Allowing ability to specify a logging namespace and override check to install in two different namespaces

roles/openshift_logging/tasks/main.yaml

@@ -26,26 +26,64 @@
     selector: "logging-infra,provider=openshift"
   register: _logging_dcs
 
-- assert:
-    that:
-    - _logging_dcs.results.results[0]['items'] | map(attribute='metadata.namespace') | list | unique | count <= 1
-    msg: "Found aggregated logging deploymentconfigs in multiple namespaces which is not supported"
-  when:
-  - _logging_dcs is defined
-  - _logging_dcs.results | count > 0
-
 - set_fact:
-    _logging_namespace: "{{ _logging_dcs.results.results[0]['items'] | map(attribute='metadata.namespace') | list | unique | join('') }}"
+    _current_logging_namespace: "{{ _logging_dcs.results.results[0]['items'] | map(attribute='metadata.namespace') | list | unique | join(' ') }}"
   when:
   - _logging_dcs is defined
   - _logging_dcs.results | count > 0
   - _logging_dcs.results.results | count > 0
 
-- debug:
-    msg: "Using the namespace '{{ _logging_namespace }}' which has an existing deployment"
-  when:
+- when:
+  - logging_disable_namespace_check | default(false) | bool
   - _logging_namespace is defined
-  - _logging_namespace | count > 0
+  - _current_logging_namespace.split(" ") | count > 0
+  - _current_logging_namespace != ''
+  - _logging_namespace != _current_logging_namespace
+  block:
+  - name: Set Logging message about installing in multiple namespaces
+    run_once: true
+    set_stats:
+      data:
+        installer_phase_logging:
+          message: "Aggregated logging installed in multiple namespaces:   \
+                      current namespace(s): {{ _current_logging_namespace }}   \
+                      specified namespace: {{ _logging_namespace | default(_current_logging_namespace) }}"
+
+  - debug:
+      msg: "Aggregated logging installed in multiple namespaces:   \
+              current namespace(s): {{ _current_logging_namespace }}   \
+              specified namespace: {{ _logging_namespace | default(_current_logging_namespace) }}"
+
+- when: not logging_disable_namespace_check | default(false) | bool
+  block:
+  - assert:
+      that:
+      - _current_logging_namespace.split(" ") | count <= 1
+      - not _logging_namespace is defined or not _current_logging_namespace or _logging_namespace == _current_logging_namespace
+      msg: "Configuring aggregated logging in multiple namespaces is not supported:   \
+              current namespace(s): {{ _current_logging_namespace }}   \
+              specified namespace: {{ _logging_namespace | default(_current_logging_namespace) }}"
+
+  - debug:
+      msg: "Using the namespace '{{ _current_logging_namespace }}' which has an existing deployment"
+    when:
+    - _current_logging_namespace is defined
+    - _current_logging_namespace != ''
+
+  - set_fact:
+      _logging_namespace: "{{ _current_logging_namespace if _current_logging_namespace else _logging_namespace | default('openshift-logging') }}"
+
+- when:
+  - logging_disable_namespace_check | default(false) | bool
+  - not _logging_namespace is defined
+  block:
+  - assert:
+      that:
+      - _current_logging_namespace.split(" ") | count == 1
+      msg: "Multiple aggregated logging installations found in [{{ _current_logging_namespace }}], please specify which to use with _logging_namespace"
+
+  - set_fact:
+      _logging_namespace: "{{ _current_logging_namespace }}"
 
 - set_fact:
     openshift_logging_namespace: "{{ _logging_namespace if _logging_namespace else 'openshift-logging' }}"