25/42: services: hurd: Add dummy loopback.

[guix-commits]

janneke pushed a commit to branch wip-hurd-vm
in repository guix.

commit 075e414e85e8f1adb4cf42593341d4b9f2c1316c
Author: Jan (janneke) Nieuwenhuizen <jann...@gnu.org>
AuthorDate: Mon Apr 13 22:51:00 2020 +0200

    services: hurd: Add dummy loopback.
    
    * gnu/services/hurd.scm (hurd-loopback-shepherd-service,
    hurd-loopback-service-type): New function.
    (hurd-service->shepherd-service): Use them to support entry for dummy
    loopback.
---
 gnu/services/hurd.scm | 29 +++++++++++++++++++++++++++++
 1 file changed, 29 insertions(+)

diff --git a/gnu/services/hurd.scm b/gnu/services/hurd.scm
index 53fd492..5b3fabd 100644
--- a/gnu/services/hurd.scm
+++ b/gnu/services/hurd.scm
@@ -29,6 +29,7 @@
   #:use-module (ice-9 match)
   #:export (hurd-console-configuration
             hurd-console-service-type
+            hurd-loopback-service-type
             hurd-service->shepherd-service
             hurd-ttys-configuration
             hurd-ttys-service-type
@@ -48,6 +49,7 @@
       (($ <hurd-console-configuration>) (hurd-console-shepherd-service config))
       (($ <hurd-ttys-configuration>) (hurd-ttys-shepherd-service config))
       (($ <syslog-configuration>) (syslog-shepherd-service config))
+      (('loopback) (hurd-loopback-shepherd-service #f))
       (('user-processes) (hurd-user-processes-shepherd-service #f))
       (_ '()))))
 
@@ -145,6 +147,33 @@ Hurd.")))
 
 
 ;;;
+;;; Dummy hurd-loopback service, required for guix-daemon.
+;;;
+
+(define (hurd-loopback-shepherd-service _)
+  "Return the 'loopback' Shepherd service."
+
+  (list (shepherd-service
+         (documentation "Dummy for bootstrapping (gnu services) on the Hurd.")
+         (provision '(loopback))
+         (requirement '())
+         (start #~(const #t))
+         (stop #~(const #t))
+         (respawn? #f))))
+
+(define hurd-loopback-service-type
+  (service-type
+   (name 'loopback)
+   (extensions (list (service-extension shepherd-root-service-type
+                                        hurd-loopback-shepherd-service)))
+   (compose concatenate)
+   (extend append)
+   (default-value '(loopback)) ;canary for hurd-service->shepherd-service
+   (description "Dummy service to bootstrap (gnu services) on the
+Hurd.")))
+
+
+;;;
 ;;; Simple wrapper for <hurd>/libexec/runttys.
 ;;;