Not syncing stdout and stderr of pluging with client

command/executor_plugin.go

@@ -1,6 +1,7 @@
 package command
 
 import (
+	"os"
 	"strings"
 
 	"github.com/hashicorp/go-plugin"
@@ -24,9 +25,19 @@ func (e *ExecutorPluginCommand) Synopsis() string {
 }
 
 func (e *ExecutorPluginCommand) Run(args []string) int {
+	if len(args) == 0 {
+		e.Ui.Error("log output file isn't provided")
+		return 1
+	}
+	logFileName := args[0]
+	stdo, err := os.OpenFile(logFileName, os.O_CREATE|os.O_RDWR|os.O_APPEND, 0666)
+	if err != nil {
+		e.Ui.Error(err.Error())
+		return 1
+	}
 	plugin.Serve(&plugin.ServeConfig{
 		HandshakeConfig: driver.HandshakeConfig,
-		Plugins:         driver.PluginMap,
+		Plugins:         driver.GetPluginMap(stdo),
 	})
 	return 0
 }