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bug#39489: 28.0.50; On Emacs 27, 28, tramp hangs indefinitely


From: Michael Albinus
Subject: bug#39489: 28.0.50; On Emacs 27, 28, tramp hangs indefinitely
Date: Mon, 10 Feb 2020 10:11:24 +0100
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/28.0.50 (gnu/linux)

Benjamin Slade <address@hidden> writes:

> Hi Michael,

Hi Benjamin,

>> I don't know why `auth-source-search' needs to expand ".". Could it
>> be, that it is part of your `exec-path'?
>
> It turns out my $PATH variable had an 'empty' field
> (e.g. =/usr/local/bin::/home/slade/.guix-profile/bin=),
> eliminating that fixed the tramp issue I described in the bug
> report. (it's interesting that this only manifested was 27+)

An empty entry in $PATH is taken as `default-directory', implemented as
"." in `exec-path'. And this is a problem, if `call-process' searches
for the gpg command, and `default-directory' is remote. I have no idea
why this problem has uncovered in Emacs 27 only, though.

You have fixed it yourself I guess. But since it happens also for other
people, could you pls check whether the appended patch would have
solved it for you, keeping the empty field in your $PATH?

> [There is still an issue with the =em-tramp= package on Emacs 27+,
> which causes a complete lock-up (i.e. C-g won't work), but that
> should likely be a separate bug report.]

Please do.

> best wishes,
>   —Ben

Best regards, Michael.

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