A sessiond-based session should be started via a display manager, using the provided
sessiond session desktop entry.
For example, configure
lightdm to start a sessiond session by setting
To use sessiond alongside a window manager, the window manager service must include:
[Unit] Description=Window manager Requires=sessiond-session.target After=sessiond.service PartOf=graphical-session.target [Service] ExecStart=/usr/bin/twm Restart=always [Install] Alias=window-manager.service
Enable the window manager service with
systemctl --user enable twm.service. Now, when the
sessiond session is started via the display manager, this service will run as the window manager and the session will be stopped when it exits.
sessiond-session.target binds to
graphical-session.target provided by systemd. See graphical-session.target in systemd.special(7) for more information about graphical sessions.
To run a service in the graphical session,
<service>.service should contain:
so the service is stopped when the session ends, and:
so the service is started when the session begins.
It can then be enabled with
systemctl --user enable <service>.
Example services can be found here.
The session can be stopped with
sessionctl stop. This will stop
graphical-session.target and all units that are part of the session.
A service that is part of the graphical session can be responsible for stopping the session. To configure a service to stop the session when it exits, include:
[Service] ExecStopPost=/usr/bin/sessionctl stop
By default, the session is locked when it becomes idle and before sleeping. This is configured in the
[Lock] section of the configuration file. The session can be manually locked by running
To configure a service to act as the screen locker, include:
[Service] ExecStopPost=/usr/bin/sessionctl unlock
so the session is considered unlocked when the locker exits, and:
so the service is started when the session locks. Then enable it.
Below is an example
[Unit] Description=Lock X session with i3lock PartOf=graphical-session.target [Service] ExecStart=/usr/bin/i3lock -n -c 000000 ExecStopPost=/usr/bin/sessionctl unlock [Install] WantedBy=graphical-lock.target
Inhibitor locks can be acquired when the session should be considered active while a given command is running, e.g. a media player.
sessiond-inhibit script provides a simple interface to acquire a lock before running a command and release it when the command returns.
usage: sessiond-inhibit [-h] [-w WHO] [-y WHY] [-s] [-i] [-u [ID]] [command] With no command, list running inhibitors. positional arguments: command Command to run optional arguments: -h, --help show this help message and exit -w WHO, --who WHO Set who is inhibiting -y WHY, --why WHY Set why this inhibitor is running -s, --stop Stop running inhibitors -i, --inhibit Inhibit without a command -u [ID], --uninhibit [ID] Uninhibit last inhibitor or by ID
See sessiond-inhibit(1) for more information.
See the DBus Service section of sessiond(1) for descriptions of inhibitor-related methods.