Use atom-specific names for restic stdin snapshots

repository_restic.go

@@ -221,8 +221,18 @@ func (r *resticRepository) RestoreCmd(ctx context.Context, rctx RuntimeContext,
 // A special path for stdin datasets that is likely to be unused by the
 // rest of the filesystem (the path namespace in Restic is global).
 func datasetStdinPath(ds *Dataset) string {
-	dsPath := filepath.Join(ds.Source, ds.ID)
-	return fmt.Sprintf("/STDIN_%s", strings.Replace(dsPath, "/", "_", -1))
+	var dsPath string
+	switch len(ds.Atoms) {
+	case 0:
+		dsPath = ds.Source
+	case 1:
+		dsPath = filepath.Join(ds.Source, ds.Atoms[0].Name)
+	default:
+		dsPath = filepath.Join(ds.Source, "all")
+	}
+	dsPath = strings.TrimPrefix(dsPath, "/")
+	dsPath = strings.Replace(dsPath, "/", "_", -1)
+	return fmt.Sprintf("/STDIN_%s", dsPath)
 }
 
 func (r *resticRepository) BackupStreamCmd(backup *Backup, ds *Dataset) string {