# Version: 0.3.5
# Copyright (c) 2005-2022:
#   Darren 'Tadgy' Austin <darren (at) afterdark.org.uk>
# Licensed under the terms of the GNU General Public License version 3.

install_file() {
  # $1 = Path of file to process (without leading /, with .new extension)

  [[ -z "$1" ]] || [[ ! -e "$1" ]] && return
  local OLDFILE="${1%.new}"

  if [[ ! -e "$OLDFILE" ]]; then
    mv "$1" "$OLDFILE"
  elif [[ -L "$OLDFILE" ]]; then
    #     |--------|-----------------------------------------------------------|
    echo "WARNING: $OLDFILE"
    echo "         is a symbolic link - the incoming .new file was not written"
    echo "         to it in order to prevent clobbering something important."
    echo
  elif [[ "$(md5sum <"$OLDFILE")" == "$(md5sum <"$1")" ]]; then
    rm -f "$1"
  else
    #     |--------|-----------------------------------------------------------|
    echo "WARNING: $OLDFILE"
    echo "         has been customised since original installation and was not"
    echo "         replaced with the incoming .new file."
    echo
  fi
}

# Install new configuration files.
install_file "etc/bash_completion.d/fail2ban.new"
install_file "etc/default/fail2ban.new"

# Add service start to rc.local
RC="rc.fail2ban"
fgrep "/etc/rc.d/$RC" etc/rc.d/rc.local >/dev/null 2>&1 || {
  echo >>etc/rc.d/rc.local
  echo "[[ -x /etc/rc.d/$RC ]] /etc/rc.d/$RC start" >>etc/rc.d/rc.local
}

# Add service shutdown to rc.local_shutdown
fgrep "/etc/rc.d/$RC" etc/rc.d/rc.local_shutdown >/dev/null 2>&1 || {
  # If rc.local_shutdown doesn't exist, create it.
  [[ -e etc/rc.d/rc.local_shutdown ]] || {
    echo "#!/bin/bash" >etc/rc.d/rc.local_shutdown
    chmod 755 etc/rc.d/rc.local_shutdown
  }
  echo >>etc/rc.d/rc.local_shutdown
  echo "[[ -x /etc/rc.d/$RC ]] && /etc/rc.d/$RC stop" >>etc/rc.d/rc.local_shutdown
}