Golang types.NewHash函数代码示例

// findImage will recognize a ACI hash and use that, import a local file, use
// discovery or download an ACI directly.
func (f *finder) findImage(img string, asc string, discover bool) (*types.Hash, error) {
	// check if it is a valid hash, if so let it pass through
	h, err := types.NewHash(img)
	if err == nil {
		fullKey, err := f.s.ResolveKey(img)
		if err != nil {
			return nil, fmt.Errorf("could not resolve key: %v", err)
		}
		h, err = types.NewHash(fullKey)
		if err != nil {
			// should never happen
			panic(err)
		}
		return h, nil
	}

	// try fetching the image, potentially remotely
	ft := &fetcher{
		imageActionData: f.imageActionData,
		local:           f.local,
		withDeps:        f.withDeps,
	}
	key, err := ft.fetchImage(img, asc, discover)
	if err != nil {
		return nil, err
	}
	h, err = types.NewHash(key)
	if err != nil {
		// should never happen
		panic(err)
	}

	return h, nil
}

// getAppImageID returns the image id to enter
// If one was supplied in the flags then it's simply returned
// If the PM contains a single image, that image's id is returned
// If the PM has multiple images, the ids and names are printed and an error is returned
func getAppImageID(p *pod) (*types.Hash, error) {
	if flagAppImageID != "" {
		return types.NewHash(flagAppImageID)
	}

	// figure out the image id, or show a list if multiple are present
	b, err := ioutil.ReadFile(common.PodManifestPath(p.path()))
	if err != nil {
		return nil, fmt.Errorf("error reading pod manifest: %v", err)
	}

	m := schema.PodManifest{}
	if err = m.UnmarshalJSON(b); err != nil {
		return nil, fmt.Errorf("unable to load manifest: %v", err)
	}

	switch len(m.Apps) {
	case 0:
		return nil, fmt.Errorf("pod contains zero apps")
	case 1:
		return &m.Apps[0].Image.ID, nil
	default:
	}

	stderr("Pod contains multiple apps:")
	for _, ra := range m.Apps {
		stderr("\t%s: %s", types.ShortHash(ra.Image.ID.String()), ra.Name.String())
	}

	return nil, fmt.Errorf("specify app using \"rkt enter --imageid ...\"")
}

func (f *Finder) getHashFromStore(img string) (*types.Hash, error) {
	h, err := types.NewHash(img)
	if err != nil {
		return nil, fmt.Errorf("%q is not a valid hash: %v", img, err)
	}
	fullKey, err := f.S.ResolveKey(img)
	if err != nil {
		return nil, fmt.Errorf("could not resolve image ID %q: %v", img, err)
	}
	h, err = types.NewHash(fullKey)
	if err != nil {
		// should never happen
		panic(fmt.Errorf("got an invalid hash from the store, looks like it is corrupted: %v", err))
	}
	return h, nil
}

func runRmImage(cmd *cobra.Command, args []string) (exit int) {
	if len(args) < 1 {
		stderr("rkt: Must provide at least one image key")
		return 1
	}

	s, err := store.NewStore(globalFlags.Dir)
	if err != nil {
		stderr("rkt: cannot open store: %v", err)
		return 1
	}

	//TODO(sgotti) Which return code to use when the removal fails only for some images?
	done := 0
	errors := 0
	staleErrors := 0
	for _, pkey := range args {
		errors++
		h, err := types.NewHash(pkey)
		if err != nil {
			stderr("rkt: wrong imageID %q: %v", pkey, err)
			continue
		}
		key, err := s.ResolveKey(h.String())
		if err != nil {
			stderr("rkt: imageID %q not valid: %v", pkey, err)
			continue
		}
		if key == "" {
			stderr("rkt: imageID %q doesn't exists", pkey)
			continue
		}

