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SYSTEMD.DEVICE(5)		systemd.device		     SYSTEMD.DEVICE(5)

NAME
       systemd.device - systemd device configuration files

SYNOPSIS
       systemd.device

DESCRIPTION
       A unit configuration file whose name ends in .device encodes
       information about a device unit as exposed in the sysfs/udev(7) device
       tree.

       This unit type has no specific options. See systemd.unit(5) for the
       common options of all unit configuration files. The common
       configuration items are configured in the generic [Unit] and [Install]
       sections. A separate [Device] section does not exist, since no
       device-specific options may be configured.

       systemd will automatically create dynamic device units for all kernel
       devices that are marked with the "systemd" udev tag (by default all
       block and network devices, and a few others). This may be used to
       define dependencies between devices and other units.

       Device units are named after the /sys and /dev paths they control.
       Example: the device /dev/sda5 is exposed in systemd as dev-sda5.device.
       For details about the escaping logic used to convert a file system path
       to a unit name see systemd.unit(5).

THE UDEV DATABASE
       The settings of device units may either be configured via unit files,
       or directly from the udev database (which is recommended). The
       following udev properties are understood by systemd:

       SYSTEMD_WANTS=
	   Adds dependencies of type Wants from this unit to all listed units.
	   This may be used to activate arbitrary units, when a specific
	   device becomes available. Note that this and the other tags are not
	   taken into account unless the device is tagged with the "systemd"
	   string in the udev database, because otherwise the device is not
	   exposed as systemd unit.

       SYSTEMD_ALIAS=
	   Adds an additional alias name to the device unit. This must be an
	   absolute path that is automatically transformed into a unit name.
	   (See above.)

       SYSTEMD_READY=
	   If set to 0 systemd will consider this device unplugged even if it
	   shows up in the udev tree. If this property is unset or set to 1
	   the device will be considered plugged the moment it shows up in the
	   udev tree. This property has no influence on the behaviour when a
	   device disappears from the udev tree. This option is useful to
	   support devices that initially show up in an uninitialized state in
	   the tree, and for which a changed event is generated the moment
	   they are fully set up.

       ID_MODEL_FROM_DATABASE=, ID_MODEL=
	   If set, this property is used as description string for the device
	   unit.

SEE ALSO
       systemd(1), systemctl(8), systemd.unit(5), udev(7)

AUTHOR
       Lennart Poettering <lennart@poettering.net>
	   Developer

systemd				  03/16/2012		     SYSTEMD.DEVICE(5)

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