k8s: add support for template (#230)

Fixes: #37

Signed-off-by: Abhijeet Kasurde <akasurde@redhat.com>

molecule/default/converge.yml

@@ -28,6 +28,7 @@
     - include_tasks: tasks/exec.yml
     - include_tasks: tasks/log.yml
     - include_tasks: tasks/info.yml
+    - include_tasks: tasks/template.yml
 
   roles:
     - helm

molecule/default/tasks/template.yml

@@ -0,0 +1,155 @@
+---
+- block:
+    - set_fact:
+        template_namespace: template-test
+
+    - name: Ensure namespace exists
+      k8s:
+        definition:
+          apiVersion: v1
+          kind: Namespace
+          metadata:
+            name: "{{ template_namespace }}"
+
+    - name: Check if k8s_service does not inherit parameter
+      community.kubernetes.k8s_service:
+        template: "pod_template_one.j2"
+        state: present
+      ignore_errors: yes
+      register: r
+
+    - name: Check for expected failures in last tasks
+      assert:
+        that:
+          - r.failed
+          - "'is only supported parameter for' in r.msg"
+
+    - name: Specify both definition and template
+      community.kubernetes.k8s:
+        state: present
+        template: "pod_template_one.j2"
+        definition:
+          apiVersion: apps/v1
+          kind: Deployment
+          metadata:
+            name: apply-deploy
+            namespace: "{{ template_namespace }}"
+          spec:
+            replicas: 1
+            selector:
+              matchLabels:
+                app: "{{ k8s_pod_name }}"
+      vars:
+        k8s_pod_name: pod
+        k8s_pod_namespace: "{{ template_namespace }}"
+      register: r
+      ignore_errors: yes
+
+    - name: Check if definition and template are mutually exclusive
+      assert:
+        that:
+          - r.failed
+          - "'parameters are mutually exclusive' in r.msg"
+
+    - name: Specify both src and template
+      community.kubernetes.k8s:
+        state: present
+        src: "../templates/pod_template_one.j2"
+        template: "pod_template_one.j2"
+      vars:
+        k8s_pod_name: pod
+        k8s_pod_namespace: "{{ template_namespace }}"
+      register: r
+      ignore_errors: yes
+
+    - name: Check if src and template are mutually exclusive
+      assert:
+        that:
+          - r.failed
+          - "'parameters are mutually exclusive' in r.msg"
+
+    - name: Create pod using template (direct specification)
+      community.kubernetes.k8s:
+        template: "pod_template_one.j2"
+        wait: yes
+      vars:
+        k8s_pod_name: pod-1
+        k8s_pod_namespace: "{{ template_namespace }}"
+      register: r
+
+    - name: Assert that pod creation succeeded using template
+      assert:
+        that:
+          - r is successful
+
+    - name: Create pod using template with wrong parameter
+      community.kubernetes.k8s:
+        template:
+          - default
+        wait: yes
+      vars:
+        k8s_pod_name: pod-2
+        k8s_pod_namespace: "{{ template_namespace }}"
+      register: r
+      ignore_errors: True
+
+    - name: Assert that pod creation failed using template due to wrong parameter
+      assert:
+        that:
+          - r is failed
+          - "'Error while reading template file' in r.msg"
+
+    - name: Create pod using template (path parameter)
+      community.kubernetes.k8s:
+        template:
+          path: "pod_template_one.j2"
+        wait: yes
+      vars:
+        k8s_pod_name: pod-3
+        k8s_pod_namespace: "{{ template_namespace }}"
+      register: r
+
+    - name: Assert that pod creation succeeded using template
+      assert:
+        that:
+          - r is successful
+
+    - name: Create pod using template (different variable string)
+      community.kubernetes.k8s:
+        template:
+          path: "pod_template_two.j2"
+          variable_start_string: '[['
+          variable_end_string: ']]'
+        wait: yes
+      vars:
+        k8s_pod_name: pod-4
+        k8s_pod_namespace: "[[ template_namespace ]]"
+        ansible_python_interpreter: "[[ ansible_playbook_python ]]"
+      register: r
+
+    - name: Assert that pod creation succeeded using template
+      assert:
+        that:
+          - r is successful
+
+    - name: Remove Pod (Cleanup)
+      k8s:
+        api_version: v1
+        kind: Pod
+        name: "{{ item }}"
+        namespace: "{{ template_namespace }}"
+        state: absent
+        wait: yes
+      ignore_errors: yes
+      with_items:
+        - pod-1
+        - pod-2
+        - pod-3
+        - pod-4
+
+  always:
+    - name: Remove namespace (Cleanup)
+      k8s:
+        kind: Namespace
+        name: "{{ template_namespace }}"
+        state: absent

molecule/default/templates/pod_template_one.j2

@@ -0,0 +1,16 @@
+apiVersion: v1
+kind: Pod
+metadata:
+  labels:
+    app: "{{ k8s_pod_name }}"
+  name: '{{ k8s_pod_name }}'
+  namespace: '{{ k8s_pod_namespace }}'
+spec:
+  containers:
+  - args:
+    - /bin/sh
+    - -c
+    - while true; do echo $(date); sleep 10; done
+    image: python:3.7-alpine
+    imagePullPolicy: Always
+    name: '{{ k8s_pod_name }}'

molecule/default/templates/pod_template_two.j2

@@ -0,0 +1,16 @@
+apiVersion: v1
+kind: Pod
+metadata:
+  labels:
+    app: '[[ k8s_pod_name ]]'
+  name: '[[ k8s_pod_name ]]'
+  namespace: '[[ k8s_pod_namespace ]]'
+spec:
+  containers:
+  - args:
+    - /bin/sh
+    - -c
+    - while true; do echo $(date); sleep 10; done
+    image: python:3.7-alpine
+    imagePullPolicy: Always
+    name: '[[ k8s_pod_name ]]'