GNU bug report logs - #39399
tramp depends on unstable details of shell command line processing

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From: Michael Albinus <michael.albinus <at> gmx.de>
To: 内藤 祐一郎 <naito.yuichiro <at> gmail.com>
Cc: 39399 <at> debbugs.gnu.org
Subject: bug#39399: tramp depends on unstable details of shell command line processing
Date: Mon, 27 Jul 2020 20:01:57 +0200

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内藤 祐一郎 <naito.yuichiro <at> gmail.com> writes:

> Hi.

Hi,

> I could find a another way to solve this problem that avoids changing
> ~/.editrc and it's more simple.
> See my patch attached on this mail.
>
> This problem happens on the latest libedit and FreeBSD sh uses Emacs
> edit mode by default.
>
> If libedit runs on edit mode, libedit rewrites line by each control character.
> On '^H', libedit sends line feed and write characters on the line that
> is held in the internal screen buffer of libedit.
>
> If edit mode turns off, line edit works on terminal that is as same as
> previous behavior.
>
> Shell command `set +E` escapes from edit mode in spite of libedit has
> two edit mode (Emacs and Vi). `set +E` disables both of them.
>
> Although libedit has been developed and used by NetBSD, NetBSD doesn’t
> have this problem.
> Because NetBSD sh doesn't use edit mode by default.

Thanks for the report. However, your patch is not applicable in general,
because the "+E" option is not POSIX conform, and it isn't supported by
all shells. I thought already about this when I was fixing bug#39399.

But wait - "set +o emacs +o vi" might give the same effect, and it is
much more supported by shells. And reading the sources, Tramp calls it
already (might have been added by Kai, many years ago). Maybe it is
sufficient to move it earlier in the initialization machinery?

Appended is a patch for Tramp 2.4.4. You might install it from GNU
ELPA. Please check, whether this works for you.

> Yuichiro NAITO
> naito.yuichiro <at> gmail.com

Best regards, Michael.

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