tmux fails to start in local session

[kasper93]

Environment

Windows 10.0.18363.0
tmux/tmux@f986539
WT @ 31efd69
Fully updated Cygwin as of 2020-03-26
Fully updated MSYS2 as of 2020-03-26

Steps to reproduce

1. Run tmux

Expected behavior

tmux works

Actual behavior

tmux doesn't work

open terminal failed: not a terminal

Even more info

tmux works fine in

• Cygwin@Mintty
• MSYS2@Mintty
• wsl
• in ssh session

[DHowett-MSFT]

This is almost certainly a Cygwin runtime issue, as it’s failing to detect that the windows console host is attached. MinTTY is somewhat of a red herring- it has a special handshake that it does with Cygwin to assume terminal responsibility.

How are you launching your Cygwin profile?

[kasper93]

For Cygwin I do (it is the same with bash):

"commandline": "C:/cygwin/bin/zsh.exe --login -i",

For MSYS2 (but it is Cygwin in disguise, so probably the same issue)

"commandline": "C:/MSYS/msys2_shell.cmd -defterm -no-start",

MinTTY is somewhat of a red herring- it has a special handshake that it does with Cygwin to assume terminal responsibility.

I understand that. I report here, because it would be nice to make it work in WT. But if you tell me that it need to be fixed on Cygwin side I guess I will redirect my request to them.

I did quick test with ConEmu and it has the same issue,

Ugh, I may have fire to fast with reporting this issue. It seems to be known issue.
cmderdev/cmder#453
alacritty/alacritty#1687
vercel/hyper#3608

[zadjii-msft]

Thanks for following up with all those other issues! Looks like there's a pretty broad problem across terminal emulators on Windows. Do you know if there's actually an upstream bug on cygwin that's tracking this bug? I'd love to resolve this issue as a dup of the upstream one, but I want to make sure the diligence is done ☺️

[kasper93]

I searched their ML and there seems to be no report about this specific issue. They don't have public bug tracker except mailing list. I will send them mail and see what they say.

[DHowett-MSFT]

Since this looks pretty widespread, I'm gonna close out our copy of it. I'd definitely watch their mailing list, though, if I had a link to an ML archive for this report 😄