diff -r 3b6b1b407e99 -r 78a60daacea8 mercurial/subrepo.py
--- a/mercurial/subrepo.py	Tue Mar 11 18:32:16 2014 -0500
+++ b/mercurial/subrepo.py	Wed May 07 00:08:20 2014 +0200
@@ -501,6 +501,9 @@
             % (substate[0], substate[2]))
         return []
 
+    def shortid(self, revid):
+        return revid
+
 class hgsubrepo(abstractsubrepo):
     def __init__(self, ctx, path, state):
         self._path = path
@@ -866,6 +869,9 @@
             pats = []
         cmdutil.revert(ui, self._repo, ctx, parents, *pats, **opts)
 
+    def shortid(self, revid):
+        return revid[:12]
+
 class svnsubrepo(abstractsubrepo):
     def __init__(self, ctx, path, state):
         self._path = path
@@ -1561,6 +1567,9 @@
         deleted = unknown = ignored = clean = []
         return modified, added, removed, deleted, unknown, ignored, clean
 
+    def shortid(self, revid):
+        return revid[:7]
+
 types = {
     'hg': hgsubrepo,
     'svn': svnsubrepo,