tmux over ssh #3541

leier69 · 2021-04-27T15:41:09Z

OS: Arch Linux (btw)
Bug is on x11 and wayland.
Bug is not present using alacritty, or gnome terminal.

Bug:

I ssh and tmux works as expected on my server, but when I try to do control shortcusts in tmux or bash it does not work and prints random characters. Example bellow.

[2000][leier@serverhost][] /home/leier$ 7;5uc7;5uc7;5u9;5u9;5u9;5u9;5u9;5u7;5uc8;5u8;5u8;5u8;5u
-bash: 7: command not found
-bash: 5uc7: command not found
-bash: 5uc7: command not found
-bash: 5u9: command not found
-bash: 5u9: command not found
-bash: 5u9: command not found
-bash: 5u9: command not found
-bash: 5u9: command not found
-bash: 5u7: command not found
-bash: 5uc8: command not found
-bash: 5u8: command not found
-bash: 5u8: command not found
-bash: 5u8: command not found
-bash: 5u: command not found
[2001][leier@serverhost][] /home/leier$

❯ kitty --debug-config 
kitty 0.20.1 created by Kovid Goyal
Linux arch 5.11.16-arch1-1 #1 SMP PREEMPT Wed, 21 Apr 2021 17:22:13 +0000 x86_64
Arch Linux \r (\l)
LSB_VERSION=1.4
DISTRIB_ID=Arch
DISTRIB_RELEASE=rolling
DISTRIB_DESCRIPTION="Arch Linux"
Loaded config files: /home/leier/.config/kitty/kitty.conf
Running under: X11

Config options different from defaults:
background            Color(red=10, green=15, blue=20)
bold_font             Hack Bold
bold_italic_font      Hack Bold Italic
draw_minimal_borders  False
font_family           Hack
font_size             13.0
initial_window_height (650, 'px')
initial_window_width  (900, 'px')
italic_font           Hack Italic
linux_display_server  x11
remember_window_size  False
term                  xterm-256color
window_border_width   (0, 'pt')
Added shortcuts:
	ctrl++ KeyAction(func='change_font_size', args=(True, '+', 2.0))
	ctrl+- KeyAction(func='change_font_size', args=(True, '-', 2.0))

The text was updated successfully, but these errors were encountered:

leier69 · 2021-04-27T15:41:52Z

For specificity: It happens when I try to do any ctrl+anything shortcut. both bash and tmux shortcuts.

And I'm pretty sure this did not happen in past kitty versions. I moved to alacritty and is now moving back to kitty.

kovidgoyal · 2021-04-27T15:44:49Z

See https://sw.kovidgoyal.net/kitty/faq.html#i-am-using-tmux-and-have-a-problem

And I can tell you that doing ssh and then running tmux and pressing
either ctrl+c or ctrl+d works as expected on my arch system.

leier69 · 2021-04-27T15:46:05Z

@kovidgoyal I love that its you maintaining kitty. Your so awesome man. Thanks for quick answer!

kovidgoyal · 2021-04-27T15:48:20Z

You're welcome :)

leier69 · 2021-04-27T15:55:56Z

Wait... That did not answer me tho. I really need tmux over ssh for my work. I tried reading up on doc and various issues, but the issue still remain ☹️ Is there any work around? @kovidgoyal

Luflosi · 2021-04-27T15:58:03Z

See what echo $TERM prints inside and outside of tmux.

leier69 · 2021-04-27T16:01:11Z

outside tmux or ssh:

❯ echo $TERM    
xterm-256color

when I ssh to server:

[2002][leier@server][] /home/leier$ echo $TERM
xterm-256color

when I tmux:

[2004][leier@server][] /home/leier$ echo $TERM
screen

Luflosi · 2021-04-27T16:02:43Z

Set it to xterm-kitty outside of tmux.

leier69 · 2021-04-27T16:04:29Z

I get this when I ssh into the server then @Luflosi

tput: unknown terminal "xterm-kitty"

and no colors

leier69 · 2021-04-27T16:05:31Z

Then when trying to start tmux, I get this:

open terminal failed: missing or unsuitable terminal: xterm-kitty

Luflosi · 2021-04-27T16:05:44Z

See https://sw.kovidgoyal.net/kitty/faq.html#i-get-errors-about-the-terminal-being-unknown-or-opening-the-terminal-failing-when-sshing-into-a-different-computer.

