[FreeNX-kNX] LTSP Startup Script

[Dimitar Paskov]

На 5.10.2007 18:26 Terje Andersen пише:
> On Fri, 2007-10-05 at 10:17 -0500, Joe Baker wrote:
> > Dimitar Paskov wrote:
> > >> It would be great if we could get some GPLed nx client and startup
> > >> script added to the LTSP project.
> > >
> > > I have some ltsp scripts to start nxclient with an ltsp terminal. If
> > > you are interested I can send them to you.
> >
> > Yes, please send the script.  I do not mind running nxclient here on our
> > LAN for the time being.
> >
> > Thank You!
>
> Dimitar, it would be nice if you could post them to the list, I'm sure
> more then one could have use for them (including me :p).
>

I'm using ltsp under Ubuntu 6.06 and the script that starts xdm/gdm/telnet or 
whatever it is installed on the thin client environment 
is /etc/init.d/ltsp-client. The script executes another scripts that are 
located in /usr/lib/ltsp/screen.d/ and they are defined in the 
file /etc/lts.conf as SCREEN_01, SCREEN_02, etc. For example if I put 
SCREEN_01=telnet in /etc/lts.conf it will 
execute /usr/lib/ltsp/screen.d/telnet. So I made a script called "nx" and 
place it in /usr/lib/ltsp/screen.d/ and assign it in /etc/lts.conf -> 
SCREEN_01=nx. The script is divided in 3 parts for convenience:

/usr/lib/ltsp/screen.d/nx:
-------------------------------------
#!/bin/sh
while true; do
        /usr/bin/xinit /usr/lib/ltsp/start_nx -- :0 vt2
        sleep 1
done
-------------------------------------
This fires up X on tty2 and starts /usr/lib/ltsp/start_nx (the second script):
-------------------------------------
#!/bin/sh
# set the background
/usr/bin/xsetroot -solid black

# set some variables
export NXDIR=/usr/NX
export HOME=/root

# start the window manager
ion &

# start nxclient
/usr/bin/runnxclient
-------------------------------------
Here I set the background and some variables, start a minimal window manager 
(more on that later) and finally execute the 3rd script that actually starts 
nxclient (/usr/bin/runnxclient):
-------------------------------------
#!/bin/sh

while true; do
	# start nx client with predefined session
    	/usr/NX/bin/nxclient --config /etc/ltsp/nx/config/nxclient.conf --session /etc/ltsp/nx/config/linux.nxs
        # sleep until nxclient(nxssh) is running
        while (ps -C nxssh > /dev/null); do
                sleep 1
        done
done
-----------------------------------
I make a loop that restarts nxcleint whenever it stops running. Actually 
nxclient as a process finishes as long as the user logs in and is replaced by 
nxssh so I wait until it exits. I start nxclient with a predefined session 
and a little trick that forbids the user to change parameters on the client - 
I create empty files in /usr/NX/share/: noconfig  nopasswd. This is optional 
of course.

You can skip some of the scripts if you don't need them for example you can 
skip the second script that actually only starts a window manager ... you can 
go without a window manager but then there is a little problem that I 
couldn't solve: the key repeat rate is disabled unless nxclient is executed 
under some window manager. I didn't have time to dig into it so if you find a 
solution please tell me ;) The window manager (ion2) is very minimal and 
displays only a top frame on the login screen with nxclient. After nxclient 
passes login and opens the session, that frame disappears (it goes to 
full-screen mode) and the user don't know that they work under terminal 
session at all :)

I hope this helps and if you have any questions don't hesitate to ask :)

ps: I use nxclient 1.5 version