		if err = s.RemoveACI(key); err != nil {
			if serr, ok := err.(*store.StoreRemovalError); ok {
				staleErrors++
				stderr("rkt: some files cannot be removed for imageID %q: %v", pkey, serr)
			} else {
				stderr("rkt: error removing aci for imageID %q: %v", pkey, err)
				continue
			}
		}
		stdout("rkt: successfully removed aci for imageID: %q", pkey)
		errors--
		done++
	}

	if done > 0 {
		stderr("rkt: %d image(s) successfully removed", done)
	}
	if errors > 0 {
		stderr("rkt: %d image(s) cannot be removed", errors)
	}
	if staleErrors > 0 {
		stderr("rkt: %d image(s) removed but left some stale files", staleErrors)
	}
	return 0
}

func runImageCatManifest(cmd *cobra.Command, args []string) (exit int) {
	if len(args) != 1 {
		cmd.Usage()
		return 1
	}

	s, err := store.NewStore(globalFlags.Dir)
	if err != nil {
		stderr("image cat-manifest: cannot open store: %v", err)
		return 1
	}

	var key string
	if _, err := types.NewHash(args[0]); err == nil {
		key, err = s.ResolveKey(args[0])
		if err != nil {
			stderr("image cat-manifest: cannot resolve key: %v", err)
			return 1
		}
	} else {
		app, err := discovery.NewAppFromString(args[0])
		if err != nil {
			stderr("image cat-manifest: cannot parse the image name: %v", err)
			return 1
		}
		labels, err := types.LabelsFromMap(app.Labels)
		if err != nil {
			stderr("image cat-manifest: invalid labels in the name: %v", err)
			return 1
		}
		key, err = s.GetACI(app.Name, labels)
		if err != nil {
			stderr("image cat-manifest: cannot find image: %v", err)
			return 1
		}
	}

	manifest, err := s.GetImageManifest(key)
	if err != nil {
		stderr("image cat-manifest: cannot get image manifest: %v", err)
		return 1
	}

	var b []byte
	if flagPrettyPrint {
		b, err = json.MarshalIndent(manifest, "", "\t")
	} else {
		b, err = json.Marshal(manifest)
	}
	if err != nil {
		stderr("image cat-manifest: cannot read the image manifest: %v", err)
		return 1
	}

	stdout(string(b))
	return 0
}

// getStage1Hash returns the hash of the stage1 image used in this pod
func (p *pod) getStage1Hash() (*types.Hash, error) {
	s1IDb, err := p.readFile(common.Stage1IDFilename)
	if err != nil {
		return nil, err
	}
	s1img, err := types.NewHash(string(s1IDb))
	if err != nil {
		return nil, err
	}

	return s1img, nil
}

func rmImages(s *store.Store, images []string) error {
	done := 0
	errors := 0
	staleErrors := 0
	for _, pkey := range images {
		errors++
		h, err := types.NewHash(pkey)
		if err != nil {
			stderr("rkt: wrong image ID %q: %v", pkey, err)
			continue
		}
		key, err := s.ResolveKey(h.String())
		if err != nil {
			stderr("rkt: image ID %q not valid: %v", pkey, err)
			continue
		}
		if key == "" {
			stderr("rkt: image ID %q doesn't exist", pkey)
			continue
		}

		if err = s.RemoveACI(key); err != nil {
			if serr, ok := err.(*store.StoreRemovalError); ok {
				staleErrors++
				stderr("rkt: some files cannot be removed for image ID %q: %v", pkey, serr)
			} else {
				stderr("rkt: error removing aci for image ID %q: %v", pkey, err)
				continue
			}
		}
		stdout("rkt: successfully removed aci for image ID: %q", pkey)
		errors--
		done++
	}

	if done > 0 {
		stderr("rkt: %d image(s) successfully removed", done)
	}

	// If anything didn't complete, return exit status of 1
	if (errors + staleErrors) > 0 {
		if staleErrors > 0 {
			stderr("rkt: %d image(s) removed but left some stale files", staleErrors)
		}
		if errors > 0 {
			stderr("rkt: %d image(s) cannot be removed", errors)
		}
		return fmt.Errorf("error(s) found while removing images")
	}

