code: public Path.Root getRepositoryRoot() throws IOException {
  		Path.Root root = environment.getGlobalRoot().createRelativeRoot(REPOSITORY_PATH);
  		// TODO: create repository if it doesn't exist.
  		return root;
  	}
docs: Get the root of the package repository. This is the global directory in which
  all installed packages are found.
  
  @return
  @throws IOException