Neptune 3 UI - Systemd Service Settings
There are three sections in Neptune 3 UI service file:
- [Unit]
- [Service]
- [Install]
[Unit] Section
This section describes the service itself, including dependencies and/or conflicts, as well as loading order.
The section consists of a number of variables, as follows:
| Variable | Description |
|---|---|
| Description=Neptune3-UI | Service description displayed by system tools |
| After=dbus.service dbus-session@root.service systemd-user-sessions.service ivi-services.target | Loading order (After=dbus.service). It means that Neptune 3 UI systemd Service will be loaded after dbus.service. Then goes dbus user session (there are two sessions - user and system session), and a number of services providing data for Neptune 3 UI (ivi-services.target). |
| Wants=ivi-services.target dbus-session@root.service | Tells that ivi-services.target and dbus user session are in direct dependence. |
| Conflicts=neptune-qsr.service Before=neptune-qsr.service OnFailure=neptune-qsr.service | These variables describe the startup behavior: first, neptune3-ui starts, then it conflicts with QSR Content app. Also, those variables mean that QSR content app should start, if neptune3-ui crashes. It could be just {conflicts}, but in this case systemd does not wait for complete shut down of Neptune 3 UI and shuts down both of the services. |
[Service] Section
This section describes, how the service starts up and what parameters are used for that.
| Variable | Description |
|---|---|
| User=root | Start as a root user (administrator in linux/unix). |
| ExecStart=/opt/neptune3/neptune3-ui -r --dbus session -c am-config-neptune.yaml | Sevice startup command. |
| WorkingDirectory=/opt/neptune3 | Catalog, to which systemd switches to before service is started. |
| EnvironmentFile=/etc/default/qt | Environment variables are loaded from the file in format Variable=value |
| Environment=AM_STARTUP_TIMER=1 | When set to "1", this variable enables measuring of time needed to start up the Neptune 3 UI. In this case, the measured time value is displayed in the system menu. When set to "0", the measuring of time needed to start up the Neptune 3 UI is turned off, and is not displayed in the system menu. |
| Environment=QT_QPA_EGLFS_HIDECURSOR=1 | This variable manages visibility of mouse cursor: when set to "1" mouse cursor is hidden, when set to "0" it is visible. |
[Install] Section
In this section it's determined, how the service file will be installed.
| Variable | Description |
|---|---|
| WantedBy=multi-user.target | In this use case the service file is a part of multi-user system target. That's why it will be installed as one of dependencies. |
Note: In any case of changes in .service file, it's necessary to run systemctl daemon-reload, otherwise systemd will not reload the file changes and will use the old file.
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