Is it correct that currently, the ruff tool only checks for linting rules that can be automatically fixed? When I use the default flake8 configuration and run

pants lint ::

, it fails as expected due to several minor issues, but when I enable ruff, it only fails the build when it encounters issues that it can automatically correct (not for example E501).

Hmm that might be correct, and would also be a bug. If you can reproduce please make an issue on GitHub!

I will see if I can isolate the issue in a minimar repository; if I can I will submit a bug report.