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df8f9b88bd
These were forgotten during the initial conversion, probably because most of them consisted only of a single entry. Fix that.
153 lines
6.4 KiB
XML
153 lines
6.4 KiB
XML
<?xml version='1.0'?>
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<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
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"http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd">
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<!-- SPDX-License-Identifier: LGPL-2.1-or-later -->
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<refentry id="hwdb" conditional="ENABLE_HWDB">
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<refentryinfo>
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<title>hwdb</title>
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<productname>systemd</productname>
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</refentryinfo>
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<refmeta>
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<refentrytitle>hwdb</refentrytitle>
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<manvolnum>7</manvolnum>
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</refmeta>
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<refnamediv>
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<refname>hwdb</refname>
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<refpurpose>Hardware Database</refpurpose>
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</refnamediv>
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<refsect1><title>Description</title>
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<para>The hardware database is a key-value store for associating modalias-like keys to
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udev-property-like values. It is used primarily by udev to add the relevant properties
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to matching devices, but it can also be queried directly.</para>
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</refsect1>
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<refsect1><title>Hardware Database Files</title>
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<para>The hwdb files are read from the files located in the
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system hwdb directory <filename>/usr/lib/udev/hwdb.d</filename> and
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the local administration directory <filename>/etc/udev/hwdb.d</filename>.
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All hwdb files are collectively sorted and processed in lexical order,
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regardless of the directories in which they live. However, files with
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identical filenames replace each other. Files in <filename>/etc/</filename>
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have the highest priority and take precedence over files with the same
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name in <filename>/usr/lib/</filename>. This can be used to override a
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system-supplied hwdb file with a local file if needed;
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a symlink in <filename>/etc/</filename> with the same name as a hwdb file in
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<filename>/usr/lib/</filename>, pointing to <filename>/dev/null</filename>,
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disables that hwdb file entirely. hwdb files must have the extension
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<filename>.hwdb</filename>; other extensions are ignored.</para>
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<para>Each hwdb file contains data records consisting of matches and associated
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key-value pairs. Every record in the hwdb starts with one or more match strings,
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specifying a shell glob to compare the lookup string against. Multiple match lines
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are specified in consecutive lines. Every match line is compared individually, and
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they are combined by OR. Every match line must start at the first character of the
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line.</para>
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<para>Match patterns consist of literal characters, and shell-style wildcards:</para>
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<itemizedlist>
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<listitem><para>Asterisk <literal>*</literal> matches any number of characters
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</para></listitem>
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<listitem><para>Question mark <literal>?</literal> matches a single character
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</para></listitem>
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<listitem><para>Character list <literal>[<replaceable>chars</replaceable>]</literal> matches one of
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the characters <replaceable>chars</replaceable> listed between <literal>[</literal> and
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<literal>]</literal>. A range may be specified as with a dash as
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<literal>[<replaceable>first</replaceable>-<replaceable>last</replaceable>]</literal>. The match may
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be inverted with a caret <literal>[^…]</literal>.</para></listitem>
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</itemizedlist>
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<para>The match lines are followed by one or more key-value pair lines, which are
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recognized by a leading space character. The key name and value are separated by
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<literal>=</literal>. An empty line signifies the end of a record. Lines beginning
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with <literal>#</literal> are ignored.</para>
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<para>In case multiple records match a given lookup string, the key-value pairs
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from all records are combined. If a key is specified multiple times, the value
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from the record with the highest priority is used (each key can have only a single
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value). The priority is higher when the record is in a file that sorts later
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lexicographically, and in case of records in the same file, later records have
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higher priority.</para>
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<para>The content of all hwdb files is read by
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<citerefentry><refentrytitle>systemd-hwdb</refentrytitle><manvolnum>8</manvolnum></citerefentry>
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and compiled to a binary database located at <filename>/etc/udev/hwdb.bin</filename>,
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or alternatively <filename>/usr/lib/udev/hwdb.bin</filename> if you want ship the
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compiled database in an immutable image. During runtime, only the binary database
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is used.</para>
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</refsect1>
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<refsect1>
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<title>Examples</title>
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<example>
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<title>General syntax of hwdb files</title>
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<programlisting># /usr/lib/udev/hwdb.d/example.hwdb
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# Comments can be placed before any records. This is a good spot
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# to describe what that file is used for, what kind of properties
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# it defines, and the ordering convention.
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# A record with three matches and one property
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mouse:*:name:*Trackball*:*
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mouse:*:name:*trackball*:*
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mouse:*:name:*TrackBall*:*
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ID_INPUT_TRACKBALL=1
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# The rule above could be also be written in a form that
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# matches Tb, tb, TB, tB:
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mouse:*:name:*[tT]rack[bB]all*:*
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ID_INPUT_TRACKBALL=1
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# A record with a single match and five properties
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mouse:usb:v046dp4041:name:Logitech MX Master:*
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MOUSE_DPI=1000@166
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MOUSE_WHEEL_CLICK_ANGLE=15
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MOUSE_WHEEL_CLICK_ANGLE_HORIZONTAL=26
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MOUSE_WHEEL_CLICK_COUNT=24
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MOUSE_WHEEL_CLICK_COUNT_HORIZONTAL=14
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</programlisting>
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</example>
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<example>
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<title>Overriding of properties</title>
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<programlisting># /usr/lib/udev/hwdb.d/60-keyboard.hwdb
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evdev:atkbd:dmi:bvn*:bvr*:bd*:svnAcer*:pn*:*
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KEYBOARD_KEY_a1=help
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KEYBOARD_KEY_a2=setup
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KEYBOARD_KEY_a3=battery
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# Match vendor name "Acer" and any product name starting with "X123"
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evdev:atkbd:dmi:bvn*:bvr*:bd*:svnAcer:pnX123*:*
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KEYBOARD_KEY_a2=wlan
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# /etc/udev/hwdb.d/70-keyboard.hwdb
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# disable wlan key on all at keyboards
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evdev:atkbd:*
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KEYBOARD_KEY_a2=reserved
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PROPERTY_WITH_SPACES=some string</programlisting>
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<para>If the hwdb consists of those two files, a keyboard with the lookup string
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<literal>evdev:atkbd:dmi:bvnAcer:bvr:bdXXXXX:bd08/05/2010:svnAcer:pnX123:</literal>
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will match all three records, and end up with the following properties:</para>
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<programlisting>KEYBOARD_KEY_a1=help
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KEYBOARD_KEY_a2=reserved
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KEYBOARD_KEY_a3=battery
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PROPERTY_WITH_SPACES=some string</programlisting>
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</example>
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</refsect1>
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<refsect1>
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<title>See Also</title>
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<para><simplelist type="inline">
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<member><citerefentry><refentrytitle>systemd-hwdb</refentrytitle><manvolnum>8</manvolnum></citerefentry></member>
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</simplelist></para>
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</refsect1>
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</refentry>
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