Add ability to change apt/yum package state

The current method of installing the distribution packages required is
set in the tasks and cannot be changed by a deployer.

Currently the apt task always installs the latest package. This results
in unexpected binary changes when a deployer may simply be trying to
execute a configuration change.

This patch adds the ability for a deployer to change the desired state
so that the results are predictable.

Change-Id: I3227dc6f15e0307926e65427bc635c34e2baa87f

defaults/main.yml

@@ -16,6 +16,10 @@
 ## APT Cache Options
 cache_timeout: 600
 
+# Set the package install state for distribution packages
+# Options are 'present' and 'latest'
+rabbitmq_package_state: "latest"
+
 # Inventory group containing the hosts for the cluster
 rabbitmq_host_group: "rabbitmq_all"
 

releasenotes/notes/package-state-bb93a1d4b272425d.yaml

@@ -0,0 +1,13 @@
+---
+features:
+  - The rabbitmq_server role now supports the ability to configure whether
+    apt/yum tasks install the latest available package, or just ensure
+    that the package is present. The default action is to ensure that
+    the latest package is present. The action taken may be changed to
+    only ensure that the package is present by setting
+    ``rabbitmq_package_state`` to ``present``.
+upgrade:
+  - The rabbitmq_server role always checks whether the latest package is
+    installed when executed. If a deployer wishes to change the check to
+    only validate the presence of the package, the option
+    ``rabbitmq_package_state`` should be set to ``present``.

tasks/install_apt.yml

@@ -33,7 +33,7 @@
 - name: Install RabbitMQ package dependencies
   apt:
     pkg: "{{ item }}"
-    state: latest
+    state: "{{ rabbitmq_package_state }}"
   register: install_packages
   until: install_packages|success
   retries: 5

tasks/install_yum.yml

@@ -24,7 +24,7 @@
 - name: Install RabbitMQ package dependencies
   yum:
     pkg: "{{ item }}"
-    state: latest
+    state: "{{ rabbitmq_package_state }}"
     update_cache: yes
   register: install_packages
   until: install_packages|success