Continue work on database module

database/dbmodule/db.go

@@ -0,0 +1,29 @@
+package dbmodule
+
+import (
+  "github.com/Safing/portbase/database"
+)
+
+var (
+	databaseDir string
+)
+
+func init() {
+  flag.StringVar(&databaseDir, "db", "", "set database directory")
+
+  modules.Register("database", prep, start, stop)
+}
+
+func prep() error {
+  if databaseDir == "" {
+    return errors.New("no database location specified, set with `-db=/path/to/db`")
+  }
+}
+
+func start() error {
+  return database.Initialize(databaseDir)
+}
+
+func stop() {
+  return database.Shutdown()
+}