local mirror based on APT source.list format?

["Daniel B." <dsb@smart.net>]

For maintaining a local partial Debian mirror, is there any tool 
that takes an APT-style sources.list file as the specification of 
things to mirror?

And does it download packages _before_ you decide to install them
(as opposed to archiving packages after downloading them on demand)?


What I'd like to have it this:
- I specify what to mirror using a list of lines like in sources.list,
  allowing combinations such as:
  - woody
  - testing (sharing pool subdirectories/files with woody)
  - the Gnome2 backport to woody
- A cron job updates my local mirror.
- When I decide to install a package, APT installs from the local
  mirror.



Thanks,
Daniel
-- 
Daniel Barclay
dsb@smart.net