Role test-prerequisites: improve tasks; update OS to current debian

stable

roles/test-prerequisites/tasks/main.yml

@@ -1,25 +1,23 @@
 ---
-
 - name: assert IPv4 DNS entry
-  local_action: shell dig A {{ inventory_hostname }} | egrep '^{{ inventory_hostname }}'
+  local_action: shell dig +short A {{ inventory_hostname }} | egrep '^{{ ansible_default_ipv4.address }}'
   changed_when: False
-  when: "{{ require_dns | default('True') }}"
 
 - name: assert IPv6 DNS entry
-  local_action: shell dig AAAA {{ inventory_hostname }} | egrep '^{{ inventory_hostname }}'
+  local_action: shell dig +short AAAA {{ inventory_hostname }} | egrep '^{{ ansible_default_ipv6.address }}'
   changed_when: False
-  when: "{{ require_dns | default('True') }}"
 
-- name: test access to admin account (ssh key neccessary!)
+- name: Test access to admin account
   command: "true"
   changed_when: False
 
-- name: test access to root account
+- name: Test root access for admin account
   command: "true"
   changed_when: False
   become: True
-  become_user: root
 
-- name: fail on wrong OS type and version  # TODO: include debian
+- name: Check for correct OS type and version
   fail: msg="unsupported OS type or version - {{ ansible_distribution }} {{ ansible_distribution_major_version }}"
-  when: not ( ( ansible_distribution=="Ubuntu" and ansible_distribution_major_version|int==14 ) or ( ansible_distribution=="Debian" and ansible_distribution_major_version|int==8 ) )
+  when:
+    - ansible_distribution != "Debian"
+    - ansible_distribution_major_version|int != "9"