r/nut: Add role for Network UPS Tools

The *nut* role installs and configures Network UPS Tools.

roles/nut/defaults/main.yml

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+nut_users: []
+nut_listen:
+  address: '::'
+  port: 3493
+nut_ups: []

roles/nut/handlers/main.yml

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+- name: restart nut
+  service:
+    name: nut-server
+    state: restarted

roles/nut/tasks/main.yml

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+- name: ensure nut is installed
+  package:
+    name: nut
+    state: present
+  tags:
+  - install
+
+- name: ensure upsd is configured
+  template:
+    src: upsd.conf.j2
+    dest: /etc/ups/upsd.conf
+    owner: root
+    group: nut
+    mode: 'o=rw,g=r,o='
+  notify:
+  - restart nut
+  tags:
+  - nut-config
+- name: ensure ups is configured
+  template:
+    src: ups.conf.j2
+    dest: /etc/ups/ups.conf
+    owner: root
+    group: nut
+    mode: 'o=rw,g=r,o='
+  notify:
+  - restart nut
+  tags:
+  - nut-config
+- name: ensure upsd users are configured
+  template:
+    src: upsd.users.j2
+    dest: /etc/ups/upsd.users
+    owner: root
+    group: nut
+    mode: 'o=rw,g=r,o='
+  notify:
+  - restart nut
+  tags:
+  - nut-users
+
+- name: ensure nut starts at boot
+  service:
+    name: nut-server
+    enabled: true
+  tags:
+  - service
+- name: ensure nut is running
+  service:
+    name: nut-server
+    state: started
+  tags:
+  - service
+
+- name: ensure firewall is configured for nut
+  firewalld:
+    port: '{{ nut_listen.port }}/tcp'
+    state: enabled
+    immediate: true
+    permanent: true
+  tags:
+  - firewalld

roles/nut/templates/ups.conf.j2

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+{% for name, settings in nut_ups.items() %}
+[{{ name }}]
+{% for setting in settings %}
+{% for key, value in setting|dictsort %}
+{{ key }} = "{{ value }}"
+{% endfor %}
+{% endfor %}
+{% endfor %}

roles/nut/templates/upsd.conf.j2

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+LISTEN {{ nut_listen.address }} {{ nut_listen.port }}

roles/nut/templates/upsd.users.j2

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+{% for username, settings in nut_users.items() %}
+[{{ username }}]
+{% for setting in settings %}
+{% for key, value in setting|dictsort %}
+{{ key }} = {{ value }}
+{% endfor %}
+{% endfor %}
+{% endfor %}