pyodide venv should take an abi version / index argument

[hoodmane]

We can see if we can imitate a subset of virtualenv's arguments. I'm not even sure how pyodide venv decides which index to download from since we stopped versioning pyodide-build and the pyodide runtime + recipe set together.

[ryanking13]

Maybe we can use the Pyodide Anaconda Index. It still does not support CORS headers but pyodide venv does not have CORS constraints (as far as I know?), and it use pip-resolver to download packages.

[hoodmane]

Isn't that somewhat orthogonal to being able to select the abi?

[ryanking13]

Isn't that somewhat orthogonal to being able to select the abi?

We can put packages with different ABI (pyodide_2024_0 / pyodide_2025_0) in this index together. pip will select the packages with matching ABI.

[hoodmane]

Ah interesting. But what about if they want the package set specifically from 0.26.4? Maybe nobody wants that?

[ryanking13]

Ah interesting. But what about if they want the package set specifically from 0.26.4? Maybe nobody wants that?

Hmm, good point. If someone wants to test against a specific set of packages in a particular version of Pyodide, one might want to do that. In that case, probably we'll need to use our CDN as an index just like we do now.