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man: mention new OPTIONS=log_level= udev rule

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This commit is contained in:
Yu Watanabe 2020-12-08 23:11:03 +09:00
parent 1a0bd01529
commit 563a94d080
1 changed files with 18 additions and 0 deletions
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18
man/udev.xml
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@ -647,6 +647,24 @@
on the transition from initramfs.</para>
</listitem>
</varlistentry>
<varlistentry>
<term><option>log_level=<replaceable>level</replaceable></option></term>
<listitem>
<para>Takes a log level name like <literal>debug</literal> or
<literal>info</literal>, or a special value <literal>reset</literal>. When a log
level name is specified, the maximum log level is changed to that level. When
<literal>reset</literal> is set, then the previously specified log level is
revoked. Defaults to the log level of the main process of
<command>systemd-udevd</command>.</para>
<para>This may be useful when debugging events for certain devices. Note that the
log level is applied when the line including this rule is processed. So, for
debugging, it is recommended that this is specified at earlier place, e.g., the
first line of <filename>00-debug.rules</filename>.</para>
<para>Example for debugging uevent processing for network interfaces.
<programlisting># /etc/udev/rules.d/00-debug-net.rules
SUBSYSTEM=="net", OPTIONS="log_level=debug"</programlisting></para>
</listitem>
</varlistentry>
</variablelist>
</listitem>
</varlistentry>