Add a "shared cache" subdirectory of .nox and add API for accessing it

[dhermes]

@theacodes And I have discussed this before but I keep forgetting to file an issue.

A few applications:

• Python extensions with long compile times can cache object files and other built resources there (can share object files across different Python versions)
• Store hashes of non-Python source files, so that way the .so/.pyd modules in an editable install can be updated when the source changes

[theacodes]

I'm all for this idea, but we'd need someone to sketch out what the API should look like.

[dhermes]

Would {envdir}/.shared be an appropriate name? Does there exist a check against the virtualenv_dirname for "reserved" names?

[theacodes]

That makes sense to me.

[theacodes]

There's nothing blocking this issue, and it's a great candidate for a contribution. We'd just need to sketch out the API together.

[pradyunsg]

Noting here that pip's use case would benefit from this, since we maintain a common wheels "cache" for our test suite (downloaded setuptools and wheel .whl files, which can be installed during the tests in our various environments).

For now, I'm just dumping them in a local directory that's git-ignored.

[theacodes]

We have some of this in #320, this just makes it higher-level by having a directory that is shared across sessions and persists between Nox runs.

[DiddiLeija]

@theacodes @dhermes How is this issue going? If there's something else to do, I can do it. Just tell me.

[DiddiLeija]

So, can I work on this issue?

[theacodes]

Go for it!

…

On Thu, Sep 9, 2021 at 5:40 PM Diego Ramirez ***@***.***> wrote: So, can I work on this issue? — You are receiving this because you were mentioned. Reply to this email directly, view it on GitHub <#72 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AAB5I4YXRDKW2TYA7KLFTU3UBESTFANCNFSM4EAFMCSQ> . Triage notifications on the go with GitHub Mobile for iOS <https://apps.apple.com/app/apple-store/id1477376905?ct=notification-email&mt=8&pt=524675> or Android <https://play.google.com/store/apps/details?id=com.github.android&referrer=utm_campaign%3Dnotification-email%26utm_medium%3Demail%26utm_source%3Dgithub>.

[DiddiLeija]

Ok. I'll open a PR the next week (I don't feel so good this week 😞).

[theacodes]

Absolutely no pressure, and I hope you feel better soon.

…

On Thu, Sep 9, 2021 at 5:50 PM Diego Ramirez ***@***.***> wrote: Ok. I'll open a PR the next week (I don't feel so good this week 😞). — You are receiving this because you were mentioned. Reply to this email directly, view it on GitHub <#72 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AAB5I434UXOPO6XRRKSIXHLUBET35ANCNFSM4EAFMCSQ> . Triage notifications on the go with GitHub Mobile for iOS <https://apps.apple.com/app/apple-store/id1477376905?ct=notification-email&mt=8&pt=524675> or Android <https://play.google.com/store/apps/details?id=com.github.android&referrer=utm_campaign%3Dnotification-email%26utm_medium%3Demail%26utm_source%3Dgithub>.