sources is provided by the library libudev.</para>
</refsect1>
- <refsect1><title>Configuration</title>
- <para>udev configuration files are placed in <filename>/etc/udev</filename>
- and <filename>/usr/lib/udev</filename>. All empty lines or lines beginning with
- '#' are ignored.</para>
-
- <refsect2><title>Configuration file</title>
- <para>udev expects its main configuration file at <filename>/etc/udev/udev.conf</filename>.
- It consists of a set of variables allowing the user to override default udev values.
- The following variables can be set:</para>
- <variablelist>
- <varlistentry>
- <term><option>udev_log</option></term>
- <listitem>
- <para>The logging priority. Valid values are the numerical syslog priorities
- or their textual representations: <option>err</option>, <option>info</option>
- and <option>debug</option>.</para>
- </listitem>
- </varlistentry>
- </variablelist>
- </refsect2>
-
- <refsect2><title>Rules files</title>
+ <refsect1><title>Rules files</title>
<para>The udev rules are read from the files located in the
system rules directory <filename>/usr/lib/udev/rules.d</filename>,
the volatile runtime directory <filename>/run/udev/rules.d</filename>
extensions are ignored.</para>
<para>Every line in the rules file contains at least one key-value pair.
+ Except for empty lines or lines beginning with '#', which are ignored.
There are two kinds of keys: match and assignment.
- If all match keys are matching against its value, the rule gets applied and the
- assignment keys get the specified value assigned.</para>
+ If all match keys match against their values, the rule gets applied and the
+ assignment keys get the specified values assigned.</para>
<para>A matching rule may rename a network interface, add symlinks
pointing to the device node, or run a specified program as part of
operators are:</para>
<variablelist>
<varlistentry>
- <term><option>==</option></term>
+ <term><literal>==</literal></term>
<listitem>
<para>Compare for equality.</para>
</listitem>
</varlistentry>
<varlistentry>
- <term><option>!=</option></term>
+ <term><literal>!=</literal></term>
<listitem>
<para>Compare for inequality.</para>
</listitem>
</varlistentry>
<varlistentry>
- <term><option>=</option></term>
+ <term><literal>=</literal></term>
<listitem>
<para>Assign a value to a key. Keys that represent a list are reset
and only this single value is assigned.</para>
</varlistentry>
<varlistentry>
- <term><option>+=</option></term>
+ <term><literal>+=</literal></term>
<listitem>
<para>Add the value to a key that holds a list of entries.</para>
</listitem>
</varlistentry>
<varlistentry>
- <term><option>:=</option></term>
+ <term><literal>:=</literal></term>
<listitem>
<para>Assign a value to a key finally; disallow any later changes.</para>
</listitem>
not only the device that has generated the event. If multiple keys that match
a parent device are specified in a single rule, all these keys must match at
one and the same parent device.</para>
- <variablelist>
+ <variablelist class='udev-directives'>
<varlistentry>
<term><option>ACTION</option></term>
<listitem>
pattern characters are supported:</para>
<variablelist>
<varlistentry>
- <term><option>*</option></term>
+ <term><literal>*</literal></term>
<listitem>
<para>Matches zero or more characters.</para>
</listitem>
</varlistentry>
<varlistentry>
- <term><option>?</option></term>
+ <term><literal>?</literal></term>
<listitem>
<para>Matches any single character.</para>
</listitem>
</varlistentry>
<varlistentry>
- <term><option>[]</option></term>
+ <term><literal>[]</literal></term>
<listitem>
<para>Matches any single character specified within the brackets. For
example, the pattern string 'tty[SR]' would match either 'ttyS' or 'ttyR'.
