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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>
(cherry picked from commit
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