	return nil
}

func getStoreKeyFromAppOrHash(s *store.Store, input string) (string, error) {
	var key string
	if _, err := types.NewHash(input); err == nil {
		key, err = s.ResolveKey(input)
		if err != nil {
			return "", fmt.Errorf("cannot resolve key: %v", err)
		}
	} else {
		key, err = getStoreKeyFromApp(s, input)
		if err != nil {
			return "", fmt.Errorf("cannot find image: %v", err)
		}
	}
	return key, nil
}

func guessImageType(image string) apps.AppImageType {
	if _, err := types.NewHash(image); err == nil {
		return apps.AppImageHash
	}
	if u, err := url.Parse(image); err == nil && u.Scheme != "" {
		return apps.AppImageURL
	}
	if filepath.IsAbs(image) {
		return apps.AppImagePath
	}

	// Well, at this point is basically heuristics time. The image
	// parameter can be either a relative path or an image name.

	// First, let's check if there is a colon in the image
	// parameter. Colon often serves as a paths separator (like in
	// the PATH environment variable), so if it exists, then it is
	// highly unlikely that the image parameter is a path. Colon
	// in this context is often used for specifying a version of
	// an image, like in "example.com/reduce-worker:1.0.0".
	if strings.ContainsRune(image, ':') {
		return apps.AppImageName
	}

	// Second, let's check if there is a dot followed by a slash
	// (./) - if so, it is likely that the image parameter is path
	// like ./aci-in-this-dir or ../aci-in-parent-dir
	if strings.Contains(image, "./") {
		return apps.AppImagePath
	}

	// Third, let's check if the image parameter has an .aci
	// extension. If so, likely a path like "stage1-coreos.aci".
	if filepath.Ext(image) == schema.ACIExtension {
		return apps.AppImagePath
	}

	// At this point, if the image parameter is something like
	// "coreos.com/rkt/stage1-coreos" and you have a directory
	// tree "coreos.com/rkt" in the current working directory and
	// you meant the image parameter to point to the file
	// "stage1-coreos" in this directory tree, then you better be
	// off prepending the parameter with "./", because I'm gonna
	// treat this as an image name otherwise.
	return apps.AppImageName
}

// Write renders the ACI with the provided key in the treestore
// Write, to avoid having a rendered ACI with old stale files, requires that
// the destination directory doesn't exist (usually Remove should be called
// before Write)
func (ts *TreeStore) Write(key string, s *Store) error {
	treepath := filepath.Join(ts.path, key)
	fi, _ := os.Stat(treepath)
	if fi != nil {
		return fmt.Errorf("treestore: path %s already exists", treepath)
	}
	imageID, err := types.NewHash(key)
	if err != nil {
		return fmt.Errorf("treestore: cannot convert key to imageID: %v", err)
	}
	if err := os.MkdirAll(treepath, 0755); err != nil {
		return fmt.Errorf("treestore: cannot create treestore directory %s: %v", treepath, err)
	}
	err = aci.RenderACIWithImageID(*imageID, treepath, s)
	if err != nil {
		return fmt.Errorf("treestore: cannot render aci: %v", err)
	}
	hash, err := ts.Hash(key)
	if err != nil {
		return fmt.Errorf("treestore: cannot calculate tree hash: %v", err)
	}
	err = ioutil.WriteFile(filepath.Join(treepath, hashfilename), []byte(hash), 0644)
	if err != nil {
		return fmt.Errorf("treestore: cannot write hash file: %v", err)
	}
	// before creating the "rendered" flag file we need to ensure that all data is fsynced
	dfd, err := syscall.Open(treepath, syscall.O_RDONLY, 0)
	if err != nil {
		return err
	}
	defer syscall.Close(dfd)
	if err := sys.Syncfs(dfd); err != nil {
		return fmt.Errorf("treestore: failed to sync data: %v", err)
	}
	// Create rendered file
	f, err := os.Create(filepath.Join(treepath, renderedfilename))
	if err != nil {
		return fmt.Errorf("treestore: failed to write rendered file: %v", err)
	}
	f.Close()

	if err := syscall.Fsync(dfd); err != nil {
		return fmt.Errorf("treestore: failed to sync tree store directory: %v", err)
	}
	return nil
}

