helm - Add reuse-values when running helm diff

changelogs/fragments/20240228-fix-helm-diff-with-reuse-values.yml

@@ -0,0 +1,3 @@
+---
+bugfixes:
+  - helm - use ``reuse-values`` when running ``helm diff`` command (https://github.com/ansible-collections/kubernetes.core/issues/680).

plugins/modules/helm.py

@@ -640,6 +640,8 @@ def helmdiff_check(
     chart_repo_url=None,
     post_renderer=False,
     set_value_args=None,
+    reuse_values=None,
+    reset_values=True,
 ):
     """
     Use helm diff to determine if a release would change by upgrading a chart.
@@ -653,7 +655,7 @@ def helmdiff_check(
     if chart_version is not None:
         cmd += " " + "--version=" + chart_version
     if not replace:
-        cmd += " " + "--reset-values"
+        cmd += " " + "--reset-values=" + str(reset_values)
     if post_renderer:
         cmd += " --post-renderer=" + post_renderer
 
@@ -671,6 +673,9 @@ def helmdiff_check(
     if set_value_args:
         cmd += " " + set_value_args
 
+    if reuse_values:
+        cmd += " --reuse-values"
+
     rc, out, err = module.run_helm_command(cmd)
     return (len(out.strip()) > 0, out.strip())
 
@@ -901,6 +906,8 @@ def main():
                     chart_repo_url,
                     post_renderer,
                     set_value_args,
+                    reuse_values=reuse_values,
+                    reset_values=reset_values,
                 )
                 if would_change and module._diff:
                     opt_result["diff"] = {"prepared": prepared}

tests/integration/targets/helm_diff/files/test-chart-reuse-values/Chart.yaml

@@ -0,0 +1,24 @@
+apiVersion: v2
+name: chart-reuse-values
+description: A Helm chart for Kubernetes
+
+# A chart can be either an 'application' or a 'library' chart.
+#
+# Application charts are a collection of templates that can be packaged into versioned archives
+# to be deployed.
+#
+# Library charts provide useful utilities or functions for the chart developer. They're included as
+# a dependency of application charts to inject those utilities and functions into the rendering
+# pipeline. Library charts do not define any templates and therefore cannot be deployed.
+type: application
+
+# This is the chart version. This version number should be incremented each time you make changes
+# to the chart and its templates, including the app version.
+# Versions are expected to follow Semantic Versioning (https://semver.org/)
+version: 0.1.0
+
+# This is the version number of the application being deployed. This version number should be
+# incremented each time you make changes to the application. Versions are not expected to
+# follow Semantic Versioning. They should reflect the version the application is using.
+# It is recommended to use it with quotes.
+appVersion: "1.16.0"

tests/integration/targets/helm_diff/files/test-chart-reuse-values/templates/configmap.yaml

@@ -0,0 +1,7 @@
+apiVersion: v1
+kind: ConfigMap
+metadata:
+  name: cmap
+data:
+  ansible_version: {{ .Values.ansible_version }}
+  python_version: {{ .Values.python_version }}

tests/integration/targets/helm_diff/files/test-chart-reuse-values/values.yaml

@@ -0,0 +1,2 @@
+ansible_version: 2.16
+python_version: 3.9

tests/integration/targets/helm_diff/tasks/main.yml

@@ -299,3 +299,5 @@
         name: "{{ helm_namespace }}"
         state: absent
       ignore_errors: yes
+
+- include_tasks: reuse_values.yml

tests/integration/targets/helm_diff/tasks/reuse_values.yml

@@ -0,0 +1,78 @@
+---
+- name: Create temporary directory for helm chart
+  tempfile:
+    suffix: .helm
+    state: directory
+  register: helm_dir
+
+- name: Test helm diff functionality
+  vars:
+    test_chart_path: "{{ helm_dir.path }}/chart"
+    helm_namespace: "helm-reuse-values-001"
+    test_release_name: "myrelease"
+
+  block:
+
+    - name: Install helm diff
+      helm_plugin:
+        binary_path: "{{ helm_binary }}"
+        state: present
+        plugin_path: https://github.com/databus23/helm-diff
+        plugin_version: 3.9.4
+
+    - name: Copy test chart
+      copy:
+        src: "test-chart-reuse-values"
+        dest: "{{ test_chart_path }}"
+
+    - name: Create helm release
+      kubernetes.core.helm:
+        state: present
+        binary_path: "{{ helm_binary }}"
+        chart_ref: "{{ test_chart_path }}"
+        release_name: "{{ test_release_name }}"
+        release_namespace: "{{ helm_namespace }}"
+        create_namespace: true
+        release_values:
+          ansible_version: devel
+          python_version: 3.11
+        wait: true
+
+    - name: Upgrade helm release
+      kubernetes.core.helm:
+        binary_path: "{{ helm_binary }}"
+        chart_ref: "{{ test_chart_path }}"
+        reset_values: false
+        reuse_values: true
+        release_name: "{{ test_release_name }}"
+        release_namespace: "{{ helm_namespace }}"
+        values:
+          ansible_version: devel
+      register: helm_upgrade
+
+    - name: Ensure task did not reported change
+      assert:
+        that:
+          - helm_upgrade is not changed
+
+  always:
+    - name: Remove temporary directory
+      file:
+        path: "{{ helm_dir.path }}"
+        state: absent
+      ignore_errors: true
+
+    - name: Uninstall helm diff
+      helm_plugin:
+        binary_path: "{{ helm_binary }}"
+        state: absent
+        plugin_name: diff
+      ignore_errors: true
+
+    - name: Remove helm namespace
+      k8s:
+        api_version: v1
+        kind: Namespace
+        name: "{{ helm_namespace }}"
+        state: absent
+      ignore_errors: true