_env/api.py:434]
DEBUG uv 0.6.7
DEBUG Using Python request `cpython@3.11` from explicit request
DEBUG Searching for CPython 3.11 in search path
DEBUG Found `cpython-3.12.8-linux-x86_64-gnu` at `/home/jmusilek/test/tox-uv-fail/.direnv/python-3.12.8/bin/python3` (first executable in the search path)
DEBUG Ignoring Python interpreter at `/home/jmusilek/test/tox-uv-fail/.direnv/python-3.12.8/bin/python3`: system interpreter required
DEBUG Found `cpython-3.12.8-linux-x86_64-gnu` at `/home/jmusilek/test/tox-uv-fail/.direnv/python-3.12.8/bin/python` (search path)
DEBUG Ignoring Python interpreter at `/home/jmusilek/test/tox-uv-fail/.direnv/python-3.12.8/bin/python`: system interpreter required
DEBUG Found `cpython-3.11.8-linux-x86_64-gnu` at `/usr/bin/python3.11` (search path)
Using CPython 3.11.8 interpreter at: /usr/bin/python3.11
Creating virtual environment at: .tox/py311
DEBUG Using base executable for virtual environment: /usr/bin/python3.11
DEBUG Allowing existing directory
py311: 2249 I exit 0 (0.06 seconds) /home/jmusilek/test/tox-uv-fail> .direnv/python-3.12.8/bin/uv venv -p cpython3.11 --allow-existing -v --python-preference only-system /home/jmusilek/test/tox-uv-fail/.tox/py311 pid=3517500 [tox/execute/api.py:294]
py311: 2254 W venv-query> .tox/py311/bin/python /home/jmusilek/test/tox-uv-fail/.direnv/python-3.12.8/lib/python3.12/site-packages/tox_uv/_venv_query.py [tox/tox_env/api.py:434]
py311: 2455 I exit 0 (0.20 seconds) /home/jmusilek/test/tox-uv-fail> .tox/py311/bin/python /home/jmusilek/test/tox-uv-fail/.direnv/python-3.12.8/lib/python3.12/site-packages/tox_uv/_venv_query.py pid=3517508 [tox/execute/api.py:294]
py311: 2462 W venv> .direnv/python-3.12.8/bin/uv venv -p cpython3.11 --allow-existing -v --python-preference only-system /home/jmusilek/test/tox-uv-fail/.tox/py311 [tox/tox_env/api.py:434]
DEBUG uv 0.6.7
DEBUG Using Python request `cpython@3.11` from explicit request
DEBUG Searching for CPython 3.11 in search path
DEBUG Found `cpython-3.11.8-linux-x86_64-gnu` at `/home/jmusilek/test/tox-uv-fail/.tox/py311/bin/python3.11` (first executable in the search path)
DEBUG Ignoring Python interpreter at `/home/jmusilek/test/tox-uv-fail/.tox/py311/bin/python3.11`: system interpreter required
DEBUG Found `cpython-3.11.8-linux-x86_64-gnu` at `/home/jmusilek/test/tox-uv-fail/.tox/py311/bin/python3` (search path)
DEBUG Ignoring Python interpreter at `/home/jmusilek/test/tox-uv-fail/.tox/py311/bin/python3`: system interpreter required
DEBUG Found `cpython-3.11.8-linux-x86_64-gnu` at `/home/jmusilek/test/tox-uv-fail/.tox/py311/bin/python` (search path)
DEBUG Ignoring Python interpreter at `/home/jmusilek/test/tox-uv-fail/.tox/py311/bin/python`: system interpreter required
DEBUG Found `cpython-3.12.8-linux-x86_64-gnu` at `/home/jmusilek/test/tox-uv-fail/.direnv/python-3.12.8/bin/python3` (search path)
DEBUG Ignoring Python interpreter at `/home/jmusilek/test/tox-uv-fail/.direnv/python-3.12.8/bin/python3`: system interpreter required
DEBUG Found `cpython-3.12.8-linux-x86_64-gnu` at `/home/jmusilek/test/tox-uv-fail/.direnv/python-3.12.8/bin/python` (search path)
DEBUG Ignoring Python interpreter at `/home/jmusilek/test/tox-uv-fail/.direnv/python-3.12.8/bin/python`: system interpreter required
DEBUG Found `cpython-3.11.8-linux-x86_64-gnu` at `/usr/bin/python3.11` (search path)
Using CPython 3.11.8 interpreter at: /usr/bin/python3.11
Creating virtual environment at: .tox/py311
DEBUG Using base executable for virtual environment: /usr/bin/python3.11
DEBUG Allowing existing directory
py311: 2526 I exit 0 (0.06 seconds) /home/jmusilek/test/tox-uv-fail> .direnv/python-3.12.8/bin/uv venv -p cpython3.11 --allow-existing -v --python-preference only-system /home/jmusilek/test/tox-uv-fail/.tox/py311 pid=3517513 [tox/execute/api.py:294]
py312: 2533 W remove tox env folder /home/jmusilek/test/tox-uv-fail/.tox/py312 [tox/tox_env/api.py:332]
py311: OK ✔ in 0.37 seconds
py312: 2563 W venv> .direnv/python-3.12.8/bin/uv venv -p /home/jmusilek/test/tox-uv-fail/.direnv/python-3.12.8/bin/python3 --allow-existing -v --python-preference only-system /home/jmusilek/test/tox-uv-fail/.tox/py312 [tox/tox_env/api.py:434]
DEBUG uv 0.6.7
DEBUG Using Python request `/home/jmusilek/test/tox-uv-fail/.direnv/python-3.12.8/bin/python3` from explicit request
DEBUG Checking for Python interpreter at path `.direnv/python-3.12.8/bin/python3`
Using CPython 3.12.8 interpreter at: .direnv/python-3.12.8/bin/python3
Creating virtual environment at: .tox/py312
DEBUG Using base executable for virtual environment: /usr/bin/python3.12
DEBUG Allowing existing directory
py312: 2636 I exit 0 (0.07 seconds) /home/jmusilek/test/tox-uv-fail> .direnv/python-3.12.8/bin/uv venv -p /home/jmusilek/test/tox-uv-fail/.direnv/python-3.12.8/bin/python3 --allow-existing -v --python-preference only-system /home/jmusilek/test/tox-uv-fail/.tox/py312 pid=3517525 [tox/execute/api.py:294]
py312: 2643 W venv-query> .tox/py312/bin/python /home/jmusilek/test/tox-uv-fail/.direnv/python-3.12.8/lib/python3.12/site-packages/tox_uv/_venv_query.py [tox/tox_env/api.py:434]
