* Declarative specification of the system cron jobs. Ideally

this would abstract over the Crontab syntax though.

svn path=/nixos/trunk/; revision=10447

system/options.nix

@@ -528,6 +528,24 @@
     };
 
 
+    cron = {
+
+      systemCronJobs = mkOption {
+        default = [];
+        example = [
+          "* * * * *  test   ls -l / > /tmp/cronout 2>&1"
+          "* * * * *  eelco  echo Hello World > /home/eelco/cronout"
+        ];
+        description = ''
+          A list of Cron jobs to be appended to the system-wide
+          crontab.  See the manual page for crontab for the expected
+          format.
+        '';
+      };
+
+    };
+
+
     ttyBackgrounds = {
 
       enable = mkOption {

upstart-jobs/cron.nix

@@ -1,15 +1,35 @@
-{cron}:
+{pkgs, config}:
 
+let
+
+  systemCronJobs = config.services.cron.systemCronJobs;
+
+  systemCronJobsFile = pkgs.writeText "system-crontab" ''
+    SHELL=${pkgs.bash}/bin/sh
+    PATH=${pkgs.coreutils}/bin
+    MAILTO=
+    ${pkgs.lib.concatStrings (map (job: job + "\n") systemCronJobs)}
+  '';
+
+in
+  
 {
   name = "cron";
   
-  job = "
-description \"Cron daemon\"
+  extraEtc = [
+    # The system-wide crontab.
+    { source = systemCronJobsFile;
+      target = "crontab";
+      mode = "0600"; # Cron requires this.
+    }
+  ];
 
-start on startup
-stop on shutdown
+  job = ''
+    description "Cron daemon"
 
-respawn ${cron}/sbin/cron -n
-  ";
-  
+    start on startup
+    stop on shutdown
+
+    respawn ${pkgs.cron}/sbin/cron -n
+  '';
 }

upstart-jobs/default.nix

@@ -78,7 +78,7 @@ let
 
     # Cron daemon.
     (import ../upstart-jobs/cron.nix {
-      inherit (pkgs) cron;
+      inherit config pkgs;
     })
 
     # Name service cache daemon.