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From: ludo@gnu.org (Ludovic =?utf-8?Q?Court=C3=A8s?=)
Subject: Re: pypi URL change
Date: Wed, 27 Apr 2016 14:25:38 +0200
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To: Ben Woodcroft <donttrustben@gmail.com>
Cc: guix-devel@gnu.org

Ben Woodcroft <donttrustben@gmail.com> skribis:

> Hmm. It just dawned on me that it is impossible to implement the
> pypi-uri so that it returns the new format because the new URI is
> generated from the content of the package, not just the name and
> version.

Oh indeed.

> So I think we must either write the hash or the entire URL into the
> package, or grab the json from pypi each time we download.

The former, I guess.

I guess the hash is SHA1, right?

Maybe we could make something like:

  (define-syntax-rule (pypi-origin package sha1 sha256-string)
    (origin
      (method url-fetch)
      (uri (string-append =E2=80=A6 sha1 =E2=80=A6))
      (sha256 (base32 sha256-string))))

and then use it like:

  (package
    (name "python-foo")
    (source (pypi-origin "foo" "cabba9e" "somelongstring")))

?

Ludo=E2=80=99.