magnum: support kubeconfig configuration file

If a file {{ node_custom_config }}/magnum/kubeconfig exists, it is
copied to /var/lib/magnum/.kube/config in all Magnum Service Containers.
At this location, the vexxhost/magnum-cluster-api will loo for the Kubeconfig
configuration file to control the Cluster API Control Plane. If the
vexxhost/magnum-cluster-api is installed in the Magnum container images,
control of a cluster API control plane can then take place via the Magnum API.

Depends-On: https://review.opendev.org/c/openstack/kolla/+/902101
Change-Id: I986c5192fe96b9c480a2d8fa87d719a50ce78186

ansible/roles/magnum/tasks/config.yml

@@ -31,6 +31,33 @@
   when:
     - magnum_policy.results
 
+- name: Check if kubeconfig file is supplied
+  stat:
+    path: "{{ node_custom_config }}/magnum/kubeconfig"
+  delegate_to: localhost
+  run_once: True
+  register: magnum_kubeconfig_file
+
+- name: Copying over kubeconfig file
+  template:
+    src: "{{ node_custom_config }}/magnum/kubeconfig"
+    dest: "{{ node_config_directory }}/{{ item.key }}/kubeconfig"
+    mode: "0660"
+  become: true
+  when:
+    - inventory_hostname in groups[item.value.group]
+    - item.value.enabled | bool
+    - magnum_kubeconfig_file.stat.exists
+  with_dict: "{{ magnum_services }}"
+  notify:
+    - Restart {{ item.key }} container
+
+- name: Set magnum kubeconfig file's path
+  set_fact:
+    magnum_kubeconfig_file_path: "{{ magnum_kubeconfig_file.stat.path }}"
+  when:
+    - magnum_kubeconfig_file.stat.exists
+
 - include_tasks: copy-certs.yml
   when:
     - kolla_copy_ca_into_containers | bool

ansible/roles/magnum/templates/magnum-api.json.j2

@@ -6,7 +6,14 @@
             "dest": "/etc/magnum/magnum.conf",
             "owner": "magnum",
             "perm": "0600"
-        }{% if magnum_policy_file is defined %},
+        }{% if magnum_kubeconfig_file_path is defined %},
+        {
+            "source": "{{ container_config_directory }}/kubeconfig",
+            "dest": "/var/lib/magnum/.kube/config",
+            "owner": "magnum",
+            "perm": "0600"
+        }{% endif %}
+        {% if magnum_policy_file is defined %},
         {
             "source": "{{ container_config_directory }}/{{ magnum_policy_file }}",
             "dest": "/etc/magnum/{{ magnum_policy_file }}",

ansible/roles/magnum/templates/magnum-conductor.json.j2

@@ -6,7 +6,14 @@
             "dest": "/etc/magnum/magnum.conf",
             "owner": "magnum",
             "perm": "0600"
-        }{% if magnum_policy_file is defined %},
+        }{% if magnum_kubeconfig_file_path is defined %},
+        {
+            "source": "{{ container_config_directory }}/kubeconfig",
+            "dest": "/var/lib/magnum/.kube/config",
+            "owner": "magnum",
+            "perm": "0600"
+        }{% endif %}
+        {% if magnum_policy_file is defined %},
         {
             "source": "{{ container_config_directory }}/{{ magnum_policy_file }}",
             "dest": "/etc/magnum/{{ magnum_policy_file }}",

releasenotes/notes/magnum-kubeconfig-71934a2980c7e74f.yaml

@@ -0,0 +1,5 @@
+---
+features:
+  - |
+    Adds support for copying in ``{{ node_custom_config }}/magnum/kubeconfig``
+    to Magnum containers for ``magnum-cluster-api`` driver.