GNU bug report logs - #79413
[PATCH] Fix path and environment in remote Python shell

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From: Michael Albinus <michael.albinus <at> gmx.de>
To: Liu Hui <liuhui1610 <at> gmail.com>
Cc: 79413 <at> debbugs.gnu.org
Subject: bug#79413: [PATCH] Fix path and environment in remote Python shell
Date: Tue, 09 Sep 2025 15:01:18 +0200

Liu Hui <liuhui1610 <at> gmail.com> writes:

Hi,

> There is still a corner case: if python-shell-process-environment
> contains an environment variable that already exists in the default
> process-environment, the environment variable is not applied by tramp
> for the remote Python shell. For example, the following test fails:
>
> FOO=1 REMOTE_TEMPORARY_FILE_DIRECTORY=/ssh:remote:/tmp/ \
>   make python-tests SELECTOR='"python-tests-remote-env"'
>
> where FOO=1 is in both python-shell-process-environment and default
> process-environment. This issue may need to be addressed in tramp.

This is a Tramp feature. See this comment in tramp-handle-make-process,
tramp-sh-handle-make-process and tramp-sh-handle-process-file:

--8<---------------cut here---------------start------------->8---
	   ;; We use as environment the difference to toplevel
	   ;; `process-environment'.
--8<---------------cut here---------------end--------------->8---

The reason is, that often a local value of $FOO might be wrong on the
remote host.

Best regards, Michael.

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