GNU bug report logs - #25100
'guix system reconfigure' fails when new generation already exists

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From: help-debbugs <at> gnu.org (GNU bug Tracking System)
To: Chris Marusich <cmmarusich <at> gmail.com>
Subject: bug#25100: closed (Re: bug#25100: 'guix system reconfigure' fails
 when new generation already exists)
Date: Mon, 05 Dec 2016 20:36:02 +0000

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Your bug report

#25100: 'guix system reconfigure' fails when new generation already exists

which was filed against the guix package, has been closed.

The explanation is attached below, along with your original report.
If you require more details, please reply to 25100 <at> debbugs.gnu.org.

-- 
25100: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=25100
GNU Bug Tracking System
Contact help-debbugs <at> gnu.org with problems

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From: ludo <at> gnu.org (Ludovic Courtès)
To: Chris Marusich <cmmarusich <at> gmail.com>
Cc: 25100-done <at> debbugs.gnu.org
Subject: Re: bug#25100: 'guix system reconfigure' fails when new generation
 already exists
Date: Mon, 05 Dec 2016 21:35:40 +0100

Hi!

Chris Marusich <cmmarusich <at> gmail.com> skribis:

> I've noticed that, in GuixSD, if one rolls back the system with 'guix
> system roll-back' or switches to a previous generation with 'guix system
> switch-generation', and then one tries to run 'guix system reconfigure',
> the operation fails because the symlink for the new generation already
> exists.  I expected the operation to succeed and overwrite the existing
> generation, since that mirrors the behavior of 'guix package'.
>
> Specifically, if the current generation is N and generation N+1 exists,
> then running 'guix system reconfigure' should overwrite generation N+1
> with the new system.  Currently, it fails to create the symlink.  I've
> attached a patch which modifies the behavior to be what I expected.

Indeed.

> From 526f78a38dabeb12196a21cebe174f073c217c12 Mon Sep 17 00:00:00 2001
> From: Chris Marusich <cmmarusich <at> gmail.com>
> Date: Fri, 2 Dec 2016 01:52:04 -0800
> Subject: [PATCH] system: If the new system generation already exists,
>  overwrite it.
>
> * guix/scripts/system.scm (switch-to-system): Create the symlink to the new
>   system generation using the procedure "switch-symlink" instead of "symlink".
>   That way, if the link already exists, we update it instead of failing.
>
> * doc/guix.texi (Using the Configuration System, Invoking guix system):
>   Document the behavior.

[...]

> +overwritten.  This behavior mirrors that of @command{guix package}
> +@pxref{Invoking guix package}.

Note: @pxref is for parenthetical expressions (info "(texinfo) pxref").

I adjusted this and the commit log and committed.

Thank you!

Ludo’.

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From: Chris Marusich <cmmarusich <at> gmail.com>
To: bug-guix <at> gnu.org
Subject: 'guix system reconfigure' fails when new generation already exists
Date: Sat, 03 Dec 2016 02:24:50 -0800

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Hi,

I've noticed that, in GuixSD, if one rolls back the system with 'guix
system roll-back' or switches to a previous generation with 'guix system
switch-generation', and then one tries to run 'guix system reconfigure',
the operation fails because the symlink for the new generation already
exists.  I expected the operation to succeed and overwrite the existing
generation, since that mirrors the behavior of 'guix package'.

Specifically, if the current generation is N and generation N+1 exists,
then running 'guix system reconfigure' should overwrite generation N+1
with the new system.  Currently, it fails to create the symlink.  I've
attached a patch which modifies the behavior to be what I expected.

-- 
Chris

[0001-system-If-the-new-system-generation-already-exists-o.patch (text/x-patch, attachment)]

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