tmux open terminal failed: not a terminal

Question

I have a shell script that is enabled as service to start multiple shell scripts e.g.

service started script -> script1, script2 ,script3  

script1 should open a program in a tmux window, and it does work just fine if I manually start the script via ./script1.sh, however when started at boot via the service started script it does not with the above error:

open terminal failed: not a terminal 

Why is this happening?

Answer 1

There is an answer already here, but this link I think summarises it better. In a nutshell, use the -t flag:

ssh -t host tmux attach 

If you want to set it into your .ssh/config file, look in the ssh_config manpage for the RequestTTY option:

 RequestTTY          Specifies whether to request a pseudo-tty for the session.  The          argument may be one of: ``no'' (never request a TTY), ``yes''          (always request a TTY when standard input is a TTY), ``force''          (always request a TTY) or ``auto'' (request a TTY when opening a          login session).  This option mirrors the -t and -T flags for          ssh(1). 

Answer 2

I think the issue is that the service does not have an associated tty. A workaround I've found is to change your tmux call in your script to

tmux new-session -s username -d 

(username a user for whom the service was started)