#!/bin/sh

############################################################################
#Optware package of rtorrent uses non-standard layout of directories.     ##
#Uncomment the following line to switch to the default layout of rtorrent.##
############################################################################
#dirlayout="RTORRENT_DEFAULT"

#############
###<Notes>###
#############
# This script depends on screen.
# For the stop function to work, you must set an
# explicit session directory using ABSOLUTE paths (no, ~ is not absolute) in your rtorrent.rc.
# If you typically just start rtorrent with just "rtorrent" on the
# command line, all you need to change is the "user" option.
# Attach to the screen session as your user with 
# "screen -dr rtorrent". Change "rtorrent" with srnname option.
# Licensed under the GPLv2 by lostnihilist: lostnihilist _at_ gmail _dot_ com
##############
###</Notes>###
##############

#######################
##Start Configuration##
#######################
# You can specify your configuration in a different file 
# (so that it is saved with upgrades, saved in your home directory,
# or whateve reason you want to)
# by commenting out/deleting the configuration lines and placing them
# in a text file (say /home/user/.rtorrent.init.conf) exactly as you would
# have written them here (you can leave the comments if you desire
# and then uncommenting the following line correcting the path/filename 
# for the one you used. note the space after the ".".
# . /etc/rtorrent.init.conf

#Do not put a space on either side of the equal signs e.g.
# user = user 
# will not work
# system user to run as
user="root"

# the system group to run as, not implemented, see d_start for beginning implementation
# group=`id -ng "$user"`

prefix="/opt"

# the full path to the filename where you store your rtorrent configuration
if [ "${dirlayout}" = "RTORRENT_DEFAULT" ] ; then
  config="${prefix}/home/${user}/.rtorrent.rc"
else
  config="/opt/etc/rtorrent.conf"
fi

# set of options to run with
if [ "${dirlayout}" = "RTORRENT_DEFAULT" ] ; then
  options=""
else
  options="-n -o import=${config}"
fi

# default directory for screen, needs to be an absolute path
if [ "${dirlayout}" = "RTORRENT_DEFAULT" ] ; then
  base="${prefix}/home/${user}"
else
  base="/opt/share/torrent"
fi

# name of screen session
srnname="rtorrent"

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

#######################
###END CONFIGURATION###
#######################
PATH=/opt/bin:/opt/sbin:/usr/bin:/sbin:/bin:/usr/sbin
DESC="rtorrent"
NAME=rtorrent
DAEMON=$NAME
SCRIPTNAME=/etc/init.d/$NAME

# Do not proceed unless some apps are available.
test -x /opt/bin/screen || ( echo "screen not found." | tee -a "$logfile" >&2 ; exit 2 )


checkcnfg() {
   exists=0
   for i in `echo "$PATH" | tr ':' '\n'` ; do
      if [ -f "$i/$NAME" ] ; then
         exists=1
         break
      fi
   done


   if [ $exists -eq 0 ] ; then
      echo "cannot find rtorrent binary in PATH $PATH" | tee -a "$logfile" >&2
      exit 3
   fi
   if ! [ -r "${config}" ] ; then 
      echo "cannot find readable config ${config}. check that it is there and permissions are appropriate" | tee -a "$logfile" >&2
      exit 3 
   fi 
   session=`getsession "$config"` 
   if ! [ -d "${session}" ] ; then
      echo "cannot find readable session directory ${session} from config ${config}. check permissions" | tee -a "$logfile" >&2
      exit 3
   fi
}

d_start() {
  [ -d "${base}" ] && cd "${base}"

  stty stop undef && stty start undef
  screen -ls | grep -sq "\.${srnname}[[:space:]]"  || su -c "screen -dm -S ${srnname} 2>&1 1>/dev/null" ${user} | tee -a "$logfile" >&2
  # this works for the screen command, but starting rtorrent below adopts screen session gid
  # even if it is not the screen session we started (e.g. running under an undesirable gid
  #screen -ls | grep -sq "\.${srnname}[[:space:]]"  || su -c "sg \"$group\" -c \"screen -fn -dm -S ${srnname} 2>&1 1>/dev/null\"" ${user} | tee -a "$logfile" >&2
  screen -S "${srnname}" -X screen rtorrent ${options} 2>&1 1>/dev/null | tee -a "$logfile" >&2
}

d_stop() {
   session=`getsession "$config"`
   if ! [ -s ${session}/rtorrent.lock ] ; then
      return
   fi
   pid=`cat ${session}/rtorrent.lock | awk -F: '{print($2)}' | sed "s/[^0-9]//g"`
   if ps | grep -sq ${pid}.*rtorrent ; then # make sure the pid doesn't belong to another process
      kill -s INT ${pid}
   fi
}

getsession() { 
   session=`awk '/^[[:space:]]*session[[:space:]]*=[[:space:]]*/{print($3)}' "$config"`
   echo $session
}

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 1
   d_start
   echo "."
   ;;
  *)
   echo "Usage: $SCRIPTNAME {start|stop|restart|force-reload}" >&2
   exit 1
   ;;
esac

exit 0