[Haskell-cafe] server directory layout for cabal-install?

Hello. I wonder what is the required layout of directories and files on a server that supplies packages for cabal-install. I figure 00-index.tar.gz contains the *.cabal files. (The cabal files have to be on the server as well, unpacked?) Each $dir/$foo.cabal (in the archive) contains a "Version:$ver" line, and then $dir/$foo-$ver.tar.gz must be on the server? Are there additional constraints on the $dir part? What is the syntax of the .cabal/config file? The standard entry is repos: hackage.haskell.org:http://hackage.haskell.org/packages/archive , where the thing between "repos:" and ":http" is just a symbolic name, and I can add more lines like that? Thanks, J.W.