py312: 2844 I exit 0 (0.20 seconds) /home/jmusilek/test/tox-uv-fail> .tox/py312/bin/python /home/jmusilek/test/tox-uv-fail/.direnv/python-3.12.8/lib/python3.12/site-packages/tox_uv/_venv_query.py pid=3517532 [tox/execute/api.py:294]
py312: 2849 W venv> .direnv/python-3.12.8/bin/uv venv -p /home/jmusilek/test/tox-uv-fail/.direnv/python-3.12.8/bin/python3 --allow-existing -v --python-preference only-system /home/jmusilek/test/tox-uv-fail/.tox/py312 [tox/tox_env/api.py:434]
DEBUG uv 0.6.7
DEBUG Using Python request `/home/jmusilek/test/tox-uv-fail/.direnv/python-3.12.8/bin/python3` from explicit request
DEBUG Checking for Python interpreter at path `.direnv/python-3.12.8/bin/python3`
Using CPython 3.12.8 interpreter at: .direnv/python-3.12.8/bin/python3
Creating virtual environment at: .tox/py312
DEBUG Using base executable for virtual environment: /usr/bin/python3.12
DEBUG Allowing existing directory
py312: 2917 I exit 0 (0.06 seconds) /home/jmusilek/test/tox-uv-fail> .direnv/python-3.12.8/bin/uv venv -p /home/jmusilek/test/tox-uv-fail/.direnv/python-3.12.8/bin/python3 --allow-existing -v --python-preference only-system /home/jmusilek/test/tox-uv-fail/.tox/py312 pid=3517538 [tox/execute/api.py:294]
py313: 2924 W remove tox env folder /home/jmusilek/test/tox-uv-fail/.tox/py313 [tox/tox_env/api.py:332]
py312: OK ✔ in 0.39 seconds
py313: 2945 W venv> .direnv/python-3.12.8/bin/uv venv -p cpython3.13 --allow-existing -v --python-preference only-system /home/jmusilek/test/tox-uv-fail/.tox/py313 [tox/tox_env/api.py:434]
DEBUG uv 0.6.7
DEBUG Using Python request `cpython@3.13` from explicit request
DEBUG Searching for CPython 3.13 in search path
DEBUG Found `cpython-3.12.8-linux-x86_64-gnu` at `/home/jmusilek/test/tox-uv-fail/.direnv/python-3.12.8/bin/python3` (first executable in the search path)
DEBUG Ignoring Python interpreter at `/home/jmusilek/test/tox-uv-fail/.direnv/python-3.12.8/bin/python3`: system interpreter required
DEBUG Found `cpython-3.12.8-linux-x86_64-gnu` at `/home/jmusilek/test/tox-uv-fail/.direnv/python-3.12.8/bin/python` (search path)
DEBUG Ignoring Python interpreter at `/home/jmusilek/test/tox-uv-fail/.direnv/python-3.12.8/bin/python`: system interpreter required
DEBUG Found `cpython-3.12.8-linux-x86_64-gnu` at `/usr/bin/python3` (search path)
DEBUG Skipping interpreter at `/usr/bin/python3` from search path: does not satisfy request `3.13`
DEBUG Found `cpython-3.12.8-linux-x86_64-gnu` at `/bin/python3` (search path)
DEBUG Skipping interpreter at `/bin/python3` from search path: does not satisfy request `3.13`
  × No interpreter found for CPython 3.13 in search path
py313: 3016 E internal error [tox/session/cmd/run/single.py:60]
Traceback (most recent call last):
  File "/home/jmusilek/test/tox-uv-fail/.direnv/python-3.12.8/lib/python3.12/site-packages/tox/config/loader/ini/__init__.py", line 77, in replacer
    replaced = replace(conf, reference_replacer, raw_, args_)  # do replacements
               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/jmusilek/test/tox-uv-fail/.direnv/python-3.12.8/lib/python3.12/site-packages/tox/config/loader/replacer.py", line 70, in replace
    return Replacer(conf, reference, conf_args=args, depth=depth).join(find_replace_expr(value))
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/jmusilek/test/tox-uv-fail/.direnv/python-3.12.8/lib/python3.12/site-packages/tox/config/loader/replacer.py", line 199, in join
    return "".join(self(value))
                   ^^^^^^^^^^^
  File "/home/jmusilek/test/tox-uv-fail/.direnv/python-3.12.8/lib/python3.12/site-packages/tox/config/loader/replacer.py", line 196, in __call__
    return [self._replace_match(me) if isinstance(me, MatchExpression) else str(me) for me in value]
            ^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/jmusilek/test/tox-uv-fail/.direnv/python-3.12.8/lib/python3.12/site-packages/tox/config/loader/replacer.py", line 204, in _replace_match
    flattened_args = [self.join(arg) for arg in value.expr]
                      ^^^^^^^^^^^^^^
  File "/home/jmusilek/test/tox-uv-fail/.direnv/python-3.12.8/lib/python3.12/site-packages/tox/config/loader/replacer.py", line 199, in join
    return "".join(self(value))
                   ^^^^^^^^^^^
  File "/home/jmusilek/test/tox-uv-fail/.direnv/python-3.12.8/lib/python3.12/site-packages/tox/config/loader/replacer.py", line 196, in __call__
    return [self._replace_match(me) if isinstance(me, MatchExpression) else str(me) for me in value]
            ^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/jmusilek/test/tox-uv-fail/.direnv/python-3.12.8/lib/python3.12/site-packages/tox/config/loader/replacer.py", line 218, in _replace_match
    replace_value = self.reference(arg_value, conf_args)
                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/jmusilek/test/tox-uv-fail/.direnv/python-3.12.8/lib/python3.12/site-packages/tox/config/loader/ini/replace.py", line 58, in __call__
