CC-2737: Show disk space used/space available/ disk quota enforcement

-modify airtime-check-system to return values instead of printing
 them directly
-add ability to view select airtime-check-system via web interface

airtime_mvc/application/models/Systemstatus.php

@@ -0,0 +1,46 @@
+<?php
+
+class Application_Model_Systemstatus
+{
+
+    private function getCheckSystemResults(){
+        exec("airtime-check-system", $output);
+
+        //require_once "/usr/lib/airtime/utils/airtime-check-system.php";
+
+        $status = array();
+        foreach($output as $row){
+            $row = trim($row);
+            if (substr_count($row, "=") == 1 && "--" != substr($row, 0, 2)){
+                list($key, $value) = array_map("trim", explode("=", $row));
+                $status[$key] = $value;
+            }
+        }
+
+        return $status;
+    }
+
+    public function getResults(){
+        $keyValues = $this->getCheckSystemResults();
+
+        $results = array();
+        $key = "AIRTIME_VERSION";
+        $results[$key] = array("Airtime Version", $keyValues[$key], false);
+
+        $triplets = array(array("PLAYOUT_ENGINE_RUNNING_SECONDS", "Playout Engine Status", true),
+                array("LIQUIDSOAP_RUNNING_SECONDS", "Liquidsoap Status", true),
+                array("MEDIA_MONITOR_RUNNING_SECONDS", "Media-Monitor Status", true),
+                array("SHOW_RECORDER_RUNNING_SECONDS", "Show-Recorder Status", true));
+                
+        foreach($triplets as $triple){
+            list($key, $desc, $downloadLog) = $triple;
+            $results[$key] = array($desc, $this->convertRunTimeToPassFail($keyValues[$key]), $downloadLog); 
+        }
+
+        return $results;
+    }
+
+    private function convertRunTimeToPassFail($runTime){
+        return $runTime > 3 ? "Pass" : "Fail";
+    }
+}