Golang Image.RawJSON方法代码示例

// MakeV1ConfigFromConfig creates an legacy V1 image config from an Image struct
func MakeV1ConfigFromConfig(img *image.Image, v1ID, parentV1ID string, throwaway bool) ([]byte, error) {
	// Top-level v1compatibility string should be a modified version of the
	// image config.
	var configAsMap map[string]*json.RawMessage
	if err := json.Unmarshal(img.RawJSON(), &configAsMap); err != nil {
		return nil, err
	}

	// Delete fields that didn't exist in old manifest
	imageType := reflect.TypeOf(img).Elem()
	for i := 0; i < imageType.NumField(); i++ {
		f := imageType.Field(i)
		jsonName := strings.Split(f.Tag.Get("json"), ",")[0]
		// Parent is handled specially below.
		if jsonName != "" && jsonName != "parent" {
			delete(configAsMap, jsonName)
		}
	}
	configAsMap["id"] = rawJSON(v1ID)
	if parentV1ID != "" {
		configAsMap["parent"] = rawJSON(parentV1ID)
	}
	if throwaway {
		configAsMap["throwaway"] = rawJSON(true)
	}

	return json.Marshal(configAsMap)
}

// MakeV1ConfigFromConfig creates an legacy V1 image config from an Image struct
func MakeV1ConfigFromConfig(img *image.Image, v1ID, parentV1ID string, throwaway bool) ([]byte, error) {
	// Top-level v1compatibility string should be a modified version of the
	// image config.
	var configAsMap map[string]*json.RawMessage
	if err := json.Unmarshal(img.RawJSON(), &configAsMap); err != nil {
		return nil, err
	}

	// Delete fields that didn't exist in old manifest
	delete(configAsMap, "rootfs")
	delete(configAsMap, "history")
	configAsMap["id"] = rawJSON(v1ID)
	if parentV1ID != "" {
		configAsMap["parent"] = rawJSON(parentV1ID)
	}
	if throwaway {
		configAsMap["throwaway"] = rawJSON(true)
	}

	return json.Marshal(configAsMap)
}

// CreateV2Manifest creates a V2 manifest from an image config and set of
// FSLayer digests.
// FIXME: This should be moved to the distribution repo, since it will also
// be useful for converting new manifests to the old format.
func CreateV2Manifest(name, tag string, img *image.Image, fsLayers map[layer.DiffID]digest.Digest) (*schema1.Manifest, error) {
	if len(img.History) == 0 {
		return nil, errors.New("empty history when trying to create V2 manifest")
	}

	// Generate IDs for each layer
	// For non-top-level layers, create fake V1Compatibility strings that
	// fit the format and don't collide with anything else, but don't
	// result in runnable images on their own.
	type v1Compatibility struct {
		ID              string    `json:"id"`
		Parent          string    `json:"parent,omitempty"`
		Comment         string    `json:"comment,omitempty"`
		Created         time.Time `json:"created"`
		ContainerConfig struct {
			Cmd []string
		} `json:"container_config,omitempty"`
		ThrowAway bool `json:"throwaway,omitempty"`
	}

	fsLayerList := make([]schema1.FSLayer, len(img.History))
	history := make([]schema1.History, len(img.History))

	parent := ""
	layerCounter := 0
	for i, h := range img.History {
		if i == len(img.History)-1 {
			break
		}

		var diffID layer.DiffID
		if h.EmptyLayer {
			diffID = layer.EmptyLayer.DiffID()
		} else {
			if len(img.RootFS.DiffIDs) <= layerCounter {
				return nil, errors.New("too many non-empty layers in History section")
			}
			diffID = img.RootFS.DiffIDs[layerCounter]
			layerCounter++
		}

		fsLayer, present := fsLayers[diffID]
		if !present {
			return nil, fmt.Errorf("missing layer in CreateV2Manifest: %s", diffID.String())
		}
		dgst, err := digest.FromBytes([]byte(fsLayer.Hex() + " " + parent))
		if err != nil {
			return nil, err
		}
		v1ID := dgst.Hex()

		v1Compatibility := v1Compatibility{
			ID:      v1ID,
			Parent:  parent,
			Comment: h.Comment,
			Created: h.Created,
		}
		v1Compatibility.ContainerConfig.Cmd = []string{img.History[i].CreatedBy}
		if h.EmptyLayer {
			v1Compatibility.ThrowAway = true
		}
		jsonBytes, err := json.Marshal(&v1Compatibility)
		if err != nil {
			return nil, err
		}

		reversedIndex := len(img.History) - i - 1
		history[reversedIndex].V1Compatibility = string(jsonBytes)
		fsLayerList[reversedIndex] = schema1.FSLayer{BlobSum: fsLayer}

		parent = v1ID
	}

	latestHistory := img.History[len(img.History)-1]

	var diffID layer.DiffID
	if latestHistory.EmptyLayer {
		diffID = layer.EmptyLayer.DiffID()
	} else {
		if len(img.RootFS.DiffIDs) <= layerCounter {
			return nil, errors.New("too many non-empty layers in History section")
		}
		diffID = img.RootFS.DiffIDs[layerCounter]
	}
	fsLayer, present := fsLayers[diffID]
	if !present {
		return nil, fmt.Errorf("missing layer in CreateV2Manifest: %s", diffID.String())
	}

	dgst, err := digest.FromBytes([]byte(fsLayer.Hex() + " " + parent + " " + string(img.RawJSON())))
	if err != nil {
		return nil, err
	}
	fsLayerList[0] = schema1.FSLayer{BlobSum: fsLayer}

	// Top-level v1compatibility string should be a modified version of the
//.........这里部分代码省略.........