diff --git a/hgext/shelve.py b/hgext/shelve.py
--- a/hgext/shelve.py
+++ b/hgext/shelve.py
@@ -43,6 +43,7 @@ class shelvedfile(object):
         self.repo = repo
         self.name = name
         self.vfs = scmutil.vfs(repo.join('shelved'))
+        self.ui = self.repo.ui
         if filetype:
             self.fname = name + '.' + filetype
         else:
@@ -82,7 +83,7 @@ class shelvedfile(object):
         return bundlerepo.bundlerepository(self.repo.baseui, self.repo.root,
                                            self.vfs.join(self.fname))
     def writebundle(self, cg):
-        changegroup.writebundle(cg, self.fname, 'HG10UN', self.vfs)
+        changegroup.writebundle(self.ui, cg, self.fname, 'HG10UN', self.vfs)
 
 class shelvedstate(object):
     """Handle persistence during unshelving operations.
diff --git a/mercurial/bundlerepo.py b/mercurial/bundlerepo.py
--- a/mercurial/bundlerepo.py
+++ b/mercurial/bundlerepo.py
@@ -410,7 +410,7 @@ def getremotechanges(ui, repo, other, on
         else:
             cg = other.changegroupsubset(incoming, rheads, 'incoming')
         bundletype = localrepo and "HG10BZ" or "HG10UN"
-        fname = bundle = changegroup.writebundle(cg, bundlename, bundletype)
+        fname = bundle = changegroup.writebundle(ui, cg, bundlename, bundletype)
         # keep written bundle?
         if bundlename:
             bundle = None
diff --git a/mercurial/changegroup.py b/mercurial/changegroup.py
--- a/mercurial/changegroup.py
+++ b/mercurial/changegroup.py
@@ -79,7 +79,7 @@ bundletypes = {
 # hgweb uses this list to communicate its preferred type
 bundlepriority = ['HG10GZ', 'HG10BZ', 'HG10UN']
 
-def writebundle(cg, filename, bundletype, vfs=None):
+def writebundle(ui, cg, filename, bundletype, vfs=None):
     """Write a bundle file and return its filename.
 
     Existing files will not be overwritten.
diff --git a/mercurial/commands.py b/mercurial/commands.py
--- a/mercurial/commands.py
+++ b/mercurial/commands.py
@@ -1217,7 +1217,7 @@ def bundle(ui, repo, fname, dest=None, *
         scmutil.nochangesfound(ui, repo, outgoing and outgoing.excluded)
         return 1
 
-    changegroup.writebundle(cg, fname, bundletype)
+    changegroup.writebundle(ui, cg, fname, bundletype)
 
 @command('cat',
     [('o', 'output', '',
@@ -2165,7 +2165,7 @@ def debuggetbundle(ui, repopath, bundlep
     bundletype = btypes.get(bundletype)
     if bundletype not in changegroup.bundletypes:
         raise util.Abort(_('unknown bundle type specified with --type'))
-    changegroup.writebundle(bundle, bundlepath, bundletype)
+    changegroup.writebundle(ui, bundle, bundlepath, bundletype)
 
 @command('debugignore', [], '')
 def debugignore(ui, repo, *values, **opts):
diff --git a/mercurial/httppeer.py b/mercurial/httppeer.py
--- a/mercurial/httppeer.py
+++ b/mercurial/httppeer.py
@@ -193,7 +193,7 @@ class httppeer(wireproto.wirepeer):
                 type = x
                 break
 
-        tempname = changegroup.writebundle(cg, None, type)
+        tempname = changegroup.writebundle(self.ui, cg, None, type)
         fp = httpconnection.httpsendfile(self.ui, tempname, "rb")
         headers = {'Content-Type': 'application/mercurial-0.1'}
 
diff --git a/mercurial/repair.py b/mercurial/repair.py
--- a/mercurial/repair.py
+++ b/mercurial/repair.py
@@ -31,7 +31,7 @@ def _bundle(repo, bases, heads, node, su
         bundletype = "HG10BZ"
     else:
         bundletype = "HG10UN"
-    return changegroup.writebundle(cg, name, bundletype, vfs)
+    return changegroup.writebundle(repo.ui, cg, name, bundletype, vfs)
 
 def _collectfiles(repo, striprev):
     """find out the filelogs affected by the strip"""