You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: flavor.rb
    path of file: ./repos/vagrant/plugins/guests/centos/cap
    
    the code of the file until where you have to start completion: # Copyright (c) HashiCorp, Inc.
# SPDX-License-Identifier: BUSL-1.1

module VagrantPlugins
  module GuestCentos
    module Cap
      class Flavor
        def self.flavor(machine)
          # Pick up version info from `/etc/os-release`. This file started to exist
          # in CentOS 7. For versions before that (i.e. CentOS 6) just plain `:centos`
          # should do.
          version = nil
          if machine.communicate.test("test
    
        def self.flavor(machine)
          # Pick up version info from `/etc/os-release`. This file started to exist
          # in CentOS 7. For versions before that (i.e. CentOS 6) just plain `:centos`
          # should do.
          version = nil
          if machine.communicate.test("test -f /etc/os-release")
            begin
              machine.communicate.execute("source /etc/os-release && printf $VERSION_ID") do |type, data|
                if type == :stdout
                  version = data.split(".").first.to_i
                end
              end
            rescue
            end