Move TinyPilot systemd service to Debian package (#1506)

Resolves #1430

Notes
1. The TinyPilot systemd service config template has been converted into
a static file and the Jinja2 variables has been inlined. Specifically:
    * `tinypilot_user`
    * `tinypilot_dir `
2. The following Ansible variables have been dropped because they are no
longer being used:
    * `tinypilot_user`
    * `tinypilot_group`
    * `tinypilot_dir`
    * `tinypilot_privileged_dir `
4. All the `ansible-role` handlers have also been dropped because they
are no longer used

You can test this PR on a device using:
```bash
curl \
  --silent \
  --show-error \
  --location \
  https://raw.githubusercontent.com/tiny-pilot/tinypilot/master/scripts/install-bundle | \
  sudo bash -s -- \
    https://output.circle-artifacts.com/output/job/bde586ac-7a10-42ec-bb6f-2cb293915cae/artifacts/0/bundler/dist/tinypilot-community-20230719T1211Z-1.9.0-35+768bef5.tgz
```

<a data-ca-tag
href="https://codeapprove.com/pr/tiny-pilot/tinypilot/1506"><img
src="https://codeapprove.com/external/github-tag-allbg.png" alt="Review
on CodeApprove" /></a>

ansible-role/defaults/main.yml

@@ -2,4 +2,3 @@
 # Specifies the filesystem path or URL of a Debian package that installs
 # TinyPilot.
 tinypilot_debian_package_path: null
-tinypilot_enable_debug_logging: no

ansible-role/tasks/main.yml

@@ -7,21 +7,3 @@
 - name: install TinyPilot Debian package
   apt:
     deb: "{{ tinypilot_debian_package_path }}"
-  notify:
-    - restart TinyPilot service
-
-- name: install TinyPilot as a service
-  template:
-    src: tinypilot.systemd.j2
-    dest: /lib/systemd/system/tinypilot.service
-    owner: root
-    group: root
-    mode: "0644"
-  notify:
-    - reload TinyPilot systemd config
-    - restart TinyPilot service
-
-- name: enable systemd TinyPilot service file
-  systemd:
-    name: tinypilot
-    enabled: yes

ansible-role/vars/main.yml

@@ -1,13 +1,4 @@
 ---
-# TinyPilot's get-tinypilot.sh script (which it uses for installation and
-# updates) relies on the tinypilot user being named "tinypilot" so changing this
-# value will break updates.
-tinypilot_user: tinypilot
-tinypilot_group: tinypilot
-
-tinypilot_dir: /opt/tinypilot
-tinypilot_privileged_dir: /opt/tinypilot-privileged
-
 # uStreamer variables are placed here, instead of in `defaults/main.yml`,
 # in order to elevate their variable precedence. These variables will now
 # override the default variables in the uStreamer role.

debian-pkg/debian/rules

@@ -13,6 +13,7 @@ export DEB_BUILD_OPTIONS=noddebs
 	dh $@ --with python-virtualenv
 
 override_dh_installsystemd:
+	dh_installsystemd --name=tinypilot
 	dh_installsystemd --name=tinypilot-updater --no-start --no-enable
 	dh_installsystemd --name=usb-gadget --no-start
 

ansible-role/templates/tinypilot.systemd.j2 → debian-pkg/debian/tinypilot.service

@@ -6,13 +6,10 @@ StartLimitIntervalSec=0
 
 [Service]
 Type=simple
-User={{ tinypilot_user }}
-WorkingDirectory={{ tinypilot_dir }}
-ExecStart={{ tinypilot_dir }}/venv/bin/python app/main.py
+User=tinypilot
+WorkingDirectory=/opt/tinypilot
+ExecStart=/opt/tinypilot/venv/bin/python app/main.py
 Environment=APP_SETTINGS_FILE=/home/tinypilot/app_settings.cfg
-{% if tinypilot_enable_debug_logging %}
-Environment=DEBUG=1
-{% endif %}
 Restart=always
 
 [Install]