Use ansible_cmdline to detect cgroup status

tasks/main.yml

@@ -61,29 +61,25 @@
   notify:
     - 'ensure_docker.package_facts'
     - 'ensure_docker.service_facts'
-- name: 'Fetch kernel command line'
+- name: 'Ensure cgroups are v1 only'
   when:
     - ansible_system == 'Linux'
     - ensure_docker is defined
     - ansible_distribution == 'Fedora'
     - ansible_distribution_major_version is version('32', '>=')
-  shell: |
-    cat /proc/cmdline
-  register: 'results'
-  changed_when: 'false'
-- name: 'Add cgroups v1 if disabled'
-  when:
-    - results is defined
-    - results.stdout is defined
-    - ' "systemd.unified_cgroup_hierarchy=0" not in results.stdout '
+    - ansible_cmdline is defined
+    - ansible_cmdline['systemd.unified_cgroup_hierarchy'] is not defined
   shell:
     cmd: |
       grubby --update-kernel=ALL --args=systemd.unified_cgroup_hierarchy=0
 - name: 'Reboot to enable cgroups v1'
   when:
-    - results is defined
-    - results.stdout is defined
-    - ' "systemd.unified_cgroup_hierarchy=0" not in results.stdout '
+    - ansible_system == 'Linux'
+    - ensure_docker is defined
+    - ansible_distribution == 'Fedora'
+    - ansible_distribution_major_version is version('32', '>=')
+    - ansible_cmdline is defined
+    - ansible_cmdline['systemd.unified_cgroup_hierarchy'] is not defined
   reboot:
 - name: 'flush handlers'
   meta: 'flush_handlers'