systemd/etc/udev/debian/hotplug.rules

ACTION!="add", GOTO="hotplug_not_add_event"

# check if the device has already been claimed by a driver
ENV{PHYSDEVDRIVER}=="?*", SUBSYSTEM!="input", GOTO="hotplug_driver_loaded"

# load the drivers
ENV{MODALIAS}=="?*",	RUN+="/sbin/modprobe $env{MODALIAS}"
SUBSYSTEM=="ide",	ENV{MODALIAS}!="?*",	RUN+="ide.agent"

SUBSYSTEM=="pnp",	ENV{MODALIAS}!="?*",	RUN+="/bin/sh -c 'while read id; do /sbin/modprobe pnp:d$$id; done < /sys$devpath/id'"

SUBSYSTEM=="pcmcia_socket",			RUN+="/sbin/modprobe pcmcia"

# rules for subsystems which lack proper hotplug support
SUBSYSTEM=="i2o",				RUN+="/sbin/modprobe i2o-block"
#SUBSYSTEM=="mmc",				RUN+="/sbin/modprobe mmc-block"

SUBSYSTEM=="scsi_device", ATTRS{type}=="0|7|14", RUN+="/sbin/modprobe sd_mod"
SUBSYSTEM=="scsi_device", ATTRS{type}=="1",	RUN+="/sbin/modprobe osst", \
	ATTRS{vendor}=="Onstream", ATTRS{model}!="ADR*"
SUBSYSTEM=="scsi_device", ATTRS{type}=="1",	RUN+="/sbin/modprobe st", \
	ATTRS{vendor}=="Onstream", ATTRS{model}=="ADR*"
SUBSYSTEM=="scsi_device", ATTRS{type}=="1",	RUN+="/sbin/modprobe st", \
	ATTRS{vendor}!="Onstream"
SUBSYSTEM=="scsi_device", ATTRS{type}=="[45]",	RUN+="/sbin/modprobe sr_mod"
SUBSYSTEM=="scsi_device", ATTRS{type}=="[235689]", RUN+="/sbin/modprobe sg"

SUBSYSTEM=="ide", ATTRS{media}=="tape",		RUN+="/sbin/modprobe ide-scsi"

# From here on follows the hotplug agents which do not load modules
LABEL="hotplug_driver_loaded"

# FIXME: does a sane default exist?
#SUBSYSTEM=="scsi_device", ATTRS{idVendor}=="...", \
#	RUN+="scsi-re-add"

SUBSYSTEM=="firmware",		RUN+="firmware.agent"

LABEL="hotplug_not_add_event"

SUBSYSTEM=="net",		RUN+="/bin/sh -c '/lib/udev/net.agent &'"

# Log every event to /dev/hotplug.log (for debugging).
#RUN+="logger.agent"