From mboxrd@z Thu Jan  1 00:00:00 1970
From: ludo@gnu.org (Ludovic =?utf-8?Q?Court=C3=A8s?=)
Subject: Re: guix-package --roll-back
Date: Sat, 05 Jan 2013 20:20:46 +0100
Message-ID: <87vcbbqvw1.fsf@gnu.org>
References: <871uejyq9z.fsf@karetnikov.org> <874nj4sbfe.fsf@karetnikov.org>
	<87y5gf8sm1.fsf@gnu.org> <87hamy4yaj.fsf@karetnikov.org>
	<87pq1m5nxy.fsf@gnu.org> <87obh43j7r.fsf@karetnikov.org>
Mime-Version: 1.0
Content-Type: text/plain; charset=utf-8
Content-Transfer-Encoding: quoted-printable
Return-path: <bug-guix-bounces+gcggb-bug-guix=m.gmane.org@gnu.org>
Received: from eggs.gnu.org ([208.118.235.92]:36837)
	by lists.gnu.org with esmtp (Exim 4.71)
	(envelope-from <ludo@gnu.org>) id 1TrZIY-0005c7-RW
	for bug-guix@gnu.org; Sat, 05 Jan 2013 14:20:52 -0500
Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71)
	(envelope-from <ludo@gnu.org>) id 1TrZIX-0001Mz-MU
	for bug-guix@gnu.org; Sat, 05 Jan 2013 14:20:50 -0500
Received: from mail4-relais-sop.national.inria.fr ([192.134.164.105]:22021)
	by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from <ludo@gnu.org>)
	id 1TrZIX-0001Mv-Fs
	for bug-guix@gnu.org; Sat, 05 Jan 2013 14:20:49 -0500
In-Reply-To: <87obh43j7r.fsf@karetnikov.org> (Nikita Karetnikov's message of
	"Fri, 04 Jan 2013 13:18:43 -0500")
List-Id: Bug reports for GNU Guix <bug-guix.gnu.org>
List-Unsubscribe: <https://lists.gnu.org/mailman/options/bug-guix>,
	<mailto:bug-guix-request@gnu.org?subject=unsubscribe>
List-Archive: <http://lists.gnu.org/archive/html/bug-guix>
List-Post: <mailto:bug-guix@gnu.org>
List-Help: <mailto:bug-guix-request@gnu.org?subject=help>
List-Subscribe: <https://lists.gnu.org/mailman/listinfo/bug-guix>,
	<mailto:bug-guix-request@gnu.org?subject=subscribe>
Errors-To: bug-guix-bounces+gcggb-bug-guix=m.gmane.org@gnu.org
Sender: bug-guix-bounces+gcggb-bug-guix=m.gmane.org@gnu.org
To: Nikita Karetnikov <nikita@karetnikov.org>
Cc: bug-guix@gnu.org

Hi,

Nikita Karetnikov <nikita@karetnikov.org> skribis:

> It depends on how profiles are stored. It turned out that there are
> several issues. By the way, what should I do to create a custom profile?

The only way to manipulate profiles is via =E2=80=98guix-package -p xxx=E2=
=80=99.

> Both 'profile-rx' and 'profile-number' work fine when '%current-profile'
> is used.
>
> scheme@(guile-user)> (define %current-profile "/nix/var/nix/profiles/per-=
user/root/guix-profile")
> scheme@(guile-user)> (profile-number %current-profile)
> $2 =3D "1"
> scheme@(guile-user)> (readlink %current-profile)
> $3 =3D "/nix/var/nix/profiles/per-user/root/guix-profile-1-link"
>
> But fail for other inputs.

That=E2=80=99s expected.

> Here is what I used to create a bogus custom profile.
>
> # cd /home
> # mkdir testdir
> # cd testdir
> # touch env-42
> # ln -s env-42 42-custom-profile
> # ln -s 42-custom-profile guix-profile
>
> [...]
>
> scheme@(guile-user)> (define custom-profile "/home/testdir/guix-profile")
> scheme@(guile-user)> (profile-number custom-profile)
> $7 =3D #f

Yeah, that=E2=80=99s expected.  Basically, if you do

  guix-package -p /dev/null --roll-back

it should fail with an error message saying that there is no previous
profile or something like that.

> So, what kinds of profiles should be supported? Maybe it's not possible
> to create something like 'custom-profile' and there is no need to
> bother.

There are two ways to use =E2=80=98guix-package=E2=80=99:

  1. without -p, it uses the user=E2=80=99s default profile, by default
     /nix/var/nix/profiles/per-user/$USER/guix-profile;

  2. with -p, it uses the specified profile (see tests/guix-package.sh,
     for an example).

Thanks,
Ludo=E2=80=99.