Display notice when copyrighted file is copied or renamed

[KyleFromNVIDIA]

Also proposes requiring Python 3.10, since rapidsai/build-planning#88 is being rolled out.

Fixes #48

[jameslamb]

Thanks for working on this! But I don't think it's working as intended.

I pulled your branch to my checkout of pre-commit-hooks and installed it.

cd ~/repos/pre-commit-hooks
git remote add kyle git@github.com:KyleFromNVIDIA/pre-commit-hooks.git
git fetch kyle copyright-copy-rename-notice
git checkout copyright-copy-rename-notice
pip install --ignore-installed -e .

Then pulled the latest cudf and added this to its .pre-commit-config.yaml

  - repo: local
    hooks:
      - id: verify-copyright-local
        name: verify-copyright-local
        language: system
        entry: verify-copyright

Then ran the following from the root of the cudf repo (the same change that led to #48):

sed -i .bak 's/2023-2024/2024/g' ./python/libcudf/libcudf/_version.py
git add ./python
pre-commit run verify-copyright-local \
  --files ./python/libcudf/libcudf/_version.py

I don't see the new warning text about file changes. I see the exact same output I reported in #48.

verify-copyright-local...................................................Failed
- hook id: verify-copyright-local
- exit code: 1

In file python/libcudf/libcudf/_version.py:1:17:
 # Copyright (c) 2024, NVIDIA CORPORATION.
warning: copyright is not out of date and should not be updated

In file python/libcudf/libcudf/_version.py:1:3:
-# Copyright (c) 2024, NVIDIA CORPORATION.
+# Copyright (c) 2023-2024, NVIDIA CORPORATION.
note: suggested fix

Double-checked that my local hook was set up correctly by adding a raise RuntimeError in my checkout of the pre-commit-hooks code and repeating the steps above. I saw that error raised, so I'm fairly confident that my local testing setup here is using your branch.

Like I mentioned in #48 (comment), I think it'd be fine to just unconditionally include language in this particular warning saying that a copy/rename of a file can be one reason for this result, and that adding arbitrary content to the file is enough to get this hook to use only that file's own edit history for copyright years. That's an option I'd support if determining whether a particular change was a copy/rename and which source file the target file was copied/renamed from is too complex.

[KyleFromNVIDIA]

Then pulled the latest cudf

This is the problem. You've done this after rapidsai/cudf#15483 was already merged, so the hook will no longer think _version.py was copied. Try resetting your branch-24.10 to rapidsai/cudf@91f304e and see if you get the same result.

[KyleFromNVIDIA]

I see the problem. I just tried copying a random file and changing the copyright range. I put the message on "update copyright" but not on "don't update copyright". I'll fix it.

[KyleFromNVIDIA]

Try it again. This time, do the following:

sed 's/2023-2024/2024/g' python/cudf/cudf/_version.py > python/cudf/cudf/_version2.py
git add python/cudf/cudf/_version2.py
pre-commit run -a verify-copyright

And you'll see the note about the file being copied.

[jameslamb]

Ok great, tested as you suggested and I do see the note now.

verify-copyright-local...................................................Failed
- hook id: verify-copyright-local
- exit code: 1

In file python/cudf/cudf/_version2.py:1:17:
 # Copyright (c) 2024, NVIDIA CORPORATION.
warning: copyright is not out of date and should not be updated

In file python/cudf/cudf/_version2.py:1:1:
 # Copyright (c) 2024, NVIDIA CORPORATION.
note: file was copied from '_version.py'

In file python/cudf/cudf/_version2.py:1:3:
-# Copyright (c) 2024, NVIDIA CORPORATION.
+# Copyright (c) 2023-2024, NVIDIA CORPORATION.
note: suggested fix

I do still think, as I suggested in #48 (comment), that it'd be helpful to explicitly say something like the following instead:

note: file was copied from '_version.py', and is assumed to share copyright history with it. Change the content of 'python/cudf/cudf/_version2.py' if you want its copyright dates to only be determined by its own edit history.

If I'd seen that when I initially encountered the behavior that led to #48, I would have immediately known why it was happening and how to resolve it.

But if you really feel strongly about not having that, I'm not going to block the PR until you agree, so marking this approved.