TRAMP and umask (and git)

TRAMP and umask (and git)

[akater]

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I work with a git repository via TRAMP (and magit, but that doesn't seem
to be important).  Repository's owner is user x, and x's umask is 022.
All operations on the repository are done via /sudo:x@.../ My umask,
however, is 077.  I can't make Emacs use a umask that would be
appropriate to the context.  It seems to always use a global umask.

I searched the mailing list, found this thread
https://lists.gnu.org/archive/html/help-gnu-emacs/2016-06/msg00214.html
It resolves with the recommendation to use
tramp-handle-write-region-hook.  With git repository, this won't help as
operations are performed by git.  E.g. a rebase messes up everything.

There is another suggestion there that recommends to alter x's .profile
and set umask depending on a value passed via
tramp-remote-process-environment.  I just altered x's .profile to set
umask *unconditionally*, and it has no effect.  So far, the way Tramp
treats umask makes absolutely no sense to me.

What are my options?

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Re: TRAMP and umask (and git)

[Michael Albinus]

akater <nuclearspace@gmail.com> writes:

Hi,

> There is another suggestion there that recommends to alter x's .profile
> and set umask depending on a value passed via
> tramp-remote-process-environment.  I just altered x's .profile to set
> umask *unconditionally*, and it has no effect.

sudo requires an additional "-i" argument in order to to run the shell
as login shell, reading ~/.profile. So you must teach the "sudo" entry
in tramp-methods to add this argument, via tramp-login-args.

Furthermore, if x's remote shell is bash or zsh, Tramp tries to avoid
reading ~/.profile. See tramp-sh-extra-args.

Best regards, Michael.

Re: TRAMP and umask (and git)

[Emanuel Berg via Users list for the GNU Emacs text editor]

Michael Albinus wrote:

>> There is another suggestion there that recommends to alter
>> x's .profile and set umask depending on a value passed via
>> tramp-remote-process-environment. I just altered x's
>> .profile to set umask *unconditionally*, and it has
>> no effect.
>
> sudo requires an additional "-i" argument in order to to run
> the shell as login shell, reading ~/.profile. So you must
> teach the "sudo" entry in tramp-methods to add this
> argument, via tramp-login-args.
>
> Furthermore, if x's remote shell is bash or zsh, Tramp tries
> to avoid reading ~/.profile. See tramp-sh-extra-args.

Tramp... zsh... this rings a bell. No, actually the bell rings
clear, it was rather that when we finally got it to work, we
had tried so many things conclusions were... inconclusive
at best.

I don't even remember if it was indeed zsh, or my remote SunOS
and OpenBSD, that caused the trouble. They are trouble spot
OSs, right?

Anyway I yank the file, maybe Mr. Albinus can have a second
look and detect what was going on :) Maybe it can help the OP
as well.

Anyway it works great, thanks again :) "Hooray!"

;;; -*- lexical-binding: t -*-
;;;
;;; this file:
;;;   http://user.it.uu.se/~embe8573/emacs-init/tramp-incal.el
;;;   https://dataswamp.org/~incal/emacs-init/tramp-incal.el

(require 'tramp)

(setq tramp-histfile-override nil)

(add-to-list 'tramp-methods
  '("sunos-ssh"
    (tramp-login-program "ssh")
    (tramp-login-args (("-l" "%u")
                       ("-p" "%p")
                       ("%c")
                       ("-e" "none")
                       ("-t" "-t")
                       ("%h")
                       ("\"/bin/sh -i\"") ))
    (tramp-async-args (("-q")))
    (tramp-remote-shell "/bin/sh")
    (tramp-remote-shell-login ("-l"))
    (tramp-remote-shell-args  ("-c"))
    ))

;; SunOS system:
;; (find-file "/sunos-ssh:embe8573@polhem.it.uu.se:public_html/darn.txt")
;;
;; OpenBSD system:
;; (find-file "/-:incal@srv.dataswamp.org:public_html/bot/sth.py")

-- 
underground experts united
https://dataswamp.org/~incal

Re: TRAMP and umask (and git)

[akater]

Michael Albinus <michael.albinus@gmx.de> writes:

> sudo requires an additional "-i" argument in order to to run the shell
> as login shell, reading ~/.profile. So you must teach the "sudo" entry
> in tramp-methods to add this argument, via tramp-login-args.

I've had it for some time (I wonder why it's not built-in), and tried it
but it didn't work for this particular user.  I ended up used a
workaround but thank you anyway.  At least I now know it's possible to
use different umasks from a single Emacs process.