#!/bin/bash

# when mosh isn't installed on the server, but tmux is, use this to get a
# fairly persistent set of remote shell sessions.  I used to use autossh here,
# but that means surprise dialogs asking to authorise use of an SSH key;
# instead, just hit <Ret> to restart a window's connection when it's
# convenient
#
# (The reason that I get prompted is because I have a short
# ServerAliveInterval and low ServerAliveCountMax, but that's desirable,
# because unresponsive SSH sessions are a massive pain)

host="$1"
session="${2:-default}"
prompt="Press any key to reconnect to tmux session $session on $host; d/C-d/C-c to give up .."

while true; do
    ssh -t "$host" "tmux new-session -A -s $session"
    clear
    read -n 1 -r -s -p "$prompt" ch
    [ "$ch" = $'\04' -o "$ch" = d ] && exit
done