// GetTreeStoreID calculates the treestore ID for the given image key.
// The treeStoreID is computed as an hash of the flattened dependency tree
// image keys. In this way the ID may change for the same key if the image's
// dependencies change.
func (s Store) GetTreeStoreID(key string) (string, error) {
	hash, err := types.NewHash(key)
	if err != nil {
		return "", err
	}
	images, err := acirenderer.CreateDepListFromImageID(*hash, s)
	if err != nil {
		return "", err
	}

	keys := []string{}
	for _, image := range images {
		keys = append(keys, image.Key)
	}
	imagesString := strings.Join(keys, ",")
	h := sha512.New()
	h.Write([]byte(imagesString))
	return "deps-" + hashToKey(h), nil
}

// FindImage tries to get a hash of a passed image, ideally from
// store. Otherwise this might involve fetching it from remote with
// the Fetcher.
func (f *Finder) FindImage(img string, asc string, imgType apps.AppImageType) (*types.Hash, error) {
	if imgType == apps.AppImageGuess {
		imgType = guessImageType(img)
	}

	if imgType == apps.AppImageHash {
		return f.getHashFromStore(img)
	}

	// urls, names, paths have to be fetched, potentially remotely
	ft := (*Fetcher)(f)
	key, err := ft.FetchImage(img, asc, imgType)
	if err != nil {
		return nil, err
	}
	h, err := types.NewHash(key)
	if err != nil {
		// should never happen
		panic(fmt.Errorf("got an invalid hash from the store, looks like it is corrupted: %v", err))
	}
	return h, nil
}

func getKeyFromAppOrHash(s *store.Store, input string) (string, error) {
	var key string
	if _, err := types.NewHash(input); err == nil {
		key, err = s.ResolveKey(input)
		if err != nil {
			return "", fmt.Errorf("cannot resolve key: %v", err)
		}
	} else {
		app, err := discovery.NewAppFromString(input)
		if err != nil {
			return "", fmt.Errorf("cannot parse the image name: %v", err)
		}
		labels, err := types.LabelsFromMap(app.Labels)
		if err != nil {
			return "", fmt.Errorf("invalid labels in the name: %v", err)
		}
		key, err = s.GetACI(app.Name, labels)
		if err != nil {
			return "", fmt.Errorf("cannot find image: %v", err)
		}
	}

	return key, nil
}

//.........这里部分代码省略.........
							Group: "0",
							Environment: []types.EnvironmentVariable{
								{"CAPABILITY", strconv.Itoa(int(capability.CAP_NET_BIND_SERVICE))},
							},
							Isolators: []types.Isolator{
								{
									Name:     "os/linux/capabilities-retain-set",
									ValueRaw: rawValue(fmt.Sprintf(`{"set":["CAP_NET_BIND_SERVICE"]}`)),
								},
							},
						},
					},
				},
			},
			true,
			fmt.Sprintf("%v=enabled", capability.CAP_NET_BIND_SERVICE.String()),
			"",
		},
	}

	for i, tt := range tests {
		if tt.cgroup != "" && !cgroup.IsIsolatorSupported(tt.cgroup) {
			t.Logf("Skip test #%v: cgroup %s not supported", i, tt.cgroup)
			continue
		}

		j := 0
		for name, patches := range tt.images {
			imageFile := patchTestACI(name, patches...)
			hash := importImageAndFetchHash(t, ctx, imageFile)
			defer os.Remove(imageFile)

			imgName := types.MustACIdentifier(name)
			imgID, err := types.NewHash(hash)
			if err != nil {
				t.Fatalf("Cannot generate types.Hash from %v: %v", hash, err)
			}

			ra := &tt.podManifest.Apps[j]
			ra.Image.Name = imgName
			ra.Image.ID = *imgID

			j++
		}

		tt.podManifest.ACKind = schema.PodManifestKind
		tt.podManifest.ACVersion = schema.AppContainerVersion

		manifestFile := generatePodManifestFile(t, tt.podManifest)
		defer os.Remove(manifestFile)

