contribPaths a PACKAGES file
  is written.  In addition, two top-level control files are created:  REPOSITORY contains information about the specified contrib
  paths.
  VIEWS contains metadata for all packages in the repository
  including the paths to any extracted vignettes, if found.  This file
  is useful for generating HTML views of the repository.
genReposControlFiles(reposRoot, contribPaths)source, win.binary, win64.binary,
    mac.binary, and mac.binary.leopard.
    Values indicate the paths to the package archives relative to
    the reposRoot.write_PACKAGES,
  extractVignettes,
  write_REPOSITORY,
  write_VIEWS