diff -r a039e1f2326f -r 75a96326cecb mercurial/cmdutil.py
--- a/mercurial/cmdutil.py	Sun May 04 18:45:04 2014 -0700
+++ b/mercurial/cmdutil.py	Sun May 04 20:58:25 2014 -0700
@@ -2489,14 +2489,23 @@
 
     The synopsis argument defines a short, one line summary of how to use the
     command. This shows up in the help output.
+
+    The norepo argument defines whether the command does not require a
+    local repository. Most commands operate against a repository, thus the
+    default is False.
     """
-
-    def cmd(name, options=(), synopsis=None):
+    def cmd(name, options=(), synopsis=None, norepo=False):
         def decorator(func):
             if synopsis:
                 table[name] = func, list(options), synopsis
             else:
                 table[name] = func, list(options)
+
+            if norepo:
+                # Avoid import cycle.
+                import commands
+                commands.norepo += ' %s' % ' '.join(parsealiases(name))
+
             return func
         return decorator