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bug#23779: 25.0.95; consing "SHELLVAR" onto process-environment doesn't
From: |
Eli Zaretskii |
Subject: |
bug#23779: 25.0.95; consing "SHELLVAR" onto process-environment doesn't remove it from subprocess env |
Date: |
Fri, 17 Jun 2016 10:11:58 +0300 |
> From: Noam Postavsky <npostavs@users.sourceforge.net>
> Date: Thu, 16 Jun 2016 23:33:02 -0400
>
> (check-env-var "SHELL");=>"SHELL=/bin/bash"
> (let ((process-environment (copy-sequence process-environment)))
> (setenv "SHELL" nil)
> (check-env-var "SHELL"));=>nil
> (let ((process-environment (cons "SHELL" process-environment)))
> (check-env-var "SHELL"));=>"SHELL=/bin/bash"
> (let ((process-environment (cons "SHELL=" process-environment)))
> (check-env-var "SHELL"));=>"SHELL="
>
> As you can see from the 3rd expression, contrary to its docstring,
> consing the env variable "SHELL" onto process-environment has no
> effect at all.
>
> process-environment is a variable defined in ‘C source code’.
> Its value is
> [...]
> Documentation:
> List of overridden environment variables for subprocesses to inherit.
> Each element should be a string of the form ENVVARNAME=VALUE.
>
> Entries in this list take precedence to those in the frame-local
> environments. Therefore, let-binding ‘process-environment’ is an easy
> way to temporarily change the value of an environment variable,
> irrespective of where it comes from. To use ‘process-environment’ to
> remove an environment variable, include only its name in the list,
> without "=VALUE".
Where does it say that you can use 'cons' or 'push', and only them, to
the effect of removing the variable from the environment passed to
child processes? process-environment is just a simple list, so these
two functions just _add_ another member to the list, they don't remove
the old member.
My reading of the last sentence you cite is that you must manually
remove the old member "SHELL=whatever", and _then_ add a member that
has no value.
Am I missing something?
- bug#23779: 25.0.95; consing "SHELLVAR" onto process-environment doesn't remove it from subprocess env, Noam Postavsky, 2016/06/16
- bug#23779: 25.0.95; consing "SHELLVAR" onto process-environment doesn't remove it from subprocess env,
Eli Zaretskii <=
- bug#23779: 25.0.95; consing "SHELLVAR" onto process-environment doesn't remove it from subprocess env, Dmitry Gutov, 2016/06/17
- bug#23779: 25.0.95; consing "SHELLVAR" onto process-environment doesn't remove it from subprocess env, Eli Zaretskii, 2016/06/17
- bug#23779: 25.0.95; consing "SHELLVAR" onto process-environment doesn't remove it from subprocess env, Dmitry Gutov, 2016/06/17
- bug#23779: 25.0.95; consing "SHELLVAR" onto process-environment doesn't remove it from subprocess env, Eli Zaretskii, 2016/06/17
- bug#23779: 25.0.95; consing "SHELLVAR" onto process-environment doesn't remove it from subprocess env, Dmitry Gutov, 2016/06/17
- bug#23779: 25.0.95; consing "SHELLVAR" onto process-environment doesn't remove it from subprocess env, Andreas Schwab, 2016/06/17
- bug#23779: 25.0.95; consing "SHELLVAR" onto process-environment doesn't remove it from subprocess env, Dmitry Gutov, 2016/06/17
- bug#23779: 25.0.95; consing "SHELLVAR" onto process-environment doesn't remove it from subprocess env, Eli Zaretskii, 2016/06/17
- bug#23779: 25.0.95; consing "SHELLVAR" onto process-environment doesn't remove it from subprocess env, Dmitry Gutov, 2016/06/17
- bug#23779: 25.0.95; consing "SHELLVAR" onto process-environment doesn't remove it from subprocess env, Eli Zaretskii, 2016/06/17