diff -r d051db8e9e44 -r c63c336ee2f7 mercurial/ui.py
--- a/mercurial/ui.py	Mon Oct 19 23:27:20 2009 +0300
+++ b/mercurial/ui.py	Tue Oct 20 00:17:36 2009 +0200
@@ -179,7 +179,7 @@
             user = os.environ.get("EMAIL")
         if user is None and self.configbool("ui", "askusername"):
             user = self.prompt(_("enter a commit username:"), default=None)
-        if user is None:
+        if user is None and not self.interactive():
             try:
                 user = '%s@%s' % (util.getuser(), socket.getfqdn())
                 self.warn(_("No username found, using '%s' instead\n") % user)