Luflosi · 2021-04-27T16:08:29Z

Does tmux print this error? Does infocmp xterm-kitty print something on the server?

leier69 · 2021-04-27T16:17:35Z

infocmp xterm-kitty shows the same on the remote host inside and outside tmux after using kitty +kitten ssh myserver.

That fixed the color issue. But ctrl+l or any tmux command still does not work. @Luflosi. And I appriciate you taking out time to help the ones with special needs

Luflosi · 2021-04-27T16:26:29Z

Is TERM set to xterm-kitty on your local machine, outside of SSH?

kovidgoyal · 2021-04-27T16:31:59Z

What ctrl keys are you pressing?

leier69 · 2021-04-27T16:36:10Z

local machine or plain kitty:

❯ echo $TERMINFO $TERM
/usr/lib/kitty/terminfo xterm-kitty

Inside ssh without tmux:

[2002][leier@server][] /home/leier$ echo $TERMINFO $TERM
xterm-kitty

Inside ssh with tmux:

[2002][leier@server][] /home/leier$ echo $TERMINFO $TERM
screen

leier69 · 2021-04-27T16:36:55Z

@koekeishiya Im pressing forexample ctrl+l to clear the terminal, or ctrl+a AKA my tmux modifier.

kovidgoyal · 2021-04-27T16:44:01Z

And this happens only inside tmux, not if you just ssh and press those
keys?

leier69 · 2021-04-27T16:45:53Z

yea :(

leier69 · 2021-04-27T16:46:10Z

[2000][leier@serverhost][] /home/leier$ 7;5uc7;5uc7;5u9;5u9;5u9;5u9;5u9;5u7;5uc8;5u8;5u8;5u8;5u
-bash: 7: command not found
-bash: 5uc7: command not found
-bash: 5uc7: command not found
-bash: 5u9: command not found
-bash: 5u9: command not found
-bash: 5u9: command not found
-bash: 5u9: command not found
-bash: 5u9: command not found
-bash: 5u7: command not found
-bash: 5uc8: command not found
-bash: 5u8: command not found
-bash: 5u8: command not found
-bash: 5u8: command not found
-bash: 5u: command not found
[2001][leier@serverhost][] /home/leier$

kovidgoyal · 2021-04-27T16:50:08Z

Then its likely something in your tmux config, bisect it to find the
culprit.

crepppy · 2021-04-28T17:47:55Z

I am also getting this issue, only started happening after updating kitty recently, not sure which commit caused the error

I am also unable to press enter

trygveaa · 2021-04-28T20:08:04Z

@leier69, @crepppy: Have you tried removing your tmux and shell config? It sounds like you have something enabling the new keyboard protocol introduced in version 0.20.0.

nerdrew · 2021-04-29T17:29:34Z

I also started seeing this with the recent kitty update (0.20.0). No control keys work for me (e.g. C-c, C-z).

nerdrew · 2021-04-29T17:36:25Z

I'm not sure if showkey is the right way to show this, but here's the showkey output for C-c:

outside tmux:

> showkey -a

Press any keys - Ctrl-D will terminate this program

^C 	 3 0003 0x03

inside tmux:

> showkey -a

Press any keys - Ctrl-D will terminate this program

^[[99;5u         27 0033 0x1b
         91 0133 0x5b
         57 0071 0x39
         57 0071 0x39
         59 0073 0x3b
         53 0065 0x35
        117 0165 0x75

trygveaa · 2021-04-29T22:13:54Z

@nerdrew: Please read my comment and try that:

Have you tried removing your tmux and shell config? It sounds like you have something enabling the new keyboard protocol introduced in version 0.20.0.

