From: Lennart Poettering <lennart@poettering.net>
Date: Fri, 2 Jul 2010 00:38:30 +0000 (+0200)
Subject: man: document path units
X-Git-Tag: v1~71
X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?p=elogind.git;a=commitdiff_plain;h=b36b082c8a24d2575909c3e0b4b8aeec49ec17bb

man: document path units
---

diff --git a/Makefile.am b/Makefile.am
index 2e001a64b..aa60784a3 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -322,6 +322,7 @@ MANPAGES = \
 	man/systemd.automount.5 \
 	man/systemd.swap.5 \
 	man/systemd.timer.5 \
+	man/systemd.path.5 \
 	man/daemon.7 \
 	man/sd-daemon.7 \
 	man/runlevel.8 \
diff --git a/man/systemd.mount.xml b/man/systemd.mount.xml
index bb969bb4e..7be7d4938 100644
--- a/man/systemd.mount.xml
+++ b/man/systemd.mount.xml
@@ -88,6 +88,11 @@
                 <para>If an mount point is beneath another mount point
                 in the file system hierarchy a dependency between both
                 units is created automatically.</para>
+
+                <para>Mount points created at runtime independent on
+                unit files or <filename>/etc/fstab</filename> will be
+                monitored by systemd and appear like any other mount
+                unit in systemd.</para>
         </refsect1>
 
         <refsect1>
diff --git a/man/systemd.path.xml b/man/systemd.path.xml
new file mode 100644
index 000000000..44f536cfc
--- /dev/null
+++ b/man/systemd.path.xml
@@ -0,0 +1,174 @@
+<?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">
+
+<!--
+  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 General Public License as published by
+  the Free Software Foundation; either version 2 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
+  General Public License for more details.
+
+  You should have received a copy of the GNU 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>systemd path configuration files</refpurpose>
+        </refnamediv>
+
+        <refsynopsisdiv>
+                <para><filename>systemd.path</filename></para>
+        </refsynopsisdiv>
+
+        <refsect1>
+                <title>Description</title>
+
+                <para>A unit configuration file whose name ends in
+                <filename>.path</filename> 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><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 an path unit is beneath another mount
+                point in the file system hierarchy a dependency
+                between both units is created automatically.</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>
+                        <varlistentry>
+                                <term><varname>PathExists=</varname></term>
+                                <term><varname>PathChanged=</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 existance of a
+                                file or directory. If the file
+                                specified exists the configured unit
+                                is
+                                activated. <varname>PathChanged=</varname>
+                                may be used to watch a file or
+                                directory and activate the configured
+                                unit whenever it changes or is
+                                modified. <varname>DirectoryNotEmpty=</varname>
+                                may be used to watch a directory and
+                                activate the configured unit whenver
+                                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.</para>
+
+                                <para>If a path is already existing
+                                (in case of
+                                <varname>PathExists=</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>.
+                                </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
+                                <filename>.path</filename>. 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 is chosen
+                                identical except for the
+                                suffix.</para></listitem>
+                        </varlistentry>
+                </variablelist>
+        </refsect1>
+
+        <refsect1>
+                  <title>See Also</title>
+                  <para>
+                          <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
+                          <citerefentry><refentrytitle>systemctl</refentrytitle><manvolnum>8</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>
+                  </para>
+        </refsect1>
+
+</refentry>
diff --git a/man/systemd.timer.xml b/man/systemd.timer.xml
index b61cabc3e..5845383e8 100644
--- a/man/systemd.timer.xml
+++ b/man/systemd.timer.xml
@@ -153,7 +153,7 @@
                                 <term><varname>Unit=</varname></term>
 
                                 <listitem><para>The unit to activate
-                                when this timer elapses. Argument is a
+                                when this timer elapses. The argument is a
                                 unit name, whose suffix is not
                                 <filename>.timer</filename>. If not
                                 specified this value defaults to a