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authorLuke Shumaker <lukeshu@sbcglobal.net>2016-12-17 03:04:41 -0500
committerLuke Shumaker <lukeshu@sbcglobal.net>2016-12-17 03:04:41 -0500
commitfd6ea8a3f4999133f8ac036a23584c3e5f9e9b3f (patch)
tree6cdd53846655b04b178b4b8057c915c61a9cb525 /man/systemd.path.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 2010 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.path">
- <refentryinfo>
- <title>systemd.path</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.path</refentrytitle>
- <manvolnum>5</manvolnum>
- </refmeta>
-
- <refnamediv>
- <refname>systemd.path</refname>
- <refpurpose>Path unit configuration</refpurpose>
- </refnamediv>
-
- <refsynopsisdiv>
- <para><filename><replaceable>path</replaceable>.path</filename></para>
- </refsynopsisdiv>
-
- <refsect1>
- <title>Description</title>
-
- <para>A unit configuration file whose name ends in
- <literal>.path</literal> encodes information about a path
- monitored by systemd, for path-based activation.</para>
-
- <para>This man page lists the configuration options specific to
- this unit type. See
- <citerefentry><refentrytitle>systemd.unit</refentrytitle><manvolnum>5</manvolnum></citerefentry>
- for the common options of all unit configuration files. The common
- configuration items are configured in the generic [Unit] and
- [Install] sections. The path specific configuration options are
- configured in the [Path] section.</para>
-
- <para>For each path file, a matching unit file must exist,
- describing the unit to activate when the path changes. By default,
- a service by the same name as the path (except for the suffix) is
- activated. Example: a path file <filename>foo.path</filename>
- activates a matching service <filename>foo.service</filename>. The
- unit to activate may be controlled by <varname>Unit=</varname>
- (see below).</para>
-
- <para>Internally, path units use the
- <citerefentry project='man-pages'><refentrytitle>inotify</refentrytitle><manvolnum>7</manvolnum></citerefentry>
- API to monitor file systems. Due to that, it suffers by the same
- limitations as inotify, and for example cannot be used to monitor
- files or directories changed by other machines on remote NFS file
- systems.</para>
- </refsect1>
-
- <refsect1>
- <title>Automatic Dependencies</title>
-
- <para>If a path unit is beneath another mount unit in the file
- system hierarchy, both a requirement and an ordering dependency
- between both units are created automatically.</para>
-
- <para>An implicit <varname>Before=</varname> dependency is added
- between a path unit and the unit it is supposed to activate.</para>
-
- <para>Unless <varname>DefaultDependencies=false</varname> in the <literal>[Unit]</literal> section is used, path
- units will implicitly have dependencies of type <varname>Before=</varname> on <filename>paths.target</filename>,
- dependencies of type <varname>After=</varname> and <varname>Requires=</varname> on
- <filename>sysinit.target</filename>, and have dependencies of type <varname>Conflicts=</varname> and
- <varname>Before=</varname> on <filename>shutdown.target</filename>. These ensure that path units are terminated
- cleanly prior to system shutdown. Only path units involved with early boot or late system shutdown should disable
- this option.
- </para>
- </refsect1>
-
- <refsect1>
- <title>Options</title>
-
- <para>Path files must include a [Path] section, which carries
- information about the path(s) it monitors. The options specific to
- the [Path] section of path units are the following:</para>
-
- <variablelist class='unit-directives'>
- <varlistentry>
- <term><varname>PathExists=</varname></term>
- <term><varname>PathExistsGlob=</varname></term>
- <term><varname>PathChanged=</varname></term>
- <term><varname>PathModified=</varname></term>
- <term><varname>DirectoryNotEmpty=</varname></term>
-
- <listitem><para>Defines paths to monitor for certain changes:
- <varname>PathExists=</varname> may be used to watch the mere
- existence of a file or directory. If the file specified
- exists, the configured unit is activated.
- <varname>PathExistsGlob=</varname> works similar, but checks
- for the existence of at least one file matching the globbing
- pattern specified. <varname>PathChanged=</varname> may be used
- to watch a file or directory and activate the configured unit
- whenever it changes. It is not activated on every write to the
- watched file but it is activated if the file which was open
- for writing gets closed. <varname>PathModified=</varname> is
- similar, but additionally it is activated also on simple
- writes to the watched file.
- <varname>DirectoryNotEmpty=</varname> may be used to watch a
- directory and activate the configured unit whenever it
- contains at least one file.</para>
-
- <para>The arguments of these directives must be absolute file
- system paths.</para>
-
- <para>Multiple directives may be combined, of the same and of
- different types, to watch multiple paths. If the empty string
- is assigned to any of these options, the list of paths to
- watch is reset, and any prior assignments of these options
- will not have any effect.</para>
-
- <para>If a path already exists (in case of
- <varname>PathExists=</varname> and
- <varname>PathExistsGlob=</varname>) or a directory already is
- not empty (in case of <varname>DirectoryNotEmpty=</varname>)
- at the time the path unit is activated, then the configured
- unit is immediately activated as well. Something similar does
- not apply to <varname>PathChanged=</varname> and
- <varname>PathModified=</varname>.</para>
-
- <para>If the path itself or any of the containing directories
- are not accessible, <command>systemd</command> will watch for
- permission changes and notice that conditions are satisfied
- when permissions allow that. </para></listitem>
- </varlistentry>
- <varlistentry>
- <term><varname>Unit=</varname></term>
-
- <listitem><para>The unit to activate when any of the
- configured paths changes. The argument is a unit name, whose
- suffix is not <literal>.path</literal>. If not specified, this
- value defaults to a service that has the same name as the path
- unit, except for the suffix. (See above.) It is recommended
- that the unit name that is activated and the unit name of the
- path unit are named identical, except for the
- suffix.</para></listitem>
- </varlistentry>
- <varlistentry>
- <term><varname>MakeDirectory=</varname></term>
-
- <listitem><para>Takes a boolean argument. If true, the
- directories to watch are created before watching. This option
- is ignored for <varname>PathExists=</varname> settings.
- Defaults to <option>false</option>.</para></listitem>
- </varlistentry>
- <varlistentry>
- <term><varname>DirectoryMode=</varname></term>
-
- <listitem><para>If <varname>MakeDirectory=</varname> is
- enabled, use the mode specified here to create the directories
- in question. Takes an access mode in octal notation. Defaults
- to <option>0755</option>.</para></listitem>
- </varlistentry>
- </variablelist>
- </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.unit</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
- <citerefentry><refentrytitle>systemd.service</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
- <citerefentry project='man-pages'><refentrytitle>inotify</refentrytitle><manvolnum>7</manvolnum></citerefentry>,
- <citerefentry><refentrytitle>systemd.directives</refentrytitle><manvolnum>7</manvolnum></citerefentry>
- </para>
- </refsect1>
-
-</refentry>