source: udev/35-helper.rules@ 44ef9b9a

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#
# Description : 35-helper.rules
#
# Authors     : Based on Open Suse Udev Rules
#               kay.sievers@suse.de
#
# Adapted to  : Jim Gifford
# LFS         : Alexander E. Patrakov
#
# Version     : 00.01
#
# Notes       :
#
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# kernel firmware loader
SUBSYSTEM=="firmware",  ACTION=="add", RUN+="firmware_helper"

# check cdrom helper
BUS=="ide",     KERNEL=="hd[a-z]", ACTION=="add", IMPORT="/sbin/cdrom_id --export $tempnode"
BUS=="scsi",    KERNEL=="sr[0-9]*", ACTION=="add", IMPORT="/sbin/cdrom_id --export $tempnode"
BUS=="scsi",    KERNEL="scd[a-z]", ACTION=="add", IMPORT="/sbin/cdrom_id --export $tempnode"
BUS=="scsi",    KERNEL=="sg[0-9]*", ACTION=="add", DRIVER=="sr", GROUP="cdrom"

ENV{ID_CDROM}=="?*",            SYMLINK+="cdrom%m", GROUP="cdrom"
ENV{ID_CDROM_CD_R}=="?*",       SYMLINK+="cdr%m"
ENV{ID_CDROM_CD_RW}=="?*",      SYMLINK+="cdrw%m"
ENV{ID_CDROM_DVD}=="?*",        SYMLINK+="dvd%m"
ENV{ID_CDROM_DVD_R}=="?*",      SYMLINK+="dvdrw%m"

# Run network stuff when the network device is loaded
ACTION=="add", SUBSYSTEM=="net", ENV{INTERFACE}=="*", RUN+="network_helper.sh"
ACTION=="remove", SUBSYSTEM=="net", ENV{INTERFACE}=="*", RUN+="network_helper.sh"

# adds floppy devices
KERNEL=="fd[0-9]*", ACTION=="add", SYSFS{cmos}=="*", RUN+="create_floppy_devices -c -t $sysfs{cmos} -m %M /dev/%k"t