Copyright 2010 Lennart Poettering
systemd is free software; you can redistribute it and/or modify it
- under the terms of the GNU General Public License as published by
- the Free Software Foundation; either version 2 of the License, or
+ under the terms of the GNU Lesser General Public License as published by
+ the Free Software Foundation; either version 2.1 of the License, or
(at your option) any later version.
systemd is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- General Public License for more details.
+ Lesser General Public License for more details.
- You should have received a copy of the GNU General Public License
+ You should have received a copy of the GNU Lesser General Public License
along with systemd; If not, see <http://www.gnu.org/licenses/>.
-->
<refnamediv>
<refname>systemd.device</refname>
- <refpurpose>systemd device configuration files</refpurpose>
+ <refpurpose>Device unit configuration</refpurpose>
</refnamediv>
<refsynopsisdiv>
- <para><filename>systemd.device</filename></para>
+ <para><filename><replaceable>device</replaceable>.device</filename></para>
</refsynopsisdiv>
<refsect1>
<title>Description</title>
<para>A unit configuration file whose name ends in
- <filename>.device</filename> encodes information about
+ <literal>.device</literal> encodes information about
a device unit as exposed in the
sysfs/<citerefentry><refentrytitle>udev</refentrytitle><manvolnum>7</manvolnum></citerefentry>
device tree.</para>
<citerefentry><refentrytitle>systemd.unit</refentrytitle><manvolnum>5</manvolnum></citerefentry>
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.</para>
+ in the generic <literal>[Unit]</literal> and
+ <literal>[Install]</literal> sections. A separate
+ <literal>[Device]</literal> section does not exist,
+ since no device-specific options may be
+ configured.</para>
<para>systemd will automatically create dynamic device
units for all kernel devices that are marked with the
<para>Device units are named after the
<filename>/sys</filename> and
<filename>/dev</filename> paths they control. Example:
- the device <filename>/dev/sda5</filename> is exposed
+ the device <filename noindex='true'>/dev/sda5</filename> is exposed
in systemd as <filename>dev-sda5.device</filename>. For
details about the escaping logic used to convert a
file system path to a unit name see
database (which is recommended). The following udev
properties are understood by systemd:</para>
- <variablelist>
+ <variablelist class='udev-directives'>
<varlistentry>
<term><varname>SYSTEMD_WANTS=</varname></term>
<listitem><para>Adds dependencies of
type <varname>Wants</varname> from
this unit to all listed units. This
- may be used to activate arbitrary units,
- when a specific device becomes
- available.</para></listitem>
+ 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
+ <literal>systemd</literal> string in
+ the udev database, because otherwise
+ the device is not exposed as systemd
+ unit.</para></listitem>
</varlistentry>
<varlistentry>
name. (See above.)</para></listitem>
</varlistentry>
+ <varlistentry>
+ <term><varname>SYSTEMD_READY=</varname></term>
+ <listitem><para>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 behavior 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.</para></listitem>
+ </varlistentry>
+
<varlistentry>
<term><varname>ID_MODEL_FROM_DATABASE=</varname></term>
<term><varname>ID_MODEL=</varname></term>
<refsect1>
<title>See Also</title>
<para>
- <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
+ <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
<citerefentry><refentrytitle>systemctl</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
<citerefentry><refentrytitle>systemd.unit</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
- <citerefentry><refentrytitle>udev</refentrytitle><manvolnum>7</manvolnum></citerefentry>
+ <citerefentry><refentrytitle>udev</refentrytitle><manvolnum>7</manvolnum></citerefentry>,
+ <citerefentry><refentrytitle>systemd.directives</refentrytitle><manvolnum>7</manvolnum></citerefentry>
</para>
</refsect1>
~ianmdlvl / elogind.git / blobdiff