picnoir
/
Systemd
1
0
Fork 0
Code Issues Pull Requests Projects Releases Wiki Activity

man: udev - add section about hwdb

This commit is contained in:
Kay Sievers 2013-07-21 01:32:27 +02:00
parent 459da00fe6
commit eb75d0ed05
1 changed files with 41 additions and 8 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

49
man/udev.xml
View File

@ -30,7 +30,7 @@
<refnamediv>
<refname>udev</refname>
<refpurpose>Linux dynamic device management</refpurpose>
<refpurpose>Dynamic device management</refpurpose>
</refnamediv>
<refsect1><title>Description</title>
@ -54,7 +54,7 @@
sources is provided by the library libudev.</para>
</refsect1>
<refsect1><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>
@ -67,10 +67,8 @@
used to override a system-supplied rules file with a local file if needed;
a symlink in <filename>/etc</filename> with the same name as a rules file in
<filename>/lib</filename>, pointing to <filename>/dev/null</filename>,
disables the rules file entirely.</para>
<para>Rule files must have the extension <filename>.rules</filename>; other
extensions are ignored.</para>
disables the rules file entirely. Rule files must have the extension
<filename>.rules</filename>; other 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 <literal>#</literal>, which are ignored.
@ -273,7 +271,7 @@
</varlistentry>
</variablelist>
<para>Most of the fields support shell-style pattern matching. The following
<para>Most of the fields support shell glob pattern matching. The following
pattern characters are supported:</para>
<variablelist>
<varlistentry>
@ -471,7 +469,7 @@
<para>Import the stored keys from the parent device by reading
the database entry of the parent device. The value assigned to
<option>IMPORT{parent}</option> is used as a filter of key names
to import (with the same shell-style pattern matching used for
to import (with the same shell glob pattern matching used for
comparisons).</para>
</listitem>
</varlistentry>
@ -701,6 +699,41 @@
</variablelist>
</refsect1>
<refsect1><title>Hardware Database Files</title>
<para>The hwdb files are read from the files located in the
system hwdb directory <filename>/usr/lib/udev/hwdb.d</filename>,
the volatile runtime directory <filename>/run/udev/hwdb.d</filename>
and the local administration directory <filename>/etc/udev/hwdb.d</filename>.
All rules files are collectively sorted and processed in lexical order,
regardless of the directories in which they live. However, files with
identical filenames replace each other. Files in <filename>/etc</filename>
have the highest priority, files in <filename>/run</filename> take precedence
over files with the same name in <filename>/lib</filename>. This can be
used to override a system-supplied hwdb file with a local file if needed;
a symlink in <filename>/etc</filename> with the same name as a rules file in
<filename>/lib</filename>, pointing to <filename>/dev/null</filename>,
disables the rules file entirely. Hwdb files must have the extension
<filename>.hwdb</filename>; other extensions are ignored.</para>
<para>The hwdb file contains data records consisting of matches and
associated key-value pairs. Every record in the hwdb starts with one or
more match string, specifying a shell glob to compare the database
lookup string against. Multiple match lines are specified in additional
consecutive lines. Every match line is compared indivdually, they are
combined by OR. Every match line must start at the first character of
the line.</para>
<para>The match lines are followed by one or more key-value pair lines, which
are recognized by a leading space character. The key name and value are separated
by <literal>=</literal>. An empty line signifies the end
of a record. Lines beginning with <literal>#</literal> are ignored.</para>
<para>The content of all hwdb files is read by
<citerefentry><refentrytitle>udevadm</refentrytitle><manvolnum>8</manvolnum></citerefentry>
and compiled to a binary database located at <filename>/etc/udev/hwdb.bin</filename>.
During runtime only the binary database is used.</para>
</refsect1>
<refsect1>
<title>See Also</title>
<para><citerefentry>