Shell Programming and Scripting

#!/bin/bash
#
# tomcat6      This shell script takes care of starting and stopping Tomcat


if [ -r /lib/lsb/init-functions ]; then
    . /lib/lsb/init-functions
else
    exit 1
fi

DISTRIB_ID=`lsb_release -i -s 2>/dev/null`

NAME="$(basename $0)"
unset ISBOOT
if [ "${NAME:0:1}" = "S" -o "${NAME:0:1}" = "K" ]; then
    NAME="${NAME:3}"
    ISBOOT="1"
fi

# For SELinux we need to use 'runuser' not 'su'
if [ -x "/sbin/runuser" ]; then
    SU="/sbin/runuser"
else
    SU="/bin/su"
fi

# Get the tomcat config (use this for environment specific settings)
TOMCAT_CFG="/etc/tomcat6/tomcat6.conf"
if [ -r "$TOMCAT_CFG" ]; then
    . $TOMCAT_CFG
fi
# Should I turn on dynatrace?
if [ -r "/etc/sysconfig/dtagent" ]; then
   . /etc/sysconfig/dtagent
fi

# Get instance specific config file
if [ -r "/etc/sysconfig/${NAME}" ]; then
    . /etc/sysconfig/${NAME}
fi

# Define which connector port to use
CONNECTOR_PORT="${CONNECTOR_PORT:-8080}"

# Path to the tomcat launch script
TOMCAT_SCRIPT="/usr/sbin/tomcat6"

# Tomcat program name
TOMCAT_PROG="${NAME}"

# Define the tomcat username
TOMCAT_USER="${TOMCAT_USER:-tomcat}"

# Define the tomcat log file
TOMCAT_LOG="${TOMCAT_LOG:-/var/log/tomcat6/catalina.out}"

RETVAL="0"

# Look for open ports, as the function name might imply
function findFreePorts() {
    local isSet1="false"
    local isSet2="false"
    local isSet3="false"
    local lower="8000"
    randomPort1="0"
    randomPort2="0"
    randomPort3="0"
    local -a listeners="( $(
                        netstat -ntl | \
                        awk '/^tcp/ {gsub("(.)*:", "", $4); print $4}'
                    ) )"
    while [ "$isSet1" = "false" ] || \
          [ "$isSet2" = "false" ] || \
          [ "$isSet3" = "false" ]; do
        let port="${lower}+${RANDOM:0:4}"
        if [ -z `expr " ${listeners[*]} " : ".*\( $port \).*"` ]; then
            if [ "$isSet1" = "false" ]; then
                export randomPort1="$port"
                isSet1="true"
            elif [ "$isSet2" = "false" ]; then
                export randomPort2="$port"
                isSet2="true"
            elif [ "$isSet3" = "false" ]; then
                export randomPort3="$port"
                isSet3="true"
            fi
        fi
    done
}

function makeHomeDir() {
    if [ ! -d "$CATALINA_HOME" ]; then
        echo "$CATALINA_HOME does not exist, creating"
        if [ ! -d "/usr/share/${NAME}" ]; then
            mkdir /usr/share/${NAME}
            cp -pLR /usr/share/tomcat6/* /usr/share/${NAME}
        fi
        mkdir -p /var/log/${NAME} \
                 /var/cache/${NAME} \
                 /var/tmp/${NAME}
        ln -fs /var/cache/${NAME} ${CATALINA_HOME}/work
        ln -fs /var/tmp/${NAME} ${CATALINA_HOME}/temp
        cp -pLR /usr/share/${NAME}/bin $CATALINA_HOME
        cp -pLR /usr/share/${NAME}/conf $CATALINA_HOME
        ln -fs /usr/share/java/tomcat6 ${CATALINA_HOME}/lib
        ln -fs /usr/share/tomcat6/webapps ${CATALINA_HOME}/webapps
        chown ${TOMCAT_USER}:${TOMCAT_USER} /var/log/${NAME}
    fi
}

function parseOptions() {
    options=""
    # Should I turn on dynatrace?
    if [ "x$DTAGENT" == "xtrue" ] && [ "x$DTCOLLECTOR" != "x" ]; then
       options="export CATALINA_OPTS=-agentpath:/usr/share/dtagent/libdtagent.so=name=${NAME},server=${DTCOLLECTOR},logpath=/var/log/cmates,logfile=${NAME}-dtagent.log"
    fi

    if [ -r "/etc/tomcat6/tomcat6.conf" ]; then
       options="$options $(
                 awk '!/^#/ && !/^$/ { ORS=" "; print "export ", $0, ";" }' \
                 /etc/tomcat6/tomcat6.conf
             )"
    fi
    if [ -r "/etc/sysconfig/${NAME}" ]; then
        options="$options $(
                     awk '!/^#/ && !/^$/ { ORS=" "; print "export ", $0, ";" }' \
                     /etc/sysconfig/${NAME}
                 )"
    fi
    TOMCAT_SCRIPT="$options ${TOMCAT_SCRIPT}"
}


