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bug#36865: Guix gc breaks grub

From: Xavier Montillet
Subject: bug#36865: Guix gc breaks grub
Date: Wed, 31 Jul 2019 21:05:06 +0000
User-agent: Cyrus-JMAP/3.1.6-799-g925e343-fmstable-20190729v1

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.


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)?


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