JDownloader quick howto

Technically, this isn't an addon, but since it's about an app that's been requested several times as an addon, I figure this post has its place here.

Since JDownloader isn't yet a client/server app (it's in their todo list), and since I haven't found any serious alternatives (Tucan's CLI isn't quite up to speed yet, and development seems at best very slow), I decided to run JDownloader directly on my Ultra 4. The general idea is to install java on the readynas, then run jdownloader in a virtual X11 environment using xvfb to minimize required resources. Here's a quick'n'dirty rundown on how to get it to work, with no warranties whatsoever. Whatever you do, you do at your own risk!

- enable root ssh access to the readynas (warning : support can refuse to help you if you've enabled root access to the nas), using the EnableRootSSH plugin (http://www.readynas.com/?p=4203)
- login as root via ssh on the nas
- add the following line to /etc/apt/sources.list (thanks to this post : viewtopic.php?f=35&t=45891&start=0) :

deb http://archive.ubuntu.com/ubuntu dapper-backports main multiverse

- set debconf to run interactively by running the following command and then selecting "readline" :

dpkg-reconfigure debconf

- install java 6 :

apt-get update
apt-get install sun-java6-jre sun-java6-jdk

- once this is over, return debconf to non-interactive mode :

dpkg-reconfigure debconf

- install xvfb if it isn't installed already (can't remember whether it was already there) :

apt-get install xvfb

- add a few necessary libs to avoid grief later on

apt-get install libxtst6 libxi6

- download the official jdownloader install script from here : http://212.117.163.148/jd.sh (or see direct link here : http://jdownloader.org/download/index)
- set up a X11 server on your PC so that you can export your display (Linux : it's already there, MacOS : X11 included on the second DVD IIRC, Windows : download Xming from here : http://sourceforge.net/projects/xming/)
- on the readynas, export your display and run the jd.sh script :

export DISPLAY=your.pc.ip.address:0
chmod 755 jd.sh
./jd.sh

- JDownloader will then be downloaded, installed and updated on your NAS. You should get the window on your PC's X display
- in JDownloader's settings, activate the JDWebInterface plugin and configure it (I suggest SSL and a robust password if you intend to make that interface visible from the outside)
- in JDownloader's settings, click the checkboxes for the TOS for all the file hosters (since we'll be running it headless, we won't be able to validate the TOS directly)
- check that you can connect through your browser
- edit the jd.sh script and replace all 512m entries by 128m, as we don't want it eating too much memory (simple replace with vi : ":%s/512m/128m/g")
- run the jd.sh script through xvfb:

nohup xvfb-run ./jd.sh &

The last step is to setup jdownloader to restart when the nas reboots, which can be accomplished easily by setting a startup script in /etc/rc3.d (and which I'll have to do ASAP).

I'll try to answer questions in this thread if you have any.