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--print-extras-to does not work with tox 4.44.0 #90
Description
After upgrade of tox from 4.38.0 to 4.44.0 the --print-extras-to option started to fail:
$ wget https://files.pythonhosted.org/packages/source/f/fixtures/fixtures-4.2.8.tar.gz
$ gtar xf fixtures-4.2.8.tar.gz
$ cd fixtures-4.2.8
$ tox --version
4.44.0 from /usr/lib/python3.14/vendor-packages/tox/__init__.py
registered plugins:
tox-current-env-0.0.16 at /usr/lib/python3.14/vendor-packages/tox_current_env/hooks.py
$ tox --no-provision --print-extras-to=- -e py314
Traceback (most recent call last):
File "/usr/bin/tox-3.14", line 8, in <module>
sys.exit(run())
~~~^^
File "/usr/lib/python3.14/vendor-packages/tox/run.py", line 23, in run
result = main(sys.argv[1:] if args is None else args)
File "/usr/lib/python3.14/vendor-packages/tox/run.py", line 49, in main
return handler(state)
File "/usr/lib/python3.14/vendor-packages/tox/session/cmd/legacy.py", line 115, in legacy
return run_sequential(state)
File "/usr/lib/python3.14/vendor-packages/tox/session/cmd/run/sequential.py", line 25, in run_sequential
return execute(state, max_workers=1, has_spinner=False, live=True)
File "/usr/lib/python3.14/vendor-packages/tox/session/cmd/run/common.py", line 216, in execute
state.envs.ensure_only_run_env_is_active()
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^
File "/usr/lib/python3.14/vendor-packages/tox/session/env_select.py", line 560, in ensure_only_run_env_is_active
envs, active = self._defined_envs, self._env_name_to_active()
^^^^^^^^^^^^^^^^^^
File "/usr/lib/python3.14/vendor-packages/tox/session/env_select.py", line 344, in _defined_envs
run_env = self._build_run_env(name)
File "/usr/lib/python3.14/vendor-packages/tox/session/env_select.py", line 434, in _build_run_env
run_env.register_config()
~~~~~~~~~~~~~~~~~~~~~~~^^
File "/usr/lib/python3.14/vendor-packages/tox/tox_env/python/runner.py", line 57, in register_config
self.conf.add_config(
~~~~~~~~~~~~~~~~~~~~^
keys=["extras"],
^^^^^^^^^^^^^^^^
...<3 lines>...
post_process=_normalize_extras,
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
)
^
File "/usr/lib/python3.14/vendor-packages/tox/config/sets.py", line 101, in add_config
result = self._add_conf(keys_, definition)
File "/usr/lib/python3.14/vendor-packages/tox/config/sets.py", line 129, in _add_conf
self._on_duplicate_conf(key, definition)
~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^
File "/usr/lib/python3.14/vendor-packages/tox/config/sets.py", line 140, in _on_duplicate_conf
raise ValueError(msg)
ValueError: duplicate configuration definition for py314:
has: ConfigDynamicDefinition(keys=['extras'], desc=extras to install of the target package, of_type=typing.Set[str], default=set())
new: ConfigDynamicDefinition(keys=['extras'], desc=extras to install of the target package, of_type=set[str], default=set())
$
With tox 4.38.0 everything works as expected:
$ tox --version
4.38.0 from /usr/lib/python3.14/vendor-packages/tox/__init__.py
registered plugins:
tox-current-env-0.0.16 at /usr/lib/python3.14/vendor-packages/tox_current_env/hooks.py
$ tox --no-provision --print-extras-to=- -e py314
test
docs
py314: OK (0.04 seconds)
congratulations :) (0.14 seconds)
$
Activity
[-]`--print-extras-to=-` does not work with tox 4.44.0[/-][+]`--print-extras-to` does not work with tox 4.44.0[/+]hroncok commentedon Feb 23, 2026
I guess this is coming from
https://github.com/fedora-python/tox-current-env/blob/d4ed1c673f2143656d8848ba4dd3f05d371a1560/src/tox_current_env/hooks4.py#L247-257
Perhaps the
if "extras" not in self.conf:guard is no longer working? Or perhaps tox defines this after us? Nevertheless, worst case scenarion, we can guard this with our own tox-version-based if.Is it possible this was now broken by the
typing.Set[str]->set[str]difference in upstream and it only workjed before because the definitions were identical? Will check later when this was changed upstream.hroncok commentedon Feb 23, 2026
tox-dev/tox@7b601a7 landed in 4.44.0
And it calls
add_configfor the extras not sure why that was added here, but I guess we should not be doing that anymore.hroncok commentedon May 5, 2026
Sorry, it took me longer to get to this than expected. #91