services: shepherd: Factorize ‘trigger’ action.

* gnu/services/shepherd.scm (shepherd-trigger-action): New variable.
* gnu/services/admin.scm (log-cleanup-shepherd-services)
(unattended-upgrade-shepherd-services): Use it.
* gnu/services/backup.scm (restic-backup-job->shepherd-service): Use it.
* gnu/home/services/shepherd.scm: Re-export ‘shepherd-trigger-action’.

Reviewed-by: Maxim Cournoyer <maxim.cournoyer@gmail.com>
Change-Id: I834b5b9b61c78f012ee9306df6cf4fd8a93dd6d2

gnu/home/services/shepherd.scm

@@ -52,7 +52,8 @@
                shepherd-service-modules
 
                shepherd-action
-               shepherd-configuration-action))
+               shepherd-configuration-action
+               shepherd-trigger-action))
 
 (define-record-type* <home-shepherd-configuration>
   home-shepherd-configuration make-home-shepherd-configuration

gnu/services/admin.scm

@@ -404,10 +404,7 @@ This service is deprecated and slated for removal after 2025-06-15.")
                              schedule)
                        (command '(#$program))))
              (stop #~(make-timer-destructor))
-             (actions (list (shepherd-action
-                             (name 'trigger)
-                             (documentation "Trigger log cleanup.")
-                             (procedure #~trigger-timer))))
+             (actions (list shepherd-trigger-action))
              (documentation "Periodically delete old log files."))))))
 
 (define log-cleanup-service-type
@@ -671,10 +668,7 @@ which lets you search for packages that provide a given file.")
                    ;; again.
                    #:wait-for-termination? #t))
          (stop #~(make-timer-destructor))
-         (actions (list (shepherd-action
-                         (name 'trigger)
-                         (documentation "Trigger unattended system upgrade.")
-                         (procedure #~trigger-timer)))))))
+         (actions (list shepherd-trigger-action)))))
 
 (define unattended-upgrade-service-type
   (service-type

gnu/services/backup.scm

@@ -255,11 +255,7 @@ command-line arguments to the current job @command{restic backup} invocation."))
                                                 max-duration)))
                       (stop
                        #~(make-timer-destructor))
-                      (actions (list (shepherd-action
-                                      (name 'trigger)
-                                      (documentation "Manually trigger a backup,
-without waiting for the scheduled time.")
-                                      (procedure #~trigger-timer)))))))
+                      (actions (list shepherd-trigger-action)))))
 
 (define (restic-guix-wrapper-package jobs)
   (package

gnu/services/shepherd.scm

@@ -72,6 +72,7 @@
             shepherd-action-procedure
 
             shepherd-configuration-action
+            shepherd-trigger-action
 
             %default-modules
 
@@ -404,6 +405,13 @@ of the service's configuration file."
                   (format #t "~a~%" #$file)
                   #$file))))
 
+(define shepherd-trigger-action
+  ;; Action to trigger a timer.
+  (shepherd-action
+   (name 'trigger)
+   (documentation "Trigger immediate execution of this timer.")
+   (procedure #~trigger-timer)))
+
 (define (shepherd-configuration-file services shepherd)
   "Return the shepherd configuration file for SERVICES.  SHEPHERD is used
 as shepherd package."