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Zbigniew Jędrzejewski-Szmek
2015-02-03 23:11:35 -05:00
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<?xml version='1.0'?> <!--*-nxml-*-->
<?xml-stylesheet type="text/xsl" href="http://docbook.sourceforge.net/release/xsl/current/xhtml/docbook.xsl"?>
<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN"
"http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
"http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
<!--
This file is part of systemd.
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<refentry id="systemd.path">
<refentryinfo>
<title>systemd.path</title>
<productname>systemd</productname>
<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>
<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>
<refmeta>
<refentrytitle>systemd.path</refentrytitle>
<manvolnum>5</manvolnum>
</refmeta>
<refnamediv>
<refname>systemd.path</refname>
<refpurpose>Path unit configuration</refpurpose>
</refnamediv>
<refnamediv>
<refname>systemd.path</refname>
<refpurpose>Path unit configuration</refpurpose>
</refnamediv>
<refsynopsisdiv>
<para><filename><replaceable>path</replaceable>.path</filename></para>
</refsynopsisdiv>
<refsynopsisdiv>
<para><filename><replaceable>path</replaceable>.path</filename></para>
</refsynopsisdiv>
<refsect1>
<title>Description</title>
<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>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>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>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><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>Internally, path units use the
<citerefentry><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>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>
<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>
<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>
<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>
<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>
<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>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>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 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>
<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>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>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>
<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><refentrytitle>inotify</refentrytitle><manvolnum>7</manvolnum></citerefentry>,
<citerefentry><refentrytitle>systemd.directives</refentrytitle><manvolnum>7</manvolnum></citerefentry>
</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.unit</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
<citerefentry><refentrytitle>systemd.service</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
<citerefentry><refentrytitle>inotify</refentrytitle><manvolnum>7</manvolnum></citerefentry>,
<citerefentry><refentrytitle>systemd.directives</refentrytitle><manvolnum>7</manvolnum></citerefentry>
</para>
</refsect1>
</refentry>