diff -r b51bf961b3cb -r 7abab875e647 mercurial/bundlerepo.py
--- a/mercurial/bundlerepo.py	Wed Mar 23 16:02:11 2011 +0100
+++ b/mercurial/bundlerepo.py	Wed Mar 23 16:06:55 2011 +0100
@@ -286,15 +286,17 @@
         repopath, bundlename = parentpath, path
     return bundlerepository(ui, repopath, bundlename)
 
-def getremotechanges(ui, repo, other, revs=None, bundlename=None, force=False):
-    tmp = discovery.findcommonincoming(repo, other, heads=revs, force=force)
+def getremotechanges(ui, repo, other, revs=None, bundlename=None,
+                     force=False, usecommon=False):
+    tmp = discovery.findcommonincoming(repo, other, heads=revs, force=force,
+                                       commononly=usecommon)
     common, incoming, rheads = tmp
     if not incoming:
         try:
             os.unlink(bundlename)
         except:
             pass
-        return other, None, None
+        return other, None, None, None
 
     bundle = None
     if bundlename or not other.local():
@@ -303,7 +305,9 @@
         if revs is None and other.capable('changegroupsubset'):
             revs = rheads
 
-        if revs is None:
+        if usecommon:
+            cg = other.getbundle('incoming', common=common, heads=revs)
+        elif revs is None:
             cg = other.changegroup(incoming, "incoming")
         else:
             cg = other.changegroupsubset(incoming, revs, 'incoming')
@@ -315,5 +319,5 @@
         if not other.local():
             # use the created uncompressed bundlerepo
             other = bundlerepository(ui, repo.root, fname)
-    return (other, incoming, bundle)
+    return (other, common, incoming, bundle)