		// 1. Test 'rkt run'.
		runCmd := fmt.Sprintf("%s run --mds-register=false --pod-manifest=%s", ctx.cmd(), manifestFile)
		t.Logf("Running 'run' test #%v: %v", i, runCmd)
		child, err := gexpect.Spawn(runCmd)
		if err != nil {
			t.Fatalf("Cannot exec rkt #%v: %v", i, err)
		}

		if tt.expectedResult != "" {
			if err := expectWithOutput(child, tt.expectedResult); err != nil {
				t.Fatalf("Expected %q but not found: %v", tt.expectedResult, err)
			}
		}
		if err := child.Wait(); err != nil {
			if tt.shouldSuccess {

//.........这里部分代码省略.........
		{
			contents: "hello",
			header: &tar.Header{
				Name: "rootfs/d/file01.txt",
				Size: 5,
				Mode: 0700,
			},
		},
		// The file and the directory should not appear
		{
			contents: "hello",
			header: &tar.Header{
				Name: "rootfs/e/file01.txt",
				Size: 5,
				Mode: 0700,
			},
		},
	}

	key1, err := newTestACI(entries, dir, ds)
	if err != nil {
		t.Fatalf("unexpected error: %v", err)
	}
	im, err := createImageManifest(imj)
	if err != nil {
		t.Fatalf("unexpected error: %v", err)
	}
	image1 := Image{Im: im, Key: key1, Level: 1}

	imj = `
		{
		    "acKind": "ImageManifest",
		    "acVersion": "0.1.1",
		    "name": "example.com/test02"
		}
	`

	k1, _ := types.NewHash(key1)
	imj, err = addDependencies(imj,
		types.Dependency{
			ImageName: "example.com/test01",
			ImageID:   k1},
	)

	entries = []*testTarEntry{
		{
			contents: imj,
			header: &tar.Header{
				Name: "manifest",
				Size: int64(len(imj)),
			},
		},
		{
			contents: "hellohello",
			header: &tar.Header{
				Name: "rootfs/b/file01.txt",
				Size: 10,
			},
		},
		// New file
		{
			contents: "hello",
			header: &tar.Header{
				Name: "rootfs/c/file02.txt",
				Size: 5,
			},
		},
	}

	expectedFiles := []*fileInfo{
		&fileInfo{path: "manifest", typeflag: tar.TypeReg},
		&fileInfo{path: "rootfs/a/file01.txt", typeflag: tar.TypeReg, size: 5},
		&fileInfo{path: "rootfs/a/file02.txt", typeflag: tar.TypeReg, size: 5},
		&fileInfo{path: "rootfs/b/link01.txt", typeflag: tar.TypeSymlink},
		&fileInfo{path: "rootfs/b/file01.txt", typeflag: tar.TypeReg, size: 10},
		&fileInfo{path: "rootfs/c", typeflag: tar.TypeDir, mode: 0700},
		&fileInfo{path: "rootfs/c/file02.txt", typeflag: tar.TypeReg, size: 5},
		&fileInfo{path: "rootfs/d", typeflag: tar.TypeDir, mode: 0700},
	}

	key2, err := newTestACI(entries, dir, ds)
	if err != nil {
		t.Fatalf("unexpected error: %v", err)
	}
	im, err = createImageManifest(imj)
	if err != nil {
		t.Fatalf("unexpected error: %v", err)
	}
	image2 := Image{Im: im, Key: key2, Level: 0}

	images := Images{image2, image1}
	err = checkRenderACIFromList(images, expectedFiles, ds)
	if err != nil {
		t.Fatalf("unexpected error: %v", err)
	}
	err = checkRenderACI("example.com/test02", expectedFiles, ds)
	if err != nil {
		t.Fatalf("unexpected error: %v", err)
	}
}