Adding Monit - one more service to watch system..

svn path=/nixos/trunk/; revision=18399

modules/module-list.nix

@@ -56,6 +56,7 @@
   ./services/misc/nixos-manual.nix
   ./services/misc/rogue.nix
   ./services/misc/synergy.nix
+  ./services/monitoring/monit.nix
   ./services/monitoring/nagios/default.nix
   ./services/monitoring/zabbix-agent.nix
   ./services/monitoring/zabbix-server.nix

modules/services/monitoring/monit.nix

@@ -0,0 +1,51 @@
+# Monit system watcher
+# http://mmonit.org/monit/
+
+{config, pkgs, ...}: 
+
+let inherit (pkgs.lib) mkOption;
+in
+
+{
+  options = {
+    services.monit = {
+      enable = mkOption {
+        default = false;
+        description = ''
+          Whether to run Monit system watcher.
+        '';
+      };
+      config = mkOption {
+        default = "";
+        description = "monit.conf content";
+      };
+      startOn = mkOption {
+        default = "networking/started";
+        description = "What Monit supposes to be already present";
+      };
+    };
+  };
+  
+  config = {
+    environment.etc = [
+      {
+        source = pkgs.writeTextFile {
+          name = "monit.conf";
+          text = config.services.monit.config;
+        };
+        target = "monit.conf";
+        mode = "0400";
+      }
+    ];
+    jobs.monit = {
+      description = "Monit system watcher";
+      
+      startOn = config.services.monit.startOn;
+      stopOn = "shutdown";
+
+      exec = "${pkgs.monit}/bin/monit -I -c /etc/monit.conf";
+
+      respawn = true;
+    };
+  };
+}