add reset_then_reuse_values support to helm module

changelogs/fragments/800-helm-add-reset_then_reuse_values-support.yml

@@ -0,0 +1,3 @@
+---
+minor_changes:
+  - helm - add reset_then_reuse_values support to helm module (https://github.com/ansible-collections/kubernetes.core/issues/803).

docs/kubernetes.core.helm_module.rst

@@ -476,6 +476,27 @@ Parameters
                         <div>If <em>reset_values</em> is set to <code>True</code>, this is ignored.</div>
                 </td>
             </tr>
+            <tr>
+                <td colspan="2">
+                    <div class="ansibleOptionAnchor" id="parameter-"></div>
+                    <b>reset_then_reuse_values</b>
+                    <a class="ansibleOptionLink" href="#parameter-" title="Permalink to this option"></a>
+                    <div style="font-size: small">
+                        <span style="color: purple">boolean</span>
+                    </div>
+                    <div style="font-style: italic; font-size: small; color: darkgreen">added in 5.1.0</div>
+                </td>
+                <td>
+                        <ul style="margin: 0; padding: 0"><b>Choices:</b>
+                                    <li>no</li>
+                                    <li>yes</li>
+                        </ul>
+                </td>
+                <td>
+                        <div>When upgrading package, reset the values to the ones built into the chart, apply the last release&#x27;s values and merge in any overrides from parameters <em>release_values</em>, <em>values_files</em> or <em>set_values</em>.</div>
+                        <div>If <em>reset_values</em> or <em>reuse_values</em> is set to <code>True</code>, this is ignored.</div>
+                </td>
+            </tr>
             <tr>
                 <td colspan="2">
                     <div class="ansibleOptionAnchor" id="parameter-"></div>

plugins/modules/helm.py

@@ -145,6 +145,15 @@
     required: false
     default: True
     version_added: 2.5.0
+  reset_then_reuse_values:
+    description:
+      - When upgrading package, reset the values to the ones built into the chart, apply 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) or I(reuse_values) is set to C(True), this is ignored.
+    type: bool
+    required: false
+    default: False
+    version_added: 5.1.0
 
 #Helm options
   disable_hook:
@@ -509,6 +518,7 @@ def deploy(
     set_value_args=None,
     reuse_values=None,
     reset_values=True,
+    reset_then_reuse_values=False,
 ):
     """
     Install/upgrade/rollback release chart
@@ -526,6 +536,9 @@ def deploy(
     if reuse_values is not None:
         deploy_command += " --reuse-values=" + str(reuse_values)
 
+    if reset_then_reuse_values:
+        deploy_command += " --reset-then-reuse-values"
+
     if wait:
         deploy_command += " --wait"
         if wait_timeout is not None:
@@ -642,6 +655,7 @@ def helmdiff_check(
     set_value_args=None,
     reuse_values=None,
     reset_values=True,
+    reset_then_reuse_values=False,
 ):
     """
     Use helm diff to determine if a release would change by upgrading a chart.
@@ -676,6 +690,9 @@ def helmdiff_check(
     if reuse_values:
         cmd += " --reuse-values"
 
+    if reset_then_reuse_values:
+        cmd += " --reset-then-reuse-values"
+
     rc, out, err = module.run_helm_command(cmd)
     return (len(out.strip()) > 0, out.strip())
 
@@ -735,6 +752,7 @@ def argument_spec():
             set_values=dict(type="list", elements="dict"),
             reuse_values=dict(type="bool"),
             reset_values=dict(type="bool", default=True),
+            reset_then_reuse_values=dict(type="bool", default=False),
         )
     )
     return arg_spec
@@ -787,6 +805,7 @@ def main():
     set_values = module.params.get("set_values")
     reuse_values = module.params.get("reuse_values")
     reset_values = module.params.get("reset_values")
+    reset_then_reuse_values = module.params.get("reset_then_reuse_values")
 
     if update_repo_cache:
         run_repo_update(module)
@@ -883,6 +902,7 @@ def main():
                 set_value_args=set_value_args,
                 reuse_values=reuse_values,
                 reset_values=reset_values,
+                reset_then_reuse_values=reset_then_reuse_values,
             )
             changed = True
 
