# File lib/vagrant-lxc/action/handle_box_metadata.rb, line 74
        def validate_box
          unless SUPPORTED_VERSIONS.include? box_version
            raise Errors::IncompatibleBox.new name: @box.name,
                                              found: box_version,
                                              supported: SUPPORTED_VERSIONS.join(', ')
          end

          unless File.exists?(template_src)
            raise Errors::TemplateFileMissing.new name: @box.name
          end

          unless File.exists?(rootfs_tarball)
            raise Errors::RootFSTarballMissing.new name: @box.name
          end
        end