Exclude .venv from backups when it's not in a cache directory

[probablykasper]

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• I have searched the documentation and believe that my question is not covered.

Feature Request

By default .venv folders are in ~/Library/Caches, but they can also be stored in project folders using the virtualenvs.in-project config option. When this happens, cache is being stored in a non-standard location, so it makes sense to let backup solutions know that it should be excluded from backups.

Rust's package manager already does this, and Node.js' package manager is planning to add it. My PR #4599 implements this for Poetry, but there are some mixed opinions so I'm opening this issue for it.

[reitzig]

I agree with this, although I don't know if there's a truly effective, cross-plattform solution for this.

I'll note that cachedir stands as a proposal, and at the very least a marker-file approach is supported by all backup software I've encountered (and even plain tar).

[probablykasper]

cachedir / CACHEDIR.TAG seems to be the best you can get. Rust supports this as well

[finswimmer]

Resolved by #4599

[reitzig]

@finswimmer How is this solved by that PR for any platform that's not MacOS?

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