Create cluster without using a failed task

Currently a new cluster is created by using a try/rescue
operation which always fails for a new cluster, causing
a lot of confusion due to the failed task report.

This patch implements an improvement which tests the
cluster state and creates a new one if it is not ready
without requiring the task to fail.

As the cluster creation is a single task, it's merged
into the rabbitmq_cluster.yml task file.

As the tags are all the same, the tag is set in the
main task file instead of individually on all the tasks.

Change-Id: Iaa8e429cbd1c539d8242453c0490373c758dd9fe

tasks/main.yml

@@ -66,6 +66,7 @@
 - include: rabbitmq_cluster.yml
   tags:
     - rabbitmq_server-config
+    - rabbitmq-cluster
 
 - name: Flush handlers
   meta: flush_handlers

tasks/rabbitmq_cluster.yml

@@ -13,9 +13,23 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-- include: rabbitmq_cluster_create.yml
-  static: no
+- name: Get rabbitmq cluster name
+  shell: |
+    return_code=0
+    if ! rabbitmqctl cluster_status | grep -w '<<"{{ rabbitmq_cluster_name }}">>'; then
+      rabbitmqctl set_cluster_name {{ rabbitmq_cluster_name }}
+      return_code=2
+    fi
+    exit ${return_code}
   when: ansible_hostname == rabbitmq_primary_cluster_node
+  register: _set_cluster_name
+  changed_when: _set_cluster_name.rc == 2
+  failed_when: _set_cluster_name.rc not in [0, 2]
+  # We skip ansible lint testing for this task as it fails with
+  # ANSIBLE0014 Environment variables don't work as part of command
+  # which is nonsense.
+  tags:
+    - skip_ansible_lint
 
 - include: rabbitmq_cluster_join.yml
   static: no

tasks/rabbitmq_cluster_create.yml

@@ -1,28 +0,0 @@
----
-# Copyright 2014, Rackspace US, Inc.
-#
-# Licensed under the Apache License, Version 2.0 (the "License");
-# you may not use this file except in compliance with the License.
-# You may obtain a copy of the License at
-#
-#     http://www.apache.org/licenses/LICENSE-2.0
-#
-# Unless required by applicable law or agreed to in writing, software
-# distributed under the License is distributed on an "AS IS" BASIS,
-# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-# See the License for the specific language governing permissions and
-# limitations under the License.
-
-- block:
-    - name: Get rabbitmq cluster name
-      shell: |
-        rabbitmqctl cluster_status | grep -w '<<"{{ rabbitmq_cluster_name }}">>'
-      changed_when: false
-      tags:
-        - rabbitmq-cluster
-
-  rescue:
-    - name: Create rabbitmq cluster
-      command: rabbitmqctl set_cluster_name {{ rabbitmq_cluster_name }}
-      tags:
-        - rabbitmq-cluster

tasks/rabbitmq_cluster_join.yml

@@ -21,15 +21,11 @@
       shell: |
         rabbitmqctl -q cluster_status | grep '{cluster_name,<<"{{ rabbitmq_cluster_name }}">>}'
       changed_when: false
-      tags:
-        - rabbitmq-cluster
 
   rescue:
     - name: Stop rabbitmq app
       shell: |
         rabbitmqctl stop_app; sleep 5
-      tags:
-        - rabbitmq-cluster
 
     - name: Join rabbitmq cluster
       command: >
@@ -38,8 +34,6 @@
       until: rabbit_join_cluster|success
       retries: 5
       delay: 2
-      tags:
-        - rabbitmq-cluster
 
     - name: Start rabbitmq app
       command: rabbitmqctl start_app
@@ -47,5 +41,3 @@
       until: rabbit_start_app|success
       retries: 5
       delay: 2
-      tags:
-        - rabbitmq-cluster