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authorAnthony G. Basile <blueness@gentoo.org>2012-11-15 10:33:16 -0500
committerAnthony G. Basile <blueness@gentoo.org>2012-11-15 10:33:16 -0500
commit7d4a62f8c1404ed426500b97af03d4ef8d034a71 (patch)
tree2436cd4f0460a3a3d589875d4ffba55556f3c582 /man/systemd.preset.xml
parent2944f347d087ff24ec808e4b70fe104a772a97a0 (diff)
Isolation of udev code from remaining systemd
This commit is a first attempt to isolate the udev code from the remaining code base. It intentionally does not modify any files but purely delete files which, on a first examination, appear to not be needed. This is a sweeping commit which may easily have missed needed code. Files can be retrieved by doing a checkout from the previous commit: git checkout 2944f347d0 -- <filename>
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1 files changed, 0 insertions, 204 deletions
diff --git a/man/systemd.preset.xml b/man/systemd.preset.xml
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-<?xml version="1.0"?>
-<!--*-nxml-*-->
-<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN" "http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
-<!--
- This file is part of systemd.
-
- Copyright 2011 Lennart Poettering
-
- systemd is free software; you can redistribute it and/or modify it
- under the terms of the GNU Lesser General Public License as published by
- the Free Software Foundation; either version 2.1 of the License, or
- (at your option) any later version.
-
- systemd is distributed in the hope that it will be useful, but
- WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- Lesser General Public License for more details.
-
- You should have received a copy of the GNU Lesser General Public License
- along with systemd; If not, see <http://www.gnu.org/licenses/>.
--->
-<refentry id="systemd.preset">
-
- <refentryinfo>
- <title>systemd.preset</title>
- <productname>systemd</productname>
-
- <authorgroup>
- <author>
- <contrib>Developer</contrib>
- <firstname>Lennart</firstname>
- <surname>Poettering</surname>
- <email>lennart@poettering.net</email>
- </author>
- </authorgroup>
- </refentryinfo>
-
- <refmeta>
- <refentrytitle>systemd.preset</refentrytitle>
- <manvolnum>5</manvolnum>
- </refmeta>
-
- <refnamediv>
- <refname>systemd.preset</refname>
- <refpurpose>Service enablement presets</refpurpose>
- </refnamediv>
-
- <refsynopsisdiv>
- <para><filename>/etc/systemd/system-preset/*.preset</filename></para>
- <para><filename>/run/systemd/system-preset/*.preset</filename></para>
- <para><filename>/usr/lib/systemd/system-preset/*.preset</filename></para>
- <para><filename>/etc/systemd/user-preset/*.preset</filename></para>
- <para><filename>/run/systemd/user-preset/*.preset</filename></para>
- <para><filename>/usr/lib/systemd/user-preset/*.preset</filename></para>
- </refsynopsisdiv>
-
- <refsect1>
- <title>Description</title>
-
- <para>Preset files may be used to encode policy which
- units shall be enabled by default and which ones
- shall be disabled. They are read by <command>systemctl
- preset</command> (for more information see
- <citerefentry><refentrytitle>systemctl</refentrytitle><manvolnum>1</manvolnum></citerefentry>)
- which uses this information to enable or disable a
- unit according to preset policy. <command>systemctl
- preset</command> is used by the post install
- scriptlets of RPM packages (or other OS package formats),
- to enable/disable specific units by default on package
- installation, enforcing distribution, spin or
- administrator preset policy. This allows choosing a certain
- set of units to be enabled/disabled even before
- installing the actual package.</para>
-
- <para>For more information on the preset logic please
- have a look at the <ulink
- url="http://freedesktop.org/wiki/Software/systemd/Preset">Presets</ulink>
- document.</para>
-
- <para>It is not recommended to ship preset files
- within the respective software packages implementing
- the units, but rather centralize them in a
- distribution or spin default policy, which can be
- amended by administrator policy.</para>
-
- <para>If no preset files exist, <command>systemctl
- preset</command> will enable all units that are
- installed by default. If this is not desired and all
- units shall rather be disabled it is necessary to ship
- a preset file with a single, catchall
- "<filename>disable *</filename>" line. (See example 1,
- below.)</para>
- </refsect1>
-
- <refsect1>
- <title>Preset File Format</title>
-
- <para>The preset files contain a list of
- directives consisting of either the word
- <literal>enable</literal> or
- <literal>disable</literal> followed by a space and a
- unit name (possibly with shell style wildcards),
- separated by newlines. Empty lines and lines whose
- first non-whitespace character is # or ; are
- ignored.</para>
-
- <para>Two different directives are understood:
- <literal>enable</literal> may be used to enable units
- by default, <literal>disable</literal> to disable
- units by default.</para>
-
- <para>If multiple lines apply to a unit name the
- first matching one takes precedence over all
- others.</para>
-
- <para>Each preset file shall be named in the style of
- <filename>&lt;priority&gt;-&lt;program&gt;.conf</filename>.
