Make cgroup enabling idempotent and fix ansible lint checks.

---

- name: Check if cgroups enabled

  shell: cat /boot/firmware/cmdline.txt | grep cgroup

  register: cgroup_enabled

  when: ansible_distribution == 'Ubuntu'

  # grep will exit with 1 when no results found.

  # ignore_errors causes the task not to halt play.

  ignore_errors: true

- name: Enable cgroup via boot commandline if not already enabled

  lineinfile:

    path: /boot/firmware/cmdline.txt

    backrefs: yes

    regexp: "(.*)$"

    regexp: '^((?!.*\bcgroup_enable=cpuset cgroup_memory=1 cgroup_enable=memory\b).*)$'

    line: '\1 cgroup_enable=cpuset cgroup_memory=1 cgroup_enable=memory'

  when:

    - ansible_distribution == 'Ubuntu'

    - cgroup_enabled.stdout == ""

- name: Check if cgroups already running

  shell: cat /proc/cmdline | grep cgroup

  register: cgroup_running

- name: Read /proc/cmdline to check for cgroups already running

  shell: cat /proc/cmdline

  register: cmdline

  when:

    ansible_distribution == 'Ubuntu'

  # grep will exit with 1 when no results found.

  # ignore_errors causes the task not to halt play.

  ignore_errors: true

    - ansible_distribution == 'Ubuntu'

- name: Reboot to enable cgroups if not already running

  reboot:

  when:

    - ansible_distribution == 'Ubuntu'

    - cgroup_running.stdout == ""

    - '"cgroup_enable=cpuset cgroup_memory=1 cgroup_enable=memory" not in cmdline.stdout'