man/systemd.path.xml - systemd-stable - Rivoreo Source Code Repositories

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 <!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>

     <para>If a path unit is beneath another mount point in the file
     system hierarchy, a dependency between both units is created
     automatically.</para>

     <para>Unless <varname>DefaultDependencies=false</varname> is used,
     path units will implicitly 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>
	<?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>

	<para>If a path unit is beneath another mount point in the file
	system hierarchy, a dependency between both units is created
	automatically.</para>

	<para>Unless <varname>DefaultDependencies=false</varname> is used,
	path units will implicitly 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>