helm: Add replace parameter

Fixes: #106

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

changelogs/fragments/106-helm_replace.yml

@@ -0,0 +1,2 @@
+bugfixes:
+- helm - add replace parameter (https://github.com/ansible-collections/community.kubernetes/issues/106).

molecule/default/roles/helm/tasks/tests_chart.yml

@@ -201,6 +201,63 @@
     that:
       - install is not changed
 
+# Test --replace
+- name: Install chart for replace option
+  helm:
+    binary_path: "{{ helm_binary }}"
+    name: test-0001
+    chart_ref: "{{ chart_source }}"
+    chart_version: "{{ chart_source_version | default(omit) }}"
+    namespace: "{{ helm_namespace }}"
+  register: install
+
+- name: "Assert that {{ chart_test }} chart is installed from {{ source }}"
+  assert:
+    that:
+      - install is changed
+
+- name: Remove {{ chart_test }} with --purge
+  helm:
+    binary_path: "{{ helm_binary }}"
+    state: absent
+    name: test-0001
+    purge: False
+    namespace: "{{ helm_namespace }}"
+  register: install
+
+- name: Check if chart is removed
+  assert:
+    that:
+      - install is changed
+
+- name: Install chart again with same name test-0001
+  helm:
+    binary_path: "{{ helm_binary }}"
+    name: test-0001
+    chart_ref: "{{ chart_source }}"
+    chart_version: "{{ chart_source_version | default(omit) }}"
+    namespace: "{{ helm_namespace }}"
+    replace: True
+  register: install
+
+- name: "Assert that {{ chart_test }} chart is installed from {{ source }}"
+  assert:
+    that:
+      - install is changed
+
+- name: Remove {{ chart_test }} (cleanup)
+  helm:
+    binary_path: "{{ helm_binary }}"
+    state: absent
+    name: test-0001
+    namespace: "{{ helm_namespace }}"
+  register: install
+
+- name: Check if chart is removed
+  assert:
+    that:
+      - install is changed
+
 - name: Remove helm namespace
   k8s:
     api_version: v1

plugins/modules/helm.py

@@ -115,6 +115,13 @@
     type: bool
     default: False
     version_added: "0.11.1"
+  replace:
+    description:
+      - Reuse the given name, only if that name is a deleted release which remains in the history.
+      - This is unsafe in production environment.
+    type: bool
+    default: False
+    version_added: "1.11.0"
 extends_documentation_fragment:
   - community.kubernetes.helm_common_options
 '''
@@ -320,14 +327,20 @@ def fetch_chart_info(command, chart_ref):
     return yaml.safe_load(out)
 
 
-def deploy(command, release_name, release_values, chart_name, wait, wait_timeout, disable_hook, force, atomic=False, create_namespace=False):
+def deploy(command, release_name, release_values, chart_name, wait,
+           wait_timeout, disable_hook, force, atomic=False, create_namespace=False,
+           replace=False):
     """
     Install/upgrade/rollback release chart
     """
-    deploy_command = command + " upgrade -i"  # install/upgrade
+    if replace:
+        # '--replace' is not supported by 'upgrade -i'
+        deploy_command = command + " install"
+    else:
+        deploy_command = command + " upgrade -i"  # install/upgrade
 
-    # Always reset values to keep release_values equal to values released
-    deploy_command += " --reset-values"
+        # Always reset values to keep release_values equal to values released
+        deploy_command += " --reset-values"
 
     if wait:
         deploy_command += " --wait"
@@ -340,6 +353,9 @@ def deploy(command, release_name, release_values, chart_name, wait, wait_timeout
     if force:
         deploy_command += " --force"
 
+    if replace:
+        deploy_command += " --replace"
+
     if disable_hook:
         deploy_command += " --no-hooks"
 
@@ -399,6 +415,7 @@ def main():
             wait_timeout=dict(type='str'),
             atomic=dict(type='bool', default=False),
             create_namespace=dict(type='bool', default=False),
+            replace=dict(type='bool', default=False),
         ),
         required_if=[
             ('release_state', 'present', ['release_name', 'chart_ref']),
@@ -432,6 +449,7 @@ def main():
     wait_timeout = module.params.get('wait_timeout')
     atomic = module.params.get('atomic')
     create_namespace = module.params.get('create_namespace')
+    replace = module.params.get('replace')
 
     if bin_path is not None:
         helm_cmd_common = bin_path
@@ -455,6 +473,10 @@ def main():
     # keep helm_cmd_common for get_release_status in module_exit_json
     helm_cmd = helm_cmd_common
     if release_state == "absent" and release_status is not None:
+
+        if not replace and replace:
+            module.fail_json(msg="replace is not applicable when state is absent")
+
         helm_cmd = delete(helm_cmd, release_name, purge, disable_hook)
         changed = True
     elif release_state == "present":
@@ -470,13 +492,15 @@ def main():
 
         if release_status is None:  # Not installed
             helm_cmd = deploy(helm_cmd, release_name, release_values, chart_ref, wait, wait_timeout,
-                              disable_hook, False, atomic=atomic, create_namespace=create_namespace)
+                              disable_hook, False, atomic=atomic, create_namespace=create_namespace,
+                              replace=replace)
             changed = True
 
         elif force or release_values != release_status['values'] \
                 or (chart_info['name'] + '-' + chart_info['version']) != release_status["chart"]:
             helm_cmd = deploy(helm_cmd, release_name, release_values, chart_ref, wait, wait_timeout,
-                              disable_hook, force, atomic=atomic, create_namespace=create_namespace)
+                              disable_hook, force, atomic=atomic, create_namespace=create_namespace,
+                              replace=replace)
             changed = True
 
     if module.check_mode: