Deciding what packages to put on an install CD

[Bruce Edge]

I want to grab all specified and dependant packages from the package lists in package_config/* to put on the install CD.
This would allow one to install any of the same classes supported by the regular FAI install.
How can I generate a list of all the dependant packages?
ie: a list of all the packages that the specified packages in package_config/* depend on?

Thanks, Bruce