From mboxrd@z Thu Jan  1 00:00:00 1970
From: Ricardo Wurmus <rekado@elephly.net>
Subject: Re: Multiple versions
Date: Sun, 27 Dec 2015 16:41:18 +0100
Message-ID: <87r3i75275.fsf@elephly.net>
References: <n5n6as$slp$1@ger.gmane.org> <20151227052600.GA32379@thebird.nl>
	<20151227092027.GA1958@sagulo> <20151227124152.GA1249@thebird.nl>
	<20151227144002.GA23049@sagulo>
Mime-Version: 1.0
Content-Type: text/plain; charset=utf-8
Content-Transfer-Encoding: 8bit
Return-path: <guix-devel-bounces+gcggd-guix-devel=m.gmane.org@gnu.org>
Received: from eggs.gnu.org ([2001:4830:134:3::10]:36841)
	by lists.gnu.org with esmtp (Exim 4.71)
	(envelope-from <rekado@elephly.net>) id 1aDDRp-0003OU-QL
	for guix-devel@gnu.org; Sun, 27 Dec 2015 10:41:30 -0500
Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71)
	(envelope-from <rekado@elephly.net>) id 1aDDRp-0001ei-0D
	for guix-devel@gnu.org; Sun, 27 Dec 2015 10:41:29 -0500
In-reply-to: <20151227144002.GA23049@sagulo>
List-Id: "Development of GNU Guix and the GNU System distribution."
	<guix-devel.gnu.org>
List-Unsubscribe: <https://lists.gnu.org/mailman/options/guix-devel>,
	<mailto:guix-devel-request@gnu.org?subject=unsubscribe>
List-Archive: <http://lists.gnu.org/archive/html/guix-devel>
List-Post: <mailto:guix-devel@gnu.org>
List-Help: <mailto:guix-devel-request@gnu.org?subject=help>
List-Subscribe: <https://lists.gnu.org/mailman/listinfo/guix-devel>,
	<mailto:guix-devel-request@gnu.org?subject=subscribe>
Errors-To: guix-devel-bounces+gcggd-guix-devel=m.gmane.org@gnu.org
Sender: guix-devel-bounces+gcggd-guix-devel=m.gmane.org@gnu.org
To: Dmitry Bogatov <KAction@gnu.org>
Cc: guix-devel@gnu.org


Dmitry Bogatov <KAction@gnu.org> writes:

>> I do the same with Ruby using profiles. I have any number of interpreters
>> installed for testing and any number of libraries using either guix or
>> the lib path with a profile in there.
>
> But how do you solve problem, that for example you want library foo-999.very.new,
> compiled with ruby-1.8, but they never existed at same time in guix
> package tree?

Then you can either look up the recipe for ruby-1.8 in the repository
history and copy it, or you create a fresh variant of the “ruby” package
with something like this:

    (define-public my-particular-ruby
      (package (inherit ruby)
        (version "1.8")
        (source (origin ...) ...)))

Here you adjust the version and the source, and bind this variant to a
name “my-particular-ruby”.

You can either put this expression in the “ruby.scm” module (e.g. in a
local branch), or maintain your own package module.  If you choose the
latter you’d have to tell Guix about it by pointing the environment
variable “GUIX_PACKAGE_PATH” at the path.

~~ Ricardo