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V10lator
Apprentice
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Joined: 11 Jul 2004
Posts: 207

PostPosted: Thu Feb 21, 2013 7:54 am    Post subject: Wrong device permissions Reply with quote

First let me tell you a bit so you better understand the problem:
Some time ago I changed from openRC to systemD. Before you ask: No, I won't change back.
Now I got a new gamepad, connected it and... experienced wrong permissions of device nodes. According to this thread I have to be in the uinput group, but that's wrong/outdated, the device is made for root:root with 600:
Code:
$ ls -l /dev/uinput
crw------- 1 root root 10, 223 21. Feb 08:23 /dev/uinput

Looking at udev rules it should be 640:
Code:
$ grep uinput /lib/udev/rules.d/*
/lib/udev/rules.d/50-udev-default.rules:SUBSYSTEM=="input", KERNEL=="ts[0-9]*|uinput", MODE="0640"

But this is still wrong, I have to change it to 666 to be able to run xboxdrv as a regular user (being in the uinput group). Of course I have to do this after every reboot.

If you think that's all you are wrong. After starting xboxdrv I need to change two more permissions before I can use the device: /dev/input/event6 (for force-feedback) and /dev/input/js0:
Code:
$ ls -l /dev/input/event6 /dev/input/js0
crw-r----- 1 root root 13, 70 21. Feb 08:44 /dev/input/event6
crw-r--r-- 1 root root 13,  0 21. Feb 08:44 /dev/input/js0

At least they are what udev rules tell they should be:
Code:
$ grep event /lib/udev/rules.d/* | grep MODE
/lib/udev/rules.d/50-udev-default.rules:SUBSYSTEM=="input", KERNEL=="mouse*|mice|event*", MODE="0640"
$ grep js /lib/udev/rules.d/* | grep MODE
/lib/udev/rules.d/50-udev-default.rules:SUBSYSTEM=="input", KERNEL=="js[0-9]*", MODE="0644"


Now I wonder if the problem is in udev, ConsoleKit or systemD. Please help.
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ulenrich
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Joined: 10 Oct 2010
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PostPosted: Thu Feb 21, 2013 1:43 pm    Post subject: Re: Wrong device permissions Reply with quote

V10lator wrote:
I have to do this after every reboot.
Why don't you

cp /lib/udev/rules.d/50-udev-default.rules /etc/udev/rules.d/50-udev-default.rules
edit /etc/udev/rules.d/50-udev-default.rules

You own rules file at /etc/udev/rules.d should over rule the distribution rules file as long as it has the exact same name. That is what /etc is about: Its your root-administrator playground.
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V10lator
Apprentice
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Joined: 11 Jul 2004
Posts: 207

PostPosted: Thu Feb 21, 2013 1:50 pm    Post subject: Reply with quote

And what exactly to change there when it seems to get ignored anyway?

//EDIT: Just to confirm that it's ignored I did what you told and changed the input handling:
Code:
# input
SUBSYSTEM=="input", ENV{ID_INPUT}=="", IMPORT{builtin}="input_id"
SUBSYSTEM=="input", KERNEL=="mouse*|mice", MODE="0640"
SUBSYSTEM=="input", KERNEL=="event*", MODE="0666"
SUBSYSTEM=="input", KERNEL=="ts[0-9]*|uinput", GROUP="uinput", MODE="0660"
SUBSYSTEM=="input", KERNEL=="js[0-9]*", MODE="0666"

Curiously the uinput change is ignored:
Code:
$ ls -l /dev/uinput
crw------- 1 root root 10, 223 21. Feb 14:57 /dev/uinput

While the event/js change seems to work:
Code:
$ ls -l /dev/input/event6 /dev/input/js0
crw-rw-rw- 1 root root 13, 70 21. Feb 15:00 /dev/input/event6
crw-rw-rw- 1 root root 13,  0 21. Feb 15:00 /dev/input/js0


Last edited by V10lator on Thu Feb 21, 2013 2:01 pm; edited 1 time in total
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PaulBredbury
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Joined: 14 Jul 2005
Posts: 7310

PostPosted: Thu Feb 21, 2013 1:59 pm    Post subject: Reply with quote

So create a udev rule that works. Google "udev debugging".

To get you started:
Code:
udevadm info -a --name /dev/uinput
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V10lator
Apprentice
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Joined: 11 Jul 2004
Posts: 207

PostPosted: Thu Feb 21, 2013 2:06 pm    Post subject: Reply with quote

PaulBredbury wrote:
To get you started:
Code:
udevadm info -a --name /dev/uinput

Thanks a lot! /dev/uinput is a subsystem of misc, not input. That fixed it! :D

I guess this is a bug, but is it a gentoo or upstream bug? Also I'm curious if there are better solutions available and/or if the whole thing is a bug (a joystick should work out of the box, shouldn't it?).
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ulenrich
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PostPosted: Fri Feb 22, 2013 2:04 pm    Post subject: Reply with quote

If you get help you are supposed to help:
https://bugs.gentoo.org

... if you have reason to think you have found a bug.
Developers are not that often gamers. Joysticks might have been forgotten at some point ...
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V10lator
Apprentice
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Joined: 11 Jul 2004
Posts: 207

PostPosted: Fri Feb 22, 2013 2:18 pm    Post subject: Reply with quote

ulenrich wrote:
If you get help you are supposed to help

Sure, but I don't want to annoy gentoo devs with upstream bugs, that's why I asked if anybody knows if this is a gentoo or a upstream bug. :)
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