fix(preinstall_config): Ensure hostname is defined in /etc/hosts file…

… to fix 'sudo: unable to resolve host' error message

roles/preinstall_config/README.md

@@ -19,11 +19,22 @@ The following software is required on the control node:
 Role Variables
 --------------
 
+The following facts are used by this role
+
+```yaml
+ansible_default_ipv4['address']: Use to configure static IP in /etc/hosts when `has_reserved_ip == true`
+```
+
 Variables in `defaults/main.yml` with default values
 
 ```yaml
 # non-root user to create on the Home Assistant server
 home_assistant_user: homeassistant
+
+# Set this to true if you have a static IP for the Raspberry Pi
+# When set to true, set the ipv4 address in /etc/hosts
+# When set to false, 127.0.1.1 will be set in /etc/hosts
+has_reserved_ip: false
 ```
 
 Dependencies

roles/preinstall_config/defaults/main.yml

@@ -1,2 +1,3 @@
 ---
-home_assistant_user: homeassistant
+home_assistant_user: homeassistant
+has_reserved_ip: false

roles/preinstall_config/tasks/main.yml

@@ -48,4 +48,12 @@
     state: present
     regexp: '^%sudo'
     line: '%sudo ALL=(ALL) NOPASSWD: ALL'
-    validate: 'visudo -cf %s'
+    validate: 'visudo -cf %s'
+
+- name: Ensure hostname is in /etc/hosts
+  lineinfile:
+    path: /etc/hosts
+    state: present
+    regexp: '{{ ansible_hostname }}$'
+    line: "{{ has_reserved_ip | ternary(ansible_default_ipv4['address'], '127.0.1.1') }} {{ ansible_hostname }}"
+    validate: 'visudo -cf %s'