Use lineinfile to check domain list content

tasks/create-cert-standalone.yml

@@ -14,10 +14,11 @@
   when: not letsencrypt_cert_exists.stat.exists
 
 - name: Persist domain list to host
-  copy:
-    content: "{{ cert_item.domains }}"
-    dest: /etc/letsencrypt/domains-{{ cert_item.domains | first }}
-  when: letsencrypt_cert_updated.rc != 0
+  lineinfile:
+    path: /etc/letsencrypt/domains-{{ cert_item.domains | first }}
+    line: "{{ cert_item.domains }}"
+    state: present
+  when: letsencrypt_cert_updated
 
 - name: Start services after cert has been generated.
   service:

tasks/test-cert-exists.yml

@@ -5,17 +5,14 @@
   register: letsencrypt_cert_exists
 
 - name: Check if certificate has changed.
-  command: grep -Fxq "{{ cert_item.domains }}" /etc/letsencrypt/domains-{{ cert_item.domains | first }}
-  register: letsencrypt_cert_updated
-  check_mode: no
-  ignore_errors: yes
-  changed_when: no
+  lineinfile:
+    path: /etc/letsencrypt/domains-{{ cert_item.domains | first }}
+    line: "{{ cert_item.domains }}"
+    state: present
+  check_mode: yes
+  register: letsencrypt_cert_contents
   when: letsencrypt_cert_exists.stat.exists
 
-- debug:
-    msg: Not changed
-  when: letsencrypt_cert_updated.rc == 0
-
-- debug:
-    msg: Changed
-  when: letsencrypt_cert_updated.rc != 0
+- set_fact:
+    letsencrypt_cert_updated: "{{ (letsencrypt_cert_contents | changed) or (letsencrypt_cert_contents | failed) }}"
+  when: letsencrypt_cert_exists.stat.exists