Starts/stops a python script, storing its PID in /var/run, so that it can be run from monit

startpy

#!/bin/bash
#
# startpy: starts/stops a python script, storing its PID in /var/run,
#          so that it can be run from monit
#
# Scripts must be placed in a folder under /home/sm/scripts. Startpy
# will look in that folder for a script named after the folder (plus
# .py extension).
# 
# (In the following example we'll assume a script test.py exists in
# /home/sm/scripts/test
#
# 1) Start the script
#         $ startpy start test
# 2) Start the script from a python environment located at
#    /home/sm/scripts/test/env
#         $ startpy -e start test
#
# (Upon successful start, the PID for the process will be stored in
# /var/run/sm/test.pid. Make sure the user executing startpy can 
# write in that directory.)
#
# 3) Stop the script
#         $ startpy stop test

while getopts ":e" opt; do
    case $opt in
        e)
            USE_ENV=true
            shift
            ;;
        \?)
            echo "Invalid option: -$OPTARG" >&2
            exit 1
            ;;
    esac
done

case $1 in
    start)
        if [ -z "$2" ]; then
            echo "No script name was supplied."
            exit 1
        fi

        SCRIPT_HOME=/home/sm/scripts/$2

        if [ -n "$USE_ENV" ]; then
            source ${SCRIPT_HOME%%/}/env/bin/activate
        fi

        echo $$ > /var/run/sm/$2.pid;
        exec 2>&1 python ${SCRIPT_HOME%%/}/$2.py
        ;;
    stop)  
        kill `cat /var/run/sm/$2.pid`
        ;;
    *)  
        echo "Usage: startpy [-e] {start|stop} script_name"
        ;;
esac