func (n *Node) Getxattr(ctx context.Context, req *fuse.GetxattrRequest, resp *fuse.GetxattrResponse) error {
defer trace(NewGetxattrOp(req, n.path))
size, err := syscallx.Getxattr(n.path, req.Name, []byte{})
if err != nil || size <= 0 {
return fuse.ErrNoXattr
}
buffer := make([]byte, size)
size, err = syscallx.Getxattr(n.path, req.Name, buffer)
if err != nil {
return osErrorToFuseError(err)
}
resp.Xattr = buffer
return nil
}
func Get(path string, name string) (bytes []byte) {
buf := make([]byte, GetBufsize)
read, err := syscallx.Getxattr(path, name, buf)
if err == nil && read > 0 {
bytes = buf[:read]
}
return
}
func (n *Node) Removexattr(ctx context.Context, req *fuse.RemovexattrRequest) error {
defer trace(NewRemovexattrOp(req, n.path))
// TODO: this needs to be improved, since the behavior of Removexattr depends
// on the previous existance of the attribute. The return code of the operation
// is governed by the flags. See bazil.org/fuse/syscallx.Removexattr comments.
_, err := syscallx.Getxattr(n.path, req.Name, []byte{})
if err == nil {
// TODO: There is already an attribute with that name. Should return
// the expected error code according to the request's flags
err = syscallx.Removexattr(n.path, req.Name)
return osErrorToFuseError(err)
}
return nil
}
func (file *File) Getxattr(req *fuse.GetxattrRequest, res *fuse.GetxattrResponse, intr fs.Intr) fuse.Error {
// return fuse.EPERM
// fmt.Printf("Get attr: %s\n", req.Name)
buf := make([]byte, 8192)
size, err := syscallx.Getxattr(file.Path, req.Name, buf)
if err != nil {
// fmt.Printf("Get xattr error: %s - %s: \n", file.Path, req.Name, err)
// return err
// On osx, we need to return NOATTR, but this isn't built into go or bazil.org/fuse, so we need to do this:
return fuse.Errno(93)
}
res.Xattr = buf[:size]
return nil
}
func TestGetxattrSize(t *testing.T) {
t.Parallel()
f := &getxattrSize{}
mnt, err := fstestutil.MountedT(t, childMapFS{"child": f})
if err != nil {
t.Fatal(err)
}
defer mnt.Close()
n, err := syscallx.Getxattr(mnt.Dir+"/child", "whatever", nil)
if err != nil {
t.Errorf("Getxattr unexpected error: %v", err)
return
}
if g, e := n, len("hello, world"); g != e {
t.Errorf("Getxattr incorrect size: %d != %d", g, e)
}
}
func TestGetxattrTooSmall(t *testing.T) {
t.Parallel()
f := &getxattrTooSmall{}
mnt, err := fstestutil.MountedT(t, childMapFS{"child": f})
if err != nil {
t.Fatal(err)
}
defer mnt.Close()
buf := make([]byte, 3)
_, err = syscallx.Getxattr(mnt.Dir+"/child", "whatever", buf)
if err == nil {
t.Error("Getxattr = nil; want some error")
}
if err != syscall.ERANGE {
t.Errorf("unexpected error: %v", err)
return
}
}
func TestGetxattr(t *testing.T) {
t.Parallel()
f := &getxattr{}
mnt, err := fstestutil.MountedT(t, childMapFS{"child": f})
if err != nil {
t.Fatal(err)
}
defer mnt.Close()
buf := make([]byte, 8192)
n, err := syscallx.Getxattr(mnt.Dir+"/child", "not-there", buf)
if err != nil {
t.Errorf("unexpected error: %v", err)
return
}
buf = buf[:n]
if g, e := string(buf), "hello, world"; g != e {
t.Errorf("wrong getxattr content: %#v != %#v", g, e)
}
seen := f.RecordedGetxattr()
if g, e := seen.Name, "not-there"; g != e {
t.Errorf("wrong getxattr name: %#v != %#v", g, e)
}
}
func TestXattr(t *testing.T) {
condSkip(t)
inEmptyMutDir(t, func(env *mountEnv, rootDir string) {
name1 := filepath.Join(rootDir, "1")
attr1 := "attr1"
attr2 := "attr2"
contents := []byte("Some file contents")
if err := ioutil.WriteFile(name1, contents, 0644); err != nil {
t.Fatal(err)
}
buf := make([]byte, 8192)
// list empty
n, err := syscallx.Listxattr(name1, buf)
if err != nil {
t.Errorf("Error in initial listxattr: %v", err)
}
if n != 0 {
t.Errorf("Expected zero-length xattr list, got %q", buf[:n])
}
// get missing
n, err = syscallx.Getxattr(name1, attr1, buf)
if err == nil {
t.Errorf("Expected error getting non-existent xattr, got %q", buf[:n])
}
// Set (two different attributes)
err = syscallx.Setxattr(name1, attr1, []byte("hello1"), 0)
if err != nil {
t.Fatalf("Error setting xattr: %v", err)
}
err = syscallx.Setxattr(name1, attr2, []byte("hello2"), 0)
if err != nil {
t.Fatalf("Error setting xattr: %v", err)
}
// Alternate value for first attribute
err = syscallx.Setxattr(name1, attr1, []byte("hello1a"), 0)
if err != nil {
t.Fatalf("Error setting xattr: %v", err)
}
// list attrs
n, err = syscallx.Listxattr(name1, buf)
if err != nil {
t.Errorf("Error in initial listxattr: %v", err)
}
m := parseXattrList(buf[:n])
if !(len(m) == 2 && m[attr1] && m[attr2]) {
t.Errorf("Missing an attribute: %q", buf[:n])
}
// Remove attr
err = syscallx.Removexattr(name1, attr2)
if err != nil {
t.Errorf("Failed to remove attr: %v", err)
}
// List attrs
n, err = syscallx.Listxattr(name1, buf)
if err != nil {
t.Errorf("Error in initial listxattr: %v", err)
}
m = parseXattrList(buf[:n])
if !(len(m) == 1 && m[attr1]) {
t.Errorf("Missing an attribute: %q", buf[:n])
}
// Get remaining attr
n, err = syscallx.Getxattr(name1, attr1, buf)
if err != nil {
t.Errorf("Error getting attr1: %v", err)
}
if string(buf[:n]) != "hello1a" {
t.Logf("Expected hello1a, got %q", buf[:n])
}
})
}