From mboxrd@z Thu Jan  1 00:00:00 1970
From: taylanbayirli@gmail.com (Taylan Ulrich =?utf-8?Q?Bay=C4=B1rl=C4=B1?=
	=?utf-8?Q?=2FKammer?=)
Subject: Outdated config.scm in development repo
Date: Tue, 13 Oct 2015 20:08:39 +0200
Message-ID: <871tcy63q0.fsf@T420.taylan>
Mime-Version: 1.0
Content-Type: text/plain
Return-path: <guix-devel-bounces+gcggd-guix-devel=m.gmane.org@gnu.org>
Received: from eggs.gnu.org ([2001:4830:134:3::10]:48394)
	by lists.gnu.org with esmtp (Exim 4.71)
	(envelope-from <taylanbayirli@gmail.com>) id 1Zm40E-0006k9-2G
	for guix-devel@gnu.org; Tue, 13 Oct 2015 14:08:46 -0400
Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71)
	(envelope-from <taylanbayirli@gmail.com>) id 1Zm40A-000401-17
	for guix-devel@gnu.org; Tue, 13 Oct 2015 14:08:46 -0400
Received: from mail-wi0-x22f.google.com ([2a00:1450:400c:c05::22f]:37861)
	by eggs.gnu.org with esmtp (Exim 4.71)
	(envelope-from <taylanbayirli@gmail.com>) id 1Zm409-0003zT-R4
	for guix-devel@gnu.org; Tue, 13 Oct 2015 14:08:41 -0400
Received: by wijq8 with SMTP id q8so44082738wij.0
	for <guix-devel@gnu.org>; Tue, 13 Oct 2015 11:08:41 -0700 (PDT)
Received: from T420.taylan ([2a02:908:c32:4740:221:ccff:fe66:68f0])
	by smtp.gmail.com with ESMTPSA id h7sm5090706wjz.7.2015.10.13.11.08.39
	for <guix-devel@gnu.org>
	(version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128);
	Tue, 13 Oct 2015 11:08:40 -0700 (PDT)
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: guix-devel@gnu.org

>From what I can tell this situation I landed in doesn't involve any bugs
and won't happen to a normal user, but for the sake of documenting it
for developers, here goes:

I have $XDG_CONFIG_HOME/guix/latest point to a git repository so I can
update it swiftly.

In the repo, a ./guix/config.scm is generated from ./guix/config.scm.in
sometimes, I guess on ./configure; I haven't tried to figure out exactly
when but certainly not every time I run 'make'.

That config.scm will contain absolute paths to gzip, bzip2, and some
other things.  If you used a Guix environment to build, those will be
/gnu/store/... paths.

When you update things and garbage-collect, those store items might get
removed, since $XDG_CONFIG_HOME/guix/latest/guix/config.scm is not a GC
root (rightly so, as far as I understand).  And thus, guix commands will
start failing, saying they can't find /gnu/store/.../bin/bzip2 or
whatever.

That sums up the problem description.

Fixing it might be tricky if you need to use 'guix environment' to run
./configure or whatever to fix the config.scm, since you possibly first
need to fix the issue to be able to use 'guix environment' (it will work
only if no calls are made to the missing /gnu/store/... executables).

Manually fixing the config.scm is easy, fortunately.  Just change the
absolute /gnu/store/... paths which point at non-existing store items to
point to existing store items.

Taylan