[PLUG] Writing a script for use with LTSP...

[robinsoq]

I've switched to dhcp 3 to get booting with PXE 
enabled cards to work.  Presto. Trouble is, 
the old bootp menu scheme I had with the whole 
option-128, etc. under dhcp 2 doesn't work in 
release 3 :-(  Figuring I have a Linux terminal 
boot anyways I've come up with the idea of 
using this system to select which system to 
boot at startup.  To that end I've programmed 
cron to reset links for all my terminals to the 
LTSP boot image every twenty images assuming 
those links could point to say a dos image or 
something else.  

The reasoning for using the LTSP 
system to choose the boot image is twofold:  
You have to authenticate through Linux login 
which is going to be familiar territory and
is also security conscious, I don't have to 
do weird things with the dhcp configuration 
other than restart dhcp every time there is 
a link change for a boot option.

So far I'm stumped: my current bash script is at 

ftp://ftp.robinson-west.com/linux/net-image.bash.

My script need this in short:

  1)  Who is executing me to
      determine their boot
      options.

  2)  From which terminal am
      I being called to choose
      the right link to modify.

  3)  The ability to perform the
      root task of changing the
      boot link for an ordinary 
      user without that user 
      entering the root password.

  4)  An init script to call 
      that will restart 
      dhcp after the links 
      are redone.

  *)  Admin is special and can 
      change any terminals' 
      boot option to any boot 
      image including 
      installation images.

I'm guessing this script needs 
suid bits?

In a test I manually changed a
terminal's link and restarted
dhcp which did change it's boot.
Twenty minutes later simply 
restarting dhcp thanks to my
current root owned cron job
that resets all links I put
that terminal back to LTSP.