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