Creating complete repository

Hello.

I am new to yum, so forgive me if I have missed something obvious.

I need to create an installation DVD with a complete set of RPMs to install
on a system.  The key problem is that the system does not have internet
access, so the DVD must contain all the RPMs required with no missing
dependencies.

I've seen articles on how to create a repository using a DVD, but what I am
doing is different - I am creating the DVD that will be used to install all
the software.  It will be installed with anaconda, not yum.  The problem I
have is identifying all the RPMs to put on the DVD.

What I would like to do is use yum to identify all the RPMs I need to copy
to my DVD.  The things I will have before I start are:

   - A small set of application RPMs
   - A few OS RPMs (CentOS)

The only way I can think of doing it is to:

   1. Start with my set of application and OS packages/RPMs
   2. For each package:
      1. Run "yum deplist" on each one to get the set of providers
      2. For each dependency:
         1. If the dependency is not satisfied by one of the packages, then
         add one of the providers of this dependency to our list of packages

However, this is not something I want to be doing by hand since it could
take a long time.  Also, I will need to repeat this process every release.
Thus, I would like to automate this, but when a dependency is provided by
multiple providers, it will be difficult to write a program to decide which
one to choose.

While thinking on this problem, I realized that yum must already do this to
some extent.  After all, when you need to install a new package, yum will
find all the dependencies and get the packages that provide them
automatically.

So is there some way for me to get the complete list?  The system I am
creating this list on already has many packages installed, so using the
"downloadonly" plugin won't work since it will skip any packages already
installed, and I need to get all the packages even if they are currently
installed.

Thanks!!

Chris

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