    raise exception
  File "/home/jmusilek/test/tox-uv-fail/.direnv/python-3.12.8/lib/python3.12/site-packages/tox/config/loader/ini/replace.py", line 42, in __call__
    value = src.load(key, conf_args.chain)
            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/jmusilek/test/tox-uv-fail/.direnv/python-3.12.8/lib/python3.12/site-packages/tox/config/sets.py", line 133, in load
    return config_definition.__call__(self._conf, self.loaders, ConfigLoadArgs(chain, self.name, self.env_name))  # noqa: PLC2801
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/jmusilek/test/tox-uv-fail/.direnv/python-3.12.8/lib/python3.12/site-packages/tox/config/of_type.py", line 60, in __call__
    return self.value() if callable(self.value) else self.value
           ^^^^^^^^^^^^
  File "/home/jmusilek/test/tox-uv-fail/.direnv/python-3.12.8/lib/python3.12/site-packages/tox_uv/_venv.py", line 250, in env_site_package_dir
    py = self._py_info
         ^^^^^^^^^^^^^
  File "/usr/lib/python3.12/functools.py", line 995, in __get__
    val = self.func(instance)
          ^^^^^^^^^^^^^^^^^^^
  File "/home/jmusilek/test/tox-uv-fail/.direnv/python-3.12.8/lib/python3.12/site-packages/tox_uv/_venv.py", line 283, in _py_info
    self.create_python_env()
  File "/home/jmusilek/test/tox-uv-fail/.direnv/python-3.12.8/lib/python3.12/site-packages/tox_uv/_venv.py", line 222, in create[I] (3.12.8) jmusilek@alfheim:~/t/tox-uv-fail [255] $ rm .tox -rf
[I] (3.12.8) jmusilek@alfheim:~/t/tox-uv-fail $ tox -rvv
py39: 211 W venv> .direnv/python-3.12.8/bin/uv venv -p cpython3.9 --allow-existing -v --python-preference only-system /home/jmusilek/test/tox-uv-fail/.tox/py39 [tox/tox_env/api.py:434]
DEBUG uv 0.6.7
DEBUG Using Python request `cpython@3.9` from explicit request
DEBUG Searching for CPython 3.9 in search path
DEBUG Found `cpython-3.12.8-linux-x86_64-gnu` at `/home/jmusilek/test/tox-uv-fail/.direnv/python-3.12.8/bin/python3` (first executable in the search path)
DEBUG Ignoring Python interpreter at `/home/jmusilek/test/tox-uv-fail/.direnv/python-3.12.8/bin/python3`: system interpreter required
DEBUG Found `cpython-3.12.8-linux-x86_64-gnu` at `/home/jmusilek/test/tox-uv-fail/.direnv/python-3.12.8/bin/python` (search path)
DEBUG Ignoring Python interpreter at `/home/jmusilek/test/tox-uv-fail/.direnv/python-3.12.8/bin/python`: system interpreter required
DEBUG Found `cpython-3.12.8-linux-x86_64-gnu` at `/usr/bin/python3` (search path)
DEBUG Skipping interpreter at `/usr/bin/python3` from search path: does not satisfy request `3.9`
DEBUG Found `cpython-3.12.8-linux-x86_64-gnu` at `/bin/python3` (search path)
DEBUG Skipping interpreter at `/bin/python3` from search path: does not satisfy request `3.9`
  × No interpreter found for CPython 3.9 in search path
py39: 227 E internal error [tox/session/cmd/run/single.py:60]
Traceback (most recent call last):
  File "/home/jmusilek/test/tox-uv-fail/.direnv/python-3.12.8/lib/python3.12/site-packages/tox/config/loader/ini/__init__.py", line 77, in replacer
    replaced = replace(conf, reference_replacer, raw_, args_)  # do replacements
               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/jmusilek/test/tox-uv-fail/.direnv/python-3.12.8/lib/python3.12/site-packages/tox/config/loader/replacer.py", line 70, in replace
    return Replacer(conf, reference, conf_args=args, depth=depth).join(find_replace_expr(value))
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/jmusilek/test/tox-uv-fail/.direnv/python-3.12.8/lib/python3.12/site-packages/tox/config/loader/replacer.py", line 199, in join
    return "".join(self(value))
                   ^^^^^^^^^^^
  File "/home/jmusilek/test/tox-uv-fail/.direnv/python-3.12.8/lib/python3.12/site-packages/tox/config/loader/replacer.py", line 196, in __call__
    return [self._replace_match(me) if isinstance(me, MatchExpression) else str(me) for me in value]
            ^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/jmusilek/test/tox-uv-fail/.direnv/python-3.12.8/lib/python3.12/site-packages/tox/config/loader/replacer.py", line 204, in _replace_match
    flattened_args = [self.join(arg) for arg in value.expr]
                      ^^^^^^^^^^^^^^
  File "/home/jmusilek/test/tox-uv-fail/.direnv/python-3.12.8/lib/python3.12/site-packages/tox/config/loader/replacer.py", line 199, in join
    return "".join(self(value))
                   ^^^^^^^^^^^
  File "/home/jmusilek/test/tox-uv-fail/.direnv/python-3.12.8/lib/python3.12/site-packages/tox/config/loader/replacer.py", line 196, in __call__
    return [self._replace_match(me) if isinstance(me, MatchExpression) else str(me) for me in value]
            ^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/jmusilek/test/tox-uv-fail/.direnv/python-3.12.8/lib/python3.12/site-packages/tox/config/loader/replacer.py", line 218, in _replace_match
    replace_value = self.reference(arg_value, conf_args)
