Yeah, I haven't tried automating tramp much before so I'm not super familiar with what best practice is here. I'm on 29.1.
Joseph Garvin <k04jg02@gmail.com> writes:
Hi Joseph,
> I originally posted this on the emacs stack exchange
> (https://emacs.stackexchange.com/questions/78768/reopen-with-sudo-command-that-works-through-tramp)
> but they suggested I try here.
>
> I have tried to define this command:
>
> ```
> (defun etc-reopen-with-sudo ()
> (interactive)
> (let* ((vec (tramp-dissect-file-name (buffer-file-name
> (current-buffer))))
> (method (tramp-file-name-method vec))
> (user (tramp-file-name-user vec))
> (host (tramp-file-name-host vec))
> (localname (tramp-file-name-localname vec)))
> (message "localname=%s" localname)
> (find-alternate-file
> (if (tramp-tramp-file-p (buffer-file-name (current-buffer)))
> (concat (format "/%s:%s@%s|sudo::%s" method user host
> localname))
> (concat "/sudo:root@localhost:" buffer-file-name)))))
> ```
>
> It worked once... and now ever since mysteriously hangs whenever I try
> to use it to open a file with sudo on a remote host with ssh. The idea
> for what file string to use for this comes from
> https://stackoverflow.com/questions/2177687/open-file-via-ssh-and-sudo-with-emacs
> which suggests `/ssh:you@remotehost|sudo:remotehost:/path/to/file`
> should work. I'm able to visit files on the host just fine without
> sudo. Any ideas what I'm doing wrong here?
Well, your function has some flaws. For example, it doesn't handle the
case there's no user in the buffer-file-name, like in
"/ssh:remotehost:/path/to/file". Furthermore, you use the "sudo::"
construct in the second hop, which works reliably since Tramp 2.4 (Emacs
27.1) only. Which versions do you use?
Best regards, Michael.