readonlyfs.go raw

   1  package afero
   2  
   3  import (
   4  	"os"
   5  	"syscall"
   6  	"time"
   7  )
   8  
   9  var _ Lstater = (*ReadOnlyFs)(nil)
  10  
  11  type ReadOnlyFs struct {
  12  	source Fs
  13  }
  14  
  15  func NewReadOnlyFs(source Fs) Fs {
  16  	return &ReadOnlyFs{source: source}
  17  }
  18  
  19  func (r *ReadOnlyFs) ReadDir(name string) ([]os.FileInfo, error) {
  20  	return ReadDir(r.source, name)
  21  }
  22  
  23  func (r *ReadOnlyFs) Chtimes(n string, a, m time.Time) error {
  24  	return syscall.EPERM
  25  }
  26  
  27  func (r *ReadOnlyFs) Chmod(n string, m os.FileMode) error {
  28  	return syscall.EPERM
  29  }
  30  
  31  func (r *ReadOnlyFs) Chown(n string, uid, gid int) error {
  32  	return syscall.EPERM
  33  }
  34  
  35  func (r *ReadOnlyFs) Name() string {
  36  	return "ReadOnlyFilter"
  37  }
  38  
  39  func (r *ReadOnlyFs) Stat(name string) (os.FileInfo, error) {
  40  	return r.source.Stat(name)
  41  }
  42  
  43  func (r *ReadOnlyFs) LstatIfPossible(name string) (os.FileInfo, bool, error) {
  44  	if lsf, ok := r.source.(Lstater); ok {
  45  		return lsf.LstatIfPossible(name)
  46  	}
  47  	fi, err := r.Stat(name)
  48  	return fi, false, err
  49  }
  50  
  51  func (r *ReadOnlyFs) SymlinkIfPossible(oldname, newname string) error {
  52  	return &os.LinkError{Op: "symlink", Old: oldname, New: newname, Err: ErrNoSymlink}
  53  }
  54  
  55  func (r *ReadOnlyFs) ReadlinkIfPossible(name string) (string, error) {
  56  	if srdr, ok := r.source.(LinkReader); ok {
  57  		return srdr.ReadlinkIfPossible(name)
  58  	}
  59  
  60  	return "", &os.PathError{Op: "readlink", Path: name, Err: ErrNoReadlink}
  61  }
  62  
  63  func (r *ReadOnlyFs) Rename(o, n string) error {
  64  	return syscall.EPERM
  65  }
  66  
  67  func (r *ReadOnlyFs) RemoveAll(p string) error {
  68  	return syscall.EPERM
  69  }
  70  
  71  func (r *ReadOnlyFs) Remove(n string) error {
  72  	return syscall.EPERM
  73  }
  74  
  75  func (r *ReadOnlyFs) OpenFile(name string, flag int, perm os.FileMode) (File, error) {
  76  	if flag&(os.O_WRONLY|syscall.O_RDWR|os.O_APPEND|os.O_CREATE|os.O_TRUNC) != 0 {
  77  		return nil, syscall.EPERM
  78  	}
  79  	return r.source.OpenFile(name, flag, perm)
  80  }
  81  
  82  func (r *ReadOnlyFs) Open(n string) (File, error) {
  83  	return r.source.Open(n)
  84  }
  85  
  86  func (r *ReadOnlyFs) Mkdir(n string, p os.FileMode) error {
  87  	return syscall.EPERM
  88  }
  89  
  90  func (r *ReadOnlyFs) MkdirAll(n string, p os.FileMode) error {
  91  	return syscall.EPERM
  92  }
  93  
  94  func (r *ReadOnlyFs) Create(n string) (File, error) {
  95  	return nil, syscall.EPERM
  96  }
  97