munin: add test and fix a bug

nixos/modules/services/monitoring/munin.nix

@@ -195,10 +195,9 @@ in
     system.activationScripts.munin-node = ''
       echo "updating munin plugins..."
 
-      export PATH="/run/current-system/sw/bin:/run/current-system/sw/sbin";
       mkdir -p /etc/munin/plugins
       rm -rf /etc/munin/plugins/*
-      ${pkgs.munin}/sbin/munin-node-configure --shell --families contrib,auto,manual --config ${nodeConf} --libdir=${muninPlugins} --servicedir=/etc/munin/plugins 2>/dev/null | ${pkgs.bash}/bin/bash
+      PATH="/run/current-system/sw/bin:/run/current-system/sw/sbin" ${pkgs.munin}/sbin/munin-node-configure --shell --families contrib,auto,manual --config ${nodeConf} --libdir=${muninPlugins} --servicedir=/etc/munin/plugins 2>/dev/null | ${pkgs.bash}/bin/bash
     '';
 
   }) (mkIf cronCfg.enable {

nixos/tests/default.nix

@@ -21,6 +21,7 @@ with import ../lib/testing.nix { inherit system minimal; };
   #mpich = makeTest (import ./mpich.nix);
   mysql = makeTest (import ./mysql.nix);
   mysql_replication = makeTest (import ./mysql-replication.nix);
+  munin = makeTest (import ./munin.nix);
   nat = makeTest (import ./nat.nix);
   nfs3 = makeTest (import ./nfs.nix { version = 3; });
   #nfs4 = makeTest (import ./nfs.nix { version = 4; });

nixos/tests/munin.nix

@@ -0,0 +1,31 @@
+{ pkgs, ... }:
+
+# This test runs basic munin setup with node and cron job running on the same
+# machine.
+
+{
+  nodes = { 
+    one =
+      { config, pkgs, ... }:
+        { 
+          services = {
+           munin-node.enable = true;
+           munin-cron = {
+             enable = true;
+             hosts = ''
+               [${config.networking.hostName}]
+               address localhost
+             '';
+           };
+          };
+        };
+    };
+  
+  testScript = ''
+    startAll;
+  
+    $one->waitForUnit("munin-node.service");
+    $one->waitForFile("/var/lib/munin/one/one-uptime-uptime-g.rrd");
+    $one->waitForFile("/var/www/munin/one/index.html");
+  '';
+}