docs: def dependency_images(self, for_running=False):
          """
          What images does this one require
  
          Taking into account parent image, and those in link and volumes.share_with options
          """
          candidates = []
          detach = dict((candidate, not options.attached) for candidate, options in self.dependency_options.items())
  
          for link in self.links:
              if link.container:
                  candidates.append(link.container.name)
  
          if not for_running:
              for content, _ in self.commands.extra_context:
                  if type(content) is dict or (hasattr(content, "is_dict") and content.is_dict) and "image" in content:
                      if not isinstance(content["image"], six.string_types):
                          candidates.append(content["image"].name)
  
          candidates.extend(list(self.shared_volume_containers()))
  
          done = []
          for candidate in candidates:
              if candidate not in done:
                  done.append(candidate)
                  yield candidate, detach.get(candidate, True)