How to retrieve proper union leafref path?

[bradh352]

I'm trying to look up back references to paths, and I have it reasonably working for normal leafref nodes, and they can return a path like:

/yolo-leafref-search:my_list/my_leaf_string

Which is generated when passing the struct lysc_node * to lysc_path().

However, when processing a union, we're dealing with a different set of data structures and do something like:

leaf = (const struct lysc_node_leaf *)node;
if (leaf->type->basetype == LY_TYPE_UNION) {
  const struct lysc_type_union *un = (const struct lysc_type_union *)leaf->type;
  for (i=0; i<LY_ARRAY_COUNT(un->types); i++) {
    const struct lysc_type *utype = un->types[i];

    if (utype->basetype != LY_TYPE_LEAFREF) {
      continue;
     }

    const struct lysc_type_leafref *lref = (const struct lysc_type_leafref *)utype;
    printf("union leafref path: %s\n", lyxp_get_expr(lref->path));
  }

The problem is, when the leaf reference is pointing to the same node, we get:
/leafref-search:my_list/leafref-search:my_leaf_string
instead, which is using the prefix instead of the module name.

How can I derive the same path as lysc_path()? I tried passing the returned path through lys_find_xpath() and lys_find_path() in the hopes of getting a handle to the node that I could run lysc_path() on, but both threw errors. I don't mind jumping through some hoops, just need to know how.

I'm porting SONiC from libyang1 to libyang3, and they use backlinks. I'm working on a patch for libyang-python with this support, it contains the test cases and yang files:
CESNET/libyang-python@master...bradh352:libyang-python:backlinks

[bradh352]

nevermind, I figured it out, see CESNET/libyang-python#132