- name: Install the zram generator
  ansible.builtin.apt:
    name: systemd-zram-generator
    state: present
  register: base_zram_pkg
  when: swap.zram | default({}) | length > 0

- name: Create the zram generator drop-in directory
  ansible.builtin.file:
    path: /etc/systemd/zram-generator.conf.d
    state: directory
    owner: root
    group: root
    mode: "0755"
  when: swap.zram | default({}) | length > 0

- name: Configure zram swap devices
  ansible.builtin.template:
    src: zram-generator.conf.j2
    dest: "/etc/systemd/zram-generator.conf.d/{{ item.key }}.conf"
    owner: root
    group: root
    mode: "0644"
  loop: "{{ swap.zram | default({}) | dict2items }}"
  loop_control:
    label: "{{ item.key }}"
  register: base_zram_conf

- name: Reload systemd to run the zram generator
  ansible.builtin.systemd_service:
    daemon_reload: true
  when: >-
    base_zram_conf is changed
    or base_zram_pkg is changed

- name: Start zram swap devices
  ansible.builtin.systemd_service:
    name: "systemd-zram-setup@{{ item.key }}.service"
    state: started
  loop: "{{ swap.zram | default({}) | dict2items }}"
  loop_control:
    label: "{{ item.key }}"

- name: Allocate the swapfile
  ansible.builtin.command:
    cmd: >-
      dd if=/dev/zero of={{ base_swapfile_path }}
      bs=1M count={{ swap.file.size_mb }}
    creates: "{{ base_swapfile_path }}"
  when: swap.file is defined

- name: Secure and label the swapfile
  ansible.builtin.file:
    path: "{{ base_swapfile_path }}"
    owner: root
    group: root
    mode: "0600"
    setype: >-
      {{ (selinux is defined and selinux is not false)
        | ternary('swapfile_t', omit) }}
  when: swap.file is defined

- name: Check the swapfile for a swap signature
  ansible.builtin.command:
    cmd: "blkid -p -s TYPE -o value {{ base_swapfile_path }}"
  register: base_swapfile_sig
  changed_when: false
  failed_when: false
  when: swap.file is defined

- name: Format the swapfile
  ansible.builtin.command:
    cmd: "mkswap {{ base_swapfile_path }}"
  register: base_mkswap
  changed_when: base_mkswap.rc == 0
  when:
    - swap.file is defined
    - (base_swapfile_sig.stdout | default('')) != 'swap'

- name: Add the swapfile to fstab
  ansible.posix.mount:
    path: none
    src: "{{ base_swapfile_path }}"
    fstype: swap
    opts: "sw,pri={{ swap.file.priority | default(10) }}"
    state: present
  when: swap.file is defined

- name: List active swap devices
  ansible.builtin.command:
    cmd: swapon --show=NAME --noheadings
  register: base_swap_active
  changed_when: false
  when: swap.file is defined

- name: Enable the swapfile
  ansible.builtin.command:
    cmd: >-
      swapon --priority {{ swap.file.priority | default(10) }}
      {{ base_swapfile_path }}
  register: base_swapon
  changed_when: base_swapon.rc == 0
  when:
    - swap.file is defined
    - base_swapfile_path not in (base_swap_active.stdout_lines | default([]))

- name: Configure virtual memory sysctls
  ansible.posix.sysctl:
    name: "{{ item.key }}"
    value: "{{ item.value }}"
    sysctl_file: "{{ base_swap_sysctl_file }}"
    sysctl_set: true
    reload: true
    state: present
  loop: "{{ swap.sysctls | default({}) | dict2items }}"
  loop_control:
    label: "{{ item.key }}"