@@ -908,6 +928,7 @@ def main():
                     set_value_args,
                     reuse_values=reuse_values,
                     reset_values=reset_values,
+                    reset_then_reuse_values=reset_then_reuse_values,
                 )
                 if would_change and module._diff:
                     opt_result["diff"] = {"prepared": prepared}
@@ -943,6 +964,7 @@ def main():
                     set_value_args=set_value_args,
                     reuse_values=reuse_values,
                     reset_values=reset_values,
+                    reset_then_reuse_values=reset_then_reuse_values,
                 )
                 changed = True
 

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

@@ -0,0 +1,75 @@
+---
+- name: Test helm reset_then_reuse_values
+  vars:
+    helm_namespace: "{{ test_namespace[9] }}"
+    chart_release_values:
+      replica:
+        replicaCount: 3
+      master:
+        count: 1
+        kind: Deployment
+    chart_reset_then_reuse_values:
+      replica:
+        replicaCount: 1
+      master:
+        count: 3
+  block:
+    - name: Initial chart installation
+      helm:
+        binary_path: "{{ helm_binary }}"
+        chart_ref: oci://registry-1.docker.io/bitnamicharts/redis
+        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
+          - '"--reset-then-reuse-values" not in install.command'
+          - release_value["status"]["values"] == chart_release_values
+
+    - name: Upgrade chart using reset_then_reuse_values=true
+      helm:
+        binary_path: "{{ helm_binary }}"
+        chart_ref: oci://registry-1.docker.io/bitnamicharts/redis
+        release_name: test-redis
+        release_namespace: "{{ helm_namespace }}"
+        reuse_values: false
+        reset_values: false
+        reset_then_reuse_values: true
+        release_values: "{{ chart_reset_then_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
+          - '"--reset-then-reuse-values" in upgrade.command'
+          - '"--reuse-values" not in upgrade.command'
+          - '"--reset-values" not in upgrade.command'
+          - release_value["status"]["values"] == chart_release_values | combine(chart_reset_then_reuse_values, recursive=true)
+
+  always:
+    - name: Remove helm namespace
+      k8s:
+        api_version: v1
+        kind: Namespace
+        name: "{{ helm_namespace }}"
+        state: absent

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

@@ -0,0 +1,94 @@
+---
+- 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 }}/test-chart-reuse-values"
+    test_release_name: "myrelease"
+
+  block:
+    - name: Install helm diff
+      kubernetes.core.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
+      ansible.builtin.copy:
+        src: "test-chart-reuse-values"
+        dest: "{{ helm_dir.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
+          phase: ci
+        wait: true
+
+    - name: Upgrade helm release (reset_values=false and reuse_values=false and reset_then_reuse_values=true)
+      kubernetes.core.helm:
+        binary_path: "{{ helm_binary }}"
+        chart_ref: "{{ test_chart_path }}"
+        reset_values: false
+        reuse_values: false
+        reset_then_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
+
+    - name: Upgrade helm release (reset_then_reuse_values=true with default value for reset_values and reuse_values=false)
+      kubernetes.core.helm:
+        binary_path: "{{ helm_binary }}"
+        chart_ref: "{{ test_chart_path }}"
+        reuse_values: false
+        reset_then_reuse_values: true
+        release_name: "{{ test_release_name }}"
+        release_namespace: "{{ helm_namespace }}"
+        values:
+          ansible_version: devel
+      register: helm_upgrade
+
+    - name: Ensure task reported change
+      assert:
+        that:
+          - helm_upgrade is changed
+
+  always:
+    - name: Remove temporary directory
+      file:
+        path: "{{ helm_dir.path }}"
+        state: absent
+      ignore_errors: true
+
+    - name: Uninstall helm diff
+      kubernetes.core.helm_plugin:
+        binary_path: "{{ helm_binary }}"
+        state: absent
+        plugin_name: diff
+      ignore_errors: true
+
+    - name: Remove helm namespace
+      kubernetes.core.k8s:
+        api_version: v1
+        kind: Namespace
+        name: "{{ helm_namespace }}"
+        state: absent
+      ignore_errors: true