--- a/mercurial/posix.py	Wed Jan 06 21:11:58 2010 +0100
+++ b/mercurial/posix.py	Wed Jan 06 21:11:58 2010 +0100
@@ -262,3 +262,5 @@
     return os.spawnvp(os.P_NOWAIT | getattr(os, 'P_DETACH', 0),
                       args[0], args)
 
+def gethgcmd():
+    return sys.argv[:1]