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moby--moby/graph/manifest_test.go

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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 := &registry.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, &registry.FSLayer{BlobSum: checksum})
layersSeen[layer.ID] = true
manifest.History = append(manifest.History, &registry.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)
}
}