</variablelist>
<para>The following keys can get values assigned:</para>
- <variablelist>
+ <variablelist class='udev-directives'>
<varlistentry>
<term><option>NAME</option></term>
<listitem>
</varlistentry>
<varlistentry>
- <term><option>OWNER, GROUP, MODE</option></term>
+ <term><option>OWNER</option>, <option>GROUP</option>, <option>MODE</option></term>
<listitem>
<para>The permissions for the device node. Every specified value overrides
the compiled-in default value.</para>
</varlistentry>
<varlistentry>
- <term><option>RUN</option></term>
+ <term><option>RUN{<replaceable>type</replaceable>}</option></term>
<listitem>
<para>Add a program to the list of programs to be executed for a specific
- device.</para>
- <para>If no absolute path is given, the program is expected to live in
- /usr/lib/udev, otherwise the absolute path must be specified. The program
- name and following arguments are separated by spaces. Single quotes can
- be used to specify arguments with spaces.</para>
+ device, depending on <literal>type</literal>:</para>
+ <variablelist>
+ <varlistentry>
+ <term><literal>program</literal></term>
+ <listitem>
+ <para>Execute an external program specified as the assigned
+ value. If no absolute path is given, the program is expected to live in
+ /usr/lib/udev, otherwise the absolute path must be specified.</para>
+ <para>This is the default if no <replaceable>type</replaceable> is
+ specified.</para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term><literal>builtin</literal></term>
+ <listitem>
+ <para>As <option>program</option>, but use one of the built-in programs rather
+ than an external one.</para>
+ </listitem>
+ </varlistentry>
+ </variablelist>
+ <para>The program name and following arguments are separated by spaces.
+ Single quotes can be used to specify arguments with spaces.</para>
<para>This can only be used for very short-running foreground tasks. Running an
event process for a long period of time may block all further events for
this or a dependent device.</para>
<term><option>IMPORT{<replaceable>type</replaceable>}</option></term>
<listitem>
<para>Import a set of variables as device properties,
- depending on <replaceable>type</replaceable>:</para>
+ depending on <literal>type</literal>:</para>
<variablelist>
<varlistentry>
- <term><option>program</option></term>
+ <term><literal>program</literal></term>
<listitem>
<para>Execute an external program specified as the assigned value and
import its output, which must be in environment key
</listitem>
</varlistentry>
<varlistentry>
- <term><option>file</option></term>
+ <term><literal>builtin</literal></term>
+ <listitem>
+ <para>As <option>program</option>, but use one of the built-in programs rather
+ than an external one.</para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term><literal>file</literal></term>
<listitem>
<para>Import a text file specified as the assigned value, the content
of which must be in environment key format.</para>
</listitem>
</varlistentry>
<varlistentry>
- <term><option>db</option></term>
+ <term><literal>db</literal></term>
<listitem>
<para>Import a single property specified as the assigned value from the
current device database. This works only if the database is already populated
</listitem>
</varlistentry>
<varlistentry>
- <term><option>cmdline</option></term>
+ <term><literal>cmdline</literal></term>
<listitem>
<para>Import a single property from the kernel command line. For simple flags
the value of the property is set to '1'.</para>
</listitem>
</varlistentry>
<varlistentry>
- <term><option>parent</option></term>
+ <term><literal>parent</literal></term>
<listitem>
<para>Import the stored keys from the parent device by reading
the database entry of the parent device. The value assigned to
<term><option>OPTIONS</option></term>
<listitem>
<para>Rule and device options:</para>
- <variablelist>
+ <variablelist class='udev-directives'>
<varlistentry>
<term><option>link_priority=<replaceable>value</replaceable></option></term>
<listitem>
is executed, allowing for the use of device properties set by earlier matching
rules. For all other fields, substitutions are performed while the individual rule is
being processed. The available substitutions are:</para>
- <variablelist>
+ <variablelist class='udev-directives'>
<varlistentry>
<term><option>$kernel</option>, <option>%k</option></term>
<listitem>
</varlistentry>
<varlistentry>
- <term><option>%%</option></term>
+ <term><literal>%%</literal></term>
<listitem>
<para>The '%' character itself.</para>
</listitem>
</varlistentry>
<varlistentry>
- <term><option>$$</option></term>
+ <term><literal>$$</literal></term>
<listitem>
<para>The '$' character itself.</para>
</listitem>
</varlistentry>
</variablelist>
- </refsect2>
</refsect1>
<refsect1>
~ianmdlvl / elogind.git / blobdiff