Fix pre commit in container

[charlesroelli]

docker compose run --rm web python -m pre_commit run --all-files does not currently work. Here are the changes needed to get it running properly.

[ulgens]

I'm not sure this is desired. pre-commit hooks don't require any dependency that is handled with the container setup, and I believe the standard/common practice is to keep anything git related on the host env. Can you please give more details about the usecase?

[charlesroelli]

The use case is running the pre-commit checks in a local development environment using Docker, which a few of us tried to do at a recent sprint. Maybe these tweaks belong in a separate build stage, though, if there are cases where they should not be applied.

[ulgens]

which a few of us tried to do at a recent sprint

Sorry, I'm missing why. Hooks can be called separately, but the expected flow to use them is to trigger the hooks during a commit, automated via git. Making a commit in a container requires access to the hosts .git config, which is not easy or feasible to provide.

[charlesroelli]

I don't recall anyone committing from the container. The use case is to check that the hooks succeed independent of committing without having to first commit, go online, push, open this page, let the CI run and open the result. The container happens to be a convenient place to run the hooks since it seems to have the required dependencies, including e.g. git which doesn't work due to the safe directory issue.