Init script for a program that runs in a screen session

init-script-screen.sh

#!/bin/sh
### BEGIN INIT INFO
# Provides:          some-program
# Required-Start:    $remote_fs $syslog
# Required-Stop:     $remote_fs $syslog
# Default-Start:     2 3 4 5
# Default-Stop:      0 1 6
# Short-Description: Some Program
### END INIT INFO

PATH="/sbin:/usr/sbin:/bin:/usr/bin"
PATH="/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin"
NAME="some-program"
DESC="Some Program"
LOG_FILE=/var/log/some-program-run.log

. /lib/lsb/init-functions

start_some_program()
{
    /usr/bin/screen -S some-program -d -m /bin/bash -c "while true; do /opt/bin/some-program >> ${LOG_FILE} 2>&1; done"
}

stop_some_program()
{
    # check if a screen session exists
    SESSION_EXISTS=$(/usr/bin/screen -S some-program -Q 'select .' >/dev/null; echo $?)
    if [ ${SESSION_EXISTS} -eq 0 ]; then
        /usr/bin/screen -S some-program -X quit >> ${LOG_FILE} 2>&1
    fi
}

case "$1" in
start)
        echo "Starting ${DESC}"
        start_some_program
        ;;
stop)
        echo "Stopping ${DESC}"
        stop_some_program
        ;;
restart|force-reload)
        echo "Restarting ${DESC}"
        stop_some_program
        case "$?" in
        0|1)
                start_some_program
                ;;
        *)
                echo "Failed to stop ${DESC}" >> ${LOG_FILE} 2>&1
                exit 1
                ;;
        esac
        ;;
*)
        echo "Usage: /etc/init.d/${NAME} {start|stop|force-reload|restart}" >&2
        exit 1
        ;;
esac