diff --git a/mercurial/repair.py b/mercurial/repair.py
--- a/mercurial/repair.py
+++ b/mercurial/repair.py
@@ -9,7 +9,6 @@
 from mercurial import changegroup
 from mercurial.node import short
 from mercurial.i18n import _
-import os
 import errno
 
 def _bundle(repo, bases, heads, node, suffix, compress=True):
@@ -24,7 +23,7 @@ def _bundle(repo, bases, heads, node, su
         bundletype = "HG10BZ"
     else:
         bundletype = "HG10UN"
-    return vfs.join(changegroup.writebundle(cg, name, bundletype, vfs))
+    return changegroup.writebundle(cg, name, bundletype, vfs)
 
 def _collectfiles(repo, striprev):
     """find out the filelogs affected by the strip"""
@@ -109,10 +108,13 @@ def strip(ui, repo, nodelist, backup="al
 
     # create a changegroup for all the branches we need to keep
     backupfile = None
+    vfs = repo.vfs
     if backup == "all":
         backupfile = _bundle(repo, stripbases, cl.heads(), node, topic)
-        repo.ui.status(_("saved backup bundle to %s\n") % backupfile)
-        repo.ui.log("backupbundle", "saved backup bundle to %s\n", backupfile)
+        repo.ui.status(_("saved backup bundle to %s\n") %
+                       vfs.join(backupfile))
+        repo.ui.log("backupbundle", "saved backup bundle to %s\n",
+                    vfs.join(backupfile))
     if saveheads or savebases:
         # do not compress partial bundle if we remove it from disk later
         chgrpfile = _bundle(repo, savebases, saveheads, node, 'temp',
@@ -144,18 +146,18 @@ def strip(ui, repo, nodelist, backup="al
 
         if saveheads or savebases:
             ui.note(_("adding branch\n"))
-            f = open(chgrpfile, "rb")
-            gen = changegroup.readbundle(f, chgrpfile)
+            f = vfs.open(chgrpfile, "rb")
+            gen = changegroup.readbundle(f, chgrpfile, vfs)
             if not repo.ui.verbose:
                 # silence internal shuffling chatter
                 repo.ui.pushbuffer()
             changegroup.addchangegroup(repo, gen, 'strip',
-                                       'bundle:' + chgrpfile, True)
+                                       'bundle:' + vfs.join(chgrpfile), True)
             if not repo.ui.verbose:
                 repo.ui.popbuffer()
             f.close()
             if not keeppartialbundle:
-                os.unlink(chgrpfile)
+                vfs.unlink(chgrpfile)
 
         # remove undo files
         for undovfs, undofile in repo.undofiles():
@@ -172,10 +174,10 @@ def strip(ui, repo, nodelist, backup="al
     except: # re-raises
         if backupfile:
             ui.warn(_("strip failed, full bundle stored in '%s'\n")
-                    % backupfile)
+                    % vfs.join(backupfile))
         elif saveheads:
             ui.warn(_("strip failed, partial bundle stored in '%s'\n")
-                    % chgrpfile)
+                    % vfs.join(chgrpfile))
         raise
 
     repo.destroyed()