feat: v2 (#599)

Read https://github.com/filebrowser/filebrowser/pull/575.

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Former-commit-id: e032e0804dd051df86f42962de2b39caec5318b7

storage/bolt/importer/importer.go

@@ -0,0 +1,35 @@
+package importer
+
+import (
+	"github.com/asdine/storm"
+	"github.com/filebrowser/filebrowser/v2/storage/bolt"
+)
+
+// Import imports an old configuration to a newer database.
+func Import(oldDB, oldConf, newDB string) error {
+	old, err := storm.Open(oldDB)
+	if err != nil {
+		return err
+	}
+	defer old.Close()
+
+	new, err := storm.Open(newDB)
+	if err != nil {
+		return err
+	}
+	defer new.Close()
+
+	sto := bolt.NewStorage(new)
+
+	err = importUsers(old, sto)
+	if err != nil {
+		return err
+	}
+
+	err = importConf(old, oldConf, sto)
+	if err != nil {
+		return err
+	}
+
+	return err
+}