1package afero 2 3import ( 4 "os" 5 "syscall" 6 "time" 7) 8 9var _ Lstater = (*ReadOnlyFs)(nil) 10 11type ReadOnlyFs struct { 12 source Fs 13} 14 15func NewReadOnlyFs(source Fs) Fs { 16 return &ReadOnlyFs{source: source} 17} 18 19func (r *ReadOnlyFs) ReadDir(name string) ([]os.FileInfo, error) { 20 return ReadDir(r.source, name) 21} 22 23func (r *ReadOnlyFs) Chtimes(n string, a, m time.Time) error { 24 return syscall.EPERM 25} 26 27func (r *ReadOnlyFs) Chmod(n string, m os.FileMode) error { 28 return syscall.EPERM 29} 30 31func (r *ReadOnlyFs) Chown(n string, uid, gid int) error { 32 return syscall.EPERM 33} 34 35func (r *ReadOnlyFs) Name() string { 36 return "ReadOnlyFilter" 37} 38 39func (r *ReadOnlyFs) Stat(name string) (os.FileInfo, error) { 40 return r.source.Stat(name) 41} 42 43func (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 51func (r *ReadOnlyFs) SymlinkIfPossible(oldname, newname string) error { 52 return &os.LinkError{Op: "symlink", Old: oldname, New: newname, Err: ErrNoSymlink} 53} 54 55func (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 63func (r *ReadOnlyFs) Rename(o, n string) error { 64 return syscall.EPERM 65} 66 67func (r *ReadOnlyFs) RemoveAll(p string) error { 68 return syscall.EPERM 69} 70 71func (r *ReadOnlyFs) Remove(n string) error { 72 return syscall.EPERM 73} 74 75func (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 82func (r *ReadOnlyFs) Open(n string) (File, error) { 83 return r.source.Open(n) 84} 85 86func (r *ReadOnlyFs) Mkdir(n string, p os.FileMode) error { 87 return syscall.EPERM 88} 89 90func (r *ReadOnlyFs) MkdirAll(n string, p os.FileMode) error { 91 return syscall.EPERM 92} 93 94func (r *ReadOnlyFs) Create(n string) (File, error) { 95 return nil, syscall.EPERM 96} 97