Unusual login requirement

[Doug Hardie]

I am trying to figure out how to implement an unusual login requirement 
and haven't found a good approach yet.  What I need is to have a 
specific user id that when it is logged in it executes a specific 
script and then immediately logs out.  Basically what it needs to do is 
run a make that builds a CD from a bunch of files and then burns the 
CD.  Obviously a blank CD would need to be in the burner first.  I 
don't want a general login as this would be used by a person who should 
not have access to the system.  I just need him to be able to burn a CD 
frequently.

My first throught was to create a script and set it as the shell in the 
passwd file and add it to /etc/shells.  Is that the best approach?  I 
am not concerned about the user breaking out of the script as he is 
trusted.  I just don't want to create a regular user account for him.  
The server is running FreeBSD 4.6.  Thanks,

-- Doug