implement that type explorers are only transfered once

Signed-off-by: Steven Armstrong <steven@icarus.ethz.ch>

lib/cdist/core/explorer.py

@@ -105,10 +105,14 @@ class Explorer(object):
     def transfer_type_explorers(self, cdist_type):
         """Transfer the type explorers for the given type to the remote side."""
         if cdist_type.explorers:
-            source = os.path.join(self.local.type_path, cdist_type.explorer_path)
-            destination = os.path.join(self.remote.type_path, cdist_type.explorer_path)
-            self.remote.mkdir(destination)
-            self.remote.transfer(source, destination)
+            if cdist_type.explorers_transferred:
+                log.debug("Skipping retransfer of type explorers for: %s", cdist_type)
+            else:
+                source = os.path.join(self.local.type_path, cdist_type.explorer_path)
+                destination = os.path.join(self.remote.type_path, cdist_type.explorer_path)
+                self.remote.mkdir(destination)
+                self.remote.transfer(source, destination)
+                cdist_type.explorers_transferred = True
 
     def transfer_object_parameters(self, cdist_object):
         """Transfer the parameters for the given object to the remote side."""