---

- name: Install packages that allow apt to be used over HTTPS
  become: true
  vars:
    packages:
      - apt-transport-https
      - ca-certificates
      - curl
  ansible.builtin.apt:
    name: "{{ packages }}"
    state: latest
    update_cache: yes
    cache_valid_time: 3600

- name: Setup Kubernetes repository
  become: true
  block:
    - name: Add apt signing key for Google Cloud
      ansible.builtin.get_url:
        url: https://packages.cloud.google.com/apt/doc/apt-key.gpg
        dest: /etc/apt/keyrings/kubernetes-archive-keyring.gpg

    - name: Add Kubernetes repository
      ansible.builtin.apt_repository:
        repo: deb [signed-by=/etc/apt/keyrings/kubernetes-archive-keyring.gpg] https://apt.kubernetes.io/ kubernetes-xenial main
        state: present

    - name: Update apt cache
      ansible.builtin.apt:
        update_cache: yes

- name: Get Kubernetes package version
  ansible.builtin.shell: "apt-cache show kubeadm | grep -F 'Version: {{ k8s_version }}.' | cut -d' ' -f2 | sort -n | tail -n 1"
  register: k8s_pkg_ver

- name: Setup Kubernetes packages
  become: true
  vars:
    packages:
      - kubelet={{ k8s_pkg_ver.stdout }}
      - kubeadm={{ k8s_pkg_ver.stdout }}
      - kubectl={{ k8s_pkg_ver.stdout }}
  block:
    - name: Install kubelet, kubeadm and kubectl
      ansible.builtin.apt:
        name: "{{ packages }}"
        state: present
        update_cache: yes
        allow_downgrade: no
        cache_valid_time: 3600

    - name: Hold Kubernetes packages
      loop: "{{ packages }}"
      ansible.builtin.dpkg_selections:
        name: "{{ item }}"
        selection: hold

# Container runtime configuration
- name: Prepare for container runtime installation
  become: true
  vars:
    mod_file: /etc/modules-load.d/k8s.conf
    sysctl_file: /etc/sysctl.d/k8s.conf
  block:
    - name: Copy module config
      ansible.builtin.copy:
        src: "files{{ mod_file }}"
        dest: "{{ mod_file }}"

    - name: Load module
      loop: "{{ lookup('file', 'files{{ mod_file }}').splitlines() }}"
      community.general.modprobe:
        name: "{{ item }}"
        state: present

    - name: Configure sysctl
      ansible.posix.sysctl:
        sysctl_file: "{{ sysctl_file }}"
        name: "{{ item.name }}"
        value: "{{ item.value }}"
        state: present
        reload: false
      with_items:
        - { name: "net.bridge.bridge-nf-call-iptables", value: "1" }
        - { name: "net.bridge.bridge-nf-call-ip6tables", value: "1" }
        - { name: "net.ipv4.ip_forward", value: "1" }
        - { name: "vm.swappiness", value: "0" }
      register: sysctl

    - name: Reload sysctl
      ansible.builtin.command: "sysctl --system"
      when: sysctl.changed

- name: Setup CRI-O
  become: true
  vars:
    os: xUbuntu_{{ ansible_distribution_version}}
    key_dir: /usr/share/keyrings
    keys:
      {
        "libcontainers":
          {
            "url": "https://download.opensuse.org/repositories/devel:/kubic:/libcontainers:/stable/{{ os }}/Release.key",
            "name": "libcontainers-archive-keyring",
          },
        "libcontainers-crio":
          {
            "url": "https://download.opensuse.org/repositories/devel:/kubic:/libcontainers:/stable:/cri-o:/{{ k8s_version }}/{{ os }}/Release.key",
            "name": "libcontainers-crio-archive-keyring",
          },
      }
    repos:
      - deb [signed-by={{ key_dir }}/libcontainers-archive-keyring.gpg] https://download.opensuse.org/repositories/devel:/kubic:/libcontainers:/stable/{{ os }}/ /
      - deb [signed-by={{ key_dir }}/libcontainers-crio-archive-keyring.gpg] https://download.opensuse.org/repositories/devel:/kubic:/libcontainers:/stable:/cri-o:/{{ k8s_version }}/{{ os }}/ /
  block:
    - name: Download signing keys
      with_dict: "{{ keys }}"
      ansible.builtin.get_url:
        url: "{{ item.value['url'] }}"
        dest: "/tmp/{{ item.value['name'] }}.key"

    - name: Install signing keys
      with_dict: "{{ keys }}"
      ansible.builtin.command: "gpg --batch --yes --dearmor -o {{ key_dir }}/{{ item.value['name'] }}.gpg /tmp/{{ item.value['name'] }}.key"

    - name: Add libcontainer repositories
      loop: "{{ repos }}"
      ansible.builtin.apt_repository:
        repo: "{{ item }}"
        state: present

    - name: Install CRI-O
      vars:
        packages:
          - cri-o
          - cri-o-runc
      ansible.builtin.apt:
        name: "{{ packages }}"
        state: present
        update_cache: yes

    - name: Start and enable crio
      ansible.builtin.service:
        name: crio
        state: started
        enabled: true