bug#36855: guix system switch-generation doesn't

[Mark H Weaver <mhw@netris.org>]

Hello again,

Mark H Weaver <mhw@netris.org> writes:

> Ludovic Courtès <ludo@gnu.org> writes:
>
>> Jakob, now that we generate scripts for the effectful bits of system
>> reconfiguration (one of these bits being service upgrades), couldn’t we
>> take it one step further and store those scripts in the “system”
>> derivation so we can run them eventually, notably upon
>> ‘switch-generation’?
>
> As a bonus, this approach might solve another issue I've observed: on my
> Guix system, where I build everything locally, several derivations are
> built *during* activation.  Based on the terminal output, I get the
> impression that the system is compiling things while the system in an
> intermediate state, when some of the activation steps have been done,
> but not all of them.
>
> As I recall, the derivations built during activation are limited to
> compiled modules for Guile, but it still sometimes takes on the order of
> a minute or two on my laptop to complete the "activating system" steps.
> This seems suboptimal.
>
> The next time I update my system, I'll try to remember to keep a
> transcript of this, so that I can be more specific.

Here's a transcript:

--8<---------------cut here---------------start------------->8---
activating system...
building /gnu/store/fbp6bbxw9cf617fmk57sddrz7zfsfw5p-module-import-compiled.drv...
building /gnu/store/wfi6hnr9ggal0s1d32xx5wbl5k5wqlvx-switch-to-system.scm.drv...
making '/gnu/store/mjzk53ia3bajn08lscpyzz5apcw3r70g-system' the current system...
setting up setuid programs in '/run/setuid-programs'...
populating /etc from /gnu/store/l7r1has973n26hfqrs6vxbi94xzgh360-etc...
building /gnu/store/h2fqcxv3xx14lkdhyphm3lawkayw7sdl-module-import-compiled.drv...
building /gnu/store/dar9smjyxmri6v6cchnmp5mpyiimyx64-install-bootloader.scm.drv...
guix system: bootloader successfully installed on '/dev/sda'
building /gnu/store/vkk3h5p799lfpmf6msdhrzlq0wqvk3zq-module-import-compiled.drv...
building /gnu/store/hn8sr8p13gg2mf379xawscabckp03fkb-upgrade-shepherd-services.scm.drv...
shepherd: Evaluating user expression (let* ((services (map primitive-load (?))) # ?) ?).
guix system: warning: only 3.9% of free space available on /gnu/store
hint: Consider deleting old profile generations and collecting garbage, along these lines:

     guix gc --delete-generations=1m

--8<---------------cut here---------------end--------------->8---

       Mark