236 lines
12 KiB
XML
236 lines
12 KiB
XML
<?xml version='1.0'?> <!--*-nxml-*-->
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<?xml-stylesheet type="text/xsl" href="http://docbook.sourceforge.net/release/xsl/current/xhtml/docbook.xsl"?>
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<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN"
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"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 2010 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.path">
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<refentryinfo>
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<title>systemd.path</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.path</refentrytitle>
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<manvolnum>5</manvolnum>
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</refmeta>
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<refnamediv>
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<refname>systemd.path</refname>
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<refpurpose>Path unit configuration</refpurpose>
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</refnamediv>
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<refsynopsisdiv>
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<para><filename><replaceable>path</replaceable>.path</filename></para>
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</refsynopsisdiv>
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<refsect1>
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<title>Description</title>
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<para>A unit configuration file whose name ends in
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<literal>.path</literal> encodes information about
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a path monitored by systemd, for
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path-based activation.</para>
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<para>This man page lists the configuration options
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specific to this unit type. See
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<citerefentry><refentrytitle>systemd.unit</refentrytitle><manvolnum>5</manvolnum></citerefentry>
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for the common options of all unit configuration
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files. The common configuration items are configured
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in the generic [Unit] and [Install] sections. The
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path specific configuration options are configured in
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the [Path] section.</para>
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<para>For each path file, a matching unit file must
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exist, describing the unit to activate when the path
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changes. By default, a service by the same name as the
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path (except for the suffix) is activated. Example: a
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path file <filename>foo.path</filename> activates a
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matching service <filename>foo.service</filename>. The
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unit to activate may be controlled by
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<varname>Unit=</varname> (see below).</para>
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<para>Internally, path units use the
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<citerefentry><refentrytitle>inotify</refentrytitle><manvolnum>7</manvolnum></citerefentry>
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API to monitor file systems. Due to that, it suffers by the
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same limitations as inotify, and for example cannot be
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used to monitor files or directories changed by other
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machines on remote NFS file systems.</para>
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<para>If a path unit is beneath another mount
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point in the file system hierarchy, a dependency
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between both units is created automatically.</para>
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<para>Unless <varname>DefaultDependencies=false</varname>
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is used, path units will implicitly have dependencies of
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type <varname>Conflicts=</varname> and
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<varname>Before=</varname> on
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<filename>shutdown.target</filename>. These ensure
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that path units are terminated cleanly prior to system
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shutdown. Only path units involved with early boot or
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late system shutdown should disable this option.
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</para>
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</refsect1>
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<refsect1>
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<title>Options</title>
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<para>Path files must include a [Path] section,
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which carries information about the path(s) it
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monitors. The options specific to the [Path] section
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of path units are the following:</para>
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<variablelist class='unit-directives'>
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<varlistentry>
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<term><varname>PathExists=</varname></term>
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<term><varname>PathExistsGlob=</varname></term>
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<term><varname>PathChanged=</varname></term>
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<term><varname>PathModified=</varname></term>
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<term><varname>DirectoryNotEmpty=</varname></term>
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<listitem><para>Defines paths to
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monitor for certain changes:
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<varname>PathExists=</varname> may be
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used to watch the mere existence of a
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file or directory. If the file
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specified exists, the configured unit
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is
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activated. <varname>PathExistsGlob=</varname>
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works similar, but checks for the
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existence of at least one file
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matching the globbing pattern
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specified. <varname>PathChanged=</varname>
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may be used to watch a file or
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directory and activate the configured
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unit whenever it changes. It is not
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activated on every write to the
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watched file but it is activated if
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the file which was open for writing
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gets
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closed. <varname>PathModified=</varname>
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is similar, but additionally it is
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activated also on simple writes to the
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watched file.
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<varname>DirectoryNotEmpty=</varname>
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may be used to watch a directory and
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activate the configured unit whenever
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it contains at least one file.</para>
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<para>The arguments of these
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directives must be absolute file
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system paths.</para>
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<para>Multiple directives may be
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combined, of the same and of different
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types, to watch multiple paths. If the
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empty string is assigned to any of
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these options, the list of paths to
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watch is reset, and any prior
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assignments of these options will not
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have any effect.</para>
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<para>If a path already exists
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(in case of
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<varname>PathExists=</varname> and
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<varname>PathExistsGlob=</varname>) or
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a directory already is not empty (in
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case of
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<varname>DirectoryNotEmpty=</varname>)
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at the time the path unit is
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activated, then the configured unit is
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immediately activated as
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well. Something similar does not apply
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to <varname>PathChanged=</varname> and
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<varname>PathModified=</varname>.</para>
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<para>If the path itself or any of the
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containing directories are not
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accessible, <command>systemd</command>
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will watch for permission changes and
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notice that conditions are satisfied
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when permissions allow that.
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</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><varname>Unit=</varname></term>
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<listitem><para>The unit to activate
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when any of the configured paths
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changes. The argument is a unit name,
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whose suffix is not
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<literal>.path</literal>. If not
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specified, this value defaults to a
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service that has the same name as the
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path unit, except for the suffix. (See
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above.) It is recommended that the
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unit name that is activated and the
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unit name of the path unit are named
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identical, except for the
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suffix.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><varname>MakeDirectory=</varname></term>
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<listitem><para>Takes a boolean
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argument. If true, the directories to
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watch are created before
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watching. This option is ignored for
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<varname>PathExists=</varname>
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settings. Defaults to
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<option>false</option>.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><varname>DirectoryMode=</varname></term>
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<listitem><para>If
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<varname>MakeDirectory=</varname> is
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enabled, use the mode specified here to
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create the directories in
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question. Takes an access mode in
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octal notation. Defaults to
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<option>0755</option>.</para></listitem>
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</varlistentry>
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</variablelist>
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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>8</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>systemd.unit</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>systemd.service</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>inotify</refentrytitle><manvolnum>7</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>systemd.directives</refentrytitle><manvolnum>7</manvolnum></citerefentry>
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</para>
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</refsect1>
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</refentry>
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