github.com/gozelle/afero@v0.0.0-20230510083704-09e2ff18f19e/readonlyfs.go (about)

     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  }