BackendUnavailable when specifying backend-path · Issue #6599 · pypa/pip (original) (raw)

The functionality was added to pep517 in pypa/pyproject-hooks#46, but hasn't yet been added to pip. I don't think there's been a release of pep517 with this change in it yet, which we'd need if we were to vendor it in pip.

I'm not going to have any time to look at this in the near future, so if someone else wants to do the pip end of things, that would be great (I don't think it'll be hard, the heavy lifting was done in pep517 - the tests will likely be harder to write than the code :-))