// Lookup implements the fs.NodeRequestLookuper interface.
func (fl *FolderList) Lookup(ctx context.Context, req *fuse.LookupRequest, resp *fuse.LookupResponse) (node fs.Node, err error) {
fl.fs.log.CDebugf(ctx, "FL Lookup %s", req.Name)
defer func() {
fl.reportErr(ctx, libkbfs.ReadMode,
libkbfs.CanonicalTlfName(req.Name), err)
}()
fl.mu.Lock()
defer fl.mu.Unlock()
specialNode := handleSpecialFile(req.Name, fl.fs, resp)
if specialNode != nil {
return specialNode, nil
}
if child, ok := fl.folders[req.Name]; ok {
return child, nil
}
// Shortcut for dreaded extraneous OSX finder lookups
if strings.HasPrefix(req.Name, "._") {
return nil, fuse.ENOENT
}
h, err := libkbfs.ParseTlfHandle(
ctx, fl.fs.config.KBPKI(), req.Name, fl.public,
fl.fs.config.SharingBeforeSignupEnabled())
switch err := err.(type) {
case nil:
// No error.
break
case libkbfs.TlfNameNotCanonical:
// Only permit Aliases to targets that contain no errors.
if !fl.isValidAliasTarget(ctx, err.NameToTry) {
fl.fs.log.CDebugf(ctx, "FL Refusing alias to non-valid target %q", err.NameToTry)
return nil, fuse.ENOENT
}
// Non-canonical name.
n := &Alias{
canon: err.NameToTry,
}
return n, nil
case libkbfs.NoSuchNameError, libkbfs.BadTLFNameError:
// Invalid public TLF.
return nil, fuse.ENOENT
default:
// Some other error.
return nil, err
}
child := newTLF(fl, h)
fl.folders[req.Name] = child
return child, nil
}
// Returns a nil node if p doesn't have type tlfPath.
func (p kbfsPath) getNode(ctx context.Context, config libkbfs.Config) (n libkbfs.Node, ei libkbfs.EntryInfo, err error) {
if p.pathType != tlfPath {
ei := libkbfs.EntryInfo{
Type: libkbfs.Dir,
}
return nil, ei, nil
}
var h *libkbfs.TlfHandle
name := p.tlfName
outer:
for {
h, err = libkbfs.ParseTlfHandle(
ctx, config.KBPKI(), name, p.public,
config.SharingBeforeSignupEnabled())
switch err := err.(type) {
case nil:
// No error.
break outer
case libkbfs.TlfNameNotCanonical:
// Non-canonical name, so try again.
name = err.NameToTry
default:
// Some other error.
return nil, libkbfs.EntryInfo{}, err
}
}
n, ei, err =
config.KBFSOps().GetOrCreateRootNode(
ctx, h, libkbfs.MasterBranch)
for _, component := range p.tlfComponents {
cn, cei, err := config.KBFSOps().Lookup(ctx, n, component)
if err != nil {
return nil, libkbfs.EntryInfo{}, err
}
n = cn
ei = cei
}
return n, ei, nil
}