bug#51141: guix home reconfigure does not apply changes to shepherd services

[Oleg Pykhalov]

Andrew Tropin <andrew@trop.in> writes:

[…]

> According to what I see in the shepherd tests:
> https://git.savannah.gnu.org/cgit/shepherd.git/tree/tests/replacement.sh?h=4c5176f5a7a5a1e7d7f258f585e8ed127a21b99a#n61
>
> and how it's implemented in home-shepherd:
> https://git.savannah.gnu.org/cgit/guix.git/tree/gnu/home/services/shepherd.scm?h=7c3f28fdc4edc00f66801cd51a5ba08eee44f77f#n59
>
> It should work as you expect it.

It doesn't.

> Tried to do the following: I updated documentation field for a shepherd
> service, reconfigured and it got loaded after I restarted a service.
>
> ~ $ herd doc state
> Init, update and maybe destroy state.
> ~ $ herd restart state
> Service state has been stopped.
> Service state has been started.
> ~ $ herd doc state
> Really init, update and maybe destroy state.
>
> Didn't check if start action gexp is updated too, but I expect it was.

The start action is the interest, or configuration record, or service
extension.

(guix scripts system reconfigure) has a upgrade-shepherd-services
procedure, which was created in 240b57f0ca576708ebf6cfa0dfe2803fa9ff2323
and discussed in https://issues.guix.gnu.org/22039


[ The following text only describes how to reproduce the issue. ]


When I tried to write goimapnotify service no changes applied after
modifications in home-goimapnotify-shepherd-service [1] and [2], which
are typical service-type and record.  I didn't have similar issues with
self-written system services.

[1]: 
https://gitlab.com/wigust/dotfiles/-/blob/ea2111906233099267f3b581b4aae39ad9645c2d/dotfiles/guixsd/modules/home/services/mail.scm#L28-45
[2]: 
https://gitlab.com/wigust/dotfiles/-/blob/ea2111906233099267f3b581b4aae39ad9645c2d/dotfiles/guixsd/home.scm#L40-65


Service extension also requires to unload service, e.g. mcron service
extension in [1] and [2].

[1]: 
https://gitlab.com/wigust/dotfiles/-/blob/ea2111906233099267f3b581b4aae39ad9645c2d/dotfiles/guixsd/modules/home/services/package-management.scm#L16-50
[2]: 
https://gitlab.com/wigust/dotfiles/-/blob/ea2111906233099267f3b581b4aae39ad9645c2d/dotfiles/guixsd/home.scm#L154-161

If I remove the guix-delete-generations service from home configuration,
mcron job still exists according to 'herd schedule mcron'.
--8<---------------cut here---------------start------------->8---
(home-environment
 (services
  (list (service guix-delete-generations-service-type ;; ...
                 ))))
--8<---------------cut here---------------end--------------->8---

Oleg.

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