How can I use Emacs tramp to ssh to a remote host and edit a file as another user on an ad-hoc basis?

Question

/multi used to work for me, now it's gone and I'm frustrated.

What I want to do is, in my dream world:

/myuser@remotehost:sudo:anotheruser:/some/path/to/file

...and have ido-mode work.

The key thing here is that 'myuser', 'remotehost' and 'anotheruser' are all very ad-hoc, I use a huge array of remote hosts, often with different users and sudo-ing to a wide range of different users.

What do I need to add and how can I test it without reloading emacs over and over?

Could you be more precise: did you use tramp-completion-function-alist? What's your configuration? Maybe the following post may help you: stackoverflow.com/questions/95631/… — Renaud
– Renaud, Commented Oct 22, 2011 at 0:01
This thread gives the full background: lists.gnu.org/archive/html/tramp-devel/2011-10/msg00014.html — Chris Withers
– Chris Withers, Commented Oct 29, 2011 at 7:42

itsjeyd · Accepted Answer · 2015-02-22 23:16:56Z

10

As of this commit, TRAMP supports ad-hoc multiple hops again.

Roughly speaking, you use it like this:

/ssh:transituser@remotehost|sudo:user@remotehost:/some/file

I haven't got it to work reliably with ido-mode yet, which is a shame, but it's a lot better than nothing! :-)

edited Feb 22, 2015 at 23:16

itsjeyd

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answered Oct 8, 2012 at 7:00

Chris Withers

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2 Comments

phils Over a year ago

Included in Emacs 24, for anyone wondering. See also stackoverflow.com/a/16408592/324105

mike Over a year ago

Confirmed this worked for me on Emacs 24.3, no special configurations needed. A point of clarification: If your <remotehost> is an alias defined in ~/.ssh/config (with Host), then use your local alias for <remotehost> in both places -- you don't need to translate to the true hostname for the sudo. You can also use this for dired/dired+ to open remote directories and eshell.

stevejb · Accepted Answer · 2011-12-19 19:32:14Z

The following code may help:

  (defun find-file-as-root ()
    "Find a file as root."
    (interactive)
    (let* ((parsed (when (tramp-tramp-file-p default-directory)
                     (coerce (tramp-dissect-file-name default-directory)
                             'list)))
           (default-directory
             (if parsed
                 (apply 'tramp-make-tramp-file-name
                        (append '("sudo" "root") (cddr parsed)))
               (tramp-make-tramp-file-name "sudo" "root" "localhost"
                                           default-directory))))
      (call-interactively 'find-file)))

I had it in my .emacs file, and it seems to come from here: http://atomized.org/2011/01/toggle-between-root-non-root-in-emacs-with-tramp/

I haven't used it extensively but it seems like that is a step in the right direction.

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