Add new iocage API call to list resource usage for jails.

REST Request:
-------------------------------
PUT /sysadm/iocage
{
   "action" : "df"
}

WebSocket Request:
-------------------------------
{
   "namespace" : "sysadm",
   "name" : "iocage",
   "id" : "fooid",
   "args" : {
      "action" : "df"
   }
}

Response:
-------------------------------
{
  "args": {
    "df": {
      "f250ab25-d062-11e5-8209-d05099728dbf": {
        "ava": "83.4G",
        "crt": "2.30x",
        "qta": "none",
        "res": "none",
        "tag": "test",
        "use": "1.69M"
      },
      "f39318ae-d064-11e5-8209-d05099728dbf": {
        "ava": "83.4G",
        "crt": "2.30x",
        "qta": "none",
        "res": "none",
        "tag": "test2",
        "use": "1.69M"
      }
    }
  },
  "id": "fooid",
  "name": "response",
  "namespace": "sysadm"
}

src/server/WebBackend.cpp

@@ -471,6 +471,10 @@ RestOutputStruct::ExitCode WebSocket::EvaluateSysadmIocageRequest(const QJsonVal
     bool ok = false;
     if(keys.contains("action")){
       QString act = JsonValueToString(in_args.toObject().value("action"));
+      if(act=="df"){
+	ok = true;
+        out->insert("df", sysadm::Iocage::df());
+      }
       if(act=="destroyjail"){
 	ok = true;
         out->insert("destroyjail", sysadm::Iocage::destroyJail(in_args.toObject()));

src/server/library/sysadm-iocage.cpp

@@ -12,6 +12,41 @@ using namespace sysadm;
 
 //PLEASE: Keep the functions in the same order as listed in pcbsd-general.h
 
+// Show resource usage for jails on the box
+QJsonObject Iocage::df() {
+  QJsonObject retObject;
+
+  // Get the key values
+  QStringList output = General::RunCommand("iocage df").split("\n");
+  QJsonObject vals;
+
+  for ( int i = 0; i < output.size(); i++)
+  {
+    // Null output at first
+    if ( output.at(i).isEmpty() )
+      continue;
+
+    QJsonObject jail;
+    QString line = output.at(i).simplified();
+    QString uuid = line.section(" ", 0, 0);
+
+    // Otherwise we get a list of what we already know.
+    if ( line.section(" ", 0, 0) == "UUID" )
+      continue;
+
+    jail.insert("crt", line.section(" ", 1, 1));
+    jail.insert("res", line.section(" ", 2, 2));
+    jail.insert("qta", line.section(" ", 3, 3));
+    jail.insert("use", line.section(" ", 4, 4));
+    jail.insert("ava", line.section(" ", 5, 5));
+    jail.insert("tag", line.section(" ", 6, 6));
+
+    retObject.insert(uuid, jail);
+  }
+
+  return retObject;
+}
+
 // Destroy a jail on the box
 QJsonObject Iocage::destroyJail(QJsonObject jsin) {
   QJsonObject retObject;

src/server/library/sysadm-iocage.h

@@ -14,6 +14,7 @@ namespace sysadm{
 
 class Iocage{
 public:
+	static QJsonObject df();
 	static QJsonObject destroyJail(QJsonObject);
 	static QJsonObject createJail(QJsonObject);
 	static QJsonObject cloneJail(QJsonObject);