Пример #1
0
// pruneImages invokes imagePruneFunc with each image that is prunable, along
// with the image streams that reference the image. After imagePruneFunc is
// invoked, the image node is removed from the graph, so that layers eligible
// for pruning may later be identified.
func pruneImages(g graph.Graph, imageNodes []*graph.ImageNode, pruneImage ImagePruneFunc, pruneStream ImageStreamPruneFunc, pruneManifest ManifestPruneFunc) {
	for _, imageNode := range imageNodes {
		glog.V(4).Infof("Examining image %q", imageNode.Image.Name)

		if !imageIsPrunable(g, imageNode) {
			glog.V(4).Infof("Image has strong references - not pruning")
			continue
		}

		glog.V(4).Infof("Image has only weak references - pruning")

		if err := pruneImage(imageNode.Image); err != nil {
			util.HandleError(fmt.Errorf("error pruning image %q: %v", imageNode.Image.Name, err))
		}

		for _, n := range g.Predecessors(imageNode) {
			if streamNode, ok := n.(*graph.ImageStreamNode); ok {
				stream := streamNode.ImageStream
				repoName := fmt.Sprintf("%s/%s", stream.Namespace, stream.Name)

				glog.V(4).Infof("Pruning image from stream %s", repoName)
				updatedStream, err := pruneStream(stream, imageNode.Image)
				if err != nil {
					util.HandleError(fmt.Errorf("error pruning image from stream: %v", err))
					continue
				}

				streamNode.ImageStream = updatedStream

				ref, err := imageapi.DockerImageReferenceForStream(stream)
				if err != nil {
					util.HandleError(fmt.Errorf("error constructing DockerImageReference for %q: %v", repoName, err))
					continue
				}

				glog.V(4).Infof("Invoking pruneManifest for registry %q, repo %q, image %q", ref.Registry, repoName, imageNode.Image.Name)
				if err := pruneManifest(ref.Registry, repoName, imageNode.Image.Name); err != nil {
					util.HandleError(fmt.Errorf("error pruning manifest for registry %q, repo %q, image %q: %v", ref.Registry, repoName, imageNode.Image.Name, err))
				}
			}
		}

		// remove pruned image node from graph, for layer pruning later
		g.RemoveNode(imageNode)
	}
}