                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/jmusilek/test/tox-uv-fail/.direnv/python-3.12.8/lib/python3.12/site-packages/tox/config/loader/ini/replace.py", line 58, in __call__
    raise exception
  File "/home/jmusilek/test/tox-uv-fail/.direnv/python-3.12.8/lib/python3.12/site-packages/tox/config/loader/ini/replace.py", line 42, in __call__
    value = src.load(key, conf_args.chain)
            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/jmusilek/test/tox-uv-fail/.direnv/python-3.12.8/lib/python3.12/site-packages/tox/config/sets.py", line 133, in load
    return config_definition.__call__(self._conf, self.loaders, ConfigLoadArgs(chain, self.name, self.env_name))  # noqa: PLC2801
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/jmusilek/test/tox-uv-fail/.direnv/python-3.12.8/lib/python3.12/site-packages/tox/config/of_type.py", line 60, in __call__
    return self.value() if callable(self.value) else self.value
           ^^^^^^^^^^^^
  File "/home/jmusilek/test/tox-uv-fail/.direnv/python-3.12.8/lib/python3.12/site-packages/tox_uv/_venv.py", line 250, in env_site_package_dir
    py = self._py_info
         ^^^^^^^^^^^^^
  File "/usr/lib/python3.12/functools.py", line 995, in __get__
    val = self.func(instance)
          ^^^^^^^^^^^^^^^^^^^
  File "/home/jmusilek/test/tox-uv-fail/.direnv/python-3.12.8/lib/python3.12/site-packages/tox_uv/_venv.py", line 283, in _py_info
    self.create_python_env()
  File "/home/jmusilek/test/tox-uv-fail/.direnv/python-3.12.8/lib/python3.12/site-packages/tox_uv/_venv.py", line 222, in create_python_env
    raise Skip(msg)
tox.tox_env.errors.Skip: could not find python interpreter with spec(s): cpython3.9

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "/home/jmusilek/test/tox-uv-fail/.direnv/python-3.12.8/lib/python3.12/site-packages/tox/session/cmd/run/single.py", line 47, in _evaluate
    tox_env.setup()
  File "/home/jmusilek/test/tox-uv-fail/.direnv/python-3.12.8/lib/python3.12/site-packages/tox/tox_env/api.py", line 257, in setup
    self._setup_env()
  File "/home/jmusilek/test/tox-uv-fail/.direnv/python-3.12.8/lib/python3.12/site-packages/tox/tox_env/python/runner.py", line 98, in _setup_env
    super()._setup_env()
  File "/home/jmusilek/test/tox-uv-fail/.direnv/python-3.12.8/lib/python3.12/site-packages/tox/tox_env/python/api.py", line 231, in _setup_env
    self.ensure_python_env()
  File "/home/jmusilek/test/tox-uv-fail/.direnv/python-3.12.8/lib/python3.12/site-packages/tox/tox_env/python/api.py", line 238, in ensure_python_env
    self.create_python_env()
  File "/home/jmusilek/test/tox-uv-fail/.direnv/python-3.12.8/lib/python3.12/site-packages/tox_uv/_venv.py", line 213, in create_python_env
    if self.conf["system_site_packages"]:
       ~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/jmusilek/test/tox-uv-fail/.direnv/python-3.12.8/lib/python3.12/site-packages/tox/config/sets.py", line 122, in __getitem__
    return self.load(item)
           ^^^^^^^^^^^^^^^
  File "/home/jmusilek/test/tox-uv-fail/.direnv/python-3.12.8/lib/python3.12/site-packages/tox/config/sets.py", line 133, in load
    return config_definition.__call__(self._conf, self.loaders, ConfigLoadArgs(chain, self.name, self.env_name))  # noqa: PLC2801
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/jmusilek/test/tox-uv-fail/.direnv/python-3.12.8/lib/python3.12/site-packages/tox/config/of_type.py", line 117, in __call__
    value = self.default(conf, args.env_name) if callable(self.default) else self.default
            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/jmusilek/test/tox-uv-fail/.direnv/python-3.12.8/lib/python3.12/site-packages/tox_uv/_venv.py", line 69, in <lambda>
    self.environment_variables.get("VIRTUALENV_SYSTEM_SITE_PACKAGES", "False"),
    ^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/jmusilek/test/tox-uv-fail/.direnv/python-3.12.8/lib/python3.12/site-packages/tox_uv/_venv.py", line 184, in environment_variables
    env = super().environment_variables
          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/jmusilek/test/tox-uv-fail/.direnv/python-3.12.8/lib/python3.12/site-packages/tox/tox_env/runner.py", line 193, in environment_variables
    environment_variables = super().environment_variables
                            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/jmusilek/test/tox-uv-fail/.direnv/python-3.12.8/lib/python3.12/site-packages/tox/tox_env/api.py", line 351, in environment_variables
    result[key] = set_env.load(key)
                  ^^^^^^^^^^^^^^^^^
  File "/home/jmusilek/test/tox-uv-fail/.direnv/python-3.12.8/lib/python3.12/site-packages/tox/config/set_env.py", line 90, in load
    result = self._replacer(raw, args)  # apply any replace options
             ^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/jmusilek/test/tox-uv-fail/.direnv/python-3.12.8/lib/python3.12/site-packages/tox/config/loader/ini/__init__.py", line 83, in replacer
    raise HandledError(msg) from exception
