91 lines
2.4 KiB
Go
91 lines
2.4 KiB
Go
package storage
|
|
|
|
import (
|
|
"fmt"
|
|
"io"
|
|
"time"
|
|
|
|
"github.com/docker/distribution/digest"
|
|
"github.com/docker/distribution/manifest"
|
|
)
|
|
|
|
// Layer provides a readable and seekable layer object. Typically,
|
|
// implementations are *not* goroutine safe.
|
|
type Layer interface {
|
|
// http.ServeContent requires an efficient implementation of
|
|
// ReadSeeker.Seek(0, os.SEEK_END).
|
|
io.ReadSeeker
|
|
io.Closer
|
|
|
|
// Name returns the repository under which this layer is linked.
|
|
Name() string // TODO(stevvooe): struggling with nomenclature: should this be "repo" or "name"?
|
|
|
|
// Digest returns the unique digest of the blob, which is the tarsum for
|
|
// layers.
|
|
Digest() digest.Digest
|
|
|
|
// CreatedAt returns the time this layer was created.
|
|
CreatedAt() time.Time
|
|
}
|
|
|
|
// LayerUpload provides a handle for working with in-progress uploads.
|
|
// Instances can be obtained from the LayerService.Upload and
|
|
// LayerService.Resume.
|
|
type LayerUpload interface {
|
|
io.WriteSeeker
|
|
io.ReaderFrom
|
|
io.Closer
|
|
|
|
// Name of the repository under which the layer will be linked.
|
|
Name() string
|
|
|
|
// UUID returns the identifier for this upload.
|
|
UUID() string
|
|
|
|
// StartedAt returns the time this layer upload was started.
|
|
StartedAt() time.Time
|
|
|
|
// Finish marks the upload as completed, returning a valid handle to the
|
|
// uploaded layer. The digest is validated against the contents of the
|
|
// uploaded layer.
|
|
Finish(digest digest.Digest) (Layer, error)
|
|
|
|
// Cancel the layer upload process.
|
|
Cancel() error
|
|
}
|
|
|
|
var (
|
|
// ErrLayerExists returned when layer already exists
|
|
ErrLayerExists = fmt.Errorf("layer exists")
|
|
|
|
// ErrLayerTarSumVersionUnsupported when tarsum is unsupported version.
|
|
ErrLayerTarSumVersionUnsupported = fmt.Errorf("unsupported tarsum version")
|
|
|
|
// ErrLayerUploadUnknown returned when upload is not found.
|
|
ErrLayerUploadUnknown = fmt.Errorf("layer upload unknown")
|
|
|
|
// ErrLayerClosed returned when an operation is attempted on a closed
|
|
// Layer or LayerUpload.
|
|
ErrLayerClosed = fmt.Errorf("layer closed")
|
|
)
|
|
|
|
// ErrUnknownLayer returned when layer cannot be found.
|
|
type ErrUnknownLayer struct {
|
|
FSLayer manifest.FSLayer
|
|
}
|
|
|
|
func (err ErrUnknownLayer) Error() string {
|
|
return fmt.Sprintf("unknown layer %v", err.FSLayer.BlobSum)
|
|
}
|
|
|
|
// ErrLayerInvalidDigest returned when tarsum check fails.
|
|
type ErrLayerInvalidDigest struct {
|
|
Digest digest.Digest
|
|
Reason error
|
|
}
|
|
|
|
func (err ErrLayerInvalidDigest) Error() string {
|
|
return fmt.Sprintf("invalid digest for referenced layer: %v, %v",
|
|
err.Digest, err.Reason)
|
|
}
|