diff -r 2af6b2d8d1d8 -r aad4b46e89bb mercurial/changegroup.py
--- a/mercurial/changegroup.py	Fri Aug 10 13:59:27 2018 -0700
+++ b/mercurial/changegroup.py	Fri Aug 10 14:20:47 2018 -0700
@@ -253,7 +253,8 @@
         # be empty during the pull
         self.manifestheader()
         deltas = self.deltaiter()
-        repo.manifestlog.addgroup(deltas, revmap, trp)
+        # TODO this violates storage abstraction.
+        repo.manifestlog._revlog.addgroup(deltas, revmap, trp)
         prog.complete()
         self.callback = None