gnu: mcron: Add traditional cron service.

TODO: write good changelog entry
Change-Id: Ib1e8f1afcbaae302eac51883e3b02a1d2c32a89e

1 files changed, 53 insertions, 1 deletions

diff --git a/gnu/services/mcron.scm b/gnu/services/mcron.scm
index 0e0d07d252..a2bc1a5553 100644
--- a/gnu/services/mcron.scm
+++ b/gnu/services/mcron.scm
@@ -20,8 +20,12 @@
 
 (define-module (gnu services mcron)
   #:use-module (gnu services)
+  #:use-module ((gnu services configuration) #:select
+                (define-configuration/no-serialization))
   #:use-module (gnu services shepherd)
+  #:use-module (gnu system setuid)
   #:use-module (gnu packages guile-xyz)
+  #:use-module ((guix packages) #:select (package?))
   #:use-module (guix records)
   #:use-module (guix gexp)
   #:use-module (srfi srfi-1)
@@ -37,7 +41,12 @@
             mcron-configuration-date-format
             mcron-configuration-home-service?
 
-            mcron-service-type))
+            mcron-service-type
+
+            cron-daemon-configuration
+            cron-daemon-configuration-cron
+            cron-daemon-configuration-
+            cron-daemon-service-type))
 
 ;;; Commentary:
 ;;;
@@ -214,4 +223,47 @@ files."
                                          jobs)))))
                 (default-value (mcron-configuration)))) ;empty job list
 
+
+
+(define-configuration/no-serialization cron-daemon-configuration
+  (cron
+   (package mcron)
+   "The cron package to use.")
+  (monitor-etc?
+   (boolean #f)
+   "Whether to check /etc/crontab for updates."))
+
+(define (cron-daemon-shepherd-services config)
+  (list (shepherd-service
+         (provision '(cron-daemon))
+         (start #~(make-forkexec-constructor
+                   '(#$(file-append (cron-daemon-configuration-cron config)
+                                    "/sbin/cron")
+                     #$@(if (cron-daemon-configuration-monitor-etc? config)
+                            '()
+                            '("--noetc")))
+                   #:pid-file "/var/run/cron.pid"))
+         (stop #~(make-kill-destructor)))))
+
+(define cron-daemon-activation
+  (const #~(mkdir-p "/var/cron/tabs")))
+
+(define (cron-daemon-setuid-programs config)
+  (list (file-like->setuid-program
+         (file-append (cron-daemon-configuration-cron config)
+                      "/sbin/crontab-access"))))
+
+(define cron-daemon-service-type
+  (service-type (name 'cron-daemon)
+                (description
+                 "Run the traditional cron daemon.")
+                (extensions
+                 (list (service-extension shepherd-root-service-type
+                                          cron-daemon-shepherd-services)
+                       (service-extension activation-service-type
+                                          cron-daemon-activation)
+                       (service-extension setuid-program-service-type
+                                          cron-daemon-setuid-programs)))
+                (default-value (cron-daemon-configuration))))
+
 ;;; mcron.scm ends here