diff -r b061a2049662 -r 457e26da029b mercurial/exchange.py
--- a/mercurial/exchange.py	Wed Apr 15 18:34:34 2015 -0400
+++ b/mercurial/exchange.py	Sat Apr 11 13:58:36 2015 -0400
@@ -1282,7 +1282,7 @@
         # push can proceed
         if util.safehasattr(cg, 'params'):
             try:
-                tr = repo.transaction('unbundle')
+                tr = repo.transaction(source)
                 tr.hookargs['source'] = source
                 tr.hookargs['url'] = url
                 tr.hookargs['bundle2'] = '1'