code: def explicit_images(images, image_destination, rootname, config):
      
      log.info('Explicit image directory specified: {0}'.format(images))
      if '*' in images:
          images = images.replace('*', rootname)
          log.debug('Wildcard expansion for image directory: {0}'.format(images))
      try:
          shutil.copytree(images, image_destination)
      except:
          #The following is basically a recipe for log.exception() but with a
          #CRITICAL level if the execution should be killed immediately
          #log.critical('Unable to copy from indicated directory', exc_info=True)
          log.exception('Unable to copy from indicated directory')
          return False
      else:
          return True
docs: The method used to handle an explicitly defined image directory by the
      user as a parsed argument.