GNU bug report logs - #36865
GRUB (or 'grub.cfg') is not registered as a GC root

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From: "Xavier Montillet" <xavierm02 <at> xavierm02.fr>
To: "Ricardo Wurmus" <rekado <at> elephly.net>
Cc: 36865 <at> debbugs.gnu.org
Subject: bug#36865: Guix gc breaks grub
Date: Wed, 31 Jul 2019 21:25:11 +0000

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I just tried running guix gc and restarting and can confirm that the symptoms disappeared.

On Wed, Jul 31, 2019, at 9:05 PM, Xavier Montillet wrote:
> Hi Rocardo,
> 
> I guix pull'ed and grub is no longer marked as dead. "guix gc --list-dead | grep 0fijjh7qw8ppsks0ba3q9m873ljhj797" now returns nothing, while "grep unicode /boot/grub/grub.cfg" till returns the same thing.
> 
> So I guess this means it's fixed?
> 
> I installed with the 1.0.1 installer I think, nothing out of the ordinary, except maybe everything being encrypted, including the /boot.
> 
> Xavier
> 
> On Wed, Jul 31, 2019, at 9:21 AM, Ricardo Wurmus wrote:
>> 
>> Hi Xavier,
>> 
>> > guix gc thinks that grub (and a lot of other stuff that it shouldn't
>> > think is dead) is dead, as shown by the following commands (given by
>> > nckx):
>> >
>> >
>> > $ grep unicode /boot/grub/grub.cfg
>> > search --file --set /gnu/store/0fijjh7qw8ppsks0ba3q9m873ljhj797-grub-2.04/share/grub/unicode.pf2
>> > if loadfont /gnu/store/0fijjh7qw8ppsks0ba3q9m873ljhj797-grub-2.04/share/grub/unicode.pf2; then
>> >
>> > $ guix gc --list-dead | grep 0fijjh7qw8ppsks0ba3q9m873ljhj797
>> > finding garbage collector roots...
>> > determining live/dead paths...
>> > /gnu/store/0fijjh7qw8ppsks0ba3q9m873ljhj797-grub-2.04
>> >
>> > I was also able to reproduce the bug by running guix gc and rebooting again.
>> 
>> Oh, that’s not good. Can you still reproduce this after running “guix
>> system reconfigure …”? It should create a new system generation,
>> register a GC root, and update GRUB.
>> 
>> It should not say that GRUB itself is dead and thus not free it up for
>> garbage collection.
>> 
>> Could you perhaps share something about how you installed the system (if
>> it’s anything out of the ordinary)?
>> 
>> --
>> Ricardo
>> 
>> 
> 

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