Do not advertise .d snippets over main config file

For daemons which have a main configuration file, there's
little reason for the administrator to use configuration snippets.
They are useful for packagers which need to override settings, but
we shouldn't advertise that as the main way of configuring those
services.

https://bugs.freedesktop.org/show_bug.cgi?id=89397

9 files changed, 46 insertions, 25 deletions

diff --git a/man/bootchart.conf.xml b/man/bootchart.conf.xml
index 8d9700d30..bf6ca0bf9 100644
--- a/man/bootchart.conf.xml
+++ b/man/bootchart.conf.xml
@@ -68,8 +68,7 @@
     parameters and graph output.</para>
   </refsect1>
 
-  <xi:include href="standard-conf.xml" xpointer="confd" />
-  <xi:include href="standard-conf.xml" xpointer="conf" />
+  <xi:include href="standard-conf.xml" xpointer="main-conf" />
 
   <refsect1>
     <title>Options</title>
diff --git a/man/coredump.conf.xml b/man/coredump.conf.xml
index 3d325e6ad..0b7329bf5 100644
--- a/man/coredump.conf.xml
+++ b/man/coredump.conf.xml
@@ -63,8 +63,7 @@
     a handler for core dumps invoked by the kernel.</para>
   </refsect1>
 
-  <xi:include href="standard-conf.xml" xpointer="confd" />
-  <xi:include href="standard-conf.xml" xpointer="conf" />
+  <xi:include href="standard-conf.xml" xpointer="main-conf" />
 
   <refsect1>
     <title>Options</title>
diff --git a/man/journald.conf.xml b/man/journald.conf.xml
index 364b58f07..85146b0d8 100644
--- a/man/journald.conf.xml
+++ b/man/journald.conf.xml
@@ -64,8 +64,7 @@
 
   </refsect1>
 
-  <xi:include href="standard-conf.xml" xpointer="confd" />
-  <xi:include href="standard-conf.xml" xpointer="conf" />
+  <xi:include href="standard-conf.xml" xpointer="main-conf" />
 
   <refsect1>
     <title>Options</title>
diff --git a/man/logind.conf.xml b/man/logind.conf.xml
index ffaec5035..ca2b18783 100644
--- a/man/logind.conf.xml
+++ b/man/logind.conf.xml
@@ -58,11 +58,13 @@
   <refsect1>
     <title>Description</title>
 
-    <para>These files configure various parameters of the systemd login manager, <citerefentry><refentrytitle>systemd-logind.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>.</para>
+    <para>These files configure various parameters of the systemd
+    login manager,
+    <citerefentry><refentrytitle>systemd-logind.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>.
+    </para>
   </refsect1>
 
-  <xi:include href="standard-conf.xml" xpointer="confd" />
-  <xi:include href="standard-conf.xml" xpointer="conf" />
+  <xi:include href="standard-conf.xml" xpointer="main-conf" />
 
   <refsect1>
     <title>Options</title>
diff --git a/man/resolved.conf.xml b/man/resolved.conf.xml
index 36cae2706..8047a4ea7 100644
--- a/man/resolved.conf.xml
+++ b/man/resolved.conf.xml
@@ -63,8 +63,7 @@
 
   </refsect1>
 
-  <xi:include href="standard-conf.xml" xpointer="confd" />
-  <xi:include href="standard-conf.xml" xpointer="conf" />
+  <xi:include href="standard-conf.xml" xpointer="main-conf" />
 
   <refsect1>
     <title>Options</title>
diff --git a/man/standard-conf.xml b/man/standard-conf.xml
index b87d7e955..36af45927 100644
--- a/man/standard-conf.xml
+++ b/man/standard-conf.xml
@@ -33,13 +33,39 @@
     configuration file.</para>
   </refsection>
 
-  <refsection id='conf'>
-    <title>Configuration File</title>
-
-    <para>Configuration is also read from a single configuration file in
-    <filename>/etc/</filename>. This file is read before any of the
-    configuration directories, and has the lowest precedence; entries in a file
-    in any configuration directory override entries in the single configuration
-    file.</para>
+  <refsection id='main-conf'>
+    <title>Configuration Directories and Precedence</title>
+
+    <para>