Debian Bug report logs - #913237
xterm: exec-formatted sends an ending bracketed-paste sequence to the application (when enabled)

version graph

Package: xterm; Maintainer for xterm is Debian X Strike Force <[email protected]>; Source for xterm is src:xterm (PTS, buildd, popcon).

Reported by: Vincent Lefevre <[email protected]>

Date: Thu, 8 Nov 2018 15:54:01 UTC

Severity: normal

Tags: patch, upstream

Found in version xterm/337-1

Fixed in version xterm/338-1

Done: Sven Joachim <[email protected]>

Bug is archived. No further changes may be made.

Full log

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Date: Tue, 4 Dec 2018 21:50:47 -0500
From: Thomas Dickey <[email protected]>
To: [email protected]
Cc: [email protected]
Subject: Re: Bug#913237: xterm: exec-formatted yields a tilde character in
 zsh and emacs
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[Message part 1 (text/plain, inline)]
On Tue, Nov 27, 2018 at 09:56:15AM +0100, Vincent Lefevre wrote:
> On 2018-11-26 20:38:37 -0500, Thomas Dickey wrote:
> > On Sun, Nov 25, 2018 at 12:08:03AM +0100, Vincent Lefevre wrote:
> > > With zsh, one can reproduce the issue with:
> > > 
> > > $ xterm -e zsh -f
> > 
> > If you added a "-l" option, that would turn on xterm's logging feature
> > 
> > 	xterm -l -e zsh -f
> > 
> > which could be interesting.
> 
> Here's what the log file gives (output with hd):
> 
> 00000000  1b 5b 31 6d 1b 5b 37 6d  25 1b 5b 32 37 6d 1b 5b  |.[1m.[7m%.[27m.[|
> 00000010  31 6d 1b 5b 6d 20 20 20  20 20 20 20 20 20 20 20  |1m.[m           |
> 00000020  20 20 20 20 20 20 20 20  20 20 20 20 20 20 20 20  |                |
> *
> 00000060  20 20 20 20 0d 20 0d 0d  1b 5b 6d 1b 5b 32 37 6d  |    . ...[m.[27m|
> 00000070  1b 5b 32 34 6d 1b 5b 4a  7a 69 72 61 25 20 1b 5b  |.[24m.[Jzira% .[|
> 00000080  4b 1b 5b 3f 32 30 30 34  68 62 08 62 69 6e 64 6b  |K.[?2004hb.bindk|
> 00000090  65 79 20 2d 65 1b 5b 3f  32 30 30 34 6c 0d 0d 0a  |ey -e.[?2004l...|
> 000000a0  1b 5b 31 6d 1b 5b 37 6d  25 1b 5b 32 37 6d 1b 5b  |.[1m.[7m%.[27m.[|
> 000000b0  31 6d 1b 5b 6d 20 20 20  20 20 20 20 20 20 20 20  |1m.[m           |
> 000000c0  20 20 20 20 20 20 20 20  20 20 20 20 20 20 20 20  |                |
> *
> 00000100  20 20 20 20 0d 20 0d 0d  1b 5b 6d 1b 5b 32 37 6d  |    . ...[m.[27m|
> 00000110  1b 5b 32 34 6d 1b 5b 4a  7a 69 72 61 25 20 1b 5b  |.[24m.[Jzira% .[|
> 00000120  4b 1b 5b 3f 32 30 30 34  68 07 7e                 |K.[?2004h.~|
> 0000012b
> 
> The 07 7e is what the exec-formatted generates (the Ctrl-G doesn't
> seem to have any effect in zsh).

exec-formatted doesn't send a ^G, it simply does an execvp() for the arguments.

The escape "[?2004h" is turning on bracketed paste (which I asked about).
 
> If after "binkey -e", I type "echo '" then Ctrl-V, I get:
> 
> 00000120  4b 1b 5b 3f 32 30 30 34  68 65 08 65 63 68 6f 20  |K.[?2004he.echo |
> 00000130  27 1b 5b 37 6d 5e 5b 1b  5b 32 37 6d 5b 32 30 31  |'.[7m^[.[27m[201|
> 00000140  7e                                                |~|
> 
> So, actually, the effect of exec-formatted is more complex than just
> a tilde (or Ctrl-G tilde).
> 
> > But the bug report deals with programs run from xterm, which the
> > shell wouldn't see -- unless it's reading xterm's output in some
> > way.
> 
> The shell sees the tilde, as if it were entered with the keyboard.

The shell is using bracketed paste, and is reading xterm's output,
as I suggested.
 
> Note that I can replace
> 
>   exec-formatted("browser %s", PRIMARY)
> 
> by
> 
>   exec-formatted("/bin/true", PRIMARY)
> 
> and I get the same behavior in xterm, i.e. the command doesn't matter.

so pasting works fairly consistently :-)
 
> > > then in the xterm:
> > > 
> > > zira% bindkey -e
> > 
> > Perhaps "zira%" is your shell prompt.
> 
> Yes, the hostname follwed by "%" is the default zsh prompt.
> 
> > What does "bindkey -e" have to do with exec-formatted?
> 
> "bindkey -e" selects Emacs editing mode. It just makes the issue
> visible. But with the "echo '" + Ctrl-V test, the same issue is
> reproducible without needing "bindkey -e":
> 
> 00000000  1b 5b 31 6d 1b 5b 37 6d  25 1b 5b 32 37 6d 1b 5b  |.[1m.[7m%.[27m.[|
> 00000010  31 6d 1b 5b 6d 20 20 20  20 20 20 20 20 20 20 20  |1m.[m           |
> 00000020  20 20 20 20 20 20 20 20  20 20 20 20 20 20 20 20  |                |
> *
> 00000060  20 20 20 20 0d 20 0d 0d  1b 5b 6d 1b 5b 32 37 6d  |    . ...[m.[27m|
> 00000070  1b 5b 32 34 6d 1b 5b 4a  7a 69 72 61 25 20 1b 5b  |.[24m.[Jzira% .[|
> 00000080  4b 1b 5b 3f 32 30 30 34  68 65 08 65 63 68 6f 20  |K.[?2004he.echo |
> 00000090  27 5e 08 1b 5b 37 6d 5e  1b 5b 37 6d 5b 1b 5b 32  |'^..[7m^.[7m[.[2|
> 000000a0  37 6d 5b 32 30 31 7e                              |7m[201~|
> 000000a7

That looks as expected, if you've got two different things writing to
the terminal at the same time:

https://invisible-island.net/xterm/ctlseqs/ctlseqs.html#h2-Bracketed-Paste-Mode

but the execvp command by itself doesn't do the writing

> The effect of exec-formatted is what appears after "27 5e 08".

-- 
Thomas E. Dickey <[email protected]>
https://invisible-island.net
ftp://ftp.invisible-island.net

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