* Added a status page that shows all the currently executing build steps.

* Store the system type in the BuildSteps table.
* Don't query the queue size when serving static pages.  This prevents
  two unnecessary database queries per request.

src/root/static/css/hydra.css

@@ -53,10 +53,15 @@ tr.clickable:hover {
     background-color: #E6EEFF;
     cursor: pointer;
 }
+
 td.centered {
     text-align: center;
 }
 
+td.right {
+    text-align: right;
+}
+
 
 .layoutTable td, .layoutTable th {
     border-style: none;

src/root/status.tt

@@ -0,0 +1,24 @@
+[% WRAPPER layout.tt title="Hydra status" %]
+[% PROCESS common.tt %]
+
+<h1>Hydra Status</h1>
+
+<table class="tablesorter">
+  <thead>
+    <tr><th>Machine</th><th>Type</th><th>Build</th><th>Step</th><th>What</th><th>Since</th></tr>
+  </thead>
+  <tbody>
+    [% FOREACH step IN steps %]
+      <tr>
+        <td><tt>[% IF step.machine; step.machine.match('@(.*)').0; ELSE; 'localhost'; END %]</tt></td>
+        <td><tt>[% step.system %]</tt></td>
+        <td><a href="[% c.uri_for('/build' step.build.id) %]">[% step.build.id %]</a></td>
+        <td><a href="[% c.uri_for('/build' step.build.id 'nixlog' step.stepnr) %]">[% step.stepnr %]</a></td>
+        <td><tt>[% step.outpath.match('-(.*)').0 %]</tt></td>
+        <td class='right'>[% INCLUDE renderDuration duration = curTime - step.starttime %] </td>
+      </tr>
+    [% END %]
+  </tbody>
+</table>
+
+[% END %]