bug#31841: ./pre-inst-env guix system no longer works without ~/.config/guix

[ludo@gnu.org (Ludovic Courtès)]

Hello,

myglc2@gmail.com skribis:

> On 06/17/2018 at 22:53 Ludovic Courtès writes:
>
>> Hello,
>>
>> Mark H Weaver <mhw@netris.org> skribis:
>>
>>> I should emphasize that when running Guix this way, if you wish to avoid
>>> running 'guix pull', it's important to always keep at least one
>>> known-good development environment for Guix saved as a GC root.  Toward
>>> that end, when I run "guix environment guix" to update my development
>>> environment profile, I make sure to preserve my previous profile as a GC
>>> root until I'm confident that my new profile is working.
>>
>> The “make as-derivation” command aims to help with this bootstrapping
>> problem: given an already installed Guix, it builds your checkout and
>> its dependencies like ‘guix pull’ would do.  Thus, you can run:
>>
>>   $(make as-derivation)/bin/guix environment guix
>
> Nice! This is news to me. Thank you for pointing it out.
>
> Does 'make as-derivation' set the "current" symlink normally set by
> 'guix pull'?

Not at all; only ‘guix pull’ does.

Ludo’.