Drop service facts usage

This change switches from using service facts to using systemctl
commands to do service checks. This is done to reduce the amount of
memory used as part of the deployment.

Change-Id: I0cd5b24933e50680baefd055d6e68e277ab09315
Related-Bug: #1915761

common/deploy-steps-tasks-step-0.j2.yaml

@@ -7,8 +7,11 @@
 - name: Ensure /var/log/journal exists
   become: true
   file: path=/var/log/journal state=directory mode=0750 owner=root group=root setype=var_log_t
-- name: Populate service facts
-  service_facts:
+- name: Check cloud-init status
+  shell: systemctl is-active cloud-init.service || systemctl is-enabled cloud-init.service
+  failed_when: false
+  become: true
+  register: cloud_init_enabled
 - name: Wait for cloud-init to finish, if enabled
   cloud_init_data_facts:
     filter: status
@@ -18,9 +21,9 @@
     not res.cloud_init_data_facts.status.v1.stage
   retries: 50
   delay: 5
-  when: >
-    'cloud-init.service' in ansible_facts.services and
-    ansible_facts.services['cloud-init.service']['status'] == 'enabled'
+  when:
+    - cloud_init_enabled.rc is defined
+    - cloud_init_enabled.rc == 0
 - name: Create /var/lib/container-puppet
   become: true
   no_log: True

deployment/nova/nova-compute-container-puppet.yaml

@@ -1424,8 +1424,11 @@ outputs:
           - name: disable KSM on compute
             when: not compute_ksm_enabled|bool
             block:
-            - name: Populate service facts (ksm)
-              service_facts: # needed to make yaml happy
+            - name: Check for ksm
+              shell: systemctl is-active ksm.service || systemctl is-enabled ksm.service
+              become: true
+              failed_when: false
+              register: ksm_service_check
             - name: disable KSM services
               service:
                 name: "{{ item }}"
@@ -1434,7 +1437,9 @@ outputs:
               with_items:
                 - ksm.service
                 - ksmtuned.service
-              when: "'ksm.service' in ansible_facts.services"
+              when:
+                - ksm_service_check.rc is defined
+                - ksm_service_check.rc == 0
               register: ksmdisabled
             # When KSM is disabled, any memory pages that were shared prior to
             # deactivating KSM are still shared. To delete all of the PageKSM
@@ -1442,13 +1447,12 @@ outputs:
             - name: delete PageKSM after disable ksm on compute
               command: echo 2 >/sys/kernel/mm/ksm/run
               when:
-                - "'ksm.service' in ansible_facts.services"
+                - ksm_service_check.rc is defined
+                - ksm_service_check.rc == 0
                 - ksmdisabled is changed
           - name: enable KSM on compute
             when: compute_ksm_enabled|bool
             block:
-            - name: Populate service facts (ksm)
-              service_facts: # needed to make yaml happy
             # mschuppert: we can remove the CentOS/RHEL split here when CentOS8/
             # RHEL8 is available and we have the same package name providing the
             # KSM services

deployment/timesync/chrony-baremetal-ansible.yaml

@@ -106,14 +106,19 @@ outputs:
           dport: 123
           proto: udp
       host_prep_tasks:
-        - name: Populate service facts (chrony)
-          service_facts: # needed to make yaml happy
+        - name: Check for NTP service
+          shell: systemctl is-active ntpd.service || systemctl is-enabled ntpd.service
+          failed_when: false
+          become: true
+          register: ntp_service_check
         - name: Disable NTP before configuring Chrony
           service:
               name: ntpd
               state: stopped
               enabled: no
-          when: "'ntpd.service' in ansible_facts.services"
+          when:
+            - ntp_service_check.rc is defined
+            - ntp_service_check.rc == 0
         - name: Install, Configure and Run Chrony
           include_role:
             name: chrony