man: document automatic dependencies

For all units ensure there's an "Automatic Dependencies" section in the
man page, and explain which dependencies are automatically added in all
cases, and which ones are added on top if DefaultDependencies=yes is
set.

This is also done for systemd.exec(5), systemd.resource-control(5) and
systemd.unit(5) as these pages describe common behaviour of various unit
types.

1 files changed, 34 insertions, 15 deletions

diff --git a/man/systemd.service.xml b/man/systemd.service.xml
index 4e5098f0e1..c6ed75d158 100644
--- a/man/systemd.service.xml
+++ b/man/systemd.service.xml
@@ -1,4 +1,4 @@
-<?xml version='1.0'?> <!--*-nxml-*-->
+<?xml version='1.0'?> <!--*- Mode: nxml; nxml-child-indent: 2; indent-tabs-mode: nil -*-->
 <!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN"
   "http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
 
@@ -77,18 +77,6 @@
     which configure resource control settings for the processes of the
     service.</para>
 
-    <para>Unless <varname>DefaultDependencies=</varname> is set to
-    <option>false</option>, service units will implicitly have
-    dependencies of type <varname>Requires=</varname> and
-    <varname>After=</varname> on <filename>basic.target</filename> as
-    well as dependencies of type <varname>Conflicts=</varname> and
-    <varname>Before=</varname> on
-    <filename>shutdown.target</filename>. These ensure that normal
-    service units pull in basic system initialization, and are
-    terminated cleanly prior to system shutdown. Only services
-    involved with early boot or late system shutdown should disable
-    this option.</para>
-
     <para>If a service is requested under a certain name but no unit
     configuration file is found, systemd looks for a SysV init script
     by the same name (with the <filename>.service</filename> suffix
@@ -97,8 +85,39 @@
     compatibility is quite comprehensive but not 100%. For details
     about the incompatibilities, see the <ulink
     url="http://www.freedesktop.org/wiki/Software/systemd/Incompatibilities">Incompatibilities
-    with SysV</ulink> document.
-    </para>
+    with SysV</ulink> document.</para>
+  </refsect1>
+
+  <refsect1>
+    <title>Automatic Dependencies</title>
+
+    <para>Services with <varname>Type=dbus</varname> set automatically
+    acquire dependencies of type <varname>Requires=</varname> and
+    <varname>After=</varname> on
+    <filename>dbus.socket</filename>.</para>
+
+    <para>Socket activated service are automatically ordered after
+    their activated <filename>.socket</filename> units via an
+    automatic <varname>After=</varname> dependency.</para>
+
+    <para>Unless <varname>DefaultDependencies=</varname> is set to
+    <option>false</option>, service units will implicitly have
+    dependencies of type <varname>Requires=</varname> and
+    <varname>After=</varname> on <filename>sysinit.target</filename>,
+    a dependency of type <varname>After=</varname> on
+    <filename>basic.target</filename> as well as dependencies of
+    type <varname>Conflicts=</varname> and <varname>Before=</varname>
+    on <filename>shutdown.target</filename>. These ensure that normal
+    service units pull in basic system initialization, and are
+    terminated cleanly prior to system shutdown. Only services
+    involved with early boot or late system shutdown should disable
+    this option.</para>
+
+    <para>Additional implicit dependencies may be added as result of
+    execution and resource control parameters as documented in
+    <citerefentry><refentrytitle>systemd.exec</refentrytitle><manvolnum>5</manvolnum></citerefentry>
+    and
+    <citerefentry><refentrytitle>systemd.resource-control</refentrytitle><manvolnum>5</manvolnum></citerefentry>.</para>
   </refsect1>
 
   <refsect1>