add support for check_mode for modules k8s_scale and k8s_rollback (#255)

k8s_scale, k8s_rollback - add support for check_mode 

SUMMARY

closes #243 and #244

ISSUE TYPE


Bugfix Pull Request

COMPONENT NAME

k8s_scale
k8s_rollback
ADDITIONAL INFORMATION

Reviewed-by: Alina Buzachis <None>
Reviewed-by: None <None>
Reviewed-by: Mike Graves <mgraves@redhat.com>

molecule/default/tasks/rollback.yml

@@ -8,18 +8,12 @@
       k8s:
         name: "{{ namespace }}"
         kind: Namespace
-        api_version: v1
-        apply: no
-      register: output
-
-    - name: show output
-      debug:
-        var: output
 
     - name: Create a deployment
       k8s:
         state: present
         wait: yes
+        wait_timeout: 30
         inline: &deploy
           apiVersion: apps/v1
           kind: Deployment
@@ -43,11 +37,7 @@
                     image: nginx:1.17
                     ports:
                       - containerPort: 80
-      register: output
 
-    - name: Show output
-      debug:
-        var: output
 
     - name: Crash the existing deployment
       k8s:
@@ -77,7 +67,47 @@
                     ports:
                       - containerPort: 80
       ignore_errors: yes
-      register: output
+      register: crash
+
+    - name: Assert that the Deployment failed
+      assert:
+        that:
+          - crash is failed
+
+    - name: Read the deployment
+      k8s_info:
+        kind: Deployment
+        name: nginx-deploy
+        namespace: "{{ namespace }}"
+      register: deployment
+
+    - set_fact:
+        failed_version: "{{ deployment.resources[0].metadata.annotations['deployment.kubernetes.io/revision'] }}"
+
+    - name: Rolling Back the crashed deployment (check mode)
+      k8s_rollback:
+        api_version: apps/v1
+        kind: Deployment
+        name: nginx-deploy
+        namespace: "{{ namespace }}"
+      register: result
+      check_mode: yes
+
+    - assert:
+        that:
+          - result is changed
+
+    - name: Read the deployment
+      k8s_info:
+        kind: Deployment
+        name: nginx-deploy
+        namespace: "{{ namespace }}"
+      register: deployment
+
+    - name: Validate that Rollback using check_mode did not changed the Deployment
+      assert:
+        that:
+          - failed_version == deployment.resources[0].metadata.annotations['deployment.kubernetes.io/revision']
 
     - name: Rolling Back the crashed deployment
       k8s_rollback:
@@ -85,12 +115,24 @@
         kind: Deployment
         name: nginx-deploy
         namespace: "{{ namespace }}"
-      when: output.failed
-      register: output
+      register: result
 
-    - name: Show output
-      debug:
-        var: output
+    - name: assert rollback is changed
+      assert:
+        that:
+          - result is changed
+
+    - name: Read the deployment once again
+      k8s_info:
+        kind: Deployment
+        name: nginx-deploy
+        namespace: "{{ namespace }}"
+      register: deployment
+
+    - name: Validate that Rollback changed the Deployment
+      assert:
+        that:
+          - failed_version | int + 1 == deployment.resources[0].metadata.annotations['deployment.kubernetes.io/revision'] | int
 
     - name: Create a DaemonSet
       k8s:
@@ -139,16 +181,12 @@
                   - name: varlibdockercontainers
                     hostPath:
                       path: /var/lib/docker/containers
-      register: output
-
-    - name: Show output
-      debug:
-        var: output
 
     - name: Crash the existing DaemonSet
       k8s:
         state: present
         wait: yes
+        wait_timeout: 30
         definition:
           apiVersion: apps/v1
           kind: DaemonSet
@@ -192,8 +230,44 @@
                   - name: varlibdockercontainers
                     hostPath:
                       path: /var/lib/docker/containers
-      ignore_errors: yes
-      register: output
+      register: crash
+      ignore_errors: true
+
+    - name: Assert that the Daemonset failed
+      assert:
+        that:
+          - crash is failed
+
+    - name: Read the crashed DaemonSet
+      k8s_info:
+        kind: DaemonSet
+        name: fluentd-elasticsearch
+        namespace: "{{ namespace }}"
+      register: result
+
+    - set_fact:
+        failed_version: "{{ result.resources[0].metadata.annotations['deprecated.daemonset.template.generation'] }}"
+
+    - name: Rolling Back the crashed DaemonSet (check_mode)
+      k8s_rollback:
+        api_version: apps/v1
+        kind: DaemonSet
+        name: fluentd-elasticsearch
+        namespace: "{{ namespace }}"
+      register: result
+      check_mode: yes
+
+    - name: Read the DaemonSet
+      k8s_info:
+        kind: DaemonSet
+        name: fluentd-elasticsearch
+        namespace: "{{ namespace }}"
+      register: result
+
+    - name: Validate that Rollback using check_mode did not changed the DaemonSet version
+      assert:
+        that:
+          - failed_version == result.resources[0].metadata.annotations['deprecated.daemonset.template.generation']
 
     - name: Rolling Back the crashed DaemonSet
       k8s_rollback:
@@ -201,12 +275,24 @@
         kind: DaemonSet
         name: fluentd-elasticsearch
         namespace: "{{ namespace }}"
-      when: output.failed
-      register: output
+      register: result
 
-    - name: Show output
-      debug:
-        var: output
+    - name: assert rollback is changed
+      assert:
+        that:
+          - result is changed
+
+    - name: Read the DaemonSet
+      k8s_info:
+        kind: DaemonSet
+        name: fluentd-elasticsearch
+        namespace: "{{ namespace }}"
+      register: result
+
+    - name: Validate that Rollback changed the Daemonset version
+      assert:
+        that:
+          - failed_version | int + 1 == result.resources[0].metadata.annotations['deprecated.daemonset.template.generation'] | int
 
   always:
     - name: Delete {{ namespace }} namespace