Hi,

> Agreed.  A ‘guix user’ tool (or similar) could talk to the user’s
> Shepherd instance to upgrade user services like
> ‘upgrade-shepherd-services’ does in (guix scripts system).

With the attached patch, it is possibe to use (gnu services herd) to
interact with a user shepherd instance.

For instance :

--8<---------------cut here---------------start------------->8---
(use-modules (gnu services herd))
(parameterize
 ((%shepherd-socket-file "/home/mathieu/.config/shepherd/run/socket"))
 (current-services))
--8<---------------cut here---------------end--------------->8---

Which returns :

--8<---------------cut here---------------start------------->8---
$1 = (#<<live-service> provision: (redshift) requirement: () running: 3632> #<<live-service> provision: (root shepherd) requirement: () running: #t>)
--8<---------------cut here---------------end--------------->8---

Based on that, I'll try to define a guix user command to upgrade user
services if it is ok for everyone :).

Thanks,

Mathieu