Adding upstream version 252.22.upstream/252.22upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 225 insertions, 0 deletions

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+<?xml version='1.0'?> <!--*-nxml-*-->
+<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
+  "http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
+<!-- SPDX-License-Identifier: LGPL-2.1-or-later -->
+
+<refentry id="systemd.path" xmlns:xi="http://www.w3.org/2001/XInclude">
+  <refentryinfo>
+    <title>systemd.path</title>
+    <productname>systemd</productname>
+  </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>When a service unit triggered by a path unit terminates (regardless whether it exited successfully
+    or failed), monitored paths are checked immediately again, and the service accordingly restarted
+    instantly. As protection against busy looping in this trigger/start cycle, a start rate limit is enforced
+    on the service unit, see <varname>StartLimitIntervalSec=</varname> and
+    <varname>StartLimitBurst=</varname> in
+    <citerefentry><refentrytitle>systemd.unit</refentrytitle><manvolnum>5</manvolnum></citerefentry>. Unlike
+    other service failures, the error condition that the start rate limit is hit is propagated from the
+    service unit to the path unit and causes the path unit to fail as well, thus ending the loop.</para>
+  </refsect1>
+
+  <refsect1>
+    <title>Automatic Dependencies</title>
+
+    <refsect2>
+      <title>Implicit Dependencies</title>
+
+      <para>The following dependencies are implicitly added:</para>
+
+      <itemizedlist>
+        <listitem><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></listitem>
+
+        <listitem><para>An implicit <varname>Before=</varname> dependency is added
+        between a path unit and the unit it is supposed to activate.</para></listitem>
+      </itemizedlist>
+    </refsect2>
+
+    <refsect2>
+      <title>Default Dependencies</title>
+
+      <para>The following dependencies are added unless <varname>DefaultDependencies=no</varname> is set:</para>
+
+      <itemizedlist>
+        <listitem><para>Path units will automatically 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 <varname>DefaultDependencies=</varname> option.</para></listitem>
+      </itemizedlist>
+
+      <para></para>
+    </refsect2>
+  </refsect1>
+
+  <refsect1>
+    <title>Options</title>
+
+    <para>Path unit files may include [Unit] and [Install] sections, which are described in
+    <citerefentry><refentrytitle>systemd.unit</refentrytitle><manvolnum>5</manvolnum></citerefentry>.
+    </para>
+
+    <para>Path unit files must include a [Path] section, which carries information about the path or paths 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 similarly, 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>
+      <varlistentry>
+        <term><varname>TriggerLimitIntervalSec=</varname></term>
+        <term><varname>TriggerLimitBurst=</varname></term>
+
+        <listitem><para>Configures a limit on how often this path unit may be activated within a specific
+        time interval. The <varname>TriggerLimitIntervalSec=</varname> may be used to configure the length of
+        the time interval in the usual time units <literal>us</literal>, <literal>ms</literal>,
+        <literal>s</literal>, <literal>min</literal>, <literal>h</literal>, … and defaults to 2s. See
+        <citerefentry><refentrytitle>systemd.time</refentrytitle><manvolnum>7</manvolnum></citerefentry> for
+        details on the various time units understood. The <varname>TriggerLimitBurst=</varname> setting takes
+        a positive integer value and specifies the number of permitted activations per time interval, and
+        defaults to 200. Set either to 0 to disable any form of trigger rate limiting. If the limit is hit,
+        the unit is placed into a failure mode, and will not watch the paths anymore until restarted. Note
+        that this limit is enforced before the service activation is enqueued.</para></listitem>
+      </varlistentry>
+    </variablelist>
+
+    <xi:include href="systemd.service.xml" xpointer="shared-unit-options" />
+  </refsect1>
+
+  <refsect1>
+      <title>See Also</title>
+      <para>Environment variables with details on the trigger will be set for triggered units. See the
+      <literal>Environment Variables Set on Triggered Units</literal> section in
+      <citerefentry><refentrytitle>systemd.exec</refentrytitle><manvolnum>1</manvolnum></citerefentry>
+      for more details.</para>
+      <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>