Add Manila CephNFS support

This patch introduces a set of basic tasks to perform the adoption of
Manila with a CephNFS backend.
Before performing the actual adoption, a new CephNFS cephadm based
cluster must be created. For this reason, the manila_nfs tasks require a
few parameters as input:

1. A new CephNFS VIP where the CephIngress daemon (made by Haproxy and
   keepalived) is created;
2. A set of target nodes where the "nfs" label is added: these nodes are
   supposed to host the new CephNFS cluster and must be different from
   controller nodes that are going to be decommisioned;
3. The TripleO managed Ganesha VIP: this input can be actually retrieved
   by the existing TripleO deployment, but we can gather this input as
   part of the next iteration on this patch

After the new CephNFS cluster is created, it is possible to build
manila-share with the proper configuration.

Signed-off-by: Francesco Pantano <[email protected]>

tests/roles/manila_adoption/defaults/main.yaml

@@ -1,2 +1,3 @@
 # manila_backend can be 'cephfs' or 'cephnfs'
 manila_backend: cephfs
+ganesha_default_path: "/etc/ganesha/ganesha.conf"

tests/roles/manila_adoption/tasks/main.yaml

@@ -1,19 +1,42 @@
+- name: Check the required input when manila_backend is NFS
+  when: manila_backend == "cephnfs"
+  block:
+    - name: set shell vars to connect to controller1
+      no_log: "{{ use_no_log }}"
+      ansible.builtin.set_fact:
+        controller_ssh: |
+          CONTROLLER1_SSH="{{ controller1_ssh }}"
+
+    - name: Get ceph-nfs IP Address
+      become: true
+      ansible.builtin.shell: |
+        {{ shell_header }}
+        {{ controller_ssh }}
+        ${CONTROLLER1_SSH} awk -F '[=;]' '/Bind_Addr/ {gsub(/ /, "", $2); print $2}' {{ ganesha_default_path }}
+      register: cephnfs_vip
+
+    - name: Fail if the OLD Ganesha VIP is not a good input value
+      when:
+        - not (cephnfs_vip | ansible.builtin.ipaddr)
+      ansible.builtin.fail:
+        msg: "The (TRIPLEO) gathered Ganesha server IP is malformed"
+
 - name: Deploy Podified Manila
   when: manila_backend == "cephfs" or manila_backend == "cephnfs"
   block:
-    - name: generate CR config based on the selected backend
+    - name: Generate CR config based on the selected backend
       ansible.builtin.template:
         src: manila_cephfs.yaml.j2
         dest: /tmp/manila_cephfs.yaml
         mode: "0600"
 
-    - name: deploy podified Manila with cephfs backend
+    - name: Deploy podified Manila with cephfs backend
       ansible.builtin.shell: |
         {{ shell_header }}
         {{ oc_header }}
         oc patch openstackcontrolplane openstack --type=merge --patch-file=/tmp/manila_cephfs.yaml
 
-- name: wait for Manila to start up
+- name: Wait for Manila to start up
   ansible.builtin.shell: |
     {{ shell_header }}
     {{ oc_header }}
@@ -25,7 +48,7 @@
   retries: 60
   delay: 2
 
-- name: check that Manila is reachable and its endpoints are defined
+- name: Check that Manila is reachable and its endpoints are defined
   ansible.builtin.shell: |
     {{ shell_header }}
     {{ oc_header }}