gtsocial-umbx

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readonlyfs.go (2120B)

      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 }