roles/homeassistant: Deploy Home Assistant

This commit introduces a *homeassistant* role that installs and sets up
Home Assistant using `pip`.

homeassistant.yml

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+- hosts: home-assistant
+  roles:
+  - apache
+  - homeassistant
+  tasks:
+  - name: ensure homeassistant is running
+    service:
+      name: homeassistant
+      state: started
+  - name: ensure apache is running
+    service:
+      name: httpd
+      state: started

roles/homeassistant/files/hass.sh

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+#!/bin/sh
+
+exec /var/lib/homeassistant/.local/bin/hass

roles/homeassistant/files/homeassistant.service

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+# vim: set ft=systemd :
+[Unit]
+Description=Home Assistant
+
+[Service]
+Type=simple
+ExecStart=/usr/local/bin/hass
+User=homeassistant
+UMask=0077
+
+[Install]
+WantedBy=multi-user.target

roles/homeassistant/handlers/main.yml

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+- name: reload systemd
+  command: systemctl daemon-reload
+- name: restart homeassistant
+  service:
+    name: homeassistant
+    state: restarted
+- name: restart httpd
+  service:
+    name: homeassistant
+    state: restarted

roles/homeassistant/tasks/main.yml

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+- name: ensure system dependencies are installed
+  package:
+    name:
+    - python3-pip
+    state: present
+  tags:
+  - install
+
+- name: ensure homeassistant user exists
+  user:
+    name: homeassistant
+    system: true
+    home: /var/lib/homeassistant
+
+- name: ensure homeassistant is installed
+  become: true
+  become_user: homeassistant
+  pip:
+    name: homeassistant
+    extra_args: >-
+      --user
+
+- name: ensure homeassistant entry point is installed
+  copy:
+    src: hass.sh
+    dest: /usr/local/bin/hass
+    mode: '0755'
+  notify:
+  - restart homeassistant
+- name: ensure homeassistant systemd unit is installed
+  copy:
+    src: homeassistant.service
+    dest: /etc/systemd/system/homeassistant.service
+    mode: '0644'
+  notify:
+  - reload systemd
+  - restart homeassistant
+- name: ensure homeassistant starts at boot
+  service:
+    name: homeassistant
+    enabled: true
+
+- name: ensure apache is configured to proxy for homeassistant
+  template:
+    src: homeassistant.httpd.conf.j2
+    dest: /etc/httpd/conf.d/homeassistant.conf
+    mode: '0644'
+  notify:
+  - restart httpd
+- name: ensure selinux allows apache to proxy
+  seboolean:
+    name: httpd_can_network_connect
+    state: true
+    persistent: true

roles/homeassistant/templates/configuration.yaml.j2

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+homeassistant:
+  # Name of the location where Home Assistant is running
+  name: Home
+  # Location required to calculate the time the sun rises and sets
+  latitude: 38.9568
+  longitude: -94.6832
+  # Impacts weather/sunrise data (altitude above sea level in meters)
+  elevation: 0
+  # metric for Metric, imperial for Imperial
+  unit_system: imperial
+  # Pick yours from here: http://en.wikipedia.org/wiki/List_of_tz_database_time_zones
+  time_zone: America/Chicago
+  # Customization file
+  customize: !include customize.yaml
+
+# Configure a default setup of Home Assistant (frontend, api, etc)
+default_config:
+
+# Show the introduction message on startup.
+introduction:
+
+# Uncomment this if you are using SSL/TLS, running in Docker container, etc.
+# http:
+#   base_url: example.duckdns.org:8123
+http:
+  server_host: '::1'
+
+# Sensors
+sensor: !include sensors.yaml
+
+# Text to speech
+tts:
+  - platform: google
+
+group: !include groups.yaml
+automation: !include automations.yaml
+script: !include scripts.yaml

roles/homeassistant/templates/homeassistant.httpd.conf.j2

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+ProxyPreserveHost On
+ProxyRequests Off
+
+ProxyPass /api/websocket ws://localhost:8123/api/websocket
+ProxyPassReverse /api/websocket ws://localhost:8123/api/websocket
+ProxyPass / http://localhost:8123/
+ProxyPassReverse / http://localhost:8123/
+
+RewriteEngine on
+RewriteCond %{HTTP:Upgrade} =websocket [NC]
+RewriteRule /(.*)  ws://localhost:8123/$1 [P,L]
+RewriteCond %{HTTP:Upgrade} !=websocket [NC]
+RewriteRule /(.*)  http://localhost:8123/$1 [P,L]