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tramp-container doesn't follow `ENV PATH` in docker file

From: ParetoOptimalDev
Subject: tramp-container doesn't follow `ENV PATH` in docker file
Date: Tue, 14 Mar 2023 19:11:36 -0500
User-agent: Gnus/5.13 (Gnus v5.13)

Hi, all. I'm having some issues with using docker container and have an
idea for improving it.

Firstly, I'm familiar with
and `tramp-own-remote-path`, but they aren't sufficient for seamlessly
dropping into a docker container and using binaries inside of it.

Here's an example with emacs 30 using `emacs -Q`. First the code:

(require 'tramp)
(message "")

(message "using the docker haskell image")
(message (concat "path should be: 

(message "show that using tramp-own-remote-path isn't sufficient")
(let ((docker-container-id (string-trim (shell-command-to-string "docker run 
-it --rm --detach haskell"))))
  (let ((default-directory (concat "/docker:" docker-container-id ":"))
        (tramp-remote-path '(tramp-own-remote-path)))
        (message docker-container-id)
        (message (concat "path is: " (truncate-string-to-width 
(eshell-command-result "echo $PATH") 100)))))

Here are it's results:

using the docker haskell image
path should be: 
show that using tramp-own-remote-path isn’t sufficient
Tramp: Opening connection nil for 
69ae6adb42d95fd9ebef5738218217d822ee2977956b61227b43eb8ccb1401d4 using 
path is: /usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin

This means that when you:

- open eshell
- navigate to
- `/docker:69ae6adb42d95fd9ebef5738218217d822ee2977956b61227b43eb8ccb1401d4:`
- run `ghc`

You'll be met with an error that `ghc` doesn't exist in the Haskell
docker container.

It seems that the typical way for docker containers to specify PATH uses
`ENV PATH` so it seems good to support it (if that's not already

I noticed when using docker inspect on the container that it contains
the PATH set by the docker file.

Perhaps tramp could simply use that for the docker container method?


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