tox.report.HandledError: replace failed in py39.setenv with Skip('could not find python interpreter with spec(s): cpython3.9')
py39: FAIL ✖ in 0.03 seconds
py310: 235 W venv> .direnv/python-3.12.8/bin/uv venv -p cpython3.10 --allow-existing -v --python-preference only-system /home/jmusilek/test/tox-uv-fail/.tox/py310 [tox/tox_env/api.py:434]
DEBUG uv 0.6.7
DEBUG Using Python request `cpython@3.10` from explicit request
DEBUG Searching for CPython 3.10 in search path
DEBUG Found `cpython-3.12.8-linux-x86_64-gnu` at `/home/jmusilek/test/tox-uv-fail/.direnv/python-3.12.8/bin/python3` (first executable in the search path)
DEBUG Ignoring Python interpreter at `/home/jmusilek/test/tox-uv-fail/.direnv/python-3.12.8/bin/python3`: system interpreter required
DEBUG Found `cpython-3.12.8-linux-x86_64-gnu` at `/home/jmusilek/test/tox-uv-fail/.direnv/python-3.12.8/bin/python` (search path)
DEBUG Ignoring Python interpreter at `/home/jmusilek/test/tox-uv-fail/.direnv/python-3.12.8/bin/python`: system interpreter required
DEBUG Found `cpython-3.10.9-linux-x86_64-gnu` at `/usr/bin/python3.10` (search path)
Using CPython 3.10.9 interpreter at: /usr/bin/python3.10
Creating virtual environment at: .tox/py310
DEBUG Using base executable for virtual environment: /usr/bin/python3.10
DEBUG Allowing existing directory
py310: 252 I exit 0 (0.02 seconds) /home/jmusilek/test/tox-uv-fail> .direnv/python-3.12.8/bin/uv venv -p cpython3.10 --allow-existing -v --python-preference only-system /home/jmusilek/test/tox-uv-fail/.tox/py310 pid=3517637 [tox/execute/api.py:294]
py310: 254 W venv-query> .tox/py310/bin/python /home/jmusilek/test/tox-uv-fail/.direnv/python-3.12.8/lib/python3.12/site-packages/tox_uv/_venv_query.py [tox/tox_env/api.py:434]
py310: 291 I exit 0 (0.04 seconds) /home/jmusilek/test/tox-uv-fail> .tox/py310/bin/python /home/jmusilek/test/tox-uv-fail/.direnv/python-3.12.8/lib/python3.12/site-packages/tox_uv/_venv_query.py pid=3517645 [tox/execute/api.py:294]
py310: 292 W venv> .direnv/python-3.12.8/bin/uv venv -p cpython3.10 --allow-existing -v --python-preference only-system /home/jmusilek/test/tox-uv-fail/.tox/py310 [tox/tox_env/api.py:434]
DEBUG uv 0.6.7
DEBUG Using Python request `cpython@3.10` from explicit request
DEBUG Searching for CPython 3.10 in search path
DEBUG Found `cpython-3.10.9-linux-x86_64-gnu` at `/home/jmusilek/test/tox-uv-fail/.tox/py310/bin/python3.10` (first executable in the search path)
DEBUG Ignoring Python interpreter at `/home/jmusilek/test/tox-uv-fail/.tox/py310/bin/python3.10`: system interpreter required
DEBUG Found `cpython-3.10.9-linux-x86_64-gnu` at `/home/jmusilek/test/tox-uv-fail/.tox/py310/bin/python3` (search path)
DEBUG Ignoring Python interpreter at `/home/jmusilek/test/tox-uv-fail/.tox/py310/bin/python3`: system interpreter required
DEBUG Found `cpython-3.10.9-linux-x86_64-gnu` at `/home/jmusilek/test/tox-uv-fail/.tox/py310/bin/python` (search path)
DEBUG Ignoring Python interpreter at `/home/jmusilek/test/tox-uv-fail/.tox/py310/bin/python`: system interpreter required
DEBUG Found `cpython-3.12.8-linux-x86_64-gnu` at `/home/jmusilek/test/tox-uv-fail/.direnv/python-3.12.8/bin/python3` (search path)
DEBUG Ignoring Python interpreter at `/home/jmusilek/test/tox-uv-fail/.direnv/python-3.12.8/bin/python3`: system interpreter required
DEBUG Found `cpython-3.12.8-linux-x86_64-gnu` at `/home/jmusilek/test/tox-uv-fail/.direnv/python-3.12.8/bin/python` (search path)
DEBUG Ignoring Python interpreter at `/home/jmusilek/test/tox-uv-fail/.direnv/python-3.12.8/bin/python`: system interpreter required
DEBUG Found `cpython-3.10.9-linux-x86_64-gnu` at `/usr/bin/python3.10` (search path)
Using CPython 3.10.9 interpreter at: /usr/bin/python3.10
Creating virtual environment at: .tox/py310
DEBUG Using base executable for virtual environment: /usr/bin/python3.10
DEBUG Allowing existing directory
py310: 304 I exit 0 (0.01 seconds) /home/jmusilek/test/tox-uv-fail> .direnv/python-3.12.8/bin/uv venv -p cpython3.10 --allow-existing -v --python-preference only-system /home/jmusilek/test/tox-uv-fail/.tox/py310 pid=3517650 [tox/execute/api.py:294]
py310: OK ✔ in 0.08 seconds
py311: 312 W venv> .direnv/python-3.12.8/bin/uv venv -p cpython3.11 --allow-existing -v --python-preference only-system /home/jmusilek/test/tox-uv-fail/.tox/py311 [tox/tox_env/api.py:434]
DEBUG uv 0.6.7
DEBUG Using Python request `cpython@3.11` from explicit request
DEBUG Searching for CPython 3.11 in search path
DEBUG Found `cpython-3.12.8-linux-x86_64-gnu` at `/home/jmusilek/test/tox-uv-fail/.direnv/python-3.12.8/bin/python3` (first executable in the search path)
DEBUG Ignoring Python interpreter at `/home/jmusilek/test/tox-uv-fail/.direnv/python-3.12.8/bin/python3`: system interpreter required
DEBUG Found `cpython-3.12.8-linux-x86_64-gnu` at `/home/jmusilek/test/tox-uv-fail/.direnv/python-3.12.8/bin/python` (search path)
DEBUG Ignoring Python interpreter at `/home/jmusilek/test/tox-uv-fail/.direnv/python-3.12.8/bin/python`: system interpreter required
DEBUG Found `cpython-3.11.8-linux-x86_64-gnu` at `/usr/bin/python3.11` (search path)
