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package metadata // import "github.com/docker/docker/distribution/metadata"
import (
v1 "github.com/docker/docker/image/v1"
"github.com/docker/docker/layer"
"github.com/pkg/errors"
)
// V1IDService maps v1 IDs to layers on disk.
type V1IDService struct {
store Store
}
// NewV1IDService creates a new V1 ID mapping service.
func NewV1IDService(store Store) *V1IDService {
return &V1IDService{
store: store,
}
}
// namespace returns the namespace used by this service.
func (idserv *V1IDService) namespace() string {
return "v1id"
}
// Get finds a layer by its V1 ID.
func (idserv *V1IDService) Get(v1ID, registry string) (layer.DiffID, error) {
if idserv.store == nil {
return "", errors.New("no v1IDService storage")
}
if err := v1.ValidateID(v1ID); err != nil {
return layer.DiffID(""), err
}
idBytes, err := idserv.store.Get(idserv.namespace(), registry+","+v1ID)
if err != nil {
return layer.DiffID(""), err
}
return layer.DiffID(idBytes), nil
}
// Set associates an image with a V1 ID.
func (idserv *V1IDService) Set(v1ID, registry string, id layer.DiffID) error {
if idserv.store == nil {
return nil
}
if err := v1.ValidateID(v1ID); err != nil {
return err
}
return idserv.store.Set(idserv.namespace(), registry+","+v1ID, []byte(id))
}
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