From mboxrd@z Thu Jan  1 00:00:00 1970
From: Alex Kost <alezost@gmail.com>
Subject: Re: How to install an old package version?
Date: Fri, 12 Aug 2016 12:18:56 +0300
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In-Reply-To: <f1ae32ab-0662-ba6a-c329-21f4423704fc@goebel-consult.de> (Hartmut
	Goebel's message of "Thu, 11 Aug 2016 21:16:44 +0200")
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To: Hartmut Goebel <h.goebel@goebel-consult.de>
Cc: help-guix@gnu.org

Hartmut Goebel (2016-08-11 22:16 +0300) wrote:

> Hi,
>
> I'm curious about how to install an old package version with guix.
>
> Example for what I mean:
>
> In e.g Debian, the list of available packages is separate from
> apt-get (et al.). So I can query all available versions of a package
> and install the version I need:
>
> =C2=A0$ apt-cache madison nginx
> =C2=A0=C2=A0=C2=A0=C2=A0 nginx | 1.9.10-1~bpo8+3 | http://debian.mirror.l=
rz.de/debian/
> jessie-backports/ma
> =C2=A0=C2=A0=C2=A0=C2=A0 nginx | 1.6.2-5+deb8u2 | http://security.debian.=
org/ jessie/
> updates/main amd64 Pa
>
>
> Now in guix, the list of available packages is build into guix, there
> is no external cache. So how can I e.g. install python-2.7.10 after I
> installed guix 0.11.0, which only defines python-2.7.11?

You have to make your own package for this version, that would look like
this:

(define-public python-2.7.10
  (package
    (inherit python)
    (version "2.7.10")
    (source (origin
              (inherit (package-source python-2.7))
              (uri (string-append "https://www.python.org/ftp/python/"
                                  version "/Python-" version ".tar.xz"))
              (sha256 (base32 "some-letters-and-numbers"))))))

and to put it to a file from GUIX_PACKAGE_PATH.
See (info "(guix) Package Modules") for details.

Alternatively, you can use a guix git checkout on a specific commit that
still has python-2.7.10, but it's probably not what you want.

--=20
Alex