Using CPython 3.11.8 interpreter at: /usr/bin/python3.11
Creating virtual environment at: .tox/py311
DEBUG Using base executable for virtual environment: /usr/bin/python3.11
DEBUG Allowing existing directory
py311: 327 I exit 0 (0.01 seconds) /home/jmusilek/test/tox-uv-fail> .direnv/python-3.12.8/bin/uv venv -p cpython3.11 --allow-existing -v --python-preference only-system /home/jmusilek/test/tox-uv-fail/.tox/py311 pid=3517661 [tox/execute/api.py:294]
py311: 328 W venv-query> .tox/py311/bin/python /home/jmusilek/test/tox-uv-fail/.direnv/python-3.12.8/lib/python3.12/site-packages/tox_uv/_venv_query.py [tox/tox_env/api.py:434]
py311: 358 I exit 0 (0.03 seconds) /home/jmusilek/test/tox-uv-fail> .tox/py311/bin/python /home/jmusilek/test/tox-uv-fail/.direnv/python-3.12.8/lib/python3.12/site-packages/tox_uv/_venv_query.py pid=3517668 [tox/execute/api.py:294]
py311: 359 W venv> .direnv/python-3.12.8/bin/uv venv -p cpython3.11 --allow-existing -v --python-preference only-system /home/jmusilek/test/tox-uv-fail/.tox/py311 [tox/tox_env/api.py:434]
DEBUG uv 0.6.7
DEBUG Using Python request `cpython@3.11` from explicit request
DEBUG Searching for CPython 3.11 in search path
DEBUG Found `cpython-3.11.8-linux-x86_64-gnu` at `/home/jmusilek/test/tox-uv-fail/.tox/py311/bin/python3.11` (first executable in the search path)
DEBUG Ignoring Python interpreter at `/home/jmusilek/test/tox-uv-fail/.tox/py311/bin/python3.11`: system interpreter required
DEBUG Found `cpython-3.11.8-linux-x86_64-gnu` at `/home/jmusilek/test/tox-uv-fail/.tox/py311/bin/python3` (search path)
DEBUG Ignoring Python interpreter at `/home/jmusilek/test/tox-uv-fail/.tox/py311/bin/python3`: system interpreter required
DEBUG Found `cpython-3.11.8-linux-x86_64-gnu` at `/home/jmusilek/test/tox-uv-fail/.tox/py311/bin/python` (search path)
DEBUG Ignoring Python interpreter at `/home/jmusilek/test/tox-uv-fail/.tox/py311/bin/python`: system interpreter required
DEBUG Found `cpython-3.12.8-linux-x86_64-gnu` at `/home/jmusilek/test/tox-uv-fail/.direnv/python-3.12.8/bin/python3` (search path)
DEBUG Ignoring Python interpreter at `/home/jmusilek/test/tox-uv-fail/.direnv/python-3.12.8/bin/python3`: system interpreter required
DEBUG Found `cpython-3.12.8-linux-x86_64-gnu` at `/home/jmusilek/test/tox-uv-fail/.direnv/python-3.12.8/bin/python` (search path)
DEBUG Ignoring Python interpreter at `/home/jmusilek/test/tox-uv-fail/.direnv/python-3.12.8/bin/python`: system interpreter required
DEBUG Found `cpython-3.11.8-linux-x86_64-gnu` at `/usr/bin/python3.11` (search path)
Using CPython 3.11.8 interpreter at: /usr/bin/python3.11
Creating virtual environment at: .tox/py311
DEBUG Using base executable for virtual environment: /usr/bin/python3.11
DEBUG Allowing existing directory
py311: 371 I exit 0 (0.01 seconds) /home/jmusilek/test/tox-uv-fail> .direnv/python-3.12.8/bin/uv venv -p cpython3.11 --allow-existing -v --python-preference only-system /home/jmusilek/test/tox-uv-fail/.tox/py311 pid=3517673 [tox/execute/api.py:294]
py311: OK ✔ in 0.07 seconds
py312: 375 W venv> .direnv/python-3.12.8/bin/uv venv -p /home/jmusilek/test/tox-uv-fail/.direnv/python-3.12.8/bin/python3 --allow-existing -v --python-preference only-system /home/jmusilek/test/tox-uv-fail/.tox/py312 [tox/tox_env/api.py:434]
DEBUG uv 0.6.7
DEBUG Using Python request `/home/jmusilek/test/tox-uv-fail/.direnv/python-3.12.8/bin/python3` from explicit request
DEBUG Checking for Python interpreter at path `.direnv/python-3.12.8/bin/python3`
Using CPython 3.12.8 interpreter at: .direnv/python-3.12.8/bin/python3
Creating virtual environment at: .tox/py312
DEBUG Using base executable for virtual environment: /usr/bin/python3.12
DEBUG Allowing existing directory
py312: 387 I exit 0 (0.01 seconds) /home/jmusilek/test/tox-uv-fail> .direnv/python-3.12.8/bin/uv venv -p /home/jmusilek/test/tox-uv-fail/.direnv/python-3.12.8/bin/python3 --allow-existing -v --python-preference only-system /home/jmusilek/test/tox-uv-fail/.tox/py312 pid=3517684 [tox/execute/api.py:294]
py312: 388 W venv-query> .tox/py312/bin/python /home/jmusilek/test/tox-uv-fail/.direnv/python-3.12.8/lib/python3.12/site-packages/tox_uv/_venv_query.py [tox/tox_env/api.py:434]
py312: 419 I exit 0 (0.03 seconds) /home/jmusilek/test/tox-uv-fail> .tox/py312/bin/python /home/jmusilek/test/tox-uv-fail/.direnv/python-3.12.8/lib/python3.12/site-packages/tox_uv/_venv_query.py pid=3517691 [tox/execute/api.py:294]
py312: 420 W venv> .direnv/python-3.12.8/bin/uv venv -p /home/jmusilek/test/tox-uv-fail/.direnv/python-3.12.8/bin/python3 --allow-existing -v --python-preference only-system /home/jmusilek/test/tox-uv-fail/.tox/py312 [tox/tox_env/api.py:434]
DEBUG uv 0.6.7
DEBUG Using Python request `/home/jmusilek/test/tox-uv-fail/.direnv/python-3.12.8/bin/python3` from explicit request
DEBUG Checking for Python interpreter at path `.direnv/python-3.12.8/bin/python3`
Using CPython 3.12.8 interpreter at: .direnv/python-3.12.8/bin/python3
