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Environment variables for remote processes (was: bug#18940: 24.4; vc-hg
From: |
Michael Albinus |
Subject: |
Environment variables for remote processes (was: bug#18940: 24.4; vc-hg does not disable pager, leading to hangs (at least with tramp)) |
Date: |
Mon, 17 Nov 2014 19:48:02 +0100 |
User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/25.0.50 (gnu/linux) |
Stefan Monnier <address@hidden> writes:
>> Maybe I'm missing something, but what's wrong with let-binding
>> process-environment?
>
> Nothing wrong with it. The problem is that Tramp ignores those
> let-bindings because it fails to propagate this environment to its
> remote sub-processed.
The problem is, that not all settings of process-environment might be
desired on remote hosts. process-environment keeps *local* variables.
Furthermore, some remote settings might be requested which are not in
process-environment by default. A user shall not be responsible for
those settings; that's why there is tramp-remote-process-environment.
But this is also not satisfactory, because there might be even different
settings required for different hosts.
> `tramp-sh-handle-process-file' really needs to compare
> process-environment with (default-toplevel-value 'process-environment)
> to infer the env-vars that have been added via let-binding and then
> propagate those to the remote sub-process.
tramp-sh-handle-process-file does not start a new process, it reuses the
existing one. The propagation to the remote sub-process must ensure,
that those settings are not permanent. Via a subshell, or alike.
It's not that easy as it looks at first glance. That's why I would like
a kind of design, before starting to implement.
> Stefan
Best regards, Michael.
- Environment variables for remote processes (was: bug#18940: 24.4; vc-hg does not disable pager, leading to hangs (at least with tramp)),
Michael Albinus <=
- Re: Environment variables for remote processes, Stefan Monnier, 2014/11/17
- Re: Environment variables for remote processes, Michael Albinus, 2014/11/18
- Re: Environment variables for remote processes, Stefan Monnier, 2014/11/18
- Re: Environment variables for remote processes, Michael Albinus, 2014/11/18
- Re: Environment variables for remote processes, Stefan Monnier, 2014/11/18
- Re: Environment variables for remote processes, andres . ramirez, 2014/11/19
- Re: Environment variables for remote processes, Michael Albinus, 2014/11/23
- Re: Environment variables for remote processes, Michael Albinus, 2014/11/19
- Re: Environment variables for remote processes, Michael Albinus, 2014/11/19
- Re: Environment variables for remote processes, Stefan Monnier, 2014/11/19