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5430f7f2bc
We finally got the OK from all contributors with non-trivial commits to relicense systemd from GPL2+ to LGPL2.1+. Some udev bits continue to be GPL2+ for now, but we are looking into relicensing them too, to allow free copy/paste of all code within systemd. The bits that used to be MIT continue to be MIT. The big benefit of the relicensing is that closed source code may now link against libsystemd-login.so and friends.
221 lines
11 KiB
XML
221 lines
11 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>systemd path configuration files</refpurpose>
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</refnamediv>
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<refsynopsisdiv>
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<para><filename>systemd.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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<filename>.path</filename> 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 an 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=</varname>
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is set to <option>false</option>, path units will
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implicitly have dependencies of type
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<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
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option.</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>
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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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existance 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 activated
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on every write to the watched file but it is
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activated if the file which was open for writing
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gets closed. <varname>PathModified=</varname>
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is similar, but additionally it is activated
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also on simple writes to the 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.</para>
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<para>If a path is already existing
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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>.
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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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<filename>.path</filename>. 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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</para>
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</refsect1>
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</refentry>
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