package graph import ( "encoding/json" "fmt" "io" "io/ioutil" "os" "testing" "github.com/docker/docker/image" "github.com/docker/docker/pkg/tarsum" "github.com/docker/docker/registry" "github.com/docker/docker/runconfig" "github.com/docker/docker/utils" ) const ( testManifestImageName = "testapp" testManifestImageID = "d821b739e8834ec89ac4469266c3d11515da88fdcbcbdddcbcddb636f54fdde9" testManifestImageIDShort = "d821b739e883" testManifestTag = "manifesttest" ) func (s *TagStore) newManifest(localName, remoteName, tag string) ([]byte, error) { manifest := ®istry.ManifestData{ Name: remoteName, Tag: tag, SchemaVersion: 1, } localRepo, err := s.Get(localName) if err != nil { return nil, err } if localRepo == nil { return nil, fmt.Errorf("Repo does not exist: %s", localName) } // Get the top-most layer id which the tag points to layerId, exists := localRepo[tag] if !exists { return nil, fmt.Errorf("Tag does not exist for %s: %s", localName, tag) } layersSeen := make(map[string]bool) layer, err := s.graph.Get(layerId) if err != nil { return nil, err } manifest.Architecture = layer.Architecture manifest.FSLayers = make([]*registry.FSLayer, 0, 4) manifest.History = make([]*registry.ManifestHistory, 0, 4) var metadata runconfig.Config if layer.Config != nil { metadata = *layer.Config } for ; layer != nil; layer, err = layer.GetParent() { if err != nil { return nil, err } if layersSeen[layer.ID] { break } if layer.Config != nil && metadata.Image != layer.ID { err = runconfig.Merge(&metadata, layer.Config) if err != nil { return nil, err } } checksum, err := layer.GetCheckSum(s.graph.ImageRoot(layer.ID)) if err != nil { return nil, fmt.Errorf("Error getting image checksum: %s", err) } if tarsum.VersionLabelForChecksum(checksum) != tarsum.Version1.String() { archive, err := layer.TarLayer() if err != nil { return nil, err } defer archive.Close() tarSum, err := tarsum.NewTarSum(archive, true, tarsum.Version1) if err != nil { return nil, err } if _, err := io.Copy(ioutil.Discard, tarSum); err != nil { return nil, err } checksum = tarSum.Sum(nil) // Save checksum value if err := layer.SaveCheckSum(s.graph.ImageRoot(layer.ID), checksum); err != nil { return nil, err } } jsonData, err := layer.RawJson() if err != nil { return nil, fmt.Errorf("Cannot retrieve the path for {%s}: %s", layer.ID, err) } manifest.FSLayers = append(manifest.FSLayers, ®istry.FSLayer{BlobSum: checksum}) layersSeen[layer.ID] = true manifest.History = append(manifest.History, ®istry.ManifestHistory{V1Compatibility: string(jsonData)}) } manifestBytes, err := json.MarshalIndent(manifest, "", " ") if err != nil { return nil, err } return manifestBytes, nil } func TestManifestTarsumCache(t *testing.T) { tmp, err := utils.TestDirectory("") if err != nil { t.Fatal(err) } defer os.RemoveAll(tmp) store := mkTestTagStore(tmp, t) defer store.graph.driver.Cleanup() archive, err := fakeTar() if err != nil { t.Fatal(err) } img := &image.Image{ID: testManifestImageID} if err := store.graph.Register(img, archive); err != nil { t.Fatal(err) } if err := store.Tag(testManifestImageName, testManifestTag, testManifestImageID, false); err != nil { t.Fatal(err) } if cs, err := img.GetCheckSum(store.graph.ImageRoot(testManifestImageID)); err != nil { t.Fatal(err) } else if cs != "" { t.Fatalf("Non-empty checksum file after register") } // Generate manifest payload, err := store.newManifest(testManifestImageName, testManifestImageName, testManifestTag) if err != nil { t.Fatal(err) } manifestChecksum, err := img.GetCheckSum(store.graph.ImageRoot(testManifestImageID)) if err != nil { t.Fatal(err) } var manifest registry.ManifestData if err := json.Unmarshal(payload, &manifest); err != nil { t.Fatalf("error unmarshalling manifest: %s", err) } if len(manifest.FSLayers) != 1 { t.Fatalf("Unexpected number of layers, expecting 1: %d", len(manifest.FSLayers)) } if manifest.FSLayers[0].BlobSum != manifestChecksum { t.Fatalf("Unexpected blob sum, expecting %q, got %q", manifestChecksum, manifest.FSLayers[0].BlobSum) } if len(manifest.History) != 1 { t.Fatalf("Unexpected number of layer history, expecting 1: %d", len(manifest.History)) } v1compat, err := img.RawJson() if err != nil { t.Fatal(err) } if manifest.History[0].V1Compatibility != string(v1compat) { t.Fatalf("Unexpected json value\nExpected:\n%s\nActual:\n%s", v1compat, manifest.History[0].V1Compatibility) } }