when run from gitlab CI, mypy does not use virtual environment

[dpinol]

Hi,
replacing pre-commit with pre-commit-uv on our development machines our "pre-commit run --all mypy" has the same behaviour as with default pre-commit.
However, when running on gitlab CI, it looks like pre-commit is not creating a separate virtualenv with the dependencies on the "additional_dependencies" field, but it's running on the outer environment.

does it make any sense?

thanks

  - repo: https://github.com/pre-commit/mirrors-mypy
    rev: v1.15.0
    hooks:
      - id: mypy
        exclude: (bin)
        additional_dependencies:
          - deepdiff~=8.5.0

[gaborbernat]

Sounds like a pre-commit bug. Did you try if it works with that only?

[anjos]

I'm hitting a similar issue by which the mypy plugin wants to pip install some stubs:

mypy.....................................................................Failed
- hook id: mypy
- exit code: 1

Installing missing stub packages:
/Users/andre/.cache/pre-commit/repo8ncl5o8_/py_env-python3.13/bin/python3 -m pip install types-tabulate

/Users/andre/.cache/pre-commit/repo8ncl5o8_/py_env-python3.13/bin/python3: No module named pip

src/fairical/utils.py:9: error: Library stubs not installed for "tabulate"  [import-untyped]
src/fairical/utils.py:9: note: Hint: "python3 -m pip install types-tabulate"
src/fairical/utils.py:9: note: (or run "mypy --install-types" to install all missing stub packages)
src/fairical/utils.py:9: note: See https://mypy.readthedocs.io/en/stable/running_mypy.html#missing-imports
Found 1 error in 1 file (checked 25 source files)

Do I need to do something special to ensure that python3 -m pip goes through uv as well instead?