The Fish shell is launched in a subshell instead of being launched directly

[regivanx]

byobu version 5.133
tmux 3.3a

Hi, the process tree with fish is:

─ tmux│tmux: server│ -u -2 -f /usr/share/byobu/profiles/tmuxrc new-session 'htop' ; rename-window htop ; new-window -n vi ; new-window -n shell ; split-window -h ;
  ├─ fish -c 'htop'
  │ └─ htop
  ├─ fish -c /usr/bin/fish
  │ └─ fish
  ├─ fish -c /usr/bin/fish
  │ └─ fish
  └─ fish -c /usr/bin/fish
     └─ fish

The process tree with bash is:

─ tmux│tmux: server│ -u -2 -f /usr/share/byobu/profiles/tmuxrc new-session 'htop' ; rename-window htop ; new-window -n vi ; new-window -n shell ; split-window -h ;
  ├─ htop
  ├─ bash│/bin/bash
  ├─ bash│/bin/bash
  └─ bash│/bin/bash

The only difference between these two trees is:

chsh -s /bin/bash
chsh -s /usr/bin/fish

Memory consumption with fish is therefore double what is expected.

[regivanx (regivanx)]

Proposed fix:

in the file $BYOBU_PREFIX/share/byobu/profiles/tmux

replace line 70:

set -g default-command $SHELL

by:

set -g default-command 'exec $SHELL'

[regivanx (regivanx)]

Note that the fix is not complete.

when I create a new tmux window to launch an application, not a shell:

$ tmux new window vi

with fish: tmux runs a fish subshell which runs vi,

with bash: tmux runs vi directly