add reuse_values and reset_values support to helm module (#575)

helm - add reuse_values and reset_values support

SUMMARY

closes #394

ISSUE TYPE


Feature Pull Request

COMPONENT NAME

helm
ADDITIONAL INFORMATION

Reviewed-by: Mike Graves <mgraves@redhat.com>

changelogs/fragments/575-helm-add-support-for-reuse_values-and-reset_values.yml

@@ -0,0 +1,3 @@
+---
+minor_changes:
+  - helm - add reuse_values and reset_values support to helm module (https://github.com/ansible-collections/kubernetes.core/issues/394).

plugins/modules/helm.py

@@ -130,6 +130,21 @@ options:
           - json
           - file
     version_added: '2.4.0'
+  reuse_values:
+    description:
+      - When upgrading package, specifies wether to reuse the last release's values and merge in any overrides from parameters I(release_values),
+        I(values_files) or I(set_values).
+      - If I(reset_values) is set to C(True), this is ignored.
+    type: bool
+    required: false
+    version_added: '2.5.0'
+  reset_values:
+    description:
+      - When upgrading package, reset the values to the ones built into the chart.
+    type: bool
+    required: false
+    default: True
+    version_added: '2.5.0'
 
 #Helm options
   disable_hook:
@@ -310,6 +325,17 @@ EXAMPLES = r"""
         enabled: True
       logging:
         enabled: True
+
+# Deploy latest version
+- name: Deploy latest version of Grafana chart using reuse_values
+  kubernetes.core.helm:
+    name: test
+    chart_ref: stable/grafana
+    release_namespace: monitoring
+    reuse_values: true
+    values:
+      replicas: 2
+      version: 3e8ec0b2dffa40fb97d5342e4af887de95faa8c61a62480dd7f8aa03dffcf533
 """
 
 RETURN = r"""
@@ -474,6 +500,8 @@ def deploy(
     timeout=None,
     dependency_update=None,
     set_value_args=None,
+    reuse_values=None,
+    reset_values=True,
 ):
     """
     Install/upgrade/rollback release chart
@@ -485,9 +513,11 @@ def deploy(
             deploy_command += " --dependency-update"
     else:
         deploy_command = command + " upgrade -i"  # install/upgrade
+        if reset_values:
+            deploy_command += " --reset-values"
 
-        # Always reset values to keep release_values equal to values released
-        deploy_command += " --reset-values"
+    if reuse_values is not None:
+        deploy_command += " --reuse-values=" + str(reuse_values)
 
     if wait:
         deploy_command += " --wait"
@@ -684,6 +714,8 @@ def argument_spec():
             skip_crds=dict(type="bool", default=False),
             history_max=dict(type="int"),
             set_values=dict(type="list", elements="dict"),
+            reuse_values=dict(type="bool"),
+            reset_values=dict(type="bool", default=True),
         )
     )
     return arg_spec
@@ -734,6 +766,8 @@ def main():
     history_max = module.params.get("history_max")
     timeout = module.params.get("timeout")
     set_values = module.params.get("set_values")
+    reuse_values = module.params.get("reuse_values")
+    reset_values = module.params.get("reset_values")
 
     if update_repo_cache:
         run_repo_update(module)
@@ -826,6 +860,8 @@ def main():
                 history_max=history_max,
                 timeout=timeout,
                 set_value_args=set_value_args,
+                reuse_values=reuse_values,
+                reset_values=reset_values,
             )
             changed = True
 
@@ -885,6 +921,8 @@ def main():
                     timeout=timeout,
                     dependency_update=dependency_update,
                     set_value_args=set_value_args,
+                    reuse_values=reuse_values,
+                    reset_values=reset_values,
                 )
                 changed = True
 

tests/integration/targets/helm/defaults/main.yml

@@ -24,3 +24,4 @@ test_namespace:
   - "helm-local-path-003"
   - "helm-from-repository"
   - "helm-from-url"
+  - "helm-reuse-values"

tests/integration/targets/helm/tasks/run_test.yml

@@ -25,6 +25,9 @@
     - from_repository
     - from_url
 
+- name: test helm upgrade with reuse_values
+  include_tasks: test_helm_reuse_values.yml
+
 - name: test helm dependency update
   include_tasks: test_up_dep.yml
 

tests/integration/targets/helm/tasks/test_helm_reuse_values.yml

@@ -0,0 +1,75 @@
+---
+- name: Test helm reuse_values
+  vars:
+    helm_namespace: "{{ test_namespace[9] }}"
+    chart_release_values:
+      replica:
+        replicaCount: 3
+      master:
+        count: 1
+        kind: Deployment
+    chart_reuse_values:
+      replica:
+        replicaCount: 1
+      master:
+        count: 3
+  block:
+    - name: Initial chart installation
+      helm:
+        binary_path: "{{ helm_binary }}"
+        chart_ref: redis
+        chart_repo_url: https://charts.bitnami.com/bitnami
+        release_name: test-redis
+        release_namespace: "{{ helm_namespace }}"
+        create_namespace: true
+        release_values: "{{ chart_release_values }}"
+      register: install
+
+    - name: Get value set as string
+      helm_info:
+        binary_path: "{{ helm_binary }}"
+        release_name: test-redis
+        release_namespace: "{{ helm_namespace }}"
+      register: release_value
+
+    - name: Validate that chart values are as expected
+      assert:
+        that:
+          - install is changed
+          - '"--reuse-values=True" not in install.command'
+          - release_value["status"]["values"] == chart_release_values
+
+    - name: Upgrade chart using reuse_values=true
+      helm:
+        binary_path: "{{ helm_binary }}"
+        chart_ref: redis
+        chart_repo_url: https://charts.bitnami.com/bitnami
+        release_name: test-redis
+        release_namespace: "{{ helm_namespace }}"
+        reuse_values: true
+        reset_values: false
+        release_values: "{{ chart_reuse_values }}"
+      register: upgrade
+
+    - name: Get value set as string
+      helm_info:
+        binary_path: "{{ helm_binary }}"
+        release_name: test-redis
+        release_namespace: "{{ helm_namespace }}"
+      register: release_value
+
+    - name: Validate that chart values are as expected
+      assert:
+        that:
+          - upgrade is changed
+          - '"--reuse-values=True" in upgrade.command'
+          - '"--reset-values" not in upgrade.command'
+          - release_value["status"]["values"] == chart_release_values | combine(chart_reuse_values, recursive=true)
+
+  always:
+    - name: Remove helm namespace
+      k8s:
+        api_version: v1
+        kind: Namespace
+        name: "{{ helm_namespace }}"
+        state: absent