REPOSITORY file at the top-level of a
  CRAN-style repository.  This file is DCF formatted and describes the
  location of packages available in the repository.  Here is an example
  for a repository containing only source and Windows binary packages:
    source: src/contrib
    win.binary: bin/windows/contrib/2.6
    win64.binary: bin/windows64/contrib/2.6
    mac.binary.leopard: bin/mac/leopard/contrib/2.6
    provides: source, win.binary, win64.binary, mac.binary.leopard
  
write_REPOSITORY(reposRootPath, 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,
  genReposControlFiles,
  write_VIEWS