function start() {
    echo -n "Starting ${TOMCAT_PROG}: "
    if [ -f "/var/lock/subsys/${NAME}" ] ; then
        if [ -f "/var/run/${NAME}.pid" ]; then
            read kpid < /var/run/${NAME}.pid
#           if checkpid $kpid 2>&1; then
            if [ -d "/proc/${kpid}" ]; then
                log_success_msg
                if [ "$DISTRIB_ID" = "MandrivaLinux" ]; then
                    echo
                fi
                return 0
            fi
        fi
    fi
    # fix permissions on the log and pid files
    export CATALINA_PID="/var/run/${NAME}.pid"
    touch $CATALINA_PID
    chown ${TOMCAT_USER}:${TOMCAT_USER} $CATALINA_PID
    touch $TOMCAT_LOG
    chown ${TOMCAT_USER}:${TOMCAT_USER} $TOMCAT_LOG
    if [ "$CATALINA_BASE" != "/usr/share/tomcat6" ]; then
        # Create a tomcat directory if it doesn't exist
        makeHomeDir
        # If CATALINA_HOME doesn't exist modify port number so that
        # multiple instances don't interfere with each other
        #findFreePorts
        sed -i -e "s/8005/1${CONNECTOR_PORT}/g" -e "s/8080/${CONNECTOR_PORT}/g" \
            -e "s/8009/2${CONNECTOR_PORT}/g" -e "s/8443/3${CONNECTOR_PORT}/g" \
            ${CATALINA_BASE}/conf/server.xml
    fi
    parseOptions
    if [ "$SECURITY_MANAGER" = "true" ]; then
        $SU - $TOMCAT_USER -c "${TOMCAT_SCRIPT} start-security" \
            >> $TOMCAT_LOG 2>&1
    else
        $SU - $TOMCAT_USER -c "${TOMCAT_SCRIPT} start" >> $TOMCAT_LOG 2>&1
    fi
    RETVAL="$?"
    if [ "$RETVAL" -eq 0 ]; then
        log_success_msg
        touch /var/lock/subsys/${NAME}
    else
        log_failure_msg
    fi
    if [ "$DISTRIB_ID" = "MandrivaLinux" ]; then
        echo
    fi
    return $RETVAL
}

function stop() {
    RETVAL="0"
    echo -n "Stopping ${TOMCAT_PROG}: "
    if [ -f "/var/lock/subsys/${NAME}" ]; then
        if [ "$CATALINA_BASE" != "/usr/share/tomcat6" ]; then
           sed -i -e "s/8005/1${CONNECTOR_PORT}/g" -e "s/8080/${CONNECTOR_PORT}/g" \
               -e "s/8009/2${CONNECTOR_PORT}/g" -e "s/8443/3${CONNECTOR_PORT}/g" \
               ${CATALINA_BASE}/conf/server.xml
        fi
        parseOptions
        echo -n "TDump in ${TOMCAT_PROG}.catalina.out log"
        if [ -f "/var/run/${NAME}.pid" ]; then
            read kpid < /var/run/${NAME}.pid
            kill -3 $kpid
        fi
        $SU - $TOMCAT_USER -c "${TOMCAT_SCRIPT} stop" >> $TOMCAT_LOG 2>&1
        #RETVAL="$?"
        #if [ "$RETVAL" -eq "0" ]; then
            count="0"
            if [ -f "/var/run/${NAME}.pid" ]; then
                read kpid < /var/run/${NAME}.pid
                until [ "$(ps --pid $kpid | grep -c $kpid)" -eq "0" ] || \
                      [ "$count" -gt "$SHUTDOWN_WAIT" ]; do
                    if [ "$SHUTDOWN_VERBOSE" = "true" ]; then
                        echo "waiting for processes $kpid to exit"
                    fi
                    sleep 1
                    let count="${count}+1"
                done
                if [ "$count" -gt "$SHUTDOWN_WAIT" ]; then
                    if [ "$SHUTDOWN_VERBOSE" = "true" ]; then
                        echo "killing processes which didn't stop after $SHUTDOWN_WAIT seconds"
                    fi
                    kill -9 $kpid
                fi
                log_success_msg
            fi
            rm -f /var/lock/subsys/${NAME} /var/run/${NAME}.pid
        #else
        #    log_failure_msg
        #fi
    else
        log_success_msg
    fi
    if [ "$DISTRIB_ID" = "MandrivaLinux" ]; then
        echo
    fi
    return $RETVAL
}

# See how we were called.
case "$1" in
    start)
        start
        ;;
    stop)
        stop
        ;;
    restart)
        stop
        unset CATALINA_OPTS options
        start
        ;;
    condrestart|try-restart)
        if [ -f "/var/run/${NAME}.pid" ]; then
            stop
            start
        fi
        ;;
    reload)
        RETVAL="3"
        ;;
   force-reload)
        if [ -f "/var/run/${NAME}.pid" ]; then
            stop
            start
        fi
        ;;
    status)
        if [ -f "/var/run/${NAME}.pid" ]; then
#           status ${NAME}
#           RETVAL="$?"
            read kpid < /var/run/${NAME}.pid
            if [ -d "/proc/${kpid}" ]; then
                echo "${NAME} (pid ${kpid}) is running..."
                RETVAL="0"
            fi
        else
            pid="$(/usr/bin/pgrep -f -d , -u ${TOMCAT_USER} -G ${TOMCAT_USER} java.*${NAME}.*)"
            if [ -z "$pid" ]; then
#               status ${NAME}
#               RETVAL="$?"
                echo "${NAME} is stopped"
                RETVAL="3"
            else
                echo "${NAME} (pid $pid) is running..."
                RETVAL="0"
            fi
        fi
        ;;
    version)
        ${TOMCAT_SCRIPT} version
        ;;
    *)
        echo "Usage: $0 {start|stop|restart|configupdate|condrestart|try-restart|reload|force-reload|status|version}"
        RETVAL="2"
esac

exit $RETVAL