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, 24 insertions, 10 deletions

diff --git a/man/systemd.swap.xml b/man/systemd.swap.xml
index bc9ef826e1..c600405c87 100644
--- a/man/systemd.swap.xml
+++ b/man/systemd.swap.xml
@@ -68,14 +68,15 @@
 
     <para>Additional options are listed in
     <citerefentry><refentrytitle>systemd.exec</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
-    which define the execution environment the
-    <citerefentry project='man-pages'><refentrytitle>swapon</refentrytitle><manvolnum>8</manvolnum></citerefentry>
-    binary is executed in, and in
+    which define the execution environment the <citerefentry
+    project='man-pages'><refentrytitle>swapon</refentrytitle><manvolnum>8</manvolnum></citerefentry>
+    binary is executed in, in
     <citerefentry><refentrytitle>systemd.kill</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
-    which define the way the processes are terminated, and in
+    which define the way the these processes are
+    terminated, and in
     <citerefentry><refentrytitle>systemd.resource-control</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
-    which configure resource control settings for the processes of the
-    service.</para>
+    which configure resource control settings for these processes of the
+    unit.</para>
 
     <para>Swap units must be named after the devices
     or files they control. Example: the swap device
@@ -84,15 +85,28 @@
     the escaping logic used to convert a file system path to a unit
     name, see
     <citerefentry><refentrytitle>systemd.unit</refentrytitle><manvolnum>5</manvolnum></citerefentry>.</para>
+  </refsect1>
+
+  <refsect1>
+    <title>Automatic Dependencies</title>
 
-    <para>All swap units automatically get the appropriate
-    dependencies on the devices or on the mount points of the files
+    <para>All swap units automatically get the
+    <varname>BindsTo=</varname> and <varname>After=</varname>
+    dependencies on the device units or the mount units of the files
     they are activated from.</para>
 
     <para>Swap units with <varname>DefaultDependencies=</varname>
-    enabled implicitly acquire a conflicting dependency to
+    enabled implicitly acquire a <varname>Conflicts=</varname> and an
+    <varname>After=</varname> dependency on
     <filename>umount.target</filename> so that they are deactivated at
-    shutdown.</para>
+    shutdown, unless <varname>DefaultDependencies=no</varname> is
+    specified.</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>