Daemonize celery flower by `start-stop-daemon`, in pipenv's virtualenv

celery_flowerd.sh

#!/bin/bash

NAME=flowerd
DESC="flower daemon"

PIDFILE=./$NAME.pid

PIPENV_VENV_PATH=`pipenv --venv`

FLOWER="$PIPENV_VENV_PATH/bin/celery flower"
FLOWER_OPTS="--broker=redis://localhost:6379/15 --port=5566"
DAEMON=$FLOWER

set -e

case "$1" in
    start)
        echo -n "Starting $DESC: "

        # For Busybox/Termux version
        # start-stop-daemon -S -b -p $PIDFILE \
        #   -m \
        #   -x $DAEMON -- $FLOWER_OPTS

        start-stop-daemon --start --background --pidfile $PIDFILE \
            --make-pidfile \
            --exec $DAEMON -- $FLOWER_OPTS
        echo "$NAME."
        ;;

    stop)
        echo -n "Stopping $DESC: "
        
        # For Busybox/Termux version
        # start-stop-daemon -K -q -o -p $PIDFILE

        start-stop-daemon --stop --quiet --oknodo --pidfile $PIDFILE
        rm -f $PIDFILE
        echo "$NAME."
        ;;

    *)
        echo "Usage: "$1" {start|stop}"
	    exit 1
esac

exit 0