--- a/mercurial/bundle2.py	Wed Apr 16 18:41:48 2014 -0400
+++ b/mercurial/bundle2.py	Wed Apr 16 14:09:35 2014 -0400
@@ -280,9 +280,6 @@
     """
     op = bundleoperation(repo, transactiongetter)
     # todo:
-    # - only create reply bundle if requested.
-    op.reply = bundle20(op.ui)
-    # todo:
     # - replace this is a init function soon.
     # - exception catching
     unbundler.params
@@ -674,3 +671,11 @@
     assert not h
     if heads != op.repo.heads():
         raise exchange.PushRaced()
+
+@parthandler('replycaps')
+def handlereplycaps(op, inpart):
+    """Notify that a reply bundle should be created
+
+    Will convey bundle capability at some point too."""
+    if op.reply is None:
+        op.reply = bundle20(op.ui)