Fix small UI bugs around uploading dockerfiles

Fixes #606

- Raises an error when a non-200 code is returned
- Resets the dialog when reopened
- Has a nicer error message for 413 errors

static/js/directives/ui/dockerfile-build-dialog.js

@@ -52,6 +52,7 @@ angular.module('quay').directive('dockerfileBuildDialog', function () {
         if (sn && $scope.repository) {
           $scope.viewTriggers = false;
           $scope.startTrigger = null;
+          $scope.errorMessage = null;
 
           $element.find('.dockerfilebuildModal').modal({});
 

static/js/directives/ui/dockerfile-build-form.js

@@ -196,21 +196,36 @@ angular.module('quay').directive('dockerfileBuildForm', function () {
             }
           });
         };
+
         request.onerror = function() {
           $scope.$apply(function() {
             handleUploadFailed();
           });
         };
+
         request.onreadystatechange = function() {
           var state = request.readyState;
+          var status = request.status;
+
           if (state == 4) {
-            $scope.$apply(function() {
-              startBuild(fileId);
-              $scope.uploading = false;
-            });
-            return;
+            if (Math.floor(status / 100) == 2) {
+              $scope.$apply(function() {
+                startBuild(fileId);
+                $scope.uploading = false;
+              });
+            } else {
+              var message = request.statusText;
+              if (status == 413) {
+                message = 'Selected file too large to upload';
+              }
+
+              $scope.$apply(function() {
+                handleUploadFailed(message);
+              });
+            }
           }
         };
+
         request.send(file);
       };