func (s *saveSession) saveImage(id image.ID) (map[layer.DiffID]distribution.Descriptor, error) {
img, err := s.is.Get(id)
if err != nil {
return nil, err
}
if len(img.RootFS.DiffIDs) == 0 {
return nil, fmt.Errorf("empty export - not implemented")
}
var parent digest.Digest
var layers []string
var foreignSrcs map[layer.DiffID]distribution.Descriptor
for i := range img.RootFS.DiffIDs {
v1Img := image.V1Image{
Created: img.Created,
}
if i == len(img.RootFS.DiffIDs)-1 {
v1Img = img.V1Image
}
rootFS := *img.RootFS
rootFS.DiffIDs = rootFS.DiffIDs[:i+1]
v1ID, err := v1.CreateID(v1Img, rootFS.ChainID(), parent)
if err != nil {
return nil, err
}
v1Img.ID = v1ID.Hex()
if parent != "" {
v1Img.Parent = parent.Hex()
}
src, err := s.saveLayer(rootFS.ChainID(), v1Img, img.Created)
if err != nil {
return nil, err
}
layers = append(layers, v1Img.ID)
parent = v1ID
if src.Digest != "" {
if foreignSrcs == nil {
foreignSrcs = make(map[layer.DiffID]distribution.Descriptor)
}
foreignSrcs[img.RootFS.DiffIDs[i]] = src
}
}
configFile := filepath.Join(s.outDir, id.Digest().Hex()+".json")
if err := ioutil.WriteFile(configFile, img.RawJSON(), 0644); err != nil {
return nil, err
}
if err := system.Chtimes(configFile, img.Created, img.Created); err != nil {
return nil, err
}
s.images[id].layers = layers
return foreignSrcs, nil
}
// 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
}
logrus.Debugf("CreateV1ID %s", configJSON)
return digest.FromBytes(configJSON), nil
}
func (s *saveSession) saveImage(id image.ID) error {
img, err := s.is.Get(id)
if err != nil {
return err
}
if len(img.RootFS.DiffIDs) == 0 {
return fmt.Errorf("empty export - not implemented")
}
var parent digest.Digest
var layers []string
for i := range img.RootFS.DiffIDs {
v1Img := image.V1Image{}
if i == len(img.RootFS.DiffIDs)-1 {
v1Img = img.V1Image
}
rootFS := *img.RootFS
rootFS.DiffIDs = rootFS.DiffIDs[:i+1]
v1ID, err := v1.CreateID(v1Img, rootFS.ChainID(), parent)
if err != nil {
return err
}
v1Img.ID = v1ID.Hex()
if parent != "" {
v1Img.Parent = parent.Hex()
}
if err := s.saveLayer(rootFS.ChainID(), v1Img, img.Created); err != nil {
return err
}
layers = append(layers, v1Img.ID)
parent = v1ID
}
configFile := filepath.Join(s.outDir, digest.Digest(id).Hex()+".json")
if err := ioutil.WriteFile(configFile, img.RawJSON(), 0644); err != nil {
return err
}
if err := os.Chtimes(configFile, img.Created, img.Created); err != nil {
return err
}
s.images[id].layers = layers
return nil
}