func hasChild(ds mdag.LinkService, root *cid.Cid, child *cid.Cid) (bool, error) {
links, err := ds.GetLinks(context.Background(), root)
if err != nil {
return false, err
}
for _, lnk := range links {
c := lnk.Cid
if lnk.Cid.Equals(child) {
return true, nil
}
has, err := hasChild(ds, c, child)
if err != nil {
return false, err
}
if has {
return has, nil
}
}
return false, nil
}
