add plugin config

drivers/exec/driver.go

@@ -31,13 +31,20 @@ const (
 )
 
 var (
-	// PluginID is the rawexec plugin metadata registered in the plugin
+	// PluginID is the exec plugin metadata registered in the plugin
 	// catalog.
 	PluginID = loader.PluginID{
 		Name:       pluginName,
 		PluginType: base.PluginTypeDriver,
 	}
 
+	// PluginConfig is the exec driver factory function registered in the
+	// plugin catalog.
+	PluginConfig = &loader.InternalPluginConfig{
+		Config:  map[string]interface{}{},
+		Factory: func(l hclog.Logger) interface{} { return NewExecDriver(l) },
+	}
+
 	// pluginInfo is the response returned for the PluginInfo RPC
 	pluginInfo = &base.PluginInfoResponse{
 		Type:             base.PluginTypeDriver,