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2a6ba61264
There is a race between logind applying ACLs to allow the active session of a locally present user access to devices with a udev uaccess tag (like /dev/video# nodes) getting applied vs wireplumber/pipewire starting. Wireplumber/pipewire are part of the (user) default.target, which gets started as soon as a user logs in and systemd --user is started for that user, where as logind only starts applying the ACLs after the gnome-shell associated logind session has been created. This race may cause pipewire to not see v4l2 video sources at login, this can be reproduced with these steps: 1. sudo setfacl --remove-all /dev/video* 2. systemctl --user restart pipewire 3. Now wp-ctl status will not show any video devices (like if pipewire was started before the udev uaccess ACLs got applied) 4. Do a switch to another (test) user without logging out, e.g. in GNOME go to the top right system menu press the power on/off icon and select "Switch User..." 5. Switch back to your normal user. Run getfacl /dev/video0 this will show your user has access now. 6. wp-ctl status should show the camera now, but it does not. Fix pipewire not seeing v4l2 sources in this case by making v4l2-udev monitor systemd-logind session changes and redoing the access() checks on /dev/video# nodes when the session changes. Closes: #3539 Closes: #3960 Signed-off-by: Hans de Goede <hdegoede@redhat.com> |
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