#!/bin/sh
#
# shutdown -- wrapper script to prevent erroneous shutdowns via SSH
#
# Copyright © martin f. krafft <madduck@madduck.net>
# Released under the terms of the Artistic Licence 2.0
#
# $Id: shutdown 299 2006-10-16 14:40:47Z madduck $
#
set -eu

CMD="${0##*/}"
EXEC="/sbin/$CMD"
case "$CMD" in
  halt|reboot|shutdown)
    if [ ! -x $EXEC ]; then
      echo "E: not an executable: $EXEC" >&2
      exit 3
    fi
    ;;
  *)
    echo "E: unsupported command: $CMD" >&2
    exit 1
    ;;
esac

if [ -n "${SSH_CONNECTION:-}" ] && test -t 0 && [ "${1:-}" != '--help' ]; then
  echo -n "SSH session detected, type in hostname of the machine to $CMD: "
  read HOSTNAME_USER

  HOSTNAME="$(hostname)"

  if [ "$HOSTNAME_USER" != "$HOSTNAME" ]; then
    echo "Good thing I asked; I won't $CMD $HOSTNAME ..."
    exit 2
  fi
fi

exec $EXEC "$@"