Conda recipe does not work on (my?) Apple M2

[hannesbecher]

Hi there,

I am trying to set up a package that uses pysim and thus kastore. The package (shadie) setup is via anaconda: conda create -n shadie pandas numpy toyplot toytree altair msprime pyslim tskit loguru IPython -c conda-forge

This fails on my M2 Mac because kastore is "not available".

Could not solve for environment specs
The following package could not be installed
└─ pyslim is not installable because it requires
   └─ kastore, which does not exist (perhaps a missing channel).

According to the kastore docs, anaconda should work https://kastore.readthedocs.io/en/stable/installation.html. But it doesn't for me:

$ conda install kastore -c conda-forge
Channels:
 - conda-forge
 - defaults
Platform: osx-arm64
Collecting package metadata (repodata.json): done
Solving environment: failed

PackagesNotFoundError: The following packages are not available from current channels:

  - kastore

However, this finishes successfully on my linux machine. Not sure if the reason is the different CPU architecture?

I know I can set up kastore with pip instead and this seems to work without complaints. It is just a little painful to start setting up the conda env without pyslim, then install kastore and pyslim with pip.

Cheers,
Hannes

[jeromekelleher]

This is a combination of two things:

1. This Python package includes some C code pretty needlessly (it's really only there to test the C, the Python implementation is perfectly fine)
2. Our packaging on conda-forge doesn't include support for Apple ARM.

It would probably be best to just refactor the Python package here to make the C code optional, but this would end up being quite a bit of work. The simplest thing in the short term is probably to update the package at https://github.com/conda-forge/kastore-feedstock to add support for Apple.

I'm surprised that pyslim still needs kastore though - is it still looking at the kastore files @petrelharp?