CPack/DragNDrop: Place the background image file in a hidden folder

By using a hidden folder we avoid the need to mark the file as hidden
from finder, and it makes it easier for future work to refer to the
background image file.

Source/CPack/cmCPackDragNDropGenerator.cxx

@@ -400,6 +400,7 @@ int cmCPackDragNDropGenerator::CreateDMG(const std::string& src_dir,
 
   // Optionally add a custom background image ...
   // Make sure the background file type is the same as the custom image
+  // and that the file is hidden so it doesn't show up.
   if(!cpack_dmg_background_image.empty())
     {
     const std::string extension =
@@ -409,7 +410,7 @@ int cmCPackDragNDropGenerator::CreateDMG(const std::string& src_dir,
 
     std::ostringstream package_background_destination;
     package_background_destination << staging.str()
-                                   << "/background" << extension;
+                                   << "/.background/background" << extension;
 
     if(!this->CopyFile(package_background_source,
         package_background_destination))
@@ -421,21 +422,6 @@ int cmCPackDragNDropGenerator::CreateDMG(const std::string& src_dir,
 
       return 0;
       }
-
-    std::ostringstream temp_background_hiding_command;
-    temp_background_hiding_command << this->GetOption("CPACK_COMMAND_SETFILE");
-    temp_background_hiding_command << " -a V \"";
-    temp_background_hiding_command << package_background_destination.str();
-    temp_background_hiding_command << "\"";
-
-    if(!this->RunCommand(temp_background_hiding_command))
-      {
-        cmCPackLogger(cmCPackLog::LOG_ERROR,
-          "Error setting attributes on disk volume background image."
-          << std::endl);
-
-      return 0;
-      }
     }
 
   // Create a temporary read-write disk image ...