Provide initial steps for Multi-Distro enablement

The role begins by determining which platform is in use, and system
packages are installed based on that platform using a conditional
include pattern introduced throughout OpenStack-Ansible roles.

defaults/main.yml

@@ -152,16 +152,6 @@ gnocchi_api_program_name: gnocchi-api
 #: Gnocchi Metricd program name
 gnocchi_metricd_program_name: gnocchi-metricd
 
-#: Necessary packages
-gnocchi_apt_packages:
-  - apache2
-  - apache2-utils
-  - libapache2-mod-wsgi
-  - git
-  - build-essential
-  - python-dev
-  - libpq-dev
-
 #: Gnocchi packages that must be installed before anything else
 gnocchi_required_pip_packages:
   - virtualenv

meta/main.yml

@@ -12,7 +12,9 @@ galaxy_info:
   categories:
   - cloud
 dependencies:
-  - apt_package_pinning
+  - role: apt_package_pinning
+    when:
+      - ansible_pkg_mgr == 'apt'
   - pip_lock_down
   - galera_client
   - openstack_openrc

tasks/gnocchi_install.yml

@@ -13,22 +13,11 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-#TODO(evrardjp): Replace the next 2 tasks by a standard apt with cache
-#when https://github.com/ansible/ansible-modules-core/pull/1517 is merged
-#in 1.9.x or we move to 2.0 (if tested working)
-- name: Check apt last update file
-  stat:
-    path: /var/cache/apt
-  register: apt_cache_stat
+- include: gnocchi_install_apt.yml
+  when:
+    - ansible_pkg_mgr == 'apt'
   tags:
-    - gnocchi-apt-packages
-
-- name: Update apt if needed
-  apt:
-    update_cache: yes
-  when: "ansible_date_time.epoch|float - apt_cache_stat.stat.mtime > {{cache_timeout}}"
-  tags:
-    - gnocchi-apt-packages
+    - gnocchi-install
 
 - name: Create developer mode constraint file
   copy:

tasks/gnocchi_install_apt.yml

@@ -0,0 +1,38 @@
+---
+# Copyright 2015, 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.
+
+#TODO(evrardjp): Replace the next 2 tasks by a standard apt with cache
+#when https://github.com/ansible/ansible-modules-core/pull/1517 is merged
+#in 1.9.x or we move to 2.0 (if tested working)
+
+- name: Check apt last update file
+  stat:
+    path: /var/cache/apt
+  register: apt_cache_stat
+
+- name: Update apt if needed
+  apt:
+    update_cache: yes
+  when: "ansible_date_time.epoch|float - apt_cache_stat.stat.mtime > {{cache_timeout}}"
+
+- name: Install apt packages
+  apt:
+    pkg: "{{ item }}"
+    state: latest
+  register: install_packages
+  until: install_packages|success
+  retries: 5
+  delay: 2
+  with_items: gnocchi_apt_packages

tasks/main.yml

@@ -13,6 +13,15 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+- name: Gather variables for each operating system
+  include_vars: "{{ item }}"
+  with_first_found:
+    - "{{ ansible_distribution | lower }}-{{ ansible_distribution_version | lower }}.yml"
+    - "{{ ansible_distribution | lower }}.yml"
+    - "{{ ansible_os_family | lower }}.yml"
+  tags:
+    - always
+
 - include: gnocchi_pre_install.yml
 - include: gnocchi_install.yml
 - include: gnocchi_post_install.yml

vars/ubuntu-14.04.yml

@@ -13,4 +13,12 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-
+#: Necessary packages
+gnocchi_apt_packages:
+  - apache2
+  - apache2-utils
+  - libapache2-mod-wsgi
+  - git
+  - build-essential
+  - python-dev
+  - libpq-dev