Update Ceph client service to handle external Ceph

Update the Ceph client service to handle the external
Ceph usecase by ensuring that CephClientConfigVars has
the CephExternalMonHost and CephClusterFSID which were
missing and caused bug 1961096.

Closes-Bug: 1961096
Change-Id: I20335bc2850951926c1a9e9ea0ab761c2c18bb3f
(cherry picked from commit a2674a176d)

deployment/cephadm/ceph-client.yaml

@@ -67,6 +67,13 @@ parameters:
     default: "{{ playbook_dir }}/cephadm/ceph_client.yml"
     type: string
     description: The undercloud path where cephadm exports the Ceph Client configuration.
+  CephClusterFSID:
+    type: string
+    description: The Ceph cluster FSID. Must be a UUID.
+  CephExternalMonHost:
+    default: ''
+    type: string
+    description: List of externally managed Ceph Mon Host IPs. Only used for external Ceph deployments.
 
 resources:
   CephBase:
@@ -99,6 +106,25 @@ outputs:
           - name: Configure Ceph Clients
             when: step|int == 2
             block:
+              - name: Check if the input variable file exists
+                stat:
+                  path: "{{ tripleo_ceph_client_vars }}"
+                register: ceph_input_vars
+                vars:
+                  tripleo_ceph_client_vars: {get_param: CephClientConfigVars}
+              - name: Populate CephClientConfigVars from THT
+                copy:
+                  dest: "{{ tripleo_ceph_client_vars }}"
+                  content: |
+                    tripleo_ceph_client_fsid: "{{ tripleo_ceph_client_fsid }}"
+                    external_cluster_mon_ips: "{{ external_cluster_mon_ips }}"
+                when:
+                  - ceph_input_vars.stat.exists == False
+                  - external_cluster_mon_ips | length > 0
+                vars:
+                  tripleo_ceph_client_vars: {get_param: CephClientConfigVars}
+                  tripleo_ceph_client_fsid: {get_param: CephClusterFSID}
+                  external_cluster_mon_ips: {get_param: CephExternalMonHost}
               - name: configure ceph clients
                 include_role:
                   name: tripleo_ceph_client

environments/external-ceph.yaml

@@ -1,5 +1,5 @@
 resource_registry:
-  OS::TripleO::Services::CephExternal: ../deployment/cephadm/ceph-external.yaml
+  OS::TripleO::Services::CephExternal: ../deployment/cephadm/ceph-client.yaml
 
 parameter_defaults:
   # NOTE: These example parameters are required when using CephExternal