- Files in <filename>/etc/</filename> override files
- with the same name in <filename>/usr/lib/</filename>
- and <filename>/run/</filename>. Files in
- <filename>/run/</filename> override files with the
- same name in <filename>/usr/lib/</filename>. Packages
- should install their preset files in
- <filename>/usr/lib/</filename>. Files in
- <filename>/etc/</filename> are reserved for the local
- administrator, who may use this logic to override the
- preset files installed by vendor packages. All preset
- files are sorted by their filename in alphabetical
- order, regardless in which of the directories they
- reside, to guarantee that a specific preset file takes
- precedence over another file with an alphabetically
- earlier name, if both files contain lines that apply
- to the same unit names. It is recommended to prefix
- all file names with two-digit number, to simplify
- ordering.</para>
-
- <para>If the administrator wants to disable a preset
- file supplied by the vendor the recommended way is to
- place a symlink to <filename>/dev/null</filename> in
- <filename>/etc/systemd/system-preset/</filename>
- bearing the same file name.</para>
- </refsect1>
-
- <refsect1>
- <title>Example</title>
-
- <example>
- <title>Default off example <filename>/usr/lib/systemd/system-preset/99-default.preset</filename>:</title>
-
- <programlisting>disable *</programlisting>
- </example>
-
- <para>This disables all units. Due to the file name
- prefix <literal>99-</literal> it will be read last and
- hence can easily be overridden by spin or
- administrator preset policy or suchlike.</para>
-
- <example>
- <title>A GNOME spin example <filename>/usr/lib/systemd/system-preset/50-gnome.preset</filename>:</title>
-
- <programlisting>enable gdm.service
-enable colord.service
-enable accounts-daemon.service
-enable avahi-daemon.*</programlisting>
-
- </example>
-
- <para>This enables the three mentioned units, plus all
- <filename>avahi-daemon</filename> regardless of which
- unit type. A file like this could be useful for
- inclusion in a GNOME spin of a distribution. It will
- ensure that the units necessary for GNOME are properly
- enabled as they are installed. It leaves all other
- units untouched, and subject to other (later) preset
- files, for example like the one from the first example
- above.</para>
-
- <example>
- <title>Administrator policy <filename>/etc/systemd/system-preset/00-lennart.preset</filename>:</title>
-
- <programlisting>enable httpd.service
-enable sshd.service
-enable postfix.service
-disable *</programlisting>
- </example>
-
- <para>This enables three specific services and
- disables all others. This is useful for administrators
- to specifically select the units to enable, and
- disable all others. Due to the file name prefix
- <literal>00-</literal> it will be read early and hence
- overrides all other preset policy files.</para>
- </refsect1>
-
- <refsect1>
- <title>See Also</title>
- <para>
- <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
- <citerefentry><refentrytitle>systemctl</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
- <citerefentry><refentrytitle>systemd-delta</refentrytitle><manvolnum>1</manvolnum></citerefentry>
- </para>
- </refsect1>
-
-</refentry>