ara_api role: add support for installing from fedora packages

This patch is self tested by the addition of a new job that exercises
the role with the packages but it does not test the current source yet.

In order to test the current source, we'll need to set up a job that
builds a package from the current source and then configure the job to
install from these built packages.

Change-Id: Ic326a5243b55b415cd31b8a5702fe92d5dfe0651

roles/ara_api/defaults/main.yaml

@@ -32,6 +32,7 @@ ara_api_venv_path: "{{ ara_api_root_dir }}/virtualenv"
 
 # How ARA will be installed
 # - source [default]: installs from a local or remote git repository
+# - distribution: installs from distribution packages, if available
 # - pypi [planned]: installs from pypi
 ara_api_install_method: source
 

roles/ara_api/tasks/install/distribution.yaml

@@ -0,0 +1,29 @@
+---
+#  Copyright (c) 2019 Red Hat, Inc.
+#
+#  This file is part of ARA Records Ansible.
+#
+#  ARA Records Ansible is free software: you can redistribute it and/or modify
+#  it under the terms of the GNU General Public License as published by
+#  the Free Software Foundation, either version 3 of the License, or
+#  (at your option) any later version.
+#
+#  ARA Records Ansible is distributed in the hope that it will be useful,
+#  but WITHOUT ANY WARRANTY; without even the implied warranty of
+#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+#  GNU General Public License for more details.
+#
+#  You should have received a copy of the GNU General Public License
+#  along with ARA Records Ansible. If not, see <http://www.gnu.org/licenses/>.
+
+- name: Validate if the distribution is supported
+  fail:
+    msg: |
+      {{ ansible_distribution }} does not support installation from distribution packages yet.
+  when: ara_distribution_packages | length == 0
+
+- name: Install ara from distribution packages
+  become: yes
+  package:
+    name: "{{ ara_distribution_packages }}"
+    state: present

roles/ara_api/vars/Fedora.yaml

@@ -16,6 +16,10 @@
 #  You should have received a copy of the GNU General Public License
 #  along with ARA Records Ansible. If not, see <http://www.gnu.org/licenses/>.
 
+ara_distribution_packages:
+  - ara
+  - ara-server
+
 ara_api_required_packages:
   - git
   - python3-virtualenv

roles/ara_api/vars/Ubuntu.yaml

@@ -16,6 +16,9 @@
 #  You should have received a copy of the GNU General Public License
 #  along with ARA Records Ansible. If not, see <http://www.gnu.org/licenses/>.
 
+# ARA has not been packaged for Ubuntu yet
+ara_distribution_packages: []
+
 ara_api_required_packages:
   - git
   - python3-venv