From mboxrd@z Thu Jan  1 00:00:00 1970
From: ludo@gnu.org (Ludovic =?UTF-8?Q?Court=C3=A8s?=)
Subject: bug#20137: number of generation doesn't always rise monotonically
Date: Thu, 19 Mar 2015 09:47:06 +0100
Message-ID: <871tkl8jcl.fsf@gnu.org>
References: <20150318173550.GE525@venom.suse.cz> <87k2yedovp.fsf@gnu.org>
	<87zj7a3udo.fsf@taylan.uni.cx>
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 ([2001:4830:134:3::10]:50850)
	by lists.gnu.org with esmtp (Exim 4.71)
	(envelope-from <Debian-debbugs@debbugs.gnu.org>) id 1YYW7X-0006Qo-1g
	for bug-guix@gnu.org; Thu, 19 Mar 2015 04:48:03 -0400
Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71)
	(envelope-from <Debian-debbugs@debbugs.gnu.org>) id 1YYW7W-000790-8E
	for bug-guix@gnu.org; Thu, 19 Mar 2015 04:48:02 -0400
Received: from debbugs.gnu.org ([140.186.70.43]:53864)
	by eggs.gnu.org with esmtp (Exim 4.71)
	(envelope-from <Debian-debbugs@debbugs.gnu.org>) id 1YYW7W-00078w-4r
	for bug-guix@gnu.org; Thu, 19 Mar 2015 04:48:02 -0400
Received: from Debian-debbugs by debbugs.gnu.org with local (Exim 4.80)
	(envelope-from <Debian-debbugs@debbugs.gnu.org>) id 1YYW7V-00059Q-U2
	for bug-guix@gnu.org; Thu, 19 Mar 2015 04:48:02 -0400
Sender: "Debbugs-submit" <debbugs-submit-bounces@debbugs.gnu.org>
Resent-Message-ID: <handler.20137.B20137.142675483119735@debbugs.gnu.org>
In-Reply-To: <87zj7a3udo.fsf@taylan.uni.cx> ("Taylan Ulrich
	\=\?utf-8\?Q\?\=5C\=22Bay\=C4\=B1rl\=C4\=B1\=2FKammer\=5C\=22\=22's\?\=
	message of "Wed, 18 Mar 2015 21:47:47 +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-bounces+gcggb-bug-guix=m.gmane.org@gnu.org
To: "Taylan Ulrich
	\"=?UTF-8?Q?Bay=C4=B1rl=C4=B1/Kammer?=\"" <taylanbayirli@gmail.com>
Cc: 20137@debbugs.gnu.org

taylanbayirli@gmail.com (Taylan Ulrich "Bay=C4=B1rl=C4=B1/Kammer") skribis:

> ludo@gnu.org (Ludovic Court=C3=A8s) writes:
>
>>   2. Upon rollback from P to N, keep all the generations, but use P+1
>>      for the next generation number.  Doesn=E2=80=99t work, because roll=
ing back
>>      from P+1 would bring you back to P instead of N.
>
> Perhaps we can eventually move to an actual tree structure where the
> nodes can be named whatever.

I agree this would be the right thing for a real undo mechanism.

But how useful would it be?  I=E2=80=99ve never been in a situation where
rollback/switch-generation would be insufficient or inappropriate.

I=E2=80=99m concerned that this would add both code and user interface
complexity for mostly hypothetical use cases.  WDYT?

Thanks,
Ludo=E2=80=99.