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99 lines
4.4 KiB
XML
99 lines
4.4 KiB
XML
<?xml version="1.0"?>
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<!--*-nxml-*-->
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<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN" "http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
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<!--
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This file is part of systemd.
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Copyright 2014 Lennart Poettering
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systemd is free software; you can redistribute it and/or modify it
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under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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systemd is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with systemd; If not, see <http://www.gnu.org/licenses/>.
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-->
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<refentry id="systemd-debug-generator">
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<refentryinfo>
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<title>systemd-debug-generator</title>
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<productname>systemd</productname>
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<authorgroup>
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<author>
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<contrib>Developer</contrib>
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<firstname>Lennart</firstname>
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<surname>Poettering</surname>
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<email>lennart@poettering.net</email>
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</author>
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</authorgroup>
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</refentryinfo>
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<refmeta>
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<refentrytitle>systemd-debug-generator</refentrytitle>
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<manvolnum>8</manvolnum>
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</refmeta>
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<refnamediv>
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<refname>systemd-debug-generator</refname>
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<refpurpose>Generator for enabling a runtime debug shell and masking specific units at boot</refpurpose>
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</refnamediv>
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<refsynopsisdiv>
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<para><filename>/usr/lib/systemd/system-generators/systemd-debug-generator</filename></para>
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</refsynopsisdiv>
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<refsect1>
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<title>Description</title>
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<para><filename>systemd-debug-generator</filename> is
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a generator that reads the kernel command line and
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understands three options:</para>
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<para>If the <option>systemd.mask=</option> option is
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specified and followed by a unit name, this unit is
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masked for the runtime, similar to the effect of
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<citerefentry><refentrytitle>systemctl</refentrytitle><manvolnum>1</manvolnum></citerefentry>'s
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<command>mask</command> command. This is useful to
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boot with certain units removed from the initial boot
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transaction for debugging system startup. May be
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specified more than once.</para>
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<para>If the <option>systemd.wants=</option> option is
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specified and followed by a unit name, a start job for
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this unit is added to the initial transaction. This is
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useful to start one or more additional units at
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boot. May be specified more than once.</para>
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<para>If the <option>systemd.debug-shell</option>
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option is specified, the debug shell service
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<literal>debug-shell.service</literal> is pulled into
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the boot transaction. It will spawn a debug shell on
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tty9 during early system startup. Note that the shell
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may also be turned on persistently by enabling it with
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<citerefentry><refentrytitle>systemctl</refentrytitle><manvolnum>1</manvolnum></citerefentry>'s
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<command>enable</command> command.</para>
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<para><filename>systemd-debug-generator</filename>
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implements the <ulink
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url="http://www.freedesktop.org/wiki/Software/systemd/Generators">generator
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specification</ulink>.</para>
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</refsect1>
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<refsect1>
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<title>See Also</title>
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<para>
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<citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>systemctl</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>kernel-command-line</refentrytitle><manvolnum>7</manvolnum></citerefentry>
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</para>
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</refsect1>
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</refentry>
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