MacOS: Command with long arguments stops in the middle of send-keys.

[aero]

Environment: MacOS 10.14.3(Mojave), tmux 2.8

My test command with long arguments.

$ xpanes --debug -s -c 'ping {}' host{1..60}.domain.com

but it stops in the middle of send-keys. I have no problem on linux.

$ /usr/local/bin/xpanes '--debug' '-s' '-c' 'ping {}' '--' 'host1.domain.com' 'host2.domain.com' 'host3.domain.com' 'host4.domain.com' 'host5.domain.com' 'host6.domain.com' 'host7.domain.com' 'host8.domain.com' 'host9.domain.com' 'host10.domain.com' 'host11.domain.com' 'host12.domain.com' 'host13.domain.com' 'host14.domain.com' 'host15.domain.com' 'host16.domain.com' 'host17.domain.com' 'host18.domain.com' 'host19.domain.com' 'host20.domain.com' 'host21.domain.com' 'host22.domain.com' 'host23.domain.com' 'host24.domain.com' 'host25.domain.com' 'host26.domain.com' 'host27.domain.com' 'host28.domain.com' 'host29.domain.com' 'host30.domain.com' 'host31.domain.com' 'host32.domain.com' 'host33.domain.com' 'host34.domain.com' 'host35.domain.com' 'host36.domain.com' 'host37.domain.com' 'host38.domain.com' 'host39.domain.com' 'host40.domain.com' 'host41.domain.com' 'host42.domain.com' 'host43.domain.com' 'host44.domain.com' 'host45.domain.com' 'host46.domain.com' 'host47.domain.com' 'host48.domain.com' 'host49.domain.<-- stops here.

[greymd]

Hi @aero !

Hmm ... I cannot reproduce it on my macOS with iTerm2 and tmux 2.8. It seems that you run this command on the normal terminal (outside of tmux session), don't you ?

What's happened if you run it on the tmux session? What terminal software are you using ?

[aero]

@greymd

Hmm ... I cannot reproduce it on my macOS with iTerm2 and tmux 2.8. It seems that you run this command on the normal terminal (outside of tmux session), don't you ?

Yes, I had run on the normal terminal both on linux and MacOS.

What's happened if you run it on the tmux session? What terminal software are you using ?

Within tmux session, I have no problem. Why does tmux's send-keys stop in vanilla MacOS's ITerm2 session ?

[greymd]

I could re-produce the same issue with following configures.

• From out of tmux session
• zsh 5.5.1
• iTerm2
• Sierra
• tmux 2.6, 2.7 and 2.8

Thank you for let me know it! As you said, the sent text given by send-keys is defective.

/usr/local/bin/xpanes '--debug' '-s' '-c' 'ping {}'  '--' 'host1.domain.com' 'host2.domain.com' 'host3.domain.com' 'host4.domain.com' 'host5.domain.com' 'host6.domain.com' 'host7.domain.com' 'host8.domain.com' 'host9.domain.com' 'host10.domain.com' 'host11.domain.com' 'host12.domain.com' 'host13.domain.com' 'host14.domain.com' 'host15.domain.com' 'host16.domain.com' 'host17.domain.com' 'host18.domain.com' 'host19.domain.com' 'host20.domain.com' 'host21.domain.com' 'host22.domain.com' 'host23.domain.com' 'host24.domain.com' 'host25.domain.com' 'host26.domain.com' 'host27.domain.com' 'host28.domain.com' 'host29.domain.com' 'host30.domain.com' 'host31.domain.com' 'host32.domain.com' 'host33.domain.com' 'host34.domain.com' 'host35.domain.com' 'host36.domain.com' 'host37.domain.com' 'host38.domain.com' 'host39.domain.com' 'host40.domain.com' 'host41.domain.com' 'host42.domain.com' 'host43.domain.com' 'host44.domain.com' 'host45.domain.com' 'host46.domain.com' 'host47.domain.com' 'host48.domain.com' 'host49.domain.

Let me check it further more.

[greymd]

This issue can be produced without xpanes ( see later ). This is most likely due to the bug given by the tmux built on the macOS.

For now, the workaround is start the xpanes on the running tmux session (xpanes does not call send-keys when the tmux session is ongoing). But, let me check further. I may find another workaround. I believe xpanes can run without send-keys even if it's on the outside of tmux session.

Result of investigation

In my environment

• tmux 2.6
• macOS Sierra
• iTerm2
• bash & zsh

1. open new tmux session
2. Run this command on the tmux session

$ tmux send-keys "$(yes | head -n 1024 | tr -d '\n')" C-m

=> same issue

$ tmux send-keys "$(yes | head -n 1023 | tr -d '\n')" C-m

=> the issue is not produced and error message of the shell is displayed

zsh: file name too long: yyy....

bash: yy...yy : command not found

I noticed following conditions

• As you reported, it is not reproduced on the Linux (Checked on Ubuntu 18.04.1 LTS).
• This is not reproduced when the send-keys target is the different tmux window. tmux send-keys -t <different window id> "$(yes | head -n 1024 | tr -d '\n')" C-m

[greymd]

This issue is going to be fixed next version v3.1.1. new-session is used instead of send-keys. This way is more efficient.

https://github.com/greymd/tmux-xpanes/commit/9df78a856e34d420fb2d0acc720227c5e825ca80

[greymd]

v3.1.1 is released and this issue is resolved. If it continues, please reopen it. Thanks!