#!/bin/bash

# Determine whether stdout is on a terminal
if [ -t 1 ] ; then
  # Prepare a function to send HUP signal to vtysh in the container
  # we mark the new instance of vtysh with the current tty as a tag
  TTY=$(tty)
  function cleanup
  {
    docker exec -i bgp pkill -HUP -f "vtysh $TTY"
  }
  trap cleanup HUP
  docker exec -ti bgp vtysh "$TTY" "$@"
else
  docker exec -i bgp vtysh "$@"
fi