summaryrefslogtreecommitdiff
path: root/man/udev.xml
diff options
context:
space:
mode:
authorAnthony G. Basile <blueness@gentoo.org>2014-12-20 11:45:25 -0500
committerAnthony G. Basile <blueness@gentoo.org>2014-12-20 11:45:25 -0500
commit9d06e6560812229dc20a841057f2dc9d4f346723 (patch)
tree0581d733c3a4093a1a1c89e3e0a0ed8914f62682 /man/udev.xml
parent1e1eddac8da821f8219f2856efe214cb29a284a7 (diff)
man/udev.xml: restore hwdb documentation
Diffstat (limited to 'man/udev.xml')
-rw-r--r--man/udev.xml37
1 files changed, 37 insertions, 0 deletions
diff --git a/man/udev.xml b/man/udev.xml
index 3cf3c7f5b3..69be5d19c5 100644
--- a/man/udev.xml
+++ b/man/udev.xml
@@ -762,6 +762,43 @@
During runtime only the binary database is used.</para>
</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 hwdb 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>/usr/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 hwdb file in
+ <filename>/usr/lib</filename>, pointing to <filename>/dev/null</filename>,
+ disables the hwdb 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>,
+ or alternatively <filename>/usr/lib/udev/hwdb.bin</filename> if you want ship the compiled
+ database in an immutable image.
+ During runtime only the binary database is used.</para>
+ </refsect1>
+
<refsect1>
<title>See Also</title>
<para>