Remove per-backend container creation tasks files

The same can be achieved with two ternary operators. Much
less code and duplication.

Default lxc_container_backing_store to 'dir' to match the
lxc_container_create role and further simplify the code.
Change-Id: I59bbbcd8a66970a4fb30339aed457b50fb4dad50

defaults/main.yml

@@ -74,7 +74,7 @@ lxc_container_cache_path: "/var/cache/lxc/download"
 # The container backing store can be set to 'overlayfs' to use overlayfs
 # This should only be done for production use with a linux kernel > 3.14
 # which is when overlayfs was merged into the mainline kernel
-# lxc_container_backing_store: overlayfs
+lxc_container_backing_store: dir
 
 # The container backing method can be set to 'copy-on-write' to use LVM
 # snapshot-backed containers when the container backing store is set to

tasks/lxc_cache_create.yml

@@ -13,10 +13,6 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-- name: Set backingstore fact
-  set_fact:
-    container_backing_store: "{{ lxc_container_backing_store | default('None') }}"
-
 - name: Create LXC cache dir
   file:
     path: "{{ cache_path_fact }}"
@@ -72,8 +68,35 @@
     content: "{{ cache_time }}"
     dest: "{{ cache_path_fact }}/build_id"
 
-- include_tasks: "{{ item }}"
-  with_first_found:
-    - files:
-        - "lxc_container_{{ container_backing_store }}.yml"
-      skip: true
+- name: Create base container to use for {{ lxc_container_backing_store }}-backed containers
+  lxc_container:
+    name: "{{ lxc_container_base_name }}"
+    template: "download"
+    state: stopped
+    backing_store: "{{ (lxc_container_backing_store == 'overlayfs') | ternary('dir', lxc_container_backing_store) }}"
+    zfs_root: "{{ (lxc_container_backing_store == 'zfs') | ternary(lxc_container_zfs_root_name, omit) }}"
+    template_options: "{{ lxc_cache_download_template_options }}"
+  register: cache_download
+  retries: 3
+  delay: 10
+  until: cache_download is success
+
+- name: Set the qgroup limits for btrfs
+  when:
+    - lxc_container_backing_store == 'btrfs'
+  block:
+    - name: Set the qgroup size|compression limits on machines
+      command: "btrfs qgroup limit {{ item }} /var/lib/lxc/{{ lxc_container_base_name }}"
+      changed_when: false
+      with_items:
+        - "-e {{ lxc_host_machine_qgroup_space_limit }}"
+        - "-c {{ lxc_host_machine_qgroup_compression_limit }}"
+      when:
+        - not lxc_host_machine_quota_disabled
+  rescue:
+    - name: Notice regarding quota system
+      debug:
+        msg: >-
+          There was an error processing the setup of qgroups. Check the system
+          to ensure they're available otherwise disable the quota system by
+          setting `lxc_host_machine_quota_disabled` to true.

tasks/lxc_container_btrfs.yml

@@ -1,44 +0,0 @@
----
-# Copyright 2016, 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.
-
-- name: Create base container to use for BTRFS-backed containers
-  lxc_container:
-    name: "{{ lxc_container_base_name }}"
-    template: "download"
-    state: stopped
-    backing_store: "btrfs"
-    template_options: "{{ lxc_cache_download_template_options }}"
-  register: cache_download
-  retries: 3
-  delay: 10
-  until: cache_download is success
-
-- name: Set the qgroup limits
-  block:
-    - name: Set the qgroup size|compression limits on machines
-      command: "btrfs qgroup limit {{ item }} /var/lib/lxc/{{ lxc_container_base_name }}"
-      changed_when: false
-      with_items:
-        - "-e {{ lxc_host_machine_qgroup_space_limit }}"
-        - "-c {{ lxc_host_machine_qgroup_compression_limit }}"
-      when:
-        - not lxc_host_machine_quota_disabled
-  rescue:
-    - name: Notice regarding quota system
-      debug:
-        msg: >-
-          There was an error processing the setup of qgroups. Check the system
-          to ensure they're available otherwise disable the quota system by
-          setting `lxc_host_machine_quota_disabled` to true.

tasks/lxc_container_lvm.yml

@@ -1,29 +0,0 @@
----
-# Copyright 2016, 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.
-
-- name: Create base container to use for LVM-backed copy-on-write containers
-  lxc_container:
-    name: "{{ lxc_container_base_name }}"
-    template: "download"
-    state: stopped
-    backing_store: "lvm"
-    template_options: "{{ lxc_cache_download_template_options }}"
-  register: cache_download
-  retries: 3
-  delay: 10
-  until: cache_download is success
-  when:
-    - lxc_container_backing_method is defined
-    - lxc_container_backing_method == 'copy-on-write'

tasks/lxc_container_overlayfs.yml

@@ -1,26 +0,0 @@
----
-# Copyright 2016, 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.
-
-- name: Create base container to use for overlayfs containers
-  lxc_container:
-    name: "{{ lxc_container_base_name }}"
-    template: "download"
-    state: stopped
-    backing_store: "dir"
-    template_options: "{{ lxc_cache_download_template_options }}"
-  register: cache_download
-  retries: 3
-  delay: 10
-  until: cache_download is success

tasks/lxc_container_zfs.yml

@@ -1,27 +0,0 @@
----
-# Copyright 2016, 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.
-
-- name: Create base container to use for ZFS-backed containers
-  lxc_container:
-    name: "{{ lxc_container_base_name }}"
-    template: "download"
-    state: stopped
-    backing_store: "zfs"
-    zfs_root: "{{ lxc_container_zfs_root_name }}"
-    template_options: "{{ lxc_cache_download_template_options }}"
-  register: cache_download
-  retries: 3
-  delay: 10
-  until: cache_download is success