Watch for over quota returned from CreateSliver() and say something useful.

apt/create_instance.in

@@ -979,6 +979,7 @@ else {
 	    $rval == GENIRESPONSE_INSUFFICIENT_NODES ||
 	    $rval == GENIRESPONSE_INSUFFICIENT_MEMORY ||
 	    $rval == GENIRESPONSE_INSUFFICIENT_BANDWIDTH ||
+	    $rval == GENIRESPONSE_NOSPACE ||
 	    $rval == GENIRESPONSE_NO_MAPPING) {
 	    AuditAbort()
 		if (!$debug);

protogeni/lib/GeniCM.pm.in

@@ -7061,6 +7061,10 @@ sub GeniExperiment($;$)
     GeniUtil::FlipToGeniUser();
 
     if ($saved_exitcode) {
+	if ($saved_exitcode >> 8 == ENOSPC) {
+	    return GeniResponse->Create(GENIRESPONSE_NOSPACE, undef,
+					"Over disk quota, please clean up");
+	}
 	return GeniResponse->Create(GENIRESPONSE_ERROR, undef,
 				    "Error creating container experiment");
     }

www/aptui/status.ajax

@@ -168,6 +168,15 @@ function Do_GetInstanceStatus()
             $blob["reason"]  = "Your topology source contains invalid ".
                 "values.\n\n";
         }
+        elseif ($webtask->exitcode() == GENIRESPONSE_NOSPACE) {
+            #
+            # Over Quota.
+            #
+            $blob["reason"]  = "You are over your disk quota at the target ".
+                "cluster, probably because of too many saved disk images. ".
+                "Please click on the 'Storage->My Disk Images' above and delete ".
+                "images you no longer need.";
+        }
         elseif ($webtask->exitcode() == GENIRESPONSE_STITCHER_ERROR) {
             #
             # This is GENIRESPONSE_STITCHER_ERROR which is a catch all.