Allow deployers to define the container type

The variable `lxc_user_defined_container` has been added which allows a
deployer to define the container variable file in use for a given
container type.

Depends-On: https://review.openstack.org/554383
Change-Id: Ia1373bfa916b4add49a8444d2e4553f898650328
Signed-off-by: Kevin Carter <kevin.carter@rackspace.com>

defaults/main.yml

@@ -163,5 +163,14 @@ lxc_container_veth_wiring: false
 # Enable systemd-resolved
 lxc_container_enable_resolved: true
 
+# User defined variable pointing to a specific variable file used when setting
+# up the base container image. Deployers can use the provided container variable
+# files by simply inputting the file name
+# "{{ ansible_distribution }}-{{ ansible_distribution_version }}-container.yml"
+# or by providing the full path to a local file containing all of the variables
+# needed to prepare a container. built-in supported values are:
+#   [redhat-7.yml, suse-42.yml, ubuntu-16.04.yml]
+lxc_user_defined_container: null
+
 # Dictionary of settings for containers
 properties: {}

releasenotes/notes/user-containers-1daed001ee6b88ae.yaml

@@ -0,0 +1,9 @@
+---
+features:
+  - The variable ``lxc_user_defined_container`` has been added to the
+    lxc_container_create role allowing deployers to define the variable
+    file loaded when creating a container. This option defaults to **null**
+    which will instruct the role to create a container using the OS most closely
+    assosiated with the underlying OS. This option can be set to either one of
+    the roles built-in container types or use any variable file local to the
+    deployment host.

tasks/main.yml

@@ -49,6 +49,7 @@
 - name: Gather variables for each operating system
   include_vars: "{{ item }}"
   with_first_found:
+    - "{{ lxc_user_defined_container }}"
     - "{{ hostvars[physical_host]['ansible_distribution'] | lower }}-{{ hostvars[physical_host]['ansible_distribution_version'] | lower }}.yml"
     - "{{ hostvars[physical_host]['ansible_distribution'] | lower }}-{{ hostvars[physical_host]['ansible_distribution_major_version'] | lower }}.yml"
     - "{{ hostvars[physical_host]['ansible_os_family'] | lower }}-{{ hostvars[physical_host]['ansible_distribution_major_version'] | lower }}.yml"

vars/suse-42.yml

@@ -30,7 +30,7 @@ lxc_container_enable_resolved: false
 lxc_container_map:
   distro: opensuse
   arch: amd64
-  release: "{{ hostvars[physical_host]['ansible_distribution_version'] }}"
+  release: "42.3"
 
 ### REMOVE IN "S"
 # The machine-id is not removed in the base container. Remove the machine-id