Installs Bittorrent Sync (btsync) under a FreeNAS jail

#!/bin/sh
# Installs Bittorrent Sync (btsync) under a FreeNAS jail
# http://forums.freenas.org/threads/bittorrent-sync-install.12722/
# 2013-08-20

cd /tmp

echo -n "Would you like to install Bittorrent Sync (y/n)? [n] : "
read install_btsync

if [ $install_btsync = "y" ]; then
    echo "Initialization of btsync user"
    if [ `more /etc/passwd | grep btsync | wc -l` -gt 0 ]; then
        echo "The btsync user already exists"
    else
        echo "Creation of btsync user"
        pw useradd btsync -m -c "User Bittorrent Sync" -s /bin/sh -w yes
    fi

    echo "Initialization of directory"
    home_dir="/home/btsync"
    config_dir="$home_dir/.config"
    config_btsync_dir="$config_dir/btsync"

    if [ ! -e $config_dir ]; then
        mkdir $config_dir
    fi
    if [ ! -e $config_btsync_dir ]; then
        mkdir $config_btsync_dir
    fi
    chown -R btsync $home_dir
    chmod -R 744 $home_dir

    if [ ! -e btsync_freebsd_x64.tar.gz ]; then
        echo "Downloading Bittorrent Sync."
        fetch "http://btsync.s3-website-us-east-1.amazonaws.com/btsync_freebsd_x64.tar.gz"
    fi
    if [ -e btsync ]; then
        rm btsync
    fi
    echo "Extraction of Bittorrent Sync."
    tar xvfz btsync_freebsd_x64.tar.gz
    echo "Copying Bittorrent Sync."
    cp btsync /usr/local/sbin/btsync
    chmod 755 /usr/local/sbin/btsync

    echo "Initialization of the daemon...ROAR"
    cat > "/etc/rc.d/btsync" <<EOF
#!/bin/sh

# PROVIDE: btsync
# REQUIRE: NETWORKING SERVERS DAEMON ldconfig resolv

# btsync service
# Take from <https://gist.github.com/MendelGusmao/5398362>
# Replace with linux users you want to run BTSync clients for

BTSYNC_USERS="btsync"
DAEMON=/usr/local/sbin/btsync

name="btsync"
rcvar="btsync_enable"
command="/usr/local/sbin/\${name}"

start() {
    echo "Starting btsync..."
        for btsuser in \$BTSYNC_USERS; do
            echo " - for \$btsuser"
            HOMEDIR=\`getent passwd \$btsuser | cut -d: -f6\`
            if [ -d \$HOMEDIR/.config ]; then
                su -l \$btsuser -c "\$command --config \$HOMEDIR/.config/btsync/config.json"
            fi
        done
}

stop() {
    echo "Stopping btsync..."
    for btsuser in \$BTSYNC_USERS; do
        HOMEDIR=\`getent passwd \$btsuser | cut -d: -f6\`
        if [ -d \$HOMEDIR/.config ]; then
            dbpid=\`pgrep -u \$btsuser btsync\`
            if [ -z "\$dbpid" ]; then
                echo "btsync for USER \$btsuser: not running."
            else
                echo "Stopping btsync for USER \$btsuser: running (pid \$dbpid)"
                kill \$dbpid
                until [ -z "\$dbpid" ]
                do
                    dbpid=\`pgrep -u \$btsuser btsync\`
                    echo -n "."
                    sleep 1
                done
                echo ""
            fi
        fi
    done
}

status() {
    for btsuser in \$BTSYNC_USERS; do
        dbpid=\`pgrep -u $btsuser btsync\`
        if [ -z "\$dbpid" ]; then
            echo "btsync for USER \$btsuser: not running."
        else
            echo "btsync for USER \$btsuser: running (pid \$dbpid)"
        fi
    done
}

case "\$1" in
    start)
        start
        ;;
    stop)
        stop
        ;;
    restart|reload|force-reload)
        stop
        start
        ;;
    status)
        status
    ;;
    *)
        echo "Usage: /etc/rc.d/btsync {start|stop|reload|force-reload|restart|status}"
        exit 1
esac
exit 0

EOF
    chmod 755 /etc/rc.d/btsync

    if [ `more /etc/rc.conf | grep btsync | wc -l` -lt 1 ]; then
        echo "btsync_enable=\"YES\"" >> /etc/rc.conf
    fi

    echo "Web Interface configuration"
    echo -n "User login to the web interface : "
    read user
    echo -n "Password to connect to the web interface : "
    read pwd

    cat > "$config_btsync_dir/config.json" <<EOF
{
    "device_name": "Freenas",
    "listening_port" : 0, // 0 - randomize port

    /* storage_path dir contains auxilliary app files
       if no storage_path field: .sync dir created in the directory
       where binary is located.
       otherwise user-defined directory will be used
     */
    "storage_path" : "/home/btsync/.config/btsync",

    // uncomment next line if you want to set location of pid file
    // "pid_file" : "/var/run/syncapp/syncapp.pid",

    "check_for_updates" : true,
    "use_upnp" : true,                              // use UPnP for port mapping

    /* limits in kB/s
       0 - no limit
     */
    "download_limit" : 0,
    "upload_limit" : 0,

    /* remove "listen" field to disable WebUI
       remove "login" and "password" fields to disable credentials check
     */
    "webui" :
    {
        "listen" : "0.0.0.0:8888",
        "login" : "$user",
        "password" : "$pwd"
    }

}
EOF
    chown btsync $config_btsync_dir/config.json
    chmod 744 $config_btsync_dir/config.json

    echo "Launching btsync :"
    /etc/rc.d/btsync start
fi