Map nicX abstraction to phys interface name

Map os-net-config nicX abstraction to physical interface names.

  $ os-net-config -i
  {'nic1': 'eth0', 'nic2': 'eth1'}

Change-Id: I34a2da66d24a20926394be32e2679f316c821ac6

tripleo_ansible/roles/tripleo_frr/tasks/main.yml

@@ -1,5 +1,5 @@
 ---
-# Copyright 2020 Red Hat, Inc.
+# Copyright 2021 Red Hat, Inc.
 # All Rights Reserved.
 #
 # Licensed under the Apache License, Version 2.0 (the "License"); you may
@@ -23,6 +23,26 @@
     selevel: s0
     setype: container_file_t
 
+- name: identify the real interfaces via os-net-config
+  shell: os-net-config -i
+  register: os_net_config_result
+
+- name: os-net-config from json
+  set_fact:
+    iface_map: "{{ os_net_config_result.stdout }}"
+
+- name: FRR uplink interfaces
+  block:
+    - name: construct FRR uplink interfaces from os-net-config mappings
+      set_fact:
+        tripleo_frr_bgp_uplinks_mapped: "{{ tripleo_frr_bgp_uplinks | map('extract', iface_map) | list }}"
+  rescue:
+    - name: failed to construct FRR uplink interfaces
+      ansible.builtin.fail:
+        msg: |
+          Failed to map at least one interface from {{ tripleo_frr_bgp_uplinks }} to {{ iface_map }}.
+          Please check value of Ansible variable tripleo_frr_bgp_uplinks.
+
 - name: configure FRR
   become: true
   ansible.builtin.template:

tripleo_ansible/roles/tripleo_frr/templates/frr.conf.j2

@@ -15,7 +15,7 @@ router bgp {{ tripleo_frr_bgp_asn }}
 {% if tripleo_frr_bfd %}
   neighbor uplink bfd
 {% endif %}
-{% for iface in tripleo_frr_bgp_uplinks %}
+{% for iface in tripleo_frr_bgp_uplinks_mapped %}
   neighbor {{ iface }} interface peer-group uplink
 {% endfor %}