bug#29662: 'guix gc' as user makes system unbootable

[Martin Castillo]

Hi,

On 18.12.2017 15:31, Ludovic Courtès wrote:
> Under what circumstances did you have a system without
> /var/guix/gcroots/bootcfg?
> 

I cannot tell. I had some fs errors and run e2fsck several times. Maybe
that removed the link? But since then, I had done several reconfigures.
I'd expect those to recreate it again.

>> # guix system switch-generation 14
>> substitute: updating list of substitutes from
>> 'https://berlin.guixsd.org'... 100.0%
>> substitute: updating list of substitutes from
>> 'https://mirror.hydra.gnu.org'... 100.0%
>> The following derivation will be built:
>>    /gnu/store/31bxx2nwp3lxzdkcy8bmybabfl1pi0af-grub.cfg.drv
>> Von Generation »10« zu »14« gewechselt
>> $ diff /var/guix/gcroots/bootcfg /boot/grub/grub.cfg
>> ## no-output, grub.cfg has still the same content->
>> /var/guix/gcroots/bootcfg changed
>> # guix system reconfigure confs/config.scm
>> ## mentions expected grub error
>> $ diff /var/guix/gcroots/bootcfg /boot/grub/grub.cfg
>> see diff [2]
>>
>> it does not seem to update /var/guix/gcroots/bootcfg.
>> and bootcfg somehow lists the generation number in the default entry.
> 
> Are you saying that ‘guix system switch-generation’ does not update the
> target of the /var/guix/gcroots/bootcfg symlink?  (From a quick look at
> the code it seems to update it.)

No, if you read it again, you see that 'switch-generation' updates it
correctly. 'reconfigure' doesn't seem to update it!

Martin

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