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: legacy.go
    path of file: ./repos/gitea/modules/util
    
    the code of the file until where you have to start completion: // Copyright 2022 The Gitea Authors. All rights reserved.
// SPDX-License-Identifier: MIT

package util

import (
	"crypto/aes"
	"crypto/cipher"
	"crypto/rand"
	"errors"
	"io"
	"os"
)

// CopyFile copies file from source to target path.
func CopyFile(src, dest string) error {
	si, err := os.Lstat(src)
	if err != nil {
		return err
	}

	sr, err := os.Open(src)
	if err != nil {
		retur
    
func CopyFile(src, dest string) error {
	si, err := os.Lstat(src)
	if err != nil {
		return err
	}

	sr, err := os.Open(src)
	if err != nil {
		return err
	}
	defer sr.Close()

	dw, err := os.Create(dest)
	if err != nil {
		return err
	}
	defer dw.Close()

	if _, err = io.Copy(dw, sr); err != nil {
		return err
	}

	if err = os.Chtimes(dest, si.ModTime(), si.ModTime()); err != nil {
		return err
	}
	return os.Chmod(dest, si.Mode())
}