github.com/lazyboychen7/engine@v17.12.1-ce-rc2+incompatible/distribution/metadata/v1_id_service.go (about)

     1  package metadata
     2  
     3  import (
     4  	"github.com/docker/docker/image/v1"
     5  	"github.com/docker/docker/layer"
     6  	"github.com/pkg/errors"
     7  )
     8  
     9  // V1IDService maps v1 IDs to layers on disk.
    10  type V1IDService struct {
    11  	store Store
    12  }
    13  
    14  // NewV1IDService creates a new V1 ID mapping service.
    15  func NewV1IDService(store Store) *V1IDService {
    16  	return &V1IDService{
    17  		store: store,
    18  	}
    19  }
    20  
    21  // namespace returns the namespace used by this service.
    22  func (idserv *V1IDService) namespace() string {
    23  	return "v1id"
    24  }
    25  
    26  // Get finds a layer by its V1 ID.
    27  func (idserv *V1IDService) Get(v1ID, registry string) (layer.DiffID, error) {
    28  	if idserv.store == nil {
    29  		return "", errors.New("no v1IDService storage")
    30  	}
    31  	if err := v1.ValidateID(v1ID); err != nil {
    32  		return layer.DiffID(""), err
    33  	}
    34  
    35  	idBytes, err := idserv.store.Get(idserv.namespace(), registry+","+v1ID)
    36  	if err != nil {
    37  		return layer.DiffID(""), err
    38  	}
    39  	return layer.DiffID(idBytes), nil
    40  }
    41  
    42  // Set associates an image with a V1 ID.
    43  func (idserv *V1IDService) Set(v1ID, registry string, id layer.DiffID) error {
    44  	if idserv.store == nil {
    45  		return nil
    46  	}
    47  	if err := v1.ValidateID(v1ID); err != nil {
    48  		return err
    49  	}
    50  	return idserv.store.Set(idserv.namespace(), registry+","+v1ID, []byte(id))
    51  }