Function linearize_output

common/psbt_open.c:102–140

}

static const u8 *linearize_output(const tal_t *ctx,
				  const struct wally_psbt *parent,
				  size_t index)
{
	struct wally_psbt *copy = clone_psbt(NULL, parent);
	struct wally_psbt *psbt = create_psbt(NULL, 0, 1, 0);
	struct wally_psbt_output dummy_out;
	size_t byte_len;
	struct bitcoin_outpoint outpoint;

	/* Add a 'fake' non-zero input so libwally will agree to linearize the tx */
	memset(&outpoint, 1, sizeof(outpoint));
	psbt_append_input(psbt, &outpoint, 0, NULL, NULL, NULL);

	dummy_out = psbt->outputs[0];
	psbt->outputs[0] = copy->outputs[index];
	psbt->num_outputs = 1;

	/* Sort the outputs, so serializing them is ok */
	wally_map_sort(&psbt->outputs[0].unknowns, 0);

	/* We don't care if the keypaths change */
	psbt->outputs[0].keypaths.num_items = 0;
	psbt->outputs[0].taproot_leaf_hashes.num_items = 0;
	psbt->outputs[0].taproot_leaf_paths.num_items = 0;
	/* And you can add scripts, no problem */
	wally_psbt_output_set_witness_script(&psbt->outputs[0], NULL, 0);
	wally_psbt_output_set_redeem_script(&psbt->outputs[0], NULL, 0);

	const u8 *bytes = psbt_get_bytes(ctx, psbt, &byte_len);

	psbt->outputs[0] = dummy_out;
	psbt->num_outputs = 0;

	tal_free(psbt);
	tal_free(copy);

	return bytes;
}

static bool input_identical(const struct wally_psbt *a,
			    size_t a_index,