check-rtorrent

#!/bin/bash
####################################################################################
#                                                                                  #
#   Simple Bash shell script that will check for rtorrent processes of all users.  #
#                                                                                  #
####################################################################################

UHOME=/home
SUBDIR=/rtorrent
PIDFILE=/.session/rtorrent.lock
RINITD=/etc/init.d/rtorrent-
USERS=( $(grep 10[0-9][0-9] /etc/passwd | cut -d: -f1) )
NUM=${#USERS[@]}

for (( i=0; i<NUM; i++ ))
do
    # Check if username has rtorrent directory
    if [ -d ${UHOME}/${USERS[${i}]}${SUBDIR} ]; then
           echo Directory ${UHOME}/${USERS[${i}]}${SUBDIR} exists!

         # Check if username has rtorrent.lock
         if [ -e ${UHOME}/${USERS[${i}]}${SUBDIR}${PIDFILE} ]; then
                  echo File ${UHOME}/${USERS[${i}]}${SUBDIR}${PIDFILE} exists!

                  # Get the PID of user's rtorrent from rtorrent.lock
                  RPID=`cut -d+ -f2 ${UHOME}/${USERS[${i}]}${SUBDIR}${PIDFILE}`
                  # echo RPID = $RPID

                  # Check if that PID is running
                  kill -0 $RPID > /dev/null 2>&1
                  if [ $? != 0 ]; then
                       echo ${USERS[${i}]}\'s rtorrent is not running...
                       echo Attempting to start ${RINITD}${USERS[${i}]}...
                       echo Deleting ${UHOME}/${USERS[${i}]}${SUBDIR}${PIDFILE} first.
                       rm -f ${UHOME}/${USERS[${i}]}${SUBDIR}${PIDFILE}
                       ${RINITD}${USERS[${i}]} start
                           sleep 2

                          if [ $? != 0 ]; then
                               echo Failed to start ${USERS[${i}]}\'s rtorrent!
                          else
                               echo Successfully started ${USERS[${i}]}\'s rtorrent.
                          fi

                  else
                       echo ${USERS[${i}]}\'s rtorrent is running...
                  fi

         else
                  # rtorrent.lock does not exist. process may not be running. reloading...
                  echo ${USERS[${i}]}\'s rtorrent.lock does not exist!

                  # Make sure no stale rtorrent pid is running
                  SPID=( $(pgrep rtorrent -u ${USERS[${i}]}) )
                  SPIDNUM=${#SPID[@]}

                     for (( j=0; j<SPIDNUM; j++ ))
                     do
                       if [ ${SPID[${j}]} > 0 ]; then
                           #  echo Killing ${USERS[${i}]}\'s stale processes...
                            kill -9 ${SPID[${j}]}
                       fi
                     done

                  # Starting rtorrent
                  ${RINITD}${USERS[${i}]} start
                     sleep 2
                          if [ $? != 0 ]; then
                               echo Failed to start ${USERS[${i}]}\'s rtorrent!
                          else
                               echo Successfully started ${USERS[${i}]}\'s rtorrent.
                             # Sleeping for 5 seconds before going to the next user
                               sleep 5
                          fi
         fi

    else
            echo Directory ${UHOME}/${USERS[${i}]}${SUBDIR} does NOT exist!
            echo Not processing user ${USERS[${i}]}...
    fi
done

exit 0