commit c93f5a5c548dcbd47c0e62d22a80c506a6fedc56
Author: Juan Badia Payno <jbadiapa@redhat.com>
Date:   Mon Sep 21 16:51:50 2020 +0200

    BaR: Keep /etc/exports content
    
    Currently the backup and restore role when is installing the nfs server,
    the role uses a template to generate the /etc/exports file. This means
    that if there already an nfs server installed with its configuration
    the /etc/exports will be overwritten.
    
    This patch keeps the configuration of the /etc/exports and appends
    the "new" part.
    
    Closes-Bug: #1897503
    Closes BZ: https://bugzilla.redhat.com/show_bug.cgi?id=1878480
    
    Change-Id: I0b943047be06153504fabe895711cce789621ac5
    (cherry picked from commit 6293be89a09256278d27a7af5e650154970f9786)

diff --git a/tripleo_ansible/roles/backup_and_restore/tasks/setup_nfs.yml b/tripleo_ansible/roles/backup_and_restore/tasks/setup_nfs.yml
index ce68062..711999c 100644
--- a/tripleo_ansible/roles/backup_and_restore/tasks/setup_nfs.yml
+++ b/tripleo_ansible/roles/backup_and_restore/tasks/setup_nfs.yml
@@ -85,14 +85,17 @@
   tags:
     - bar_setup_nfs_server
 
-- name: Generate NFS exports table in the server
-  become: true
-  template:
-    src: exports.j2
-    dest: /etc/exports
-    owner: root
-    group: root
-    mode: '0644'
+- name: Get the lines
+  set_fact:
+    bar_exportfs_lines: "{% for net in tripleo_backup_and_restore_nfs_clients_nets %}\
+      {{ tripleo_backup_and_restore_nfs_storage_folder }} {{ net }}(rw,sync,no_root_squash,no_subtree_check)\n{% endfor %}"
+  tags:
+    - bar_setup_nfs_server
+
+- name: NFS
+  blockinfile:
+    path: /etc/exports
+    block: "{{bar_exportfs_lines}}"
     backup: true
   tags:
     - bar_setup_nfs_server
diff --git a/tripleo_ansible/roles/backup_and_restore/templates/exports.j2 b/tripleo_ansible/roles/backup_and_restore/templates/exports.j2
deleted file mode 100644
index 96572ad..0000000
--- a/tripleo_ansible/roles/backup_and_restore/templates/exports.j2
+++ /dev/null
@@ -1,8 +0,0 @@
-# This configuration file is generated automatically
-# by the backup_and_restore role part of TripleO
-# Ansible. No not edit this file, all changes
-# will be lost. Refer to the following URL for
-# more information and implementation details:
-# https://opendev.org/openstack/tripleo-ansible
-
-{{ tripleo_backup_and_restore_nfs_storage_folder }} {% for net in tripleo_backup_and_restore_nfs_clients_nets %}{{ net }}(rw,sync,no_root_squash,no_subtree_check) {% endfor %}