how to customize shell prompt (for emacs tramp compatibility)

how to customize shell prompt (for emacs tramp compatibility)

[Giovanni Biscuolo]

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Hi,

I'm having problems to remotely browse my guixsd testing host using
emacs dired via tramp, the exact error message I get is:

--8<---------------cut here---------------start------------->8---
tramp-file-name-handler: Couldn’t find a proper ‘ls’ command
--8<---------------cut here---------------end--------------->8---

I found this explanation on stackexchange
https://stackoverflow.com/questions/6954479/emacs-tramp-doesnt-work/8363532#8363532

actually PS1 is \u@\h \w\$, it should be \u@\h:\w\$ to be "tramp
compatible"

please is there a way to declaratively customize user prompts in
config.scm or similar?

should that "unusual" prompt considered a bug to be fixed? [1]

best regards
Gio


[1] I'm going where it's defined and try to propose a patch in guix-devel


-- 
Giovanni Biscuolo

Xelera IT Infrastructures

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Re: how to customize shell prompt (for emacs tramp compatibility)

[George Clemmer]

Giovanni Biscuolo <g@xelera.eu> writes:

> I'm having problems to remotely browse my guixsd testing host using
> emacs dired via tramp, the exact error message I get is:
>
> --8<---------------cut here---------------start------------->8---
> tramp-file-name-handler: Couldn’t find a proper ‘ls’ command
> --8<---------------cut here---------------end--------------->8---

FWIW, on macOS running GNU Emacs 26.1 from brew I load this once ...

--8<---------------cut here---------------start------------->8---
;; Make tramp work from macOS to GuixSD
(require 'tramp)
(setq tramp-remote-path
      (append tramp-remote-path
	      '(tramp-own-remote-path)))
(setq tramp-remote-path
      (append tramp-remote-path
	      '("~/.guix-profile/bin" "~/.guix-profile/sbin"
		"/run/current-system/profile/bin" "/run/current-system/profile/sbin")))
--8<---------------cut here---------------end--------------->8---

The net effect ends up cached on the mac in ~/.emacs.d/tramp ...

--8<---------------cut here---------------start------------->8---
;; -*- emacs-lisp -*-
;; Tramp connection history.  Don't change this file.
;; You can delete it, forcing Tramp to reapply the checks.

(((tramp-file-name "ssh" "glc" nil "g1" nil nil nil)
  ("uname" "Linux 4.19.0-gnu")
  ("locale" "LC_ALL=C")
  ("test" "test")
  ("remote-path"
   ("/bin"))
  ("remote-shell" "/bin/sh")
  ("~" "/home/glc")
  ("file-exists" "test -e")
  ("case-insensitive" nil)
  ("ls" "/run/current-system/profile/bin/ls --color=never")
  ("ls-quoting-style" t)
  ("ls-dired" t)
  ("stat" nil)
  ("perl" nil)
  ("id" "/run/current-system/profile/bin/id")
  ("gid-integer" 998)))
--8<---------------cut here---------------end--------------->8---

... after which tramp works fine.

HTH - George

Re: how to customize shell prompt (for emacs tramp compatibility)

[Giovanni Biscuolo]

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Hi!

George Clemmer <myglc2@gmail.com> writes:

[...]

> --8<---------------cut here---------------start------------->8---
> ;; Make tramp work from macOS to GuixSD
> (require 'tramp)
> (setq tramp-remote-path
>       (append tramp-remote-path
> 	      '(tramp-own-remote-path)))
> (setq tramp-remote-path
>       (append tramp-remote-path
> 	      '("~/.guix-profile/bin" "~/.guix-profile/sbin"
> 		"/run/current-system/profile/bin" "/run/current-system/profile/sbin")))
> --8<---------------cut here---------------end--------------->8---

great, it worked! (I'm on Debian, so it's cross OS ;-) )

> The net effect ends up cached on the mac in ~/.emacs.d/tramp ...
>
> --8<---------------cut here---------------start------------->8---

[...]

>   ("ls" "/run/current-system/profile/bin/ls --color=never")

[...]

> --8<---------------cut here---------------end--------------->8---

the same here: with the above tramp-remote-path definition, it found a
proper ls on the remote guix(SD) host

thank you very much!
happy hacking!
Gio

P.S.: from an "old school" sysadmin with FHS printed in every neuron,
guix is a mind blowing and refreshing experience :-)

-- 
Giovanni Biscuolo

Xelera IT Infrastructures

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