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5430f7f2bc
We finally got the OK from all contributors with non-trivial commits to relicense systemd from GPL2+ to LGPL2.1+. Some udev bits continue to be GPL2+ for now, but we are looking into relicensing them too, to allow free copy/paste of all code within systemd. The bits that used to be MIT continue to be MIT. The big benefit of the relicensing is that closed source code may now link against libsystemd-login.so and friends.
169 lines
7.8 KiB
XML
169 lines
7.8 KiB
XML
<?xml version='1.0'?> <!--*-nxml-*-->
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<?xml-stylesheet type="text/xsl" href="http://docbook.sourceforge.net/release/xsl/current/xhtml/docbook.xsl"?>
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<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN"
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"http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
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<!--
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This file is part of systemd.
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Copyright 2010 Lennart Poettering
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systemd is free software; you can redistribute it and/or modify it
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under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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systemd is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with systemd; If not, see <http://www.gnu.org/licenses/>.
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-->
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<refentry id="systemd.device">
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<refentryinfo>
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<title>systemd.device</title>
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<productname>systemd</productname>
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<authorgroup>
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<author>
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<contrib>Developer</contrib>
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<firstname>Lennart</firstname>
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<surname>Poettering</surname>
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<email>lennart@poettering.net</email>
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</author>
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</authorgroup>
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</refentryinfo>
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<refmeta>
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<refentrytitle>systemd.device</refentrytitle>
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<manvolnum>5</manvolnum>
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</refmeta>
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<refnamediv>
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<refname>systemd.device</refname>
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<refpurpose>systemd device configuration files</refpurpose>
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</refnamediv>
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<refsynopsisdiv>
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<para><filename>systemd.device</filename></para>
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</refsynopsisdiv>
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<refsect1>
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<title>Description</title>
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<para>A unit configuration file whose name ends in
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<filename>.device</filename> encodes information about
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a device unit as exposed in the
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sysfs/<citerefentry><refentrytitle>udev</refentrytitle><manvolnum>7</manvolnum></citerefentry>
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device tree.</para>
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<para>This unit type has no specific options. See
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<citerefentry><refentrytitle>systemd.unit</refentrytitle><manvolnum>5</manvolnum></citerefentry>
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for the common options of all unit configuration
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files. The common configuration items are configured
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in the generic <literal>[Unit]</literal> and
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<literal>[Install]</literal> sections. A separate
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<literal>[Device]</literal> section does not exist,
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since no device-specific options may be
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configured.</para>
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<para>systemd will automatically create dynamic device
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units for all kernel devices that are marked with the
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"systemd" udev tag (by default all block and network
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devices, and a few others). This may be used to define
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dependencies between devices and other
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units.</para>
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<para>Device units are named after the
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<filename>/sys</filename> and
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<filename>/dev</filename> paths they control. Example:
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the device <filename>/dev/sda5</filename> is exposed
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in systemd as <filename>dev-sda5.device</filename>. For
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details about the escaping logic used to convert a
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file system path to a unit name see
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<citerefentry><refentrytitle>systemd.unit</refentrytitle><manvolnum>5</manvolnum></citerefentry>.</para>
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</refsect1>
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<refsect1>
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<title>The udev Database</title>
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<para>The settings of device units may either be
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configured via unit files, or directly from the udev
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database (which is recommended). The following udev
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properties are understood by systemd:</para>
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<variablelist>
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<varlistentry>
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<term><varname>SYSTEMD_WANTS=</varname></term>
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<listitem><para>Adds dependencies of
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type <varname>Wants</varname> from
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this unit to all listed units. This
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may be used to activate arbitrary
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units, when a specific device becomes
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available. Note that this and the
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other tags are not taken into account
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unless the device is tagged with the
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"<literal>systemd</literal>" string in
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the udev database, because otherwise
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the device is not exposed as systemd
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unit.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><varname>SYSTEMD_ALIAS=</varname></term>
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<listitem><para>Adds an additional
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alias name to the device unit. This
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must be an absolute path that is
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automatically transformed into a unit
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name. (See above.)</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><varname>SYSTEMD_READY=</varname></term>
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<listitem><para>If set to 0 systemd
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will consider this device unplugged
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even if it shows up in the udev
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tree. If this property is unset or set
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to 1 the device will be considered
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plugged the moment it shows up in the
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udev tree. This property has no
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influence on the behaviour when a
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device disappears from the udev
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tree. This option is useful to support
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devices that initially show up in an
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uninitialized state in the tree, and for
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which a changed event is generated the
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moment they are fully set
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up.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><varname>ID_MODEL_FROM_DATABASE=</varname></term>
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<term><varname>ID_MODEL=</varname></term>
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<listitem><para>If set, this property is
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used as description string for the
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device unit.</para></listitem>
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</varlistentry>
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</variablelist>
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</refsect1>
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<refsect1>
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<title>See Also</title>
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<para>
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<citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>systemctl</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>systemd.unit</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>udev</refentrytitle><manvolnum>7</manvolnum></citerefentry>
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</para>
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</refsect1>
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</refentry>
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