# File install.rb, line 22
def cvs_files(dir)
  return CVS_FILES[dir] if CVS_FILES.include? dir
  if File.directory? "#{dir}/CVS"
    result = {}
    File.foreach("#{dir}/CVS/Entries") {|line|
      case line
      when %r{\A/([^/]+)/} then result[$1] = true
      when %r{\AD/([^/]+)/} then result[$1] = true
      end
    }
  else
    result = nil
  end
  CVS_FILES[dir] = result
  result
end