bug#49723: 28.0.50; Test in coding.c for NUL bytes in filenames is not reliable

[Eli Zaretskii]

> From: Michael Albinus <michael.albinus@gmx.de>
> Cc: federicotedin@gmail.com,  phst@google.com,  49723@debbugs.gnu.org
> Date: Thu, 16 Sep 2021 20:44:32 +0200
> 
> >> Should this be implemented also in remote file names?
> >
> > Are we sure remote file names cannot include null bytes?
> 
> Likely not. I have added "foo\0bar" as file name in tramp-test.el, and
> then I get
> 
> --8<---------------cut here---------------start------------->8---
> Test tramp-test41-special-characters condition:
>     (ert-test-failed
>      ((should
>        (file-exists-p file1))
>       :form
>       (file-exists-p "/mock:gandalf:/tmp/tramp-testkLeKOx/foo\0bar")
>       :value nil))
>    FAILED  1/1  tramp-test41-special-characters (0.484141 sec)
> 
> --8<---------------cut here---------------end--------------->8---
> 
> Well, perhaps Tramp can be improved to handle null bytes on (remote)
> shell level, but do we need this?

I'm not sure.