From mboxrd@z Thu Jan  1 00:00:00 1970
From: Eric Bavier <ericbavier@openmailbox.org>
Subject: Re: [PATCH] Add pyusb.
Date: Tue, 29 Mar 2016 21:27:48 -0500
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To: Ricardo Wurmus <rekado@elephly.net>
Cc: guix-devel <guix-devel@gnu.org>

On Tue, 29 Mar 2016 09:07:44 +0200
Ricardo Wurmus <rekado@elephly.net> wrote:

> From a5a632c0f11d650a8e3bcae64ea8680aa90d3cf6 Mon Sep 17 00:00:00 2001
> From: Ricardo Wurmus <rekado@elephly.net>
> Date: Tue, 29 Mar 2016 09:06:09 +0200
> Subject: [PATCH] gnu: Add python-pyusb.
> 
> * gnu/packages/libusb.scm (python-pyusb, python2-pyusb): New variables.
> ---
>  gnu/packages/libusb.scm | 40 +++++++++++++++++++++++++++++++++++++++-
>  1 file changed, 39 insertions(+), 1 deletion(-)
> 
[...]
> @@ -87,6 +89,42 @@ devices on various operating systems.")
>  version of libusb to run with newer libusb.")
>      (license lgpl2.1+)))
>  
> +(define-public python-pyusb
> +  (package
> +    (name "python-pyusb")
> +    (version "1.0.0rc1")
> +    (source
> +     (origin
> +       (method url-fetch)
> +       (uri (pypi-uri "pyusb" version))
> +       (sha256
> +        (base32
> +         "07cjq11qhngzjd746k7688s6y2x7lpj669fxqfsiy985rg0jsn7j"))))
> +    (build-system python-build-system)
> +    (arguments
> +     `(#:tests? #f  ;no tests
> +       #:phases
> +       (modify-phases %standard-phases
> +         (add-after 'unpack 'fix-libusb-reference
> +           (lambda* (#:key inputs #:allow-other-keys)
> +             (substitute* "usb/libloader.py"
> +               (("lib = locate_library\\(candidates, find_library\\)")
> +                (string-append "lib = \""
> +                               (assoc-ref inputs "libusb")
> +                               "/lib/libusb-1.0.so.0.1.0"

Is there any way to derive the soversion to help avoid breakage from
future libusb updates?

`~Eric