def upgrade_v1_dotfile(path)
      @logger.info("Upgrading V1 dotfile to V2 directory structure...")

      # First, verify the file isn't empty. If it is an empty file, we
      # just delete it and go on with life.
      contents = path.read.strip
      if contents.strip == ""
        @logger.info("V1 dotfile was empty. Removing and moving on.")
        path.delete
        return
      end

      # Otherwise, verify there is valid JSON in here since a Vagrant
      # environment would always ensure valid JSON. This is a sanity check
      # to make sure we don't nuke a dotfile that is not ours...
      @logger.debug("Attempting to parse JSON of V1 file")
      json_data = nil
      begin
        json_data = JSON.parse(contents)
        @logger.debug("JSON parsed successfully. Things are okay.")
      rescue JSON::ParserError
        # The file could've been tampered with since Vagrant 1.0.x is
        # supposed to ensure that the contents are valid JSON. Show an error.
        raise Errors::DotfileUpgradeJSONError,
          state_file: path.to_s
      end

      # Alright, let's upgrade this guy to the new structure. Start by
      # backing up the old dotfile.
      backup_file = path.dirname.join(".vagrant.v1.#{Time.now.to_i}")
      @logger.info("Renaming old dotfile to: #{backup_file}")
      path.rename(backup_file)

      # Now, we create the actual local data directory. This should succeed
      # this time since we renamed the old conflicting V1.
      setup_local_data_path(true)

      if json_data["active"]
        @logger.debug("Upgrading to V2 style for each active VM")
        json_data["active"].each do |name, id|
          @logger.info("Upgrading dotfile: #{name} (#{id})")

          # Create the machine configuration directory
          directory = @local_data_path.join("machines/#{name}/virtualbox")
          FileUtils.mkdir_p(directory)

          # Write the ID file
          directory.join("id").open("w+") do |f|
            f.write(id)
          end
        end
      end

      # Upgrade complete! Let the user know
      @ui.info(I18n.t("vagrant.general.upgraded_v1_dotfile",
                      backup_path: backup_file.to_s))
    end
def upgrade_v1_dotfile(path)
      @logger.info("Upgrading V1 dotfile to V2 directory structure...")

      # First, verify the file isn't empty. If it is an empty file, we
      # just delete it and go on with life.
      contents = path.read.strip
      if contents.strip == ""
        @logger.info("V1 dotfile was empty. Removing and moving on.")
        path.delete
        return
      end

      # Otherwise, verify there is valid JSON in here since a Vagrant
      # environment would always ensure valid JSON. This is a sanity check
      # to make sure we don't nuke a dotfile that is not ours...
      @logger.debug("Attempting to parse JSON of V1 file")
      json_data = nil
      begin
        json_data = JSON.parse(contents)
        @logger.debug("JSON parsed successfully. Things are okay.")
      rescue JSON::ParserError
        # The file could've been tampered with since Vagrant 1.0.x is
        # supposed to ensure that the contents are valid JSON. Show an error.
        raise Errors::DotfileUpgradeJSONError,
          state_file: path.to_s
      end

      # Alright, let's upgrade this guy to the new structure. Start by
      # backing up the old dotfile.
      backup_file = path.dirname.join(".vagrant.v1.#{Time.now.to_i}")
      @logger.info("Renaming old dotfile to: #{backup_file}")
      path.rename(backup_file)

      # Now, we create the actual local data directory. This should succeed
      # this time since we renamed the old conflicting V1.
      setup_local_data_path(true)

      if json_data["active"]
        @logger.debug("Upgrading to V2 style for each active VM")
        json_data["active"].each do |name, id|
          @logger.info("Upgrading dotfile: #{name} (#{id})")

          # Create the machine configuration directory
          directory = @local_data_path.join("machines/#{name}/virtualbox")
          FileUtils.mkdir_p(directory)

          # Write the ID file
          directory.join("id").open("w+") do |f|
            f.write(id)
          end
        end
      end

      # Upgrade complete! Let the user know
      @ui.info(I18n.t("vagrant.general.upgraded_v1_dotfile",
                      backup_path: backup_file.to_s))
    end
This upgrades a Vagrant 1.0.x "dotfile" to the new V2 format.

 This is a destructive process. Once the upgrade is complete, the
 old dotfile is removed, and the environment becomes incompatible for
 Vagrant 1.0 environments.

 @param [Pathname] path The path to the dotfile