Re: Defining user services in Guix.

[Mathieu Othacehe <m.othacehe@gmail.com>]

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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

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From caf7d9f5a7875663623b24662c1c23b99e60c5ad Mon Sep 17 00:00:00 2001
From: Mathieu Othacehe <m.othacehe@gmail.com>
Date: Fri, 28 Apr 2017 17:09:53 +0200
Subject: [PATCH] services: herd: Make %shepherd-socket-file a parameter and
 export it.

* gnu/services/herd.scm (%shepherd-socket-file): Make it an exported
  parameter.
(open-connection): Adapt.
---
 gnu/services/herd.scm | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/gnu/services/herd.scm b/gnu/services/herd.scm
index 03bfbf1d7..f8d60a480 100644
--- a/gnu/services/herd.scm
+++ b/gnu/services/herd.scm
@@ -1,5 +1,6 @@
 ;;; GNU Guix --- Functional package management for GNU
 ;;; Copyright © 2016 Ludovic Courtès <ludo@gnu.org>
+;;; Copyright © 2017 Mathieu Othacehe <m.othacehe@gmail.com>
 ;;;
 ;;; This file is part of GNU Guix.
 ;;;
@@ -23,7 +24,9 @@
   #:use-module (srfi srfi-34)
   #:use-module (srfi srfi-35)
   #:use-module (ice-9 match)
-  #:export (shepherd-error?
+  #:export (%shepherd-socket-file
+
+            shepherd-error?
             service-not-found-error?
             service-not-found-error-service
             action-not-found-error?
@@ -58,9 +61,9 @@
 ;;; Code:
 
 (define %shepherd-socket-file
-  "/var/run/shepherd/socket")
+  (make-parameter "/var/run/shepherd/socket"))
 
-(define* (open-connection #:optional (file %shepherd-socket-file))
+(define* (open-connection #:optional (file (%shepherd-socket-file)))
   "Open a connection to the daemon, using the Unix-domain socket at FILE, and
 return the socket."
   ;; The protocol is sexp-based and UTF-8-encoded.
-- 
2.12.2