[systemd-devel] Xorg or Wayland Environment

[Ed Greshko]

On 19/09/2021 21:39, Michael Biebl wrote:
> A useful command in this context is
>
> systemctl --user show-environment

OK, that was helpful.  But leads to another question.

How to run the service only if KDE_FULL_SESSION=true?


>
> Am So., 19. Sept. 2021 um 11:53 Uhr schrieb Mantas Mikulėnas
> <grawity at gmail.com>:
>> On Sun, Sep 19, 2021 at 4:05 AM Ed Greshko<ed.greshko at greshko.com>  wrote:
>>> Not a everyday systemd service writer....
>>>
>>> I've written a user service file to start an app on login.  It works well for Xorg with Environment=DISPLAY=:0.
>>>
>>> But I've found that under Wayland the DISPLAY=:1 after a logout of Xorg and login to a
>>> Wayland session.
>>>
>>> What would be the proper way to get the DISPLAY environment varible use it as opposed
>>> to "hard" coding it?
>>
>> The proper way is to have the desktop environment upload DISPLAY (and whatever else is relevant, such as XAUTHORITY or WAYLAND_DISPLAY or XDG_SESSION_TYPE) into systemd --user, so that it would be automatically available to your service without doing anything special.
>>
>> For example, gnome-session does this for GNOME (it calls systemd's UnsetAndSetEnvironment in gsm-util.c), and /etc/X11/xinit/xinitrc.d/50-systemd-user.sh handles the bare minimum for other Xorg-based desktops (when startx is used).
>>
>> If KDE integrates with systemd --user in any way (i.e. if it actually has a "plasma-core.target" that you mention), I'd really expect it to do the same before it tries to start its own targets, otherwise they would be kind of useless.
>>
>> --
>> Mantas Mikulėnas
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