From mboxrd@z Thu Jan  1 00:00:00 1970
From: Pjotr Prins <pjotr.public12@thebird.nl>
Subject: Re: Multiple versions
Date: Sun, 27 Dec 2015 13:41:52 +0100
Message-ID: <20151227124152.GA1249@thebird.nl>
References: <n5n6as$slp$1@ger.gmane.org> <20151227052600.GA32379@thebird.nl>
	<20151227092027.GA1958@sagulo>
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Return-path: <guix-devel-bounces+gcggd-guix-devel=m.gmane.org@gnu.org>
Received: from eggs.gnu.org ([2001:4830:134:3::10]:41843)
	by lists.gnu.org with esmtp (Exim 4.71)
	(envelope-from <pjotr2015@thebird.nl>) id 1aDAeE-0005vR-Tl
	for guix-devel@gnu.org; Sun, 27 Dec 2015 07:42:08 -0500
Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71)
	(envelope-from <pjotr2015@thebird.nl>) id 1aDAeE-0001Mv-5D
	for guix-devel@gnu.org; Sun, 27 Dec 2015 07:42:06 -0500
Content-Disposition: inline
In-Reply-To: <20151227092027.GA1958@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

On Sun, Dec 27, 2015 at 12:20:27PM +0300, Dmitry Bogatov wrote:
> Currently, I am at master branch. I want install parallel-20151122.
> But it is gone since 0877e. I propose to keep *all* versions,
> but just 'parallel' refer to latest.

Use a combination of git hash values (to generate the versions) and
guix profiles (to manage them at the same time).

> In case of haskell/python/ruby libraries, I propose keep all versions
> multiplied by every version of compiler/interpreter.

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.

It can all be done, but it is not the job of guix to to manage beyond
profiles. I do think we should have transparent git HASH tagged
installs, e.g., 

guix package -i ruby --git-hash HASH

which would checkout a git tree and run something like ./pre-inst-env
under the hood.  What we do by hand now can be done automatically. But
that is a wider subject.

With regard to your emacs question, better post it with a separate
subject title. It got lost now.

Pj.