Creating virtual environment at: .tox/py312
DEBUG Using base executable for virtual environment: /usr/bin/python3.12
DEBUG Allowing existing directory
py312: 436 I exit 0 (0.01 seconds) /home/jmusilek/test/tox-uv-fail> .direnv/python-3.12.8/bin/uv venv -p /home/jmusilek/test/tox-uv-fail/.direnv/python-3.12.8/bin/python3 --allow-existing -v --python-preference only-system /home/jmusilek/test/tox-uv-fail/.tox/py312 pid=3517696 [tox/execute/api.py:294]
py312: OK ✔ in 0.06 seconds
py313: 442 W venv> .direnv/python-3.12.8/bin/uv venv -p cpython3.13 --allow-existing -v --python-preference only-system /home/jmusilek/test/tox-uv-fail/.tox/py313 [tox/tox_env/api.py:434]
DEBUG uv 0.6.7
DEBUG Using Python request `cpython@3.13` from explicit request
DEBUG Searching for CPython 3.13 in search path
DEBUG Found `cpython-3.12.8-linux-x86_64-gnu` at `/home/jmusilek/test/tox-uv-fail/.direnv/python-3.12.8/bin/python3` (first executable in the search path)
DEBUG Ignoring Python interpreter at `/home/jmusilek/test/tox-uv-fail/.direnv/python-3.12.8/bin/python3`: system interpreter required
DEBUG Found `cpython-3.12.8-linux-x86_64-gnu` at `/home/jmusilek/test/tox-uv-fail/.direnv/python-3.12.8/bin/python` (search path)
DEBUG Ignoring Python interpreter at `/home/jmusilek/test/tox-uv-fail/.direnv/python-3.12.8/bin/python`: system interpreter required
DEBUG Found `cpython-3.12.8-linux-x86_64-gnu` at `/usr/bin/python3` (search path)
DEBUG Skipping interpreter at `/usr/bin/python3` from search path: does not satisfy request `3.13`
DEBUG Found `cpython-3.12.8-linux-x86_64-gnu` at `/bin/python3` (search path)
DEBUG Skipping interpreter at `/bin/python3` from search path: does not satisfy request `3.13`
  × No interpreter found for CPython 3.13 in search path
py313: 455 E internal error [tox/session/cmd/run/single.py:60]
Traceback (most recent call last):
  File "/home/jmusilek/test/tox-uv-fail/.direnv/python-3.12.8/lib/python3.12/site-packages/tox/config/loader/ini/__init__.py", line 77, in replacer
    replaced = replace(conf, reference_replacer, raw_, args_)  # do replacements
               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/jmusilek/test/tox-uv-fail/.direnv/python-3.12.8/lib/python3.12/site-packages/tox/config/loader/replacer.py", line 70, in replace
    return Replacer(conf, reference, conf_args=args, depth=depth).join(find_replace_expr(value))
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/jmusilek/test/tox-uv-fail/.direnv/python-3.12.8/lib/python3.12/site-packages/tox/config/loader/replacer.py", line 199, in join
    return "".join(self(value))
                   ^^^^^^^^^^^
  File "/home/jmusilek/test/tox-uv-fail/.direnv/python-3.12.8/lib/python3.12/site-packages/tox/config/loader/replacer.py", line 196, in __call__
    return [self._replace_match(me) if isinstance(me, MatchExpression) else str(me) for me in value]
            ^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/jmusilek/test/tox-uv-fail/.direnv/python-3.12.8/lib/python3.12/site-packages/tox/config/loader/replacer.py", line 204, in _replace_match
    flattened_args = [self.join(arg) for arg in value.expr]
                      ^^^^^^^^^^^^^^
  File "/home/jmusilek/test/tox-uv-fail/.direnv/python-3.12.8/lib/python3.12/site-packages/tox/config/loader/replacer.py", line 199, in join
    return "".join(self(value))
                   ^^^^^^^^^^^
  File "/home/jmusilek/test/tox-uv-fail/.direnv/python-3.12.8/lib/python3.12/site-packages/tox/config/loader/replacer.py", line 196, in __call__
    return [self._replace_match(me) if isinstance(me, MatchExpression) else str(me) for me in value]
            ^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/jmusilek/test/tox-uv-fail/.direnv/python-3.12.8/lib/python3.12/site-packages/tox/config/loader/replacer.py", line 218, in _replace_match
    replace_value = self.reference(arg_value, conf_args)
                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/jmusilek/test/tox-uv-fail/.direnv/python-3.12.8/lib/python3.12/site-packages/tox/config/loader/ini/replace.py", line 58, in __call__
    raise exception
  File "/home/jmusilek/test/tox-uv-fail/.direnv/python-3.12.8/lib/python3.12/site-packages/tox/config/loader/ini/replace.py", line 42, in __call__
    value = src.load(key, conf_args.chain)
            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/jmusilek/test/tox-uv-fail/.direnv/python-3.12.8/lib/python3.12/site-packages/tox/config/sets.py", line 133, in load
    return config_definition.__call__(self._conf, self.loaders, ConfigLoadArgs(chain, self.name, self.env_name))  # noqa: PLC2801
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/jmusilek/test/tox-uv-fail/.direnv/python-3.12.8/lib/python3.12/site-packages/tox/config/of_type.py", line 60, in __call__
    return self.value() if callable(self.value) else self.value
           ^^^^^^^^^^^^
  File "/home/jmusilek/test/tox-uv-fail/.direnv/python-3.12.8/lib/python3.12/site-packages/tox_uv/_venv.py", line 250, in env_site_package_dir
