Re: remote restricted bash does not allow hopping?

[Michael Albinus]

Rodrigo Amestica <address@hidden> writes:

> Hi,

Hi Rodrigo,

> I'm trying to enable a one-hop login to a remote network to which I
> need to go first through a ssh login host, which provides only an rbash
> shell and there is no access to standard commands. As far as I can
> tell only 'ssh' command works in that server.
>
> 'exec' is indeed not available in my login server. Is this the
> problem? Is there a local tramp based work around?

Yes, that's the problem. Tramp does not support hops through restricted
shells. I will check, whether I could implement it, somehow.

As workaround, you might try the following patch:

--8<---------------cut here---------------start------------->8---
*** /home/albinus/src/tramp/lisp/tramp-sh.el.~2.76~     2012-07-05 
09:27:50.917640064 +0200
--- /home/albinus/src/tramp/lisp/tramp-sh.el    2012-07-05 09:22:46.917467906 
+0200
***************
*** 4419,4438 ****
                           ?h l-host ?u l-user ?p l-port ?t tmpfile)
                     command
                     (concat
-                     ;; We do not want to see the trailing local
-                     ;; prompt in `start-file-process'.
-                     (unless (memq system-type '(windows-nt)) "exec ")
                      command " "
                      (mapconcat
                       (lambda (x)
                         (setq x (mapcar (lambda (y) (format-spec y spec)) x))
                         (unless (member "" x) (mapconcat 'identity x " ")))
                       login-args " ")
!                     ;; Local shell could be a Windows COMSPEC.  It
!                     ;; doesn't know the ";" syntax, but we must exit
!                     ;; always for `start-file-process'.  "exec" does
!                     ;; not work either.
!                     (if (memq system-type '(windows-nt)) " && exit || exit")))

                    ;; Send the command.
                    (tramp-message vec 3 "Sending command `%s'" command)
--- 4419,4431 ----
                           ?h l-host ?u l-user ?p l-port ?t tmpfile)
                     command
                     (concat
                      command " "
                      (mapconcat
                       (lambda (x)
                         (setq x (mapcar (lambda (y) (format-spec y spec)) x))
                         (unless (member "" x) (mapconcat 'identity x " ")))
                       login-args " ")
!                     " && exit || exit"))

                    ;; Send the command.
                    (tramp-message vec 3 "Sending command `%s'" command)
--8<---------------cut here---------------end--------------->8---

> thanks,
>  Rodrigo

Best regards, Michael.