Autostart Works Partially on Raspberry Pi

[ATATC]

As the title indicates, the program successfully launches, the systemd status is showing active, but no window shows up.

Investigation

Through a quick investigation, the window pops up by itself after configuring the X Window System.

[ATATC]

Cause

The true cause is that xHost is not running for some reason.

[ATATC]

In #157 we integrated the XWS configuring into the service script, however, it seems like that it does not support configuring through a systemd service (Authorization required, but no authorization specified).

[ATATC]

Cause

GDM uses Wayland instead of Xorg. That's why xhost >& /dev/null always returns false until xHost is manually triggered.

[ATATC]

There is an escape layer between Wayland and Xorg, called "xwayland".

[ATATC]

Investigation

The error "Authorization required, but no authorization specified" is due to the inexistence of "/home/$USERNAME/.Xauthority". "$XAUTHORITY" is accessible as a user.

Solution

Set the service environment variable XAUTHORITY to the value of the outer environment variable when creating the service.