Daemon wrapper for hubot written in bash

hubot.sh

#!/bin/bash
set -e

# detect our real working directory through symlinks
SOURCE="${BASH_SOURCE[0]}"
while [ -h "$SOURCE" ]; do # resolve $SOURCE until the file is no longer a symlink
DIR="$( cd -P "$( dirname "$SOURCE" )" && pwd )"
SOURCE="$(readlink "$SOURCE")"
[[ $SOURCE != /* ]] && SOURCE="$DIR/$SOURCE" # if $SOURCE was a relative symlink, we need to resolve it relative to the path where the symlink file was located
done
DIR="$( cd -P "$( dirname "$SOURCE" )" && pwd )"

# set out working directory
cd "$DIR/.."

pidfile="bin/hubot.pid"

me="$(basename "$(test -L "$0" && readlink "$0" || echo "$0")")"

PACKAGE_VERSION=$(cat package.json \
  | grep version \
  | head -1 \
  | awk -F: '{ print $2 }' \
  | sed 's/[",]//g')

usage() { echo "Usage: $me [status|start|reload|stop]" 1>&2; exit 1; }

function loadenv() {
    if [ -f ".env" ]
    then 
        envtype=$(cat .env)
        envfile="conf/$envtype"

        if [ -f $envfile ]
        then
            . $envfile
            echo "Loaded environment from $envfile" 
        else
            echo "$envfile not found."
        fi
    else
        echo 'Environment type definition not found. Attempting production.'
        if [ -f 'conf/production' ]
        then
            . conf/production
        else 
            echo 'Production environment definition not found.'
        fi
    fi
}

function status {
    if [ -f $pidfile ]
    then 
        PID=`cat $pidfile`
        if ps -p $PID > /dev/null
        then
            echo "hubot is running on $PID"
        else
            echo 'hubot is not running'
        fi
    else
        echo 'PID file not found.'
    fi
}

function stop {
    echo 'Stopping hubot'
    PID=`cat $pidfile`

    if ps -p $PID > /dev/null
    then
        kill `cat $pidfile`
    fi
    rm $pidfile
}

function start() {
    loadenv
    executable='node_modules/.bin/hubot -d --name "hubot" -a slack "$@"'
    log="log/hubot.log"

    if [ -f $pidfile ]; then 
        echo "PID file found: " && cat $pidfile && exit 0
    fi

    daemon() {
        echo 'Starting hubot'
        $executable >> $log 2>&1 &
        pid="$!"
        echo $pid > $pidfile
    }

    npm install --no-save
    export PATH="node_modules/.bin:node_modules/hubot/node_modules/.bin:$PATH"

    daemon
}



while :; do
    case $1 in
        status)
            status
            break;
        ;;
        start)
            start
            break
        ;;
        reload)
            stop
            start
            break
        ;;
        stop)
            stop
            break
        ;;
        -h|-\?|--help)
            usage
            break
        ;;
        -v|--version)
            echo $PACKAGE_VERSION
            exit 1;
        ;;
        *)
            usage
            break
        ;;
    esac
    shift
done