You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: pluginpkg.go
    path of file: ./repos/tidb/cmd/pluginpkg
    
    the code of the file until where you have to start completion: // Copyright 2018 PingCAP, Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

package main

import (
	"context"
	"encoding/json"
	"flag"

    
func main() {
	flag.Parse()
	if pkgDir == "" || outDir == "" {
		flag.Usage()
	}
	pkgDir, err := filepath.Abs(pkgDir)
	if err != nil {
		log.Printf("unable to resolve absolute representation of package path , %+v\n", err)
		flag.Usage()
	}
	outDir, err := filepath.Abs(outDir)
	if err != nil {
		log.Printf("unable to resolve absolute representation of output path , %+v\n", err)
		flag.Usage()
	}

	var manifest map[string]any
	_, err = toml.DecodeFile(filepath.Join(pkgDir, "manifest.toml"), &manifest)
	if err != nil {
		log.Printf("read pkg %s's manifest failure, %+v\n", pkgDir, err)
		os.Exit(1)
	}
	manifest["buildTime"] = time.Now().String()

	pluginName := manifest["name"].(string)
	if pluginName != filepath.Base(pkgDir) {
		log.Printf("plugin package must be same with plugin name in manifest file\n")
		os.Exit(1)
	}

	version := manifest["version"].(string)
	tmpl, err := template.New("gen-plugin").Parse(codeTemplate)
	if err != nil {
		log.Printf("generate code failure during parse template, %+v\n", err)
		os.Exit(1)
	}

	genFileName := filepath.Join(pkgDir, filepath.Base(pkgDir)+".gen.go")
	genFile, err := os.OpenFile(genFileName, os.O_RDWR|os.O_CREATE|os.O_TRUNC, 0700) // #nosec G302
	if err != nil {
		log.Printf("generate code failure during prepare output file, %+v\n", err)
		os.Exit(1)
	}
	defer func() {
		err1 := os.Remove(genFileName)
		if err1 != nil {
			log.Printf("remove tmp file %s failure, please clean up manually at %v", genFileName, err1)
		}
	}()

	err = tmpl.Execute(genFile, manifest)
	if err != nil {
		log.Printf("generate code failure during generating code, %+v\n", err)
		os.Exit(1)
	}

	outputFile := filepath.Join(outDir, pluginName+"-"+version+".so")
	ctx := context.Background()
	buildCmd := exec.CommandContext(ctx, "go", "build",
		"-buildmode=plugin",
		"-o", outputFile, pkgDir)
	buildCmd.Dir = pkgDir
	buildCmd.Stderr = os.Stderr
	buildCmd.Stdout = os.Stdout
	buildCmd.Env = append(os.Environ(), "GO111MODULE=on")
	err = buildCmd.Run()
	if err != nil {
		log.Printf("compile plugin source code failure, %+v\n", err)
		os.Exit(1)
	}
	fmt.Printf(`Package "%s" as plugin "%s" success.`+"\nManifest:\n", pkgDir, outputFile)
	encoder := json.NewEncoder(os.Stdout)
	encoder.SetIndent(" ", "\t")
	err = encoder.Encode(manifest)
	if err != nil {
		log.Printf("print manifest detail failure, err: %v", err)
	}
}