Dear Maintainer,

Could it be possible by improving the .service file to not start its service
when the graphical session is not a sway/wlroots based one?

It would avoid to have multiple messages like the following:
déc. 27 14:40:08 kos-moceratops systemd[2258]: waybar.service: Scheduled
restart job, restart counter is at 4.
déc. 27 14:40:08 kos-moceratops systemd[2258]: Stopped Highly customizable
Wayland bar for Sway and Wlroots based compositors..
déc. 27 14:40:08 kos-moceratops systemd[2258]: Started Highly customizable
Wayland bar for Sway and Wlroots based compositors..
déc. 27 14:40:08 kos-moceratops waybar[3656]: [2022-12-27 14:40:08.898] [info]
Using configuration file /etc/xdg/waybar/config
déc. 27 14:40:08 kos-moceratops waybar[3656]: [2022-12-27 14:40:08.898] [info]
Using CSS file /etc/xdg/waybar/style.css
déc. 27 14:40:08 kos-moceratops waybar[3656]: [2022-12-27 14:40:08.903] [error]
Failed to acquire required resources.
déc. 27 14:40:08 kos-moceratops systemd[2258]: waybar.service: Main process
exited, code=exited, status=1/FAILURE
déc. 27 14:40:08 kos-moceratops systemd[2258]: waybar.service: Failed with
result 'exit-code'.
déc. 27 14:40:09 kos-moceratops systemd[2258]: waybar.service: Scheduled
restart job, restart counter is at 5.
déc. 27 14:40:09 kos-moceratops systemd[2258]: Stopped Highly customizable
Wayland bar for Sway and Wlroots based compositors..
déc. 27 14:40:09 kos-moceratops systemd[2258]: waybar.service: Start request
repeated too quickly.
déc. 27 14:40:09 kos-moceratops systemd[2258]: waybar.service: Failed with
result 'exit-code'.
déc. 27 14:40:09 kos-moceratops systemd[2258]: Failed to start Highly
customizable Wayland bar for Sway and Wlroots based compositors..

And so 'systemctl --user status' reports 'State: degraded' probably due to
that.

I know that I can mask it in my own graphical session (GNOME).

Lastly, I don't know if this could be possible because I did not check how
other desktop session .service files
deal to avoid such cross-desktop "pollution". Or if it's really useful.

Regards,
Patrice

Hi,

I asked in the wlroots IRC channel and got the information that it is
not possible to find out if a program is starting in a wlroots based
compositor. I thought maybe an environment variable that usable with
systemd's `ConditionEnvironment` could exist, but apparently thats not
the case.
But I'm open to suggestions how to fix that.

cheers,
Birger

Hi,

The error is triggered by

```
 wl_display_roundtrip(wl_display);
  if (layer_shell == nullptr || xdg_output_manager == nullptr) {
    throw std::runtime_error("Failed to acquire required resources.");
  }
```

so

    weston-info 2>/dev/null | grep -E "interface: 'zwlr_layer_shell"

should get you pretty close. This will break once waybar switches to
ext-layer-shell so maybe

    weston-info 2>/dev/null | grep -E "interface: 'z(wlr|ext)_layer_shell"

works better.

Cheers,
 -- Guido

Hi,
[...]

Ah, thats nice! I also thought of simply writing a
`am_i_in_a_wlroots_compositor` program, but I fail to find out how I
would use that in a systemd service file so that the service does not
try to restart if the condition is not met.

cheers,
Birger

Hi,

Is there nothing to propose in the line of freedesktop.org?
(based for instance on any XDG_CURRENT_DESKTOP or DESKTOP_SESSION envvar)
I am not aware about how weston/sway based desktops are currently
integrated with the others (GNOME, KDE, etc).
Does-it exist a Debian team that would coordinate and may have
suggestions / recommendations for that?

Note also that using sid:
$ weston-info

*** Please use wayland-info instead
*** weston-info is deprecated and will be removed in a future version
<cut>

And I think that wayland-info is part of wayland-utils(1) that is not
yet packaged, isn't it?

Many thanks,
Patrice

(1) https://wayland.freedesktop.org/releases.html

Le lun. 2 janv. 2023 à 15:14, Birger Schacht <birger@debian.org> a écrit :

Note that in Trixie/Sid, `weston-info` is no longer available as it has been
removed from the `weston` package.
The `wayland-utils` package with the `wayland-info` package is available since
Bookworm (looks like they were just in time).