Introduce ExternalCeph boolean

Add explicit parameter for when external ceph is used.
This parameter defaults to false but is true if the
deployment uses -e environments/external-ceph.yaml.

When external ceph is used with Ganesha, the ceph_mon
group is empty but the ceph_nfs group is not. When
internal ceph is used with Ganesha, both the ceph_mon
and ceph_nfs groups are non-empty. Rather than solve
the related bug by adding another condition based on
these groups  which is compatible existing logic, it's
safer to have an explicit parameter for when external
ceph is used.

Change-Id: Id3e397d81dbca9a48d0456588784bcc20737093f
Depends-On: I2651c2850debd8110da93df2adc5fd8768a00db0
Closes-Bug: #1986988

deployment/cephadm/ceph-base.yaml

@@ -364,6 +364,12 @@ parameters:
     description: |
       Use the default continer defined in cephadm instead of
       the one defined in container_image_prepare_defaults.yaml.
+  ExternalCeph:
+    default: false
+    type: boolean
+    description: |
+      If the Ceph cluster has been deployed outside of TripleO.
+      DeployedCeph and ExternalCeph are mutually exclusive.
 
 parameter_groups:
 - label: deprecated
@@ -570,7 +576,9 @@ outputs:
               include_role:
                 name: tripleo_run_cephadm
                 tasks_from: enable_ceph_admin_user.yml
-              when: (not deployed_ceph and
+              when:
+                - not external_ceph
+                - (not deployed_ceph and
                       (groups['ceph_mon'] | default([]) | length > 0 or
                        groups['ceph_nfs'] | default([]) | length > 0))
                     or
@@ -592,20 +600,28 @@ outputs:
                         groups['ceph_rbdmirror'] | default([]) | length > 0)))
               vars:
                 deployed_ceph: {get_param: DeployedCeph}
+                external_ceph: {get_param: ExternalCeph}
             - name: Deploy or configure the cephadm Ceph cluster
               include_role:
                 name: tripleo_run_cephadm
-              when: groups['ceph_mon'] | default([]) | length > 0 or
-                    groups['ceph_nfs'] | default([]) | length > 0
+              when:
+                - not external_ceph
+                - groups['ceph_mon'] | default([]) | length > 0 or
+                  groups['ceph_nfs'] | default([]) | length > 0
+              vars:
+                external_ceph: {get_param: ExternalCeph}
         - name: ceph_base_external_deploy_task
           when:
             - (step | int) == 3
             - {get_param: DisableCephadm}
+            - not external_ceph
           block:
             - name: Pause cephadm
               include_role:
                 name: tripleo_run_cephadm
                 tasks_from: disable_cephadm.yml
+          vars:
+            external_ceph: {get_param: ExternalCeph}
       post_upgrade_tasks:
         - name: Clean puppet-ceph package
           when:

deployment/cephadm/ceph-client.yaml

@@ -148,6 +148,8 @@ outputs:
                 when:
                   - groups['ceph_mon'] | default([]) | length == 0
                   - groups['ceph_nfs'] | default([]) | length > 0
+                vars:
+                  tripleo_cephadm_config_home: {get_param: CephConfigPath}
       external_update_tasks: []
       external_upgrade_tasks: []
       config_settings: {}

environments/external-ceph.yaml

@@ -6,6 +6,7 @@ parameter_defaults:
   #CephClusterFSID: '4b5c8c0a-ff60-454b-a1b4-9747aa737d19'
   #CephClientKey: 'AQDLOh1VgEp6FRAAFzT7Zw+Y9V6JJExQAsRnRQ=='
   #CephExternalMonHost: '172.16.1.7, 172.16.1.8'
+  ExternalCeph: true
 
   # the following parameters enable Ceph backends for Cinder, Glance, Gnocchi and Nova
   NovaEnableRbdBackend: true