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
View as plain text