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https://github.com/morgan9e/systemd
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ac63a04bd6
For "wizard" style interactive tools it's very annoying if they are interrupted by kernel log output or PID1's status output. let's add some infra to disable this temporarily. I decided to implement this as an IPC service so that we can make this robust: if the client request the muting dies we can automatically unmute again. This is hence a tiny varlink service, but it can also be started directly from the cmdline.
80 lines
3.0 KiB
XML
80 lines
3.0 KiB
XML
<?xml version='1.0'?> <!--*-nxml-*-->
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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="systemd-mute-console"
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xmlns:xi="http://www.w3.org/2001/XInclude">
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<refentryinfo>
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<title>systemd-mute-console</title>
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<productname>systemd</productname>
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</refentryinfo>
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<refmeta>
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<refentrytitle>systemd-mute-console</refentrytitle>
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<manvolnum>1</manvolnum>
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</refmeta>
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<refnamediv>
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<refname>systemd-mute-console</refname>
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<refname>systemd-mute-console@.service</refname>
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<refname>systemd-mute-console.socket</refname>
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<refpurpose>Temporarily mute kernel log output and service manager status output to the system console</refpurpose>
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</refnamediv>
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<refsynopsisdiv>
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<cmdsynopsis>
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<command>systemd-mute-console</command>
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<arg choice="opt" rep="repeat">OPTIONS</arg>
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</cmdsynopsis>
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<para><filename>systemd-mute-console@.service</filename></para>
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<para><filename>systemd-mute-console.socket</filename></para>
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</refsynopsisdiv>
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<refsect1>
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<title>Description</title>
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<para>The <command>systemd-mute-console</command> tool and service may be used to
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temporarily mute the log output of the kernel as well as the status output of the service manager to
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the system console. It may be used by tools running on the console to ensure their terminal output is not
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interrupted by unrelated messages.</para>
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<para>The tool can be invoked directly in which case it will mute the two outputs and then issue an
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<citerefentry><refentrytitle>sd_notify</refentrytitle><manvolnum>3</manvolnum></citerefentry>
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<literal>READY=1</literal> notification once that is completed. On <constant>SIGINT</constant> or
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<constant>SIGTERM</constant> output is unmuted again. Alternatively it can be invoked via Varlink
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IPC.</para>
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</refsect1>
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<refsect1>
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<title>Options</title>
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<para>The following options are understood:</para>
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<variablelist>
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<varlistentry>
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<term><option>--kernel=<replaceable>bool</replaceable></option></term>
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<term><option>--pid1=<replaceable>bool</replaceable></option></term>
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<listitem><para>Individually controls which output to mute. If true is specified the respective
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output is muted, if false the output is left as is. Defaults to true.</para>
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<xi:include href="version-info.xml" xpointer="v259"/></listitem>
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</varlistentry>
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<xi:include href="standard-options.xml" xpointer="help" />
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<xi:include href="standard-options.xml" xpointer="version" />
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</variablelist>
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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</refentrytitle><manvolnum>1</manvolnum></citerefentry></member>
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<member><citerefentry><refentrytitle>systemd-firstboot</refentrytitle><manvolnum>1</manvolnum></citerefentry></member>
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</simplelist></para>
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</refsect1>
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</refentry>
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