Tox crashes with FORCE_COLOR is some arbitrary string #3579
Description
Issue
Tox expects FORCE_COLOR to specific be one of yes, true or 0 in order to be enabled.
From https://force-color.org/:
When this variable is present and not an empty string (regardless of its value), it should force the addition of ANSI color.
Environment
Tox 4.27.0
Output of running tox
With FORCE_COLOR=not an empty string:
Traceback (most recent call last): File "/usr/bin/tox", line 8, in <module> sys.exit(run()) ^^^^^ File "/usr/lib/python3.12/site-packages/tox/run.py", line 19, in run result = main(sys.argv[1:] if args is None else args) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/usr/lib/python3.12/site-packages/tox/run.py", line 38, in main state = setup_state(args) ^^^^^^^^^^^^^^^^^ File "/usr/lib/python3.12/site-packages/tox/run.py", line 52, in setup_state options = get_options(*args) ^^^^^^^^^^^^^^^^^^ File "/usr/lib/python3.12/site-packages/tox/config/cli/parse.py", line 36, in get_options guess_verbosity, log_handler, source = _get_base(args) ^^^^^^^^^^^^^^^ File "/usr/lib/python3.12/site-packages/tox/config/cli/parse.py", line 45, in _get_base tox_parser = ToxParser.base() ^^^^^^^^^^^^^^^^ File "/usr/lib/python3.12/site-packages/tox/config/cli/parser.py", line 223, in base return cls(add_help=False, root=True) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/usr/lib/python3.12/site-packages/tox/config/cli/parser.py", line 146, in __init__ self._add_base_options() File "/usr/lib/python3.12/site-packages/tox/config/cli/parser.py", line 237, in _add_base_options add_core_arguments(self) File "/usr/lib/python3.12/site-packages/tox/config/cli/parser.py", line 317, in add_core_arguments add_color_flags(parser) File "/usr/lib/python3.12/site-packages/tox/config/cli/parser.py", line 290, in add_color_flags elif converter.to_bool(os.environ.get("FORCE_COLOR", "")): ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/usr/lib/python3.12/site-packages/tox/config/loader/str_convert.py", line 130, in to_bool raise TypeError(msg) TypeError: value 'not an empty string' cannot be transformed to bool, valid: , 0, 1, false, no, off, on, true, yes Additional notes
Tox should merely check whether the variable is set, and not expect a family or specifically chosen strings.