bug#81517: 31.0.90; executable-find on remote buffer fails

Eli Zaretskii [30/Jul  7:29am +03] wrote:
>> Cc: [email protected]
>> Date: Wed, 29 Jul 2026 18:38:54 +0200
>> From: Michael Albinus via "Bug reports for GNU Emacs,
>>  the Swiss army knife of text editors" <[email protected]>
>>
>> Shun-ichi TAHARA <[email protected]> writes:
>>
>> Hi,
>>
>> > After Emacs31.0.90 with Windows, executable-find on remote buffer
>> > returns nil.  Then, for example, save-buffers on remote file using tramp
>> > fails because '(executable-find "pscp")' returns nil; I use "pscp.exe"
>> > derivered from PuTTY and it is expected that the exe file is found by
>> > executable-find.
>> >
>> > I found that tramp added '(exec-suffixes . (""))' to tramp-connection-
>> > local-default-system-variables at tramp-integration.el since Emacs31.
>> > So 'exec-suffixes' is always changed to that value on remote buffer.
>>
>> Yes, this is an undesired side effect of bug#78886.
>>
>> > It harms because suffixes are disabled even when local executables are
>> > required; "pscp.exe" installed in local file systems must be found then.
>> >
>> > I suppose it might be a bug of tramp.
>> > Emacs-31.0.91 has the same problem, also the same with git HEAD.
>>
>> It has been fixed with bug#81280. The fix is in master, not in the
>> emacs-31 branch. It covers also call-process and make-process. Shall we
>> backport it to Emacs 31? Eli, Sean?
>
> Ouch!  I guess we must, since this whole exec-suffixes business is new
> in Emacs 31.
>
> Sean?

We are discussing backporting the change in dcdd76f89e7, right?

I think that is okay to backport -- /if/ it introduces problems, they
are likely to be no worse than what it fixes.

-- 
Sean Whitton