smokeping module: fix missing js, broken alerts

The initial commit accidentally left in some commented code and if you were
using alerts, they simply didn't work.

Smokeping also includes some JS code for the webui allowing you to zoom into
graphs and it was not passed into the homedir. Additionally, generate
static html pages for other webservers to serve the cache directory.

Add additional options to specify sendmail path or mailhost and verify that both
are not set.

Add one extra config hook that allows you to bypass all of the invidual config
stanzas and just hand it a string.

nixos/modules/services/networking/smokeping.nix

@@ -6,23 +6,28 @@ let
   cfg = config.services.smokeping;
   smokepingHome = "/var/lib/smokeping";
   smokepingPidDir = "/run";
-  configFile = ''
+  configFile =
+    if cfg.config == null
+      then
+        ''
           *** General ***
           owner = ${cfg.owner}
           contact = ${cfg.ownerEmail}
-    mailhost = ${cfg.mailHost}
-    #sendmail = /var/setuid-wrappers/sendmail
+          ${lib.optionalString (cfg.mailHost != "") "mailhost = ${cfg.mailHost}"}
+          ${lib.optionalString (cfg.sendmail != null) "sendmail = ${cfg.sendmail}"}
           imgcache = ${smokepingHome}/cache
           imgurl   = http://${cfg.hostName}:${builtins.toString cfg.port}/cache
           datadir  = ${smokepingHome}/data
+          pagedir = ${smokepingHome}/cache
           piddir  = ${smokepingPidDir}
           cgiurl   = http://${cfg.hostName}:${builtins.toString cfg.port}/smokeping.cgi
+          linkstyle = ${cfg.linkStyle}
           smokemail = ${cfg.smokeMailTemplate}
           *** Presentation ***
           template = ${cfg.presentationTemplate}
           ${cfg.presentationConfig}
-    #*** Alerts ***
-    #${cfg.alertConfig}
+          *** Alerts ***
+          ${cfg.alertConfig}
           *** Database ***
           ${cfg.databaseConfig}
           *** Probes ***
@@ -30,7 +35,10 @@ let
           *** Targets ***
           ${cfg.targetConfig}
           ${cfg.extraConfig}
-  '';
+        ''
+      else
+        cfg.config;
+
   configPath = pkgs.writeText "smokeping.conf" configFile;
   cgiHome = pkgs.writeScript "smokeping.fcgi" ''
     #!${pkgs.bash}/bin/bash
@@ -59,8 +67,15 @@ in
       };
       mailHost = mkOption {
         type = types.string;
-        default = "127.0.0.1";
-        description = "Use this SMTP server rather than localhost";
+        default = "";
+        example = "localhost";
+        description = "Use this SMTP server to send alerts";
+      };
+      sendmail = mkOption {
+        type = types.nullOr types.path;
+        default = null;
+        example = "/var/setuid-wrappers/sendmail";
+        description = "Use this sendmail compatible script to deliver alerts";
       };
       smokeMailTemplate = mkOption {
         type = types.string;
@@ -71,6 +86,7 @@ in
       package = mkOption {
         type = types.package;
         default = pkgs.smokeping;
+        defaultText = "pkgs.smokeping";
         description = "Specify a custom smokeping package";
       };
       owner = mkOption {
@@ -85,6 +101,12 @@ in
         example = "somewhere.example.com";
         description = "DNS name for the urls generated in the cgi.";
       };
+      linkStyle = mkOption {
+        type = types.enum ["original" "absolute" "relative"];
+        default = "relative";
+        example = "absolute";
+        description = "DNS name for the urls generated in the cgi.";
+      };
       port = mkOption {
         type = types.int;
         default = 8081;
@@ -132,7 +154,10 @@ in
       };
       alertConfig = mkOption {
         type = types.string;
-        default = "";
+        default = ''
+          to = root@localhost
+          from = smokeping@localhost
+        '';
         example = literalExample ''
           to = alertee@address.somewhere
           from = smokealert@company.xy
@@ -223,12 +248,26 @@ in
         default = "";
         description = "Any additional customization not already included.";
       };
+      config = mkOption {
+        type = types.nullOr types.string;
+        default = null;
+        description = "Full smokeping config supplied by the user. Overrides " +
+          "and replaces any other configuration supplied.";
+      };
 
     };
 
   };
 
   config = mkIf cfg.enable {
+    assertions = [
+      {
+        assertion = !(cfg.sendmail != null && cfg.mailHost != "");
+        message = "services.smokeping: sendmail and Mailhost cannot both be enabled.";
+      }
+    ];
+    security.setuidPrograms = [ "fping" ];
+    environment.systemPackages = [ pkgs.fping ];
     users.extraUsers = singleton {
       name = cfg.user;
       isNormalUser = false;
@@ -243,9 +282,12 @@ in
       serviceConfig.PermissionsStartOnly = true;
       preStart = ''
         mkdir -m 0755 -p ${smokepingHome}/cache ${smokepingHome}/data
+        rm -f ${smokepingHome}/cropper
+        ln -s ${cfg.package}/htdocs/cropper ${smokepingHome}/cropper
         chown -R ${cfg.user} ${smokepingHome}
         cp ${cgiHome} ${smokepingHome}/smokeping.fcgi
         ${cfg.package}/bin/smokeping --check --config=${configPath}
+        ${cfg.package}/bin/smokeping --static --config=${configPath}
       '';
       script = ''${cfg.package}/bin/smokeping --config=${configPath} --nodaemon'';
     };
@@ -253,8 +295,9 @@ in
       wantedBy = [ "multi-user.target"];
       requires = [ "smokeping.service"];
       partOf = [ "smokeping.service"];
-      path = with pkgs; [ bash rrdtool smokeping ];
-      script = ''${pkgs.thttpd}/bin/thttpd -u ${cfg.user} -c "**.fcgi" -d ${smokepingHome} -p ${builtins.toString cfg.port} -D'';
+      path = with pkgs; [ bash rrdtool smokeping thttpd ];
+      script = ''thttpd -u ${cfg.user} -c "**.fcgi" -d ${smokepingHome} -p ${builtins.toString cfg.port} -D -nos'';
+      serviceConfig.Restart = "always";
     };
   };
 }

nixos/tests/smokeping.nix

@@ -11,9 +11,10 @@ import ./make-test.nix ({ pkgs, ...} : {
         services.smokeping = {
           enable = true;
           port = 8081;
+          mailHost = "127.0.0.2";
           probeConfig = ''
             + FPing
-            binary = ${pkgs.fping}/bin/fping
+            binary = /var/setuid-wrappers/fping
             offset = 0%
           '';
         };
@@ -27,5 +28,6 @@ import ./make-test.nix ({ pkgs, ...} : {
     $sm->waitForFile("/var/lib/smokeping/data/Local/LocalMachine.rrd");
     $sm->succeed("curl -s -f localhost:8081/smokeping.fcgi?target=Local");
     $sm->succeed("ls /var/lib/smokeping/cache/Local/LocalMachine_mini.png");
+    $sm->succeed("ls /var/lib/smokeping/cache/index.html");
   '';
 })