what (.deb) packages need for installer except .udeb packages ?

[kin boster <kinboster@gmail.com>]

hi all:
       what (.deb) packages need for installer except .udeb packages ?

            in debian installer (lenny), some packages is a hard code write in it, and hard to find it out
       like base-files, perl-base, glibc, linux-image, etc
            and some packages are need to use in the installation progress, like:
       chroot /target apt-cache search '^(kernel|linux)-image'  ( need apt-utils package ) etc  and 
       apt-install mdadm (need mdadm package)  etc.
   
           so d-i must dependency these packages to finish during installation progress, 
       or may have something wrong in installtaion or after installation.
       is there any documentation mention these packages ?
       or how can I find out all of these package?

Best regards

Boster