Your showkey output does indeed confirm that the new keyboard protocol is enabled inside tmux for you.

nerdrew · 2021-04-29T22:18:02Z

Looking now. FWIW, I don't have a shell or tmux config for my user. Do you know how to only use default configs for tmux?

nerdrew · 2021-04-29T22:20:21Z

What would enable the new keyboard protocol? That might be easier for me to search for in the running config :)

nerdrew · 2021-04-29T22:28:31Z

From what I can tell, this happens with the default settings for my tmux (version 1.8). I.e. there is no ~/tmux.conf , /etc/tmux.conf and it still happens when I start bash with sh or bash --noprofile --norc

trygveaa · 2021-04-29T22:40:56Z

Hm, okay. It does not happen for me with tmux 3.1c or 3.2. Version 1.8 is very old (8 years), so you should probably try upgrading it.

You can provide an empty config for tmux with the -f option, though if tmux is already running you have to use -L or -S so it doesn't connect to the existing session and uses that config. E.g.

tmux -f /dev/null -L tmux-test

You can see how the protocol is enabled in the docs i linked:

Emit the escape code CSI > 1 u at application startup or when entering alternate screen mode

So e.g. printf '\e[>1u', though it doesn't have to be enabled with this exact command of course.

nerdrew · 2021-04-29T22:45:21Z

Upgrade: LOL. I wish. Appears to still be broken when starting tmux with tmux -f /dev/null new-session sh

trygveaa · 2021-04-29T22:47:17Z

Do you have tmux running? As I said, you have to use -L or -S, otherwise it will use the same config as the running tmux (even if you use new-session).

nerdrew · 2021-04-29T22:48:39Z

no, tmux is not running

kovidgoyal · 2021-04-30T01:15:21Z

You need to ask the tmux developers why your version of tmux is doing that. And you can turn off extended keyboard mode with printf '\e[<u'

nerdrew · 2021-04-30T03:34:30Z

Interesting. printf '\e[>1u' doesn't fix it.

nerdrew · 2021-04-30T03:35:22Z

If I start screen and then start tmux, everything works...

nerdrew · 2021-04-30T03:42:31Z

Derp. I mean printf '\e[<u' doesn't fix it.

kovidgoyal · 2021-04-30T03:43:07Z

Try doing it multiple times since its a stack.

nerdrew · 2021-04-30T03:50:34Z

LOL. I needed to do printf "\033Ptmux;\033\033[<u\033\\" to get it past the tmux filtering of unknown escape codes...

nerdrew · 2021-04-30T03:53:06Z

Thanks!

benoitjpnet · 2021-05-27T04:26:45Z

LOL. I needed to do printf "\033Ptmux;\033\033[<u\033\\" to get it past the tmux filtering of unknown escape codes...

I have the same bug... And this resolve it.
This is a regression as previous version of Kitty were working fine. Seems not backward compatible!

…al/kitty#3541

…ovidgoyal/kitty#3541" This reverts commit 8f283b1. It didn't work for subsequent connections - I'll just get a newer Tmux compiled where needed ¯\_(ツ)_/¯

leier69 added the bug label Apr 27, 2021

kovidgoyal closed this as completed Apr 27, 2021

kovidgoyal mentioned this issue Dec 1, 2021

Kitty running tmux in amazonlinux is broken #4305

Closed

cspeterson added a commit to cspeterson/dotfiles that referenced this issue Nov 1, 2022

Tmux: add special handling for newer Kitty terminal versions kovidgoy…

8f283b1

…al/kitty#3541

tmux over ssh #3541

tmux over ssh #3541

Comments

leier69 commented Apr 27, 2021

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