fs

type File interface {
	io.Closer
	io.Reader
	io.ReaderAt
	io.Seeker
	io.Writer
	io.WriterAt
	Stat() (os.FileInfo, error)
}

type FileInfo interface {
	Name() string       // base name of the file
	Size() int64        // length in bytes for regular files; system-dependent for others
	Mode() os.FileMode  // file mode bits
	ModTime() time.Time // modification time
	IsDir() bool        // abbreviation for Mode().IsDir()
	Sys() interface{}   // underlying data source (can return nil)
}

type FileMode os.FileMode

type FileSystem interface {
	NewFile(fd uintptr, name string) File
	Create(name string) (File, error)
	Open(name string) (File, error)
	Stat(name string) (FileInfo, error)
	RemoveAll(name string) error
	MkdirAll(name string, mode FileMode) error
	ReadFile(filename string) ([]byte, error)
	WriteFile(filename string, data []byte, mode FileMode) error
}