basic init wrappers for long running processes, hudson, django runserver, etc.

hudson.sh

#!/usr/bin/env bash
# A basic init wrapper for hudson. Designed to be generic enough for any long running process.
# Only tested on Mac OS 10.6

usage(){
cat << EOF

${0##*/} - A basic init wrapper for hudson.
Usage:  
    $0 ( start | stop | status )

Acknowledgments:
    Copyright (c) 2010 Richard Bronosky
    Offered under the terms of the MIT License.
    http://www.opensource.org/licenses/mit-license.php
    Created while employed by CMGdigital
EOF
exit 1
}

CMD="java -jar ${0%/*}/hudson.war"
LOG=${0%.*}.log
LOG_LINES=6
LOG_WAIT=4
PID_FILE=$(cd ${0%/*}; echo -n $(pwd)/$(basename ${0%.*}.pid))
test -f $PID_FILE && PID=$(cat $PID_FILE)

case $1 in
    start)
        LOG_LENGTH=$(wc -l $LOG|awk '{print $1}')
        nohup $CMD >>$LOG 2>&1 &
        PID=$!;
        echo $PID > $PID_FILE;
        if([[ $LOG_LINES > 0 ]]); then
            sleep $LOG_WAIT;
            awk -v lines=$LOG_LENGTH -v max=$((LOG_LENGTH+LOG_LINES)) 'NR>lines{print} NR==max{exit 0}' $LOG;
        fi
        ;;
    stop)
        #kill $PID
        kill $(ps -o 'ppid pid' | awk -v pid=$PID '$1==pid{print $2} END{print pid}')
        while true; do
            if ps $PID >/dev/null; then
                sleep .1;
                echo -n .;
            else
                break;
            fi
        done
        echo;
        [[ -f $PID_FILE ]] && rm $PID_FILE;
        ;;
    status)
        if [[ $PID > 0 ]]; then
            if ps $PID | grep -q "$CMD"; then
                echo "Running as pid $PID."
            else
                echo "Not running, even though $(cd $(dirname $PID_FILE); echo -n $(pwd)/$(basename $PID_FILE)) suggests pid $PID."
            fi
        else
            echo "Not running."
        fi
        ;;
    *)
        usage;;
esac

runserver.sh

#!/usr/bin/env bash
# A basic init wrapper for django runserver. Designed to be generic enough for any long running process.
# Only tested on Mac OS 10.6

usage(){
cat << EOF

${0##*/} - A basic init wrapper for django runserver.
Usage:  
    $0 ( start | stop | status )

Acknowledgments:
    Copyright (c) 2010 Richard Bronosky
    Offered under the terms of the MIT License.
    http://www.opensource.org/licenses/mit-license.php
    Created while employed by CMGdigital
EOF
exit 1
}

CMD="django-admin.py runserver 8000"
LOG=$VIRTUAL_ENV/var/runserver.log
LOG_LINES=6
LOG_WAIT=4
PID_FILE=$VIRTUAL_ENV/var/runserver.pid
test -f $PID_FILE && PID=$(cat $PID_FILE)

case $1 in
    start)
        LOG_LENGTH=$(wc -l $LOG|awk '{print $1}')
        nohup $CMD >>$LOG 2>&1 &
        PID=$!;
        echo $PID > $PID_FILE;
        if([[ $LOG_LINES > 0 ]]); then
            sleep $LOG_WAIT;
            awk -v lines=$LOG_LENGTH -v max=$((LOG_LENGTH+LOG_LINES)) 'NR>lines{print} NR==max{exit 0}' $LOG;
        fi
        ;;
    stop)
        kill $(ps -o 'ppid pid' | awk -v pid=$PID '$1==pid{print $2} END{print pid}')
        while true; do
            if ps $PID >/dev/null; then
                sleep .1;
                echo -n .;
            else
                break;
            fi
        done
        echo;
        [[ -f $PID_FILE ]] && rm $PID_FILE;
        ;;
    status)
        if [[ $PID > 0 ]]; then
            if ps $PID | grep -q "$CMD"; then
                echo "Running as pid $PID."
            else
                echo "Not running, even though $(cd $(dirname $PID_FILE); echo -n $(pwd)/$(basename $PID_FILE)) suggests pid $PID."
            fi
        else
            echo "Not running."
        fi
        ;;
    *)
        usage;;
esac