[gentoo-dev] How is group "usb" used in your system, if at all?

[gentoo-dev] How is group "usb" used in your system, if at all?

[Samuli Suominen]

I'm trying to find a reason to keep this line...

SUBSYSTEM=="usb", ENV{DEVTYPE}=="usb_device", GROUP="usb"

in /lib/udev/rules.d/40-gentoo.rules we have inherited from older udev, 
going back some time now

# find /dev -group usb -exec ls -l {} +

results nothing on every system tested

and the original /lib/udev/rules.d/50-udev-default.rules from 
udev-197/198 has:

SUBSYSTEM=="usb", ENV{DEVTYPE}=="usb_device", MODE="0664"

which seems to be what we want?

I can remember one or two ebuilds making use of group usb, but they have 
their own udev rules that makes them to do that, and are not dependant 
on these rules

Re: [gentoo-dev] How is group "usb" used in your system, if at all?

[Samuli Suominen]

On 16/03/13 14:39, Samuli Suominen wrote:
> I'm trying to find a reason to keep this line...
>
> SUBSYSTEM=="usb", ENV{DEVTYPE}=="usb_device", GROUP="usb"
>
> in /lib/udev/rules.d/40-gentoo.rules we have inherited from older udev,
> going back some time now
>
> # find /dev -group usb -exec ls -l {} +
>
> results nothing on every system tested
>
> and the original /lib/udev/rules.d/50-udev-default.rules from
> udev-197/198 has:
>
> SUBSYSTEM=="usb", ENV{DEVTYPE}=="usb_device", MODE="0664"
>
> which seems to be what we want?
>
> I can remember one or two ebuilds making use of group usb, but they have
> their own udev rules that makes them to do that, and are not dependant
> on these rules
>
>

Got it. Unless you have something else totally different to list here, 
nevermind.

crw-rw-r-- 1 root usb 189,   0 Mar 14 14:14 ./bus/usb/001/001
crw-rw-r-- 1 root usb 189,   1 Mar 14 14:14 ./bus/usb/001/002
crw-rw-r-- 1 root usb 189,   2 Mar 14 14:14 ./bus/usb/001/003
crw-rw-r-- 1 root usb 189, 128 Mar 14 14:14 ./bus/usb/002/001
crw-rw-r-- 1 root usb 189, 129 Mar 14 14:14 ./bus/usb/002/002
crw-rw-r-- 1 root usb 189, 130 Mar 14 14:14 ./bus/usb/002/003
crw-rw-r-- 1 root usb 189, 132 Mar 14 12:15 ./bus/usb/002/005
crw-rw-r-- 1 root usb 189, 256 Mar 14 14:14 ./bus/usb/003/001
crw-rw-r-- 1 root usb 189, 384 Mar 14 14:14 ./bus/usb/004/001

Re: [gentoo-dev] How is group "usb" used in your system, if at all?

[James Cloos]

>>>>> "SS" == Samuli Suominen <ssuominen@gentoo.org> writes:

SS> # find /dev -group usb -exec ls -l {} +
SS> results nothing on every system tested

:; find /dev -group usb -ls
  9303    0 crw-rw-r--   1 root     usb               Mar 15 23:13 /dev/bus/usb/009/001
  9300    0 crw-rw-r--   1 root     usb               Mar 15 23:13 /dev/bus/usb/008/001
  9297    0 crw-rw-r--   1 root     usb               Mar 15 23:13 /dev/bus/usb/007/001
  9294    0 crw-rw-r--   1 root     usb               Mar 15 23:13 /dev/bus/usb/006/001
  9291    0 crw-rw-r--   1 root     usb               Mar 15 23:13 /dev/bus/usb/005/001
  9043    0 crw-rw-r--   1 root     usb               Mar 15 23:13 /dev/bus/usb/004/006
   108    0 crw-rw-r--   1 root     usb               Mar 15 23:13 /dev/bus/usb/004/005
  9038    0 crw-rw-r--   1 root     usb               Mar  5 11:24 /dev/bus/usb/004/003
  9034    0 crw-rw-r--   1 root     usb               Mar 15 23:13 /dev/bus/usb/004/002
  9288    0 crw-rw-r--   1 root     usb               Mar 15 23:13 /dev/bus/usb/004/001
  9285    0 crw-rw-r--   1 root     usb               Mar 15 23:13 /dev/bus/usb/003/001
  9033    0 crw-rw-r--   1 root     usb               Mar 15 23:13 /dev/bus/usb/002/002
  9282    0 crw-rw-r--   1 root     usb               Mar 15 23:13 /dev/bus/usb/002/001
  9279    0 crw-rw-r--   1 root     usb               Mar 15 23:13 /dev/bus/usb/001/001

I also noticed that vdr added itself to that group.

:; egrep ^vdr /etc/passwd
vdr:x:113:1013:added by portage for gentoo-vdr-scripts:/var/vdr:/bin/bash

-JimC
-- 
James Cloos <cloos@jhcloos.com>         OpenPGP: 1024D/ED7DAEA6

Re: [gentoo-dev] How is group "usb" used in your system, if at all?

[Samuli Suominen]

On 16/03/13 19:56, James Cloos wrote:
>>>>>> "SS" == Samuli Suominen <ssuominen@gentoo.org> writes:
>
> SS> # find /dev -group usb -exec ls -l {} +
> SS> results nothing on every system tested
>
> :; find /dev -group usb -ls
>    9303    0 crw-rw-r--   1 root     usb               Mar 15 23:13 /dev/bus/usb/009/001
>    9300    0 crw-rw-r--   1 root     usb               Mar 15 23:13 /dev/bus/usb/008/001
>    9297    0 crw-rw-r--   1 root     usb               Mar 15 23:13 /dev/bus/usb/007/001
>    9294    0 crw-rw-r--   1 root     usb               Mar 15 23:13 /dev/bus/usb/006/001
>    9291    0 crw-rw-r--   1 root     usb               Mar 15 23:13 /dev/bus/usb/005/001
>    9043    0 crw-rw-r--   1 root     usb               Mar 15 23:13 /dev/bus/usb/004/006
>     108    0 crw-rw-r--   1 root     usb               Mar 15 23:13 /dev/bus/usb/004/005
>    9038    0 crw-rw-r--   1 root     usb               Mar  5 11:24 /dev/bus/usb/004/003
>    9034    0 crw-rw-r--   1 root     usb               Mar 15 23:13 /dev/bus/usb/004/002
>    9288    0 crw-rw-r--   1 root     usb               Mar 15 23:13 /dev/bus/usb/004/001
>    9285    0 crw-rw-r--   1 root     usb               Mar 15 23:13 /dev/bus/usb/003/001
>    9033    0 crw-rw-r--   1 root     usb               Mar 15 23:13 /dev/bus/usb/002/002
>    9282    0 crw-rw-r--   1 root     usb               Mar 15 23:13 /dev/bus/usb/002/001
>    9279    0 crw-rw-r--   1 root     usb               Mar 15 23:13 /dev/bus/usb/001/001
>
> I also noticed that vdr added itself to that group.
>
> :; egrep ^vdr /etc/passwd
> vdr:x:113:1013:added by portage for gentoo-vdr-scripts:/var/vdr:/bin/bash

Intresting.

I wonder how safe can that be for vdr to have read & write access to 
every USB device?