/home/travis/.ansible/roles/robertdebock.hostname/vars/main.yml 
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---
# vars file for hostname

_hostname_requirements:
  default:
    - hostname
  Amazon-2018:
    - net-tools
  Alpine:
    - net-tools

hostname_requirements: "{{ _hostname_requirements[ansible_distribution ~ '-' ~ ansible_distribution_major_version] | default(_hostname_requirements[ansible_distribution] | default(_hostname_requirements['default'])) }}"