Add support for explicit Sync

buntdb.go

@@ -628,6 +628,20 @@ func (db *DB) backgroundManager() {
 	}
 }
 
+// Sync will synchronously persist the database file to disk. This
+// should only be used when [SyncPolicy] is set to [Never].
+func (db *DB) Sync() error {
+	db.mu.Lock()
+	defer db.mu.Unlock()
+	if db.closed {
+		return ErrDatabaseClosed
+	}
+	if !db.persist {
+		return nil
+	}
+	return db.file.Sync()
+}
+
 // Shrink will make the database file smaller by removing redundant
 // log entries. This operation does not block the database.
 func (db *DB) Shrink() error {