Fix kube-router config generation (#5531)

Signed-off-by: Arthur Outhenin-Chalandre <arthur@cri.epita.fr>

roles/network_plugin/kube-router/tasks/main.yml

@@ -19,7 +19,63 @@
     owner: kube
     remote_src: yes
 
+- name: kube-router | Create config directory
+  file:
+    path: /var/lib/kube-router
+    state: directory
+    owner: kube
+    recurse: true
+    mode: 0755
+
+- name: kube-router | Create kubeconfig
+  template:
+    src: kubeconfig.yml.j2
+    dest: /var/lib/kube-router/kubeconfig
+    owner: kube
+  notify:
+    - reset_kube_router
+
+- name: kube-router | Slurp cni config
+  slurp:
+    src: /etc/cni/net.d/10-kuberouter.conf
+  register: cni_config_slurp
+  ignore_errors: true
+
+- name: kube-router | Set cni_config variable
+  set_fact:
+    cni_config: "{{ cni_config_slurp.content | b64decode | from_json }}"
+  when:
+    - not cni_config_slurp.failed
+
+- name: kube-router | Set host_subnet variable
+  set_fact:
+    host_subnet: "{{ cni_config.ipam.subnet }}"
+  when:
+    - cni_config is defined
+    - cni_config.ipam is defined
+    - cni_config.ipam.subnet is defined
+
+- name: kube-router | Set wanted cni config variable
+  set_fact:
+    wanted_cni_config: "{{ lookup('template', 'cni-conf.json.j2') }}"
+
+- name: kube-router | Set wanted_cni_config variable
+  set_fact:
+    wanted_cni_config: "{{ wanted_cni_config | combine({ 'ipam': { 'subnet': host_subnet }}, recursive=True) }}"
+  when: host_subnet is defined
+
+- name: kube-router | Create cni config
+  copy:
+    content: "{{ wanted_cni_config | to_nice_json }}"
+    dest: /etc/cni/net.d/10-kuberouter.conf
+    owner: kube
+  changed_when: wanted_cni_config != cni_config
+  notify:
+    - reset_kube_router
+
 - name: kube-router | Create manifest
   template:
     src: kube-router.yml.j2
     dest: "{{ kube_config_dir }}/kube-router.yml"
+  delegate_to: "{{ groups['kube-master'] | first }}"
+  run_once: true