Golang文件备份方法与实现步骤

func copyFile(src, dst string) error {
    sourceFile, err := os.Open(src)
    if err != nil {
        return err
    }
    defer sourceFile.Close()

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

    _, err = io.Copy(destFile, sourceFile)
    if err != nil {
        return err
    }

    // 确保写入磁盘
    return destFile.Sync()
}

func backupDirectory(srcDir, backupDir string) error {
    return filepath.Walk(srcDir, func(path string, info os.FileInfo, err error) error {
        if err != nil {
            return err
        }

        // 计算相对路径
        relPath, err := filepath.Rel(srcDir, path)
        if err != nil {
            return err
        }

        destPath := filepath.Join(backupDir, relPath)

        if info.IsDir() {
            return os.MkdirAll(destPath, info.Mode())
        }

        return copyFile(path, destPath)
    })
}

func getBackupPath(base string) string {
    timestamp := time.Now().Format("20060102_150405")
    return filepath.Join(base, "backup_"+timestamp)
}

backupDir := getBackupPath("./backups")
os.MkdirAll(backupDir, 0755)
err := backupDirectory("/data/app", backupDir)

func safeCopy(src, dst string) {
    err := copyFile(src, dst)
    if err != nil {
        log.Printf("Failed to backup %s -> %s: %v", src, dst, err)
    } else {
        log.Printf("Backed up: %s", src)
    }
}