// Rename implements the fs.NodeRenamer interface for Dir.
func (d *Dir) Rename(ctx context.Context, req *fuse.RenameRequest,
newDir fs.Node) (err error) {
d.folder.fs.log.CDebugf(ctx, "Dir Rename %s -> %s",
req.OldName, req.NewName)
defer func() { d.folder.reportErr(ctx, libkbfs.WriteMode, err) }()
var realNewDir *Dir
switch newDir := newDir.(type) {
case *Dir:
realNewDir = newDir
case *TLF:
var err error
realNewDir, err = newDir.loadDir(ctx)
if err != nil {
return err
}
default:
// The destination is not a TLF instance, probably
// because it's Root (or some other node type added
// later). The kernel won't let a rename newDir point
// to a non-directory.
//
// We have no cheap atomic rename across folders, so
// we can't serve this. EXDEV makes `mv` do a
// copy+delete, and the Lookup on the destination path
// will decide whether it's legal.
return fuse.Errno(syscall.EXDEV)
}
if d.folder != realNewDir.folder {
// Check this explicitly, not just trusting KBFSOps.Rename to
// return an error, because we rely on it for locking
// correctness.
return fuse.Errno(syscall.EXDEV)
}
// overwritten node, if any, will be removed from Folder.nodes, if
// it is there in the first place, by its Forget
if err := d.folder.fs.config.KBFSOps().Rename(
ctx, d.node, req.OldName, realNewDir.node, req.NewName); err != nil {
return err
}
return nil
}
func isDir(node fs.Node) bool {
return (node.Attr().Mode & os.ModeDir) != 0
}