MNAIO: Make post-install storage provisioning idempotent

The swift and cinder hosts do not use containers for services,
so there is no need to do the current process of shrinking the
volumes. Instead, we ensure that the lxc & machines mounts are
removed, with their respective logical volumes.

When setting up the swift logical volumes, we do not need to
create the mount point directories, because the mount task will
do that for us. As such, we remove that task.

Change-Id: Ibbe6d0fede6b6965415e421161354e311708d113

multi-node-aio/playbooks/deploy-vms.yml

@@ -288,53 +288,41 @@
 
 - name: Make space for swift and cinder volumes
   hosts: cinder_hosts:swift_hosts
-  gather_facts: false
+  gather_facts: "{{ gather_facts | default(true) }}"
   environment: "{{ deployment_environment_variables | default({}) }}"
   tags:
     - deploy-vms
   tasks:
-    - name: Unmount lxc and machines mounts
+    - name: Unmount unnecessary mounts
       mount:
         name: "{{ item }}"
-        state: unmounted
+        state: absent
       with_items:
         - "/var/lib/lxc"
         - "/var/lib/machines"
+      register: _remove_mounts
 
-    - name: Remove lxc mount directory
-      mount:
-        name: "/var/lib/lxc"
-        state: absent
-
-    - name: Shrink machines00 logical volume
+    - name: Remove unnecessary logical volumes
       lvol:
         vg: vmvg00
-        lv: machines00
-        size: 8192
-        shrink: yes
-        force: yes
-      when:
-        - default_container_tech | default('lxc') == 'nspawn'
-
-    - name: Remove lxc00 logical volume
-      lvol:
-        vg: vmvg00
-        lv: lxc00
+        lv: "{{ item }}"
         force: true
         state: absent
+      with_items:
+        - "lxc00"
+        - "machines00"
+      register: _remove_lvs
 
-    - name: Re-mount machines00 logical volume
-      mount:
-        path: /var/lib/machines
-        src: /dev/mapper/vmvg00-machines00
-        state: mounted
-        fstype: btrfs
-        opts: defaults,discard
+    - name: Reload systemd to remove generated unit files for mount
+      systemd:
+        daemon_reload: yes
+      when:
+        - (_remove_mounts is changed) or (_remove_lvs is changed)
 
 
 - name: Setup cinder host volume
   hosts: cinder_hosts
-  gather_facts: false
+  gather_facts: "{{ gather_facts | default(true) }}"
   environment: "{{ deployment_environment_variables | default({}) }}"
   tags:
     - deploy-vms
@@ -354,12 +342,12 @@
 
 - name: Setup swift host volume
   hosts: swift_hosts
-  gather_facts: false
+  gather_facts: "{{ gather_facts | default(true) }}"
   environment: "{{ deployment_environment_variables | default({}) }}"
   tags:
     - deploy-vms
   tasks:
-    - name: Remove deleteme lv
+    - name: Create swift disk LV's
       lvol:
         vg: vmvg00
         lv: "{{ item }}"
@@ -378,18 +366,6 @@
         - disk2
         - disk3
 
-    - name: Create drive directories
-      file:
-        path: "/srv/{{ item }}"
-        state: directory
-        owner: "root"
-        group: "root"
-        mode: "0755"
-      with_items:
-        - disk1
-        - disk2
-        - disk3
-
     - name: Mount swift drives
       mount:
         name: "/srv/{{ item }}"