Dear Andrei, dear Lennart,
Thank you very much for your answers.
Am 31.03.20 um 17:09 schrieb Lennart Poettering:
On Do, 19.03.20 20:24, Andrei Borzenkov (arvidjaar@xxxxxxxxx) wrote:
19.03.2020 19:47, Paul Menzel пишет:
I am using Debian Sid/unstable with systemd 245.2 and Weston 8.0.0.
I amtrying to start a graphical desktop as soon as possible. Currently,
I use Weston, but unfortunately accessing `/dev/dri/card0` it gets a
permission denied error. The Weston service unit is ordered after
`systemd-logind.service`.
Weston now fails to start, because it gets a permission denied error
accessing `/dev/dri/card0` [1][2].
drmModeSetCrtc(backend->drm.fd, output->crtc_id,
scanout_state->fb->fb_id, 0, 0, connectors, n_conn, &mode->mode_info);
Right before Weston starts, the permission and ownership are like below.
$ ls -l /dev/dri:
insgesamt 0
crw------- 1 root root 226, 0 Mär 19 17:29 card0
crw------- 1 root root 226, 128 Mär 19 17:29 renderD128
After udev applied the rules, it looks like below, meaning users in
group `video` are allowed to access the device.
$ ls -l /dev/dri
insgesamt 0
drwxr-xr-x 2 root root 80 Mär 19 17:29 by-path
crw-rw----+ 1 root video 226, 0 Mär 19 17:29 card0
crw-rw----+ 1 root render 226, 128 Mär 19 17:29 renderD128
Is there a way to order a service in such a way, that it’s guaranteed
that udev rules to devices were applied?
After=device should work. udev announces device after all rules have
been processed.
After= only orders, but this doesn't pull the device unit into the job
queue. To do that, you need to add Wants= on the device unit as well.
Trying this,
After=dev-dri-card0.device
Wants=dev-dri-card0.device
the service times out waiting for the device.
$ journalctl -a
[…]
Apr 01 14:15:42.672430 kodi systemd[1]: Reached target Multi-User
System.
[…]
Apr 01 14:17:09.805001 kodi systemd[1]: dev-dri-card0.device: Job
dev-dri-card0.device/start timed out.
Apr 01 14:17:09.805839 kodi systemd[1]: Timed out waiting for
device /dev/dri/card0.
Apr 01 14:17:09.806464 kodi systemd[1]: dev-dri-card0.device: Job
dev-dri-card0.device/start failed with result 'timeout'.
Apr 01 14:17:09.809847 kodi systemd[1]: Starting Weston, a Wayland
compositor, as a system service...
[…]
$ ls -l /dev/dri/card0
crw-rw---- 1 root video 226, 0 Apr 1 14:15 /dev/dri/card0
Kind regards,
Paul
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