support merge_type`json` (#83)

Fixes #54

molecule/default/converge.yml

@@ -133,6 +133,14 @@
       tags:
         - always
 
+    - name: Include merge_type.yml
+      include_tasks:
+        file: tasks/merge_type.yml
+        apply:
+          tags: [ merge_type, k8s ]
+      tags:
+        - always
+
   roles:
     - role: helm
       tags:

molecule/default/tasks/merge_type.yml

@@ -0,0 +1,252 @@
+- block:
+  - name: Define common facts
+    set_fact:
+      k8s_patch_namespace: "patch"
+      k8s_strategic_merge: "strategic-merge"
+      k8s_merge: "json-merge"
+      k8s_json: "json-patch"
+
+  - name: Ensure the namespace exist
+    kubernetes.core.k8s:
+      kind: namespace
+      name: "{{ k8s_patch_namespace }}"
+
+
+  # Strategic merge
+  - name: create a simple nginx deployment
+    kubernetes.core.k8s:
+      namespace: "{{ k8s_patch_namespace }}"
+      definition:
+        apiVersion: apps/v1
+        kind: Deployment
+        metadata:
+          name: "{{ k8s_strategic_merge }}"
+        spec:
+          replicas: 2
+          selector:
+            matchLabels:
+              app: nginx
+          template:
+            metadata:
+              labels:
+                app: nginx
+            spec:
+              containers:
+              - name: "{{ k8s_strategic_merge }}-ctr"
+                image: nginx
+              tolerations:
+              - effect: NoSchedule
+                key: dedicated
+                value: "test-strategic-merge"
+
+
+  - name: patch service using strategic merge
+    kubernetes.core.k8s:
+      kind: Deployment
+      namespace: "{{ k8s_patch_namespace }}"
+      name: "{{ k8s_strategic_merge }}"
+      definition:
+        spec:
+          template:
+            spec:
+              containers:
+              - name: "{{ k8s_strategic_merge }}-ctr-2"
+                image: redis
+    register: depl_patch
+
+  - name: validate that resource was patched
+    assert:
+      that:
+      - depl_patch.changed
+
+  - name: describe "{{ k8s_strategic_merge }}" deployment
+    kubernetes.core.k8s_info:
+      kind: Deployment
+      name: "{{ k8s_strategic_merge }}"
+      namespace: "{{ k8s_patch_namespace }}"
+    register: deployment_out
+
+  - name: assert that deployment contains expected images
+    assert:
+      that:
+      - deployment_out.resources[0].spec.template.spec.containers | selectattr('image','equalto','nginx') | list | length == 1
+      - deployment_out.resources[0].spec.template.spec.containers | selectattr('image','equalto','redis') | list | length == 1
+
+  # Json merge
+  - name: create a simple nginx deployment (testing merge patch)
+    kubernetes.core.k8s:
+      namespace: "{{ k8s_patch_namespace }}"
+      definition:
+        apiVersion: apps/v1
+        kind: Deployment
+        metadata:
+          name: "{{ k8s_merge }}"
+        spec:
+          replicas: 2
+          selector:
+            matchLabels:
+              app: nginx
+          template:
+            metadata:
+              labels:
+                app: nginx
+            spec:
+              containers:
+              - name: "{{ k8s_merge }}-ctr"
+                image: nginx
+              tolerations:
+              - effect: NoSchedule
+                key: dedicated
+                value: "test-strategic-merge"
+
+
+  - name: patch service using json merge patch
+    kubernetes.core.k8s:
+      kind: Deployment
+      namespace: "{{ k8s_patch_namespace }}"
+      name: "{{ k8s_merge }}"
+      merge_type:
+      - merge
+      definition:
+        spec:
+          template:
+            spec:
+              containers:
+              - name: "{{ k8s_merge }}-ctr-2"
+                image: python
+    register: merge_patch
+
+  - name: validate that resource was patched
+    assert:
+      that:
+      - merge_patch.changed
+
+  - name: describe "{{ k8s_merge }}" deployment
+    kubernetes.core.k8s_info:
+      kind: Deployment
+      name: "{{ k8s_merge }}"
+      namespace: "{{ k8s_patch_namespace }}"
+    register: merge_out
+
+  - name: assert that deployment contains expected images
+    assert:
+      that:
+      - merge_out.resources[0].spec.template.spec.containers | list | length == 1
+      - merge_out.resources[0].spec.template.spec.containers[0].image == 'python'
+
+  # Json
+  - name: create simple pod
+    kubernetes.core.k8s:
+      namespace: "{{ k8s_patch_namespace }}"
+      definition:
+        apiVersion: v1
+        kind: Pod
+        metadata:
+          name: "{{ k8s_json }}-pod"
+          labels:
+            name: "{{ k8s_json }}-pod"
+        spec:
+          containers:
+          - args:
+            - /bin/sh
+            - -c
+            - while true; do echo $(date); sleep 10; done
+            image: python:3.7-alpine
+            imagePullPolicy: Always
+            name: alpine
+
+  - name: Patch pod - update container image
+    kubernetes.core.k8s:
+      kind: Pod
+      namespace: "{{ k8s_patch_namespace }}"
+      name: "{{ k8s_json }}-pod"
+      merge_type:
+      - json
+      definition:
+      - op: replace
+        path: /spec/containers/0/image
+        value: python:3.8-alpine
+    register: pod_patch
+
+  - name: assert that patch was performed
+    assert:
+      that:
+      - pod_patch.changed
+
+  - name: describe Pod after patching
+    kubernetes.core.k8s_info:
+      kind: Pod
+      name: "{{ k8s_json }}-pod"
+      namespace: "{{ k8s_patch_namespace }}"
+    register: describe_pod
+
+  - name: assert that image name has changed
+    assert:
+      that:
+      - describe_pod.resources[0].spec.containers[0].image == 'python:3.8-alpine'
+
+  - name: create a simple nginx deployment
+    kubernetes.core.k8s:
+      namespace: "{{ k8s_patch_namespace }}"
+      definition:
+        apiVersion: apps/v1
+        kind: Deployment
+        metadata:
+          name: "{{ k8s_json }}-depl"
+          labels:
+            name: "{{ k8s_json }}-depl"
+        spec:
+          replicas: 2
+          selector:
+            matchLabels:
+              app: nginx
+          template:
+            metadata:
+              labels:
+                app: nginx
+            spec:
+              containers:
+              - name: nginx-container
+                image: nginx
+                args:
+                - /bin/sh
+                - -c
+                - while true; do echo $(date); sleep 10; done
+
+  - name: Patch Nginx deployment command
+    kubernetes.core.k8s:
+      kind: Deployment
+      namespace: "{{ k8s_patch_namespace }}"
+      name: "{{ k8s_json }}-depl"
+      merge_type:
+      - json
+      definition:
+      - op: add
+        path: '/spec/template/spec/containers/0/args/-'
+        value: 'touch /var/log'
+    register: patch_out
+
+  - name: assert that patch succeed
+    assert:
+      that:
+      - patch_out.changed
+
+  - name: describe deployment after patching
+    kubernetes.core.k8s_info:
+      kind: Deployment
+      name: "{{ k8s_json }}-depl"
+      namespace: "{{ k8s_patch_namespace }}"
+    register: describe_depl
+
+  - name: assert that args changed on deployment
+    assert:
+      that:
+      - describe_depl.resources[0].spec.template.spec.containers[0].args | length == 4
+
+  always:
+  - name: Ensure namespace has been deleted
+    kubernetes.core.k8s:
+      kind: namespace
+      name: "{{ k8s_patch_namespace }}"
+      state: absent
+    ignore_errors: yes