// ParseStoreReference takes a name or an ID, tries to figure out which it is
// relative to the given store, and returns it in a reference object.
func (s storageTransport) ParseStoreReference(store storage.Store, ref string) (*storageReference, error) {
var name reference.Named
var sum digest.Digest
var err error
if ref == "" {
return nil, ErrInvalidReference
}
if ref[0] == '[' {
// Ignore the store specifier.
closeIndex := strings.IndexRune(ref, ']')
if closeIndex < 1 {
return nil, ErrInvalidReference
}
ref = ref[closeIndex+1:]
}
refInfo := strings.SplitN(ref, "@", 2)
if len(refInfo) == 1 {
// A name.
name, err = reference.ParseNamed(refInfo[0])
if err != nil {
return nil, err
}
} else if len(refInfo) == 2 {
// An ID, possibly preceded by a name.
if refInfo[0] != "" {
name, err = reference.ParseNamed(refInfo[0])
if err != nil {
return nil, err
}
}
sum, err = digest.Parse("sha256:" + refInfo[1])
if err != nil {
return nil, err
}
} else { // Coverage: len(refInfo) is always 1 or 2
// Anything else: store specified in a form we don't
// recognize.
return nil, ErrInvalidReference
}
storeSpec := "[" + store.GetGraphDriverName() + "@" + store.GetGraphRoot() + "]"
id := ""
if sum.Validate() == nil {
id = sum.Hex()
}
refname := ""
if name != nil {
name = reference.WithDefaultTag(name)
refname = verboseName(name)
}
if refname == "" {
logrus.Debugf("parsed reference into %q", storeSpec+"@"+id)
} else if id == "" {
logrus.Debugf("parsed reference into %q", storeSpec+refname)
} else {
logrus.Debugf("parsed reference into %q", storeSpec+refname+"@"+id)
}
return newReference(storageTransport{store: store}, refname, id, name), nil
}
func (s storageTransport) GetStoreImage(store storage.Store, ref types.ImageReference) (*storage.Image, error) {
dref := ref.DockerReference()
if dref == nil {
if sref, ok := ref.(*storageReference); ok {
if sref.id != "" {
if img, err := store.GetImage(sref.id); err == nil {
return img, nil
}
}
}
return nil, ErrInvalidReference
}
return store.GetImage(verboseName(dref))
}
func diffLayer(store storage.Store, layerID string) (rc io.ReadCloser, n int64, err error) {
layer, err := store.GetLayer(layerID)
if err != nil {
return nil, -1, err
}
layerMeta := storageLayerMetadata{
CompressedSize: -1,
}
if layer.Metadata != "" {
if err := json.Unmarshal([]byte(layer.Metadata), &layerMeta); err != nil {
return nil, -1, errors.Wrapf(err, "error decoding metadata for layer %q", layerID)
}
}
if layerMeta.CompressedSize <= 0 {
n = -1
} else {
n = layerMeta.CompressedSize
}
diff, err := store.Diff("", layer.ID)
if err != nil {
return nil, -1, err
}
return diff, n, nil
}