def fetch
      log.info(log_key) { "Copying from `#{source_file}'" }

      create_required_directories
      FileUtils.cp(source_file, target_file)
      # Reset target shasum on every fetch
      @target_shasum = nil
      target_shasum
    end
def fetch
      log.info(log_key) { "Copying from `#{source_file}'" }

      create_required_directories
      FileUtils.cp(source_file, target_file)
      # Reset target shasum on every fetch
      @target_shasum = nil
      target_shasum
    end
Fetch any new files by copying them to the +project_dir+.

 @return [void]