tinyramfs/files/mdev.conf

# Copyright (c) 2012-2019, Piotr Karbowski <piotr.karbowski@gmail.com>
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without modification, are
# permitted provided that the following conditions are met:
#
#    * Redistributions of source code must retain the above copyright notice, this list
#      of conditions and the following disclaimer.
#    * Redistributions in binary form must reproduce the above copyright notice, this list
#      of conditions and the following disclaimer in the documentation and/or other
#      materials provided with the distribution.
#    * Neither the name of the Piotr Karbowski nor the names of its contributors may be
#      used to endorse or promote products derived from this software without specific
#      prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY
# EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
# MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
# THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
# OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE US
# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

# mdev-like-a-boss

# Syntax:
# [-]devicename_regex user:group mode [=path]|[>path]|[!] [@|$|*cmd args...]
# [-]$ENVVAR=regex    user:group mode [=path]|[>path]|[!] [@|$|*cmd args...]
# [-]@maj,min[-min2]  user:group mode [=path]|[>path]|[!] [@|$|*cmd args...]
#
# [-]: do not stop on this match, continue reading mdev.conf
# =: move, >: move and create a symlink
# !: do not create device node
# @|$|*: run cmd if $ACTION=remove, @cmd if $ACTION=add, *cmd in all cases

# support module loading on hotplug
$MODALIAS=.*    0:0 660 @modprobe -b "$MODALIAS"

# null may already exist; therefore ownership has to be changed with command
null        0:0 666 @chmod 666 $MDEV
zero        0:0 666
full        0:0 666
random      0:0 444
urandom     0:0 444
hwrandom    0:0 444
grsec       0:0 660
kmem        0:0 640
mem         0:0 640
port        0:0 640
# console may already exist; therefore ownership has to be changed with command
console     0:5 600 @chmod 600 $MDEV
ptmx        0:5 666
pty.*       0:5 660

# typical devices
tty         0:5 666
tty[0-9]*   0:5 660
vcsa*[0-9]* 0:5 660
ttyS[0-9]*  0:14 660

# block devices
ram([0-9]*)        0:9 660 >rd/%1
loop([0-9]+)       0:9 660 >loop/%1
sr[0-9]*           0:16 660 @ln -sf $MDEV cdrom
fd[0-9]*           0:8 660
SUBSYSTEM=block;.* 0:9 660 */lib/mdev/storage-device

# raid controllers
cciss!(.*)  0:9 660 =cciss/%1
ida!(.*)    0:9 660 =ida/%1
rd!(.*)     0:9 660 =rd/%1

# graphics
card[0-9]   0:13 660 =dri/
agpgart     0:0 660 >misc/
psaux       0:0 660 >misc/
rtc         0:0 664 >misc/

# input stuff
SUBSYSTEM=input;.* 0:25 660

# drm etc
dri/.*      0:13 660

# don't create old usbdev* devices.
usbdev[0-9].[0-9]* 0:0 660 !

# stop creating x:x:x:x which looks like /dev/dm-*
[0-9]+\:[0-9]+\:[0-9]+\:[0-9]+ 0:0 660 !

# /dev/cpu support.
microcode       0:0 600 =cpu/
cpu([0-9]+)     0:0 600 =cpu/%1/cpuid
msr([0-9]+)     0:0 600 =cpu/%1/msr