tailnet-switcher

#!/bin/sh
# picker for easily switching between Tailscale tailnets
# needs a graphical polkit agent or to run `sudo tailscale set --operator=$USER` on each tailnet

construct_list() {
  echo "$1" | while read line; do
    printf "󰖂  $(printf "$line" | awk '{print $2}')\n"
  done
}

if ! pgrep tailscaled >/dev/null 2>&1; then
  notify-send -u critical "tailscaled is not running!"
  exit 1
fi

if ! tailscale switch --list >/dev/null 2>&1; then # tailscale operator is root
  PKEXEC="pkexec"
fi

TAILNET_LIST="$($PKEXEC tailscale switch --list | tail -n +2)"
SELECTION="$(construct_list "$TAILNET_LIST" | fuzzel --dmenu --prompt='Tailnet: ' | awk '{print $2}')"

[ -z "$SELECTION" ] && exit 1 # exit if no selection has been made

TAILNET_ID="$(printf "$TAILNET_LIST" | grep "$SELECTION" | awk '{print $1}')"

if $PKEXEC tailscale switch "$TAILNET_ID"; then
  notify-send -u low "Switched to tailnet $SELECTION (ID: $TAILNET_ID)"
else
  notify-send -u critical "Failed to switch to tailnet $SELECTION (ID: $TAILNET_ID)"
fi