add tmux_start.bsh

Copy/edit into forgejo

tmux_start.bsh

@@ -0,0 +1,39 @@
+#!/bin/bash
+
+# Lacking an existing tmux session, create one with a number of running windows.
+# I want to run tmux for root in one screen window, and tmux for current user in another screen window;
+# take the session name as a parameter
+
+# start detached (-d), with session name (-s), then new windows with title (-t) per command to run
+# #$user_id can be either the id of the current user, or #0 when called for root
+create_tmux_session () {
+    local session_name=$1
+    local user_id = $2
+    sudo -u "#$user_id" tmux new-session -d -s $session_name
+    sudo -u "#$user_id" tmux new-window -t $session_name:1 -n 'htop' 'htop'
+    sudo -u "#$user_id" tmux new-window -t $session_name:1 -n 'iftop' 'iftop'
+    sudo -u "#$user_id" tmux new-window -t $session_name:1 -n 'powertop' 'powertop'
+    sudo -u "#$user_id" tmux new-window -t $session_name:1 -n 'logs' 'cd /var/log'
+    sudo -u "#$user_id" tmux new-window -t $session_name:1 -n 'commands' 
+}
+
+# before creating a new session, check if it exists. If so, attach to it 
+# use `sudo -u #` to allow for easy switching between user and root session in calling
+attach_or_create_tmux_session () {
+    local session_name=$1
+    if tmux has-session -t $session_name 2>/dev/null; then 
+        echo "Sessie $session_name gevonden, attaching..."
+        sudo -u "#$user_id" tmux attach-session -t $session_name
+    else 
+        echo "Sessie $session_name niet gevonden, create & attach..."
+        attach_or_create_tmux_session $session_name $user_id
+        sudo -u "#$user_id" tmux attach-session -t $session_name
+}
+
+# start/attach a session for the current user
+current_user=$(whoami)
+current_user_id=$(id -u)
+attach_or_create_tmux_session "$current_user" "$current_user_id"
+
+# start/attach a session for root 
+attach_or_create_tmux_session "root" "0"