display error when hook fails

files/acme_renew_cert.py

@@ -308,7 +308,11 @@ class Domain(PrivateKey):
     def run_hooks(self) -> None:
         for hook in self.hooks:
             logging.info(f"Running hook: '{hook}'")
-            subprocess.run(hook.split())
+            hook_res = subprocess.run(hook.split(),
+                                      stdout=subprocess.DEVNULL,
+                                      stderr=subprocess.PIPE)
+            if hook_res.returncode != 0:
+                logging.error(f"Unable to run hook: {hook_res.stderr}")
 
 
 def main():

tasks/main.yml

@@ -84,7 +84,9 @@
   tags: acme_install
 
 - name: Perform ACME challenge for each domain
-  command: acme-renew-cert -v -c {{ acme_config_file | quote }}
+  command: acme-renew-cert -c {{ acme_config_file | quote }}
+  changed_when: "'No domain to renew' not in _acme_challenge.stdout"
+  register: _acme_challenge
   tags: acme_challenge
 
 - name: Setup cron job for ACME certificates renewal of {{ domain_name }}