* eshell/em-unix.el (eshell/sudo): When we have an ad-hoc

remote definition of `default-directory', ensure we can connect.

lisp/ChangeLog

+2012-09-02  Michael Albinus  <michael.albinus@gmx.de>
+
+	* eshell/em-unix.el (eshell/sudo): When we have an ad-hoc
+	remote definition of `default-directory', ensure we can connect.
+
 2012-09-02  Juri Linkov  <juri@jurta.org>
 	Toggle whitespace matching mode with M-s SPC.

lisp/eshell/em-unix.el

@@ -1110,6 +1110,8 @@ Execute a COMMAND as the superuser or another USER.")
 			  (format "%s|sudo:%s@%s:%s"
 				  (substring prefix 0 -1) user host dir)
 			(format "/sudo:%s@%s:%s" user host dir))))
+		;; Ensure, that Tramp has connected to that construct already.
+		(file-exists-p default-directory)
 		(eshell-named-command (car orig-args) (cdr orig-args))))))))
 
 (put 'eshell/sudo 'eshell-no-numeric-conversions t)