failed to read config file None when DEFAULT_CONFIG_FILE is corrupt #3611
Description
Issue
When DEFAULT_CONFIG_FILE is corrupted, tox outputs failed to read config file None.
Environment
Provide at least:
- OS: Linux
Output of pip list of the host Python, where tox is installed
$ pip list Package Version Editable project location ------------- -------------------------------- ------------------------- cachetools 6.2.0 chardet 5.2.0 colorama 0.4.6 distlib 0.4.0 filelock 3.19.1 packaging 25.0 pip 25.2 platformdirs 4.4.0 pluggy 1.6.0 pyproject-api 1.9.1 setuptools 80.9.0 tox 4.30.3.dev0+g5e0784a7f.d20250917 /home/kurt/dev/pr-tox virtualenv 20.34.0 wheel 0.45.1Output of running tox
Output of tox -rvv
$ tox --help ERROR:root:failed to read config file None because File contains no section headers. file: '/home/kurt/.config/tox/config.ini', line: 1 '[tox\n' ROOT: failed to read config file None because File contains no section headers. file: '/home/kurt/.config/tox/config.ini', line: 1 '[tox\n' usage: tox [-h] [--colored {yes,no}] [--stderr-color {BLACK,BLUE,CYAN,GREEN,LIGHTBLACK_EX,LIGHTBLUE_EX,LIGHTCYAN_EX,LIGHTGREEN_EX,LIGHTMAGENTA_EX,LIGHTRED_EX,LIGHTWHITE_EX,LIGHTYELLOW_EX,MAGENTA,RED,RESET,WHITE,YELLOW}] [-v | -q] ...Minimal example
$ echo '[tox' > ~/.config/tox/config.ini