restic: decouple restic.Handle

internal/backend/mem/mem_backend.go

@@ -73,7 +73,7 @@ func (be *MemoryBackend) Save(ctx context.Context, h restic.Handle, rd restic.Re
 	be.m.Lock()
 	defer be.m.Unlock()
 
-	h.ContainedBlobType = restic.InvalidBlob
+	h.IsMetadata = false
 	if h.Type == restic.ConfigFile {
 		h.Name = ""
 	}
@@ -120,7 +120,7 @@ func (be *MemoryBackend) openReader(ctx context.Context, h restic.Handle, length
 	be.m.Lock()
 	defer be.m.Unlock()
 
-	h.ContainedBlobType = restic.InvalidBlob
+	h.IsMetadata = false
 	if h.Type == restic.ConfigFile {
 		h.Name = ""
 	}
@@ -147,7 +147,7 @@ func (be *MemoryBackend) Stat(ctx context.Context, h restic.Handle) (restic.File
 	be.m.Lock()
 	defer be.m.Unlock()
 
-	h.ContainedBlobType = restic.InvalidBlob
+	h.IsMetadata = false
 	if h.Type == restic.ConfigFile {
 		h.Name = ""
 	}
@@ -165,7 +165,7 @@ func (be *MemoryBackend) Remove(ctx context.Context, h restic.Handle) error {
 	be.m.Lock()
 	defer be.m.Unlock()
 
-	h.ContainedBlobType = restic.InvalidBlob
+	h.IsMetadata = false
 	if _, ok := be.data[h]; !ok {
 		return errNotFound
 	}

internal/cache/backend.go

@@ -48,7 +48,7 @@ func autoCacheTypes(h restic.Handle) bool {
 	case restic.IndexFile, restic.SnapshotFile:
 		return true
 	case restic.PackFile:
-		return h.ContainedBlobType == restic.TreeBlob
+		return h.IsMetadata
 	}
 	return false
 }

internal/repository/packer_manager.go

@@ -163,7 +163,7 @@ func (r *Repository) savePacker(ctx context.Context, t restic.BlobType, p *Packe
 	}
 
 	id := restic.IDFromHash(hr.Sum(nil))
-	h := restic.Handle{Type: restic.PackFile, Name: id.String(), ContainedBlobType: t}
+	h := restic.Handle{Type: restic.PackFile, Name: id.String(), IsMetadata: t.IsMetadata()}
 	var beHash []byte
 	if beHr != nil {
 		beHash = beHr.Sum(nil)

internal/repository/repository.go

@@ -284,7 +284,7 @@ func (r *Repository) LoadBlob(ctx context.Context, t restic.BlobType, id restic.
 		}
 
 		// load blob from pack
-		h := restic.Handle{Type: restic.PackFile, Name: blob.PackID.String(), ContainedBlobType: t}
+		h := restic.Handle{Type: restic.PackFile, Name: blob.PackID.String(), IsMetadata: t.IsMetadata()}
 
 		switch {
 		case cap(buf) < int(blob.Length):
@@ -922,7 +922,7 @@ func StreamPack(ctx context.Context, beLoad BackendLoadFn, key *crypto.Key, pack
 }
 
 func streamPackPart(ctx context.Context, beLoad BackendLoadFn, key *crypto.Key, packID restic.ID, blobs []restic.Blob, handleBlobFn func(blob restic.BlobHandle, buf []byte, err error) error) error {
-	h := restic.Handle{Type: restic.PackFile, Name: packID.String(), ContainedBlobType: restic.DataBlob}
+	h := restic.Handle{Type: restic.PackFile, Name: packID.String(), IsMetadata: false}
 
 	dataStart := blobs[0].Offset
 	dataEnd := blobs[len(blobs)-1].Offset + blobs[len(blobs)-1].Length

internal/restic/blob.go

@@ -75,6 +75,15 @@ func (t BlobType) String() string {
 	return fmt.Sprintf("<BlobType %d>", t)
 }
 
+func (t BlobType) IsMetadata() bool {
+	switch t {
+	case TreeBlob:
+		return true
+	default:
+		return false
+	}
+}
+
 // MarshalJSON encodes the BlobType into JSON.
 func (t BlobType) MarshalJSON() ([]byte, error) {
 	switch t {

internal/restic/file.go

@@ -41,9 +41,9 @@ func (t FileType) String() string {
 
 // Handle is used to store and access data in a backend.
 type Handle struct {
-	Type              FileType
-	ContainedBlobType BlobType
-	Name              string
+	Type       FileType
+	IsMetadata bool
+	Name       string
 }
 
 func (h Handle) String() string {