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1 | <?xml version="1.0"?> |
2 | <!--*-nxml-*--> | |
3 | <!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN" "http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd"> | |
4 | <!-- | |
5 | This file is part of systemd. | |
6 | ||
7 | Copyright 2014 Lennart Poettering | |
8 | ||
9 | systemd is free software; you can redistribute it and/or modify it | |
10 | under the terms of the GNU Lesser General Public License as published by | |
11 | the Free Software Foundation; either version 2.1 of the License, or | |
12 | (at your option) any later version. | |
13 | ||
14 | systemd is distributed in the hope that it will be useful, but | |
15 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
17 | Lesser General Public License for more details. | |
18 | ||
19 | You should have received a copy of the GNU Lesser General Public License | |
20 | along with systemd; If not, see <http://www.gnu.org/licenses/>. | |
21 | --> | |
22 | <refentry id="systemd-debug-generator"> | |
23 | ||
24 | <refentryinfo> | |
25 | <title>systemd-debug-generator</title> | |
26 | <productname>systemd</productname> | |
27 | ||
28 | <authorgroup> | |
29 | <author> | |
30 | <contrib>Developer</contrib> | |
31 | <firstname>Lennart</firstname> | |
32 | <surname>Poettering</surname> | |
33 | <email>lennart@poettering.net</email> | |
34 | </author> | |
35 | </authorgroup> | |
36 | </refentryinfo> | |
37 | ||
38 | <refmeta> | |
39 | <refentrytitle>systemd-debug-generator</refentrytitle> | |
40 | <manvolnum>8</manvolnum> | |
41 | </refmeta> | |
42 | ||
43 | <refnamediv> | |
44 | <refname>systemd-debug-generator</refname> | |
45 | <refpurpose>Generator for enabling a runtime debug shell and masking specific units at boot</refpurpose> | |
46 | </refnamediv> | |
47 | ||
48 | <refsynopsisdiv> | |
49 | <para><filename>/usr/lib/systemd/system-generators/systemd-debug-generator</filename></para> | |
50 | </refsynopsisdiv> | |
51 | ||
52 | <refsect1> | |
53 | <title>Description</title> | |
54 | ||
55 | <para><filename>systemd-debug-generator</filename> is | |
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56 | a generator that reads the kernel command line and |
57 | understands three options:</para> | |
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58 | |
59 | <para>If the <option>systemd.mask=</option> option is | |
60 | specified and followed by a unit name this unit is | |
61 | masked for the runtime, similar to the effect of | |
62 | <citerefentry><refentrytitle>systemctl</refentrytitle><manvolnum>1</manvolnum></citerefentry>'s | |
63 | <command>mask</command> command. This is useful to | |
64 | boot with certain units removed from the initial boot | |
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65 | transaction for debugging system startup. May be |
66 | specified more than once.</para> | |
67 | ||
68 | <para>If the <option>systemd.wants=</option> option is | |
69 | specified and followed by a unit name a start job for | |
70 | this unit is added to the initial transaction. This is | |
71 | useful to start one ore more additional units at | |
72 | boot. May be specified more than once.</para> | |
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73 | |
74 | <para>If the <option>systemd.debug-shell</option> | |
75 | option is specified the debug shell service | |
76 | <literal>debug-shell.service</literal> is pulled into | |
77 | the boot transaction. It will spawn a debug shell on | |
78 | tty9 during early system startup. Note that the shell | |
79 | may also be turned on persistently by enabling it with | |
80 | <citerefentry><refentrytitle>systemctl</refentrytitle><manvolnum>1</manvolnum></citerefentry>'s | |
81 | <command>enable</command> command.</para> | |
82 | ||
83 | <para><filename>systemd-debug-generator</filename> | |
84 | implements the <ulink | |
85 | url="http://www.freedesktop.org/wiki/Software/systemd/Generators">generator | |
86 | specification</ulink>.</para> | |
87 | </refsect1> | |
88 | ||
89 | <refsect1> | |
90 | <title>See Also</title> | |
91 | <para> | |
92 | <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>, | |
93 | <citerefentry><refentrytitle>systemctl</refentrytitle><manvolnum>1</manvolnum></citerefentry>, | |
94 | <citerefentry><refentrytitle>kernel-command-line</refentrytitle><manvolnum>7</manvolnum></citerefentry> | |
95 | </para> | |
96 | </refsect1> | |
97 | ||
98 | </refentry> |