package v1

import (

"context"

"encoding/json"

"github.com/containerd/log"

"github.com/docker/docker/image"

"github.com/docker/docker/layer"

"github.com/opencontainers/go-digest"

)

// CreateID creates an ID from v1 image, layerID and parent ID.

// Used for backwards compatibility with old clients.

func CreateID(v1Image image.V1Image, layerID layer.ChainID, parent digest.Digest) (digest.Digest, error) {

v1Image.ID = ""

v1JSON, err := json.Marshal(v1Image)

if err != nil {

return "", err

}

var config map[string]*json.RawMessage

if err := json.Unmarshal(v1JSON, &config); err != nil {

return "", err

}

// FIXME: note that this is slightly incompatible with RootFS logic

config["layer_id"] = rawJSON(layerID)

if parent != "" {

config["parent"] = rawJSON(parent)

}

configJSON, err := json.Marshal(config)

if err != nil {

return "", err

}

log.G(context.TODO()).Debugf("CreateV1ID %s", configJSON)

return digest.FromBytes(configJSON), nil

}

func rawJSON(value interface{}) *json.RawMessage {

jsonval, err := json.Marshal(value)

if err != nil {

return nil

}

return (*json.RawMessage)(&jsonval)

}