text: package afero
  
  import (
  	"os"
  	"syscall"
  	"time"
  )
  
  type ReadOnlyFs struct {
  	source Fs
  }
  
  func NewReadOnlyFs(source Fs) Fs {
  	return &ReadOnlyFs{source: source}
  }
  
  func (r *ReadOnlyFs) ReadDir(name string) ([]os.FileInfo, error) {
  	return ReadDir(r.source, name)
  }
  
  func (r *ReadOnlyFs) Chtimes(n string, a, m time.Time) error {
  	return syscall.EPERM
  }
  
  func (r *ReadOnlyFs) Chmod(n string, m os.FileMode) error {
  	return syscall.EPERM
  }
  
  func (r *ReadOnlyFs) Name() string {
  	return "ReadOnlyFilter"
  }
  
  func (r *ReadOnlyFs) Stat(name string) (os.FileInfo, error) {
  	return r.source.Stat(name)
  }
  
  func (r *ReadOnlyFs) Rename(o, n string) error {
  	return syscall.EPERM
  }
  
  func (r *ReadOnlyFs) RemoveAll(p string) error {
  	return syscall.EPERM
  }
  
  func (r *ReadOnlyFs) Remove(n string) error {
  	return syscall.EPERM
  }
  
  func (r *ReadOnlyFs) OpenFile(name string, flag int, perm os.FileMode) (File, error) {
  	if flag&(os.O_WRONLY|syscall.O_RDWR|os.O_APPEND|os.O_CREATE|os.O_TRUNC) != 0 {
  		return nil, syscall.EPERM
  	}
  	return r.source.OpenFile(name, flag, perm)
  }
  
  func (r *ReadOnlyFs) Open(n string) (File, error) {
  	return r.source.Open(n)
  }
  
  func (r *ReadOnlyFs) Mkdir(n string, p os.FileMode) error {
  	return syscall.EPERM
  }
  
  func (r *ReadOnlyFs) MkdirAll(n string, p os.FileMode) error {
  	return syscall.EPERM
  }
  
  func (r *ReadOnlyFs) Create(n string) (File, error) {
  	return nil, syscall.EPERM
  }
  