A system init script for autodl-irssi

autodl-irssi

#!/bin/sh
# https://github.com/phracker
#
# AutoDL-Irssi Init Script
# Tested on Debian 7 (Wheezy)
# Instructions:
#  - Install / configure irssi + autodl-irssi (duh)
#  - Save this script as /etc/init.d/autodl-irssi
#  - `chmod +x /etc/init.d/autodl-irssi`
#  - `insserv autodl-irssi`
#  - Enjoy!
#

# select user to run screen / irssi as
user="root"

# set of options to run with
options=""

# default directory for screen, needs to be an absolute path
base="`su -c 'echo $HOME' $user`"

# name of screen session
srnname="autodl-irssi"

# file to log to (makes for easier debugging if something goes wrong)
logfile="/var/log/autodl-init.log"

PATH=/usr/bin:/usr/local/bin:/usr/local/sbin:/sbin:/bin:/usr/sbin
DESC="IRC BitTorrent AutoDL"
NAME="autodl-irssi"
DAEMON=irssi
SCRIPTNAME=/etc/init.d/autodl-irssi

checkcnfg() {
  exists=0
  for i in `echo "$PATH" | tr ':' '\n'` ; do
    if [ -f $i/$DAEMON ] ; then
      exists=1
      break
    fi
  done
  if [ $exists -eq 0 ] ; then
    echo "cannot find irssi binary in PATH $PATH" | tee -a "$logfile" >&2
    exit 3
  fi
}

d_start() {
  [ -d "${base}" ] && cd "${base}"
  stty stop undef && stty start undef
  su -c "screen -ls | grep -sq "\.${srnname}[[:space:]]" " ${user} || su -c "screen -dm -S ${srnname} 2>&1 1>/dev/null" ${user} | tee -a "$logfile" >&2
  su -c "screen -S "${srnname}" -X screen irssi ${options} 2>&1 1>/dev/null" ${user} | tee -a "$logfile" >&2
}

d_stop() {
  pid=`ps a | grep irssi | grep -v grep | cut -f2 -d" "`
  screen_no=`screen -ls | grep "autodl-irssi" | cut -f1 -d"." | sed "s/\t//g" | sed "s/ //g"`
  if [ -z "$pid" ]; then
    echo "No instance of irssi found."
    break
  elif ps -A | grep -sq ${pid}.*irssi ; then # make sure the pid doesn't belong to another process
    kill -s INT ${pid}
  elif [ -n "$screen_no" ]; then
    screen -X -S $screen_no quit
  fi
}

checkcnfg

case "$1" in
  start)
    echo -n "Starting $DESC: $NAME"
    d_start
    echo "."
    ;;
  stop)
    echo -n "Stopping $DESC: $NAME"
    d_stop
    echo "."
    ;;
  restart|force-reload)
    echo -n "Restarting $DESC: $NAME"
    d_stop
    sleep 1s
    d_start
    echo "."
    ;;
  *)
    echo "Usage: $SCRIPTNAME {start|stop|restart|force-reload}" >&2
    exit 1
    ;;
esac

exit 0