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: main.go
    path of file: ./repos/xorm/vendor/github.com/syndtr/goleveldb/manualtest/filelock
    
    the code of the file until where you have to start completion: package main

import (
	"bufio"
	"bytes"
	"flag"
	"fmt"
	"os"
	"os/exec"
	"path/filepath"

	"github.com/syndtr/goleveldb/leveldb/storage"
)

var (
	filename string
	child    bool
)

func init() {
	flag.StringVar(&filename, "filename", filepath.Join(os.TempDir(), "goleveldb_filelock_test"), "Filename used for testing")
	flag.BoolVar(&child, "child", false, "This is the child")
}

func runChild() error {
	var args []string
	args = append(args, os.Args[1:]...)
	args = append(args, "-child")
	cmd := exec.Command(os.Args[0], args...)
	var out bytes.Buffer
	cmd.Stdout = &out
	err := cmd.Run()
	r := bufio.NewReader(&out)
	for {
		line, _, e1 := r.ReadLine()
		if e1 != nil {
			break
		}
		fmt.Print
    
func main() {
	flag.Parse()

	fmt.Printf("Using path: %s\n", filename)
	if child {
		fmt.Println("Child flag set.")
	}

	stor, err := storage.OpenFile(filename, false)
	if err != nil {
		fmt.Printf("Could not open storage: %s", err)
		os.Exit(10)
	}

	if !child {
		fmt.Println("Executing child -- first test (expecting error)")
		err := runChild()
		if err == nil {
			fmt.Println("Expecting error from child")
		} else if err.Error() != "exit status 10" {
			fmt.Println("Got unexpected error from child:", err)
		} else {
			fmt.Printf("Got error from child: %s (expected)\n", err)
		}
	}

	err = stor.Close()
	if err != nil {
		fmt.Printf("Error when closing storage: %s", err)
		os.Exit(11)
	}

	if !child {
		fmt.Println("Executing child -- second test")
		err := runChild()
		if err != nil {
			fmt.Println("Got unexpected error from child:", err)
		}
	}

	os.RemoveAll(filename)
}