From mboxrd@z Thu Jan  1 00:00:00 1970
From: Ludovic =?UTF-8?Q?Court=C3=A8s?= <ludo@gnu.org>
Subject: bug#33285: Installing, then removing,
	a package yields a different profile
Date: Wed, 06 Feb 2019 14:19:26 +0100
Message-ID: <878sytawbl.fsf@gnu.org>
References: <8736seyb6d.fsf@gmail.com> <87r2fyz3ik.fsf@gnu.org>
	<87woppl5zy.fsf@gmail.com> <87sgx4wjlv.fsf@elephly.net>
	<877eefsa8n.fsf@gnu.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 ([209.51.188.92]:54134)
	by lists.gnu.org with esmtp (Exim 4.71)
	(envelope-from <Debian-debbugs@debbugs.gnu.org>) id 1grN7U-0003Ja-AG
	for bug-guix@gnu.org; Wed, 06 Feb 2019 08:20:06 -0500
Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71)
	(envelope-from <Debian-debbugs@debbugs.gnu.org>) id 1grN7S-0006Ru-JY
	for bug-guix@gnu.org; Wed, 06 Feb 2019 08:20:04 -0500
Received: from debbugs.gnu.org ([209.51.188.43]:34870)
	by eggs.gnu.org with esmtps (TLS1.0:RSA_AES_128_CBC_SHA1:16)
	(Exim 4.71) (envelope-from <Debian-debbugs@debbugs.gnu.org>)
	id 1grN7S-0006Rq-GN
	for bug-guix@gnu.org; Wed, 06 Feb 2019 08:20:02 -0500
Received: from Debian-debbugs by debbugs.gnu.org with local (Exim 4.84_2)
	(envelope-from <Debian-debbugs@debbugs.gnu.org>) id 1grN7S-0002ol-7L
	for bug-guix@gnu.org; Wed, 06 Feb 2019 08:20:02 -0500
Sender: "Debbugs-submit" <debbugs-submit-bounces@debbugs.gnu.org>
Resent-Message-ID: <handler.33285.B33285.154945917210771@debbugs.gnu.org>
In-Reply-To: <877eefsa8n.fsf@gnu.org> ("Ludovic
	\=\?utf-8\?Q\?Court\=C3\=A8s\=22'\?\=
	\=\?utf-8\?Q\?s\?\= message of "Mon, 04 Feb 2019 19:02:16 +0100")
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" <bug-guix-bounces+gcggb-bug-guix=m.gmane.org@gnu.org>
To: Ricardo Wurmus <rekado@elephly.net>
Cc: 33285@debbugs.gnu.org

Ludovic Court=C3=A8s <ludo@gnu.org> skribis:

> Actually, to do things correctly, we should really store the .drv in the
> =E2=80=98manifest=E2=80=99 file.  That way, manifest entries would always=
 contains a
> valid =E2=80=9Clowerable=E2=80=9D object (a package or a derivation recor=
d), as opposed
> to a store reference that happens to be valid.

On second thought that=E2=80=99s probably not a great idea: we=E2=80=99d re=
tain
references to the .drv themselves, which can end up taking a bit of
space, especially if --gc-keep-outputs is in use.

So=E2=80=A6 the more I think about it the more I=E2=80=99m tempted to punt =
on this one.

The discrepancy we see here does not happen when using --manifest, which
is probably what matters most.

Thoughts?

Ludo=E2=80=99.