How to manually run a git pre-commit hook, without attempting a commit?

Question

I just want to be able to run it to see if code in my working tree passes it, without actually attempting a commit.

Answer 1

Just run the pre-commit script through shell:

bash .git/hooks/pre-commit

Answer 2

There's a Python package for this available here. Per the usage documentation:

If you want to manually run all pre-commit hooks on a repository, run pre-commit run --all-files. To run individual hooks use pre-commit run <hook_id>.

So pre-commit run --all-files is what the OP is after.