diff -r c1ae0b2c1719 -r 5ba11ab48fcf mercurial/ui.py
--- a/mercurial/ui.py	Sat Oct 18 18:14:48 2014 -0500
+++ b/mercurial/ui.py	Tue Oct 21 23:16:46 2014 +0900
@@ -711,11 +711,7 @@
             r = self._readline(self.label(msg, 'ui.prompt'))
             if not r:
                 r = default
-            # sometimes self.interactive disagrees with isatty,
-            # show response provided on stdin when simulating
-            # but commandserver
-            if (not util.isatty(self.fin)
-                and not self.configbool('ui', 'nontty')):
+            if self.configbool('ui', 'promptecho'):
                 self.write(r, "\n")
             return r
         except EOFError: