nagios-nrpe: fix allowed_hosts configuration: keep potential added IP, but we cannot use backrefs if the line does not exist yet

CHANGELOG

@@ -75,6 +75,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 * nagios-nrpe: grep in check_ipsecctl_critiques.sh was too large
 * post-install: fix missing space in generateldif.sh script
 * logsentry: fix variables for configuration files
+* nagios-nrpe: fix allowed_hosts configuration: keep potential added IP, but we cannot use backrefs if the line does not exist yet
 
 ### Removed
 

roles/nagios-nrpe/tasks/main.yml

@@ -46,13 +46,33 @@
   tags:
     - nagios-nrpe
 
-- name: "Allow NRPE hosts"
+- name: "Fetch nrpe config content"
+  command: 'grep "allowed_hosts=" /etc/nrpe.d/evolix.cfg'
+  check_mode: false
+  register: nrpe_config_content
+  failed_when: false
+  changed_when: false
+  tags:
+    - nagios-nrpe
+
+- name: "Allow NRPE hosts - if no allowed_hosts configured"
   lineinfile:
     dest: /etc/nrpe.d/evolix.cfg
     insertbefore: BOF
+    regex: "allowed_hosts={{ nagios_nrpe_allowed_hosts | join(',') }}"
+    line: 'allowed_hosts={{ nagios_nrpe_allowed_hosts | join(",") }}'
+  when: nrpe_config_content.rc != 0
+  tags:
+    - nagios-nrpe
+
+- name: "Allow NRPE hosts - if allowed_hosts already configured : keep added IP"
+  lineinfile:
+    dest: /etc/nrpe.d/evolix.cfg
     backrefs: true
-    regex: "allowed_hosts={{ nagios_nrpe_allowed_hosts | join(',') }}(.*)"
+    insertbefore: BOF
+    regex: "allowed_hosts={{ nagios_nrpe_allowed_hosts | join(',') }}(.*)*"
     line: 'allowed_hosts={{ nagios_nrpe_allowed_hosts | join(",") }}\1'
+  when: nrpe_config_content.rc == 0
   tags:
     - nagios-nrpe