Add oss tag to the 'db.go' file

Author: noah

LICENSE

@@ -20,8 +20,7 @@ software that would otherwise infringe either the contributor's
 copyright in it.
 
 1. You must limit use of this software in any manner primarily
-   intended for commercial advantage or private monetary compensation 
-   to the count of user limit. 
+   intended for commercial advantage or private monetary compensation.
    This limit does not apply to use in developing feedback or extensions 
    that you contribute back to those giving this license.
 

cmd/server/db.go

@@ -1,3 +1,9 @@
+// Copyright 2021 Gitploy.IO Inc. All rights reserved.
+// Use of this source code is governed by the Gitploy Non-Commercial License
+// that can be found in the LICENSE file.
+
+// +build !oss
+
 package main
 
 import (

cmd/server/db_oss.go

@@ -0,0 +1,18 @@
+// +build oss
+
+package main
+
+import (
+	"fmt"
+
+	"entgo.io/ent/dialect"
+	"github.com/gitploy-io/gitploy/ent"
+)
+
+func OpenDB(driver string, dsn string) (*ent.Client, error) {
+	if driver != dialect.SQLite {
+		return nil, fmt.Errorf("The driver have to be one of them: sqlite3, mysql, or postgres.")
+	}
+
+	return ent.Open(driver, dsn)
+}