tmux bash exit bash when terminating tmux by default but with exceptions

Question

this one is rather complicated to explain and I failed in imagining a short description of this to be able to search for.

My current setting is that when I open a terminal, due to this line

if [[ -n "$PS1" ]] && [[ -z "$TMUX" ]]
then
        tmux && exit
fi

tmux is started instantly. And since I've got an && exit after the tmux command the the tmux encapsulating shell is closed instantly when exiting tmux.

I think this is a nice behaviour by default, but in rare occasions I want to detach or exit tmux without exiting the encapsulating shell.

I thought I'd can do this by entering exit 1 inside tmux so that the exit code of tmux is !=0 and thus the exit of the encapsulating shell isn't executed, but it seems that tmux is exiting with exit code 0 despite the exit 1 inside.

Can anyone imagine a way to realize my aim to exit the encapsulating bash by default but being able to manually change this?

Answer 1

You can make tmux detach with a nonzero exit status by doing:

tmux detach -E false

Perhaps make an alias to do that.

If you want your shell to exit as well, you can do:

tmux detach -E false; exit