Merge "Bring idempotency to swapon"

tests/roles/bootstrap-host/tasks/prepare_loopback_swap.yml

@@ -13,7 +13,12 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-- name: Create swap file
+- block:
+    - name: Check if swap is already enabled
+      command: grep /openstack/swap.img /proc/swaps
+
+  rescue:
+    - name: Create swap file
       command: "fallocate -l {{ bootstrap_host_swap_size }}G /openstack/swap.img"
       args:
         creates: /openstack/swap.img
@@ -21,20 +26,20 @@
       tags:
         - swap-file-create
 
-- name: Set swap file permissions to 0600
+    - name: Set swap file permissions to 0600
       file:
         path: /openstack/swap.img
         mode: 0600
       tags:
         - swap-permissions
 
-- name: Format the swap file
+    - name: Format the swap file
       command: mkswap /openstack/swap.img
       when: swap_create | changed
       tags:
         - swap-format
 
-- name: Ensure that the swap file entry is in /etc/fstab
+    - name: Ensure that the swap file entry is in /etc/fstab
       mount:
         name: none
         src: /openstack/swap.img
@@ -46,9 +51,8 @@
       tags:
         - swap-fstab
 
-- name: Bring swap file online
+    - name: Bring swap file online
       command: swapon /openstack/swap.img
-  changed_when: false
       tags:
         - swap-online