CODEWITHSUNDEEP
emacssshsutramp
P. B.
P. B.

Reputation: 427

In Emacs, how do I use Tramp SSH to edit as a different group ID?

I think what I'm looking for may be a solution similar to multi hop with SSH and su; but instead of su, I have to use sg. The use case is that I have a user on a server, and the user belongs to multiple groups (main group ID group_A, second group ID group_B) for administrative reasons. SELinux Access Control is used so even if a directory is owned by me, but if my main group ID is not right, I will not be able to create files. In an interactive session, I would do chgrp group_B to switch my main group, and a new shell session will be created. If remotely launching a program, I would do ssh foo.com 'sg group_B /path/to/executable'. How do I achieve these effect in Emacs/Tramp?

Upvotes: 1

Views: 266

Answers (1)

P. B.
P. B.

Reputation: 427

I realized that ssh, su, etc. are defined in tramp-methods, which one can customize as follows to add another connection method called sg:

(eval-after-load 'tramp
  '(add-to-list
    'tramp-methods
    '("sg"
      (tramp-login-program "sg")
      (tramp-login-args (("-") ("%u")))
      (tramp-remote-shell "/bin/sh")
      (tramp-remote-shell-args ("-c")))))

Then one can do

C-x C-f /ssh:myuser@remotehost|sg:group_B@remotehost:/path/to/file

to connect through multi-hops to remotehost as myuser using ssh and then switch main group from group_A to group_B using sg.

Upvotes: 2

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