Re: Some general guix questions

[Divan Santana]

Tonton <address@hidden> writes:

> On Tue, 08 Jan 2019 18:43:06 +0200
> Divan Santana <address@hidden> wrote:
>
>> 3. If I run guix system vm --fallback system.scm I get a vm I can run,
>>    which is really awesome. If I then do a guix pull and guix system
>>    vm --fallback system.scm I get /another/ VM which I can run. How is
>>    the previous VMs garbage collected, I wonder?
>
> A note on garbage collection in guix: most everything lives in the store.
> vm's, packages, your operating system, previous generations of operating
> systems.
>
> All entries can have what's called GC roots. As far as I understand a root is
> a symbolic link somewhere else on the filesystem. So if you create a vm it
> will remain in your store until guix gc is run WHILE the vm has no roots.
>
> So to clear space you would have to delete the roots for previous generations
> of your system or packages. guix package has a command for this, guix system
> does not have this yet (I think). A roundabout way to delete system
> generations is to delete the symlink/root in '/var/guix/profiles/' and then
> run guix gc. Be careful what you delete.

Great thanks!