pypi URL change

[Ben Woodcroft]

Hi,

Today I tried using pypi-url to autogenerate a package that was only released today. Unfortunately, it seems that the URL scheme has changed and I was unable to download, though I believe this only affects newly released package versions. I found this on the nix mailing list:
http://comments.gmane.org/gmane.linux.distributions.nixos/20158

>    So, previously PyPI used URLs like :
>        /packages/{python version}/{name[0]}/{name}/{filename}
>
>    Now it uses:
>        /packages/{hash[:2]}/{hash[2:4]}/{hash[4:]}/{filename}
>    Where hash is blake2b(file_content, digest_size=32).hexdigest().lower()

Is there a blake2b implemented in Guile? In the meantime, the URL will have to be specified manually: 'guix import pypi ...' provides the correct and updated URL.

ben