    py = self._py_info
         ^^^^^^^^^^^^^
  File "/usr/lib/python3.12/functools.py", line 995, in __get__
    val = self.func(instance)
          ^^^^^^^^^^^^^^^^^^^
  File "/home/jmusilek/test/tox-uv-fail/.direnv/python-3.12.8/lib/python3.12/site-packages/tox_uv/_venv.py", line 283, in _py_info
    self.create_python_env()
  File "/home/jmusilek/test/tox-uv-fail/.direnv/python-3.12.8/lib/python3.12/site-packages/tox_uv/_venv.py", line 222, in create_python_env
    raise Skip(msg)
tox.tox_env.errors.Skip: could not find python interpreter with spec(s): cpython3.13

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "/home/jmusilek/test/tox-uv-fail/.direnv/python-3.12.8/lib/python3.12/site-packages/tox/session/cmd/run/single.py", line 47, in _evaluate
    tox_env.setup()
  File "/home/jmusilek/test/tox-uv-fail/.direnv/python-3.12.8/lib/python3.12/site-packages/tox/tox_env/api.py", line 257, in setup
    self._setup_env()
  File "/home/jmusilek/test/tox-uv-fail/.direnv/python-3.12.8/lib/python3.12/site-packages/tox/tox_env/python/runner.py", line 98, in _setup_env
    super()._setup_env()
  File "/home/jmusilek/test/tox-uv-fail/.direnv/python-3.12.8/lib/python3.12/site-packages/tox/tox_env/python/api.py", line 231, in _setup_env
    self.ensure_python_env()
  File "/home/jmusilek/test/tox-uv-fail/.direnv/python-3.12.8/lib/python3.12/site-packages/tox/tox_env/python/api.py", line 238, in ensure_python_env
    self.create_python_env()
  File "/home/jmusilek/test/tox-uv-fail/.direnv/python-3.12.8/lib/python3.12/site-packages/tox_uv/_venv.py", line 213, in create_python_env
    if self.conf["system_site_packages"]:
       ~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/jmusilek/test/tox-uv-fail/.direnv/python-3.12.8/lib/python3.12/site-packages/tox/config/sets.py", line 122, in __getitem__
    return self.load(item)
           ^^^^^^^^^^^^^^^
  File "/home/jmusilek/test/tox-uv-fail/.direnv/python-3.12.8/lib/python3.12/site-packages/tox/config/sets.py", line 133, in load
    return config_definition.__call__(self._conf, self.loaders, ConfigLoadArgs(chain, self.name, self.env_name))  # noqa: PLC2801
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/jmusilek/test/tox-uv-fail/.direnv/python-3.12.8/lib/python3.12/site-packages/tox/config/of_type.py", line 117, in __call__
    value = self.default(conf, args.env_name) if callable(self.default) else self.default
            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/jmusilek/test/tox-uv-fail/.direnv/python-3.12.8/lib/python3.12/site-packages/tox_uv/_venv.py", line 69, in <lambda>
    self.environment_variables.get("VIRTUALENV_SYSTEM_SITE_PACKAGES", "False"),
    ^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/jmusilek/test/tox-uv-fail/.direnv/python-3.12.8/lib/python3.12/site-packages/tox_uv/_venv.py", line 184, in environment_variables
    env = super().environment_variables
          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/jmusilek/test/tox-uv-fail/.direnv/python-3.12.8/lib/python3.12/site-packages/tox/tox_env/runner.py", line 193, in environment_variables
    environment_variables = super().environment_variables
                            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/jmusilek/test/tox-uv-fail/.direnv/python-3.12.8/lib/python3.12/site-packages/tox/tox_env/api.py", line 351, in environment_variables
    result[key] = set_env.load(key)
                  ^^^^^^^^^^^^^^^^^
  File "/home/jmusilek/test/tox-uv-fail/.direnv/python-3.12.8/lib/python3.12/site-packages/tox/config/set_env.py", line 90, in load
    result = self._replacer(raw, args)  # apply any replace options
             ^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/jmusilek/test/tox-uv-fail/.direnv/python-3.12.8/lib/python3.12/site-packages/tox/config/loader/ini/__init__.py", line 83, in replacer
    raise HandledError(msg) from exception
tox.report.HandledError: replace failed in py313.setenv with Skip('could not find python interpreter with spec(s): cpython3.13')
  py39: FAIL code 2 (0.03 seconds)
  py310: OK (0.07 seconds)
  py311: OK (0.07 seconds)
  py312: OK (0.06 seconds)
  py313: FAIL code 2 (0.02 seconds)
  evaluation failed :( (0.32 seconds)
```

</details>

## Minimal example



```ini
[tox]
minversion = 4.18.0
envlist =
    py39
    py310
    py311
    py312
    py313
skip_missing_interpreters = true

[testenv]
setenv =
    MYVAR = {env:MYVAR:{envsitepackagesdir}/something}
uv_python_preference = only-system
command = echo $MYVAR
```

This is enough to reproduce the issue, no python files are actually needed. You have to be missing interpreter for at least one of the Python versions listed in `envlist`.

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tox-uv fails on variable interpolation when interpreter is unavailable #189

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Uh oh!

tox-uv fails on variable interpolation when interpreter is unavailable #189

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