Debugging output for subscription issue

SoObjects/SOGo/SOGoGCSFolder.m

@@ -169,7 +169,10 @@ static NSArray *childRecordFields = nil;
   [newFolder setOwner: login];
   [newFolder setIsSubscription: localIsSubscription];
   if (![newFolder displayName])
-    newFolder = nil;
+    {
+      [self errorWithFormat: @"No displayName for %@", newFolder];
+      newFolder = nil;
+    }
 
   return newFolder;
 }

SoObjects/SOGo/SOGoParentFolder.m

@@ -291,18 +291,28 @@ static SoSecurityManager *sm = nil;
   // This is important because user A could delete folder X, and user B has subscribed to it.
   // If the "default roles" are enabled for calendars/address books, -validatePermission:.. will
   // work (grabbing the default role) and the deleted resource will be incorrectly returned.
-  if (subscribedFolder
-      && [subscribedFolder ocsFolderForPath: [subscribedFolder ocsPath]]
-      && ![sm validatePermission: SOGoPerm_AccessObject
-			onObject: subscribedFolder
-		       inContext: context])
+  if (!subscribedFolder)
     {
-      [subscribedSubFolders setObject: subscribedFolder
-			       forKey: [subscribedFolder nameInContainer]];
-      return YES;
+      [self errorWithFormat: @"Can't find subscription %@", sourceKey];
+      return NO;
     }
-  
-  return NO;
+  if (![subscribedFolder ocsFolderForPath: [subscribedFolder ocsPath]])
+    {
+      [self errorWithFormat: @"Folder vanished for subscription %@", sourceKey];
+      return NO;
+    }
+  if ([sm validatePermission: SOGoPerm_AccessObject
+                    onObject: subscribedFolder
+                   inContext: context])
+    {
+      [self errorWithFormat: @"User %@ has no right to access %@", [[context activeUser] login], sourceKey];
+      return NO;
+    }
+
+  [subscribedSubFolders setObject: subscribedFolder
+                           forKey: [subscribedFolder nameInContainer]];
+
+  return YES;
 }
 
 - (NSException *) appendSubscribedSources