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- SPDX-License-Identifier: LGPL-2.1+
-
- Copyright 2014 Lennart Poettering
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+<!-- SPDX-License-Identifier: LGPL-2.1-or-later -->
<refentry id="systemd-debug-generator">
<refentryinfo>
<title>systemd-debug-generator</title>
<productname>systemd</productname>
-
- <authorgroup>
- <author>
- <contrib>Developer</contrib>
- <firstname>Lennart</firstname>
- <surname>Poettering</surname>
- <email>lennart@poettering.net</email>
- </author>
- </authorgroup>
</refentryinfo>
<refmeta>
that reads the kernel command line and understands three
options:</para>
- <para>If the <option>systemd.mask=</option> option is specified
- and followed by a unit name, this unit is masked for the runtime,
- similar to the effect of
+ <para>If the <option>systemd.mask=</option> or <option>rd.systemd.mask=</option>
+ option is specified and followed by a unit name, this unit is
+ masked for the runtime (i.e. for this session — from boot to shutdown), similarly to the effect of
<citerefentry><refentrytitle>systemctl</refentrytitle><manvolnum>1</manvolnum></citerefentry>'s
<command>mask</command> command. This is useful to boot with
certain units removed from the initial boot transaction for
- debugging system startup. May be specified more than once.</para>
+ debugging system startup. May be specified more than once.
+ <option>rd.systemd.mask=</option> is honored only by initial
+ RAM disk (initrd) while <option>systemd.mask=</option> is
+ honored only in the main system.</para>
- <para>If the <option>systemd.wants=</option> option is specified
+ <para>If the <option>systemd.wants=</option> or
+ <option>rd.systemd.wants=</option> option is specified
and followed by a unit name, a start job for this unit is added to
the initial transaction. This is useful to start one or more
- additional units at boot. May be specified more than once.</para>
+ additional units at boot. May be specified more than once.
+ <option>rd.systemd.wants=</option> is honored only by initial
+ RAM disk (initrd) while <option>systemd.wants=</option> is
+ honored only in the main system.</para>
- <para>If the <option>systemd.debug_shell</option> option is
+ <para>If the <option>systemd.debug_shell</option> or
+ <option>rd.systemd.debug_shell</option> option is
specified, the debug shell service
<literal>debug-shell.service</literal> is pulled into the boot
- transaction. It will spawn a debug shell on tty9 during early
- system startup. Note that the shell may also be turned on
- persistently by enabling it with
+ transaction and a debug shell will be spawned during early boot.
+ By default, <filename>&DEBUGTTY;</filename> is used, but a specific tty can also be set,
+ either with or without the <filename>/dev/</filename> prefix.
+ Note that the shell may also be turned on persistently by enabling it with
<citerefentry><refentrytitle>systemctl</refentrytitle><manvolnum>1</manvolnum></citerefentry>'s
- <command>enable</command> command.</para>
+ <command>enable</command> command.
+ <option>rd.systemd.debug_shell=</option> is honored only by initial
+ RAM disk (initrd) while <option>systemd.debug_shell</option> is
+ honored only in the main system.</para>
<para><filename>systemd-debug-generator</filename> implements
<citerefentry><refentrytitle>systemd.generator</refentrytitle><manvolnum>7</manvolnum></citerefentry>.</para>
<refsect1>
<title>See Also</title>
- <para>
- <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
- <citerefentry><refentrytitle>systemctl</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
- <citerefentry><refentrytitle>kernel-command-line</refentrytitle><manvolnum>7</manvolnum></citerefentry>
- </para>
+ <para><simplelist type="inline">
+ <member><citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry></member>
+ <member><citerefentry><refentrytitle>systemctl</refentrytitle><manvolnum>1</manvolnum></citerefentry></member>
+ <member><citerefentry><refentrytitle>kernel-command-line</refentrytitle><manvolnum>7</manvolnum></citerefentry></member>
+ </simplelist></para>
</refsect1>
</refentry>