From mboxrd@z Thu Jan  1 00:00:00 1970
From: csanchezdll@gmail.com (Carlos =?utf-8?Q?S=C3=A1nchez?= de La Lama)
Subject: Re: User-profile search paths should include system-profile
	directories
Date: Mon, 26 Sep 2016 13:19:45 +0200
Message-ID: <7tbmza7vse.fsf@gmail.com>
References: <7tpoo7kk73.fsf@gmail.com> <87eg4mo7dp.fsf@gnu.org>
	<7th99b9g0k.fsf@gmail.com> <87bmziabse.fsf@gmail.com>
	<7td1jyab63.fsf@gmail.com> <877fa5jn0y.fsf@gnu.org>
	<7tvaxoz23z.fsf@gmail.com> <878tuiuhr2.fsf@gnu.org>
Mime-Version: 1.0
Content-Type: text/plain; charset=utf-8
Content-Transfer-Encoding: quoted-printable
Return-path: <guix-devel-bounces+gcggd-guix-devel=m.gmane.org@gnu.org>
Received: from eggs.gnu.org ([2001:4830:134:3::10]:39863)
	by lists.gnu.org with esmtp (Exim 4.71)
	(envelope-from <csanchezdll@gmail.com>) id 1boTxr-0006rr-Fy
	for guix-devel@gnu.org; Mon, 26 Sep 2016 07:20:52 -0400
Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71)
	(envelope-from <csanchezdll@gmail.com>) id 1boTxn-0002qt-NX
	for guix-devel@gnu.org; Mon, 26 Sep 2016 07:20:50 -0400
In-Reply-To: <878tuiuhr2.fsf@gnu.org> ("Ludovic
	\=\?utf-8\?Q\?Court\=C3\=A8s\=22'\?\=
	\=\?utf-8\?Q\?s\?\= message of "Sat, 24 Sep 2016 04:57:37 +0200")
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" <guix-devel-bounces+gcggd-guix-devel=m.gmane.org@gnu.org>
To: Ludovic =?utf-8?Q?Court=C3=A8s?= <ludo@gnu.org>
Cc: guix-devel@gnu.org, Alex Kost <alezost@gmail.com>

Hi Ludo,

>> Making this work would need two things:
>> 1) not stripping unexisting directories from search paths
>> 2) constructing environment variables prepending every profile root to
>>    the search paths of each profile.
>>
>> Now, my question is, why are unexisting search paths removed?
>
> I don=E2=80=99t think this is really the problem here.  The problem here =
is that
> if a profile contains only, say, guile-json, there is no way Guix can
> know about GUILE_LOAD_PATH because that variable is associated with
> Guile itself, not with guile-json.

The idea is each profile environment unconditionally adds search paths
for all the profiles in use (which are passed when evaluating
<profile>/etc/profile in the GUIX_PROFILES variable). This was the
proposal in my first message (looks *similar* to an earlier post in the
bug discussion, but it is quite different).

In the case you suggest, the profile cointaining guile will define
GUILE_LOAD_PATH to point inside its own profile and *also* inside the
profile containing guile-json.

The profile that has guile-json will do nothing, as its installer
packages have no search paths.

This is the key:

export ACLOCAL_PATH=3D"${profiles//:/\/share/aclocal:}/share/aclocal

So ACLOCAL_PATH will have an entry for <each profile>/share/aclocal,
regardless of that path existing or not. If path is not there, no harm
done. If it is (i.e. that profile has a package installing an aclocal
.m4 file) then aclocal will find it.

I will try to prepare a patch, so we can see (and might be there is some
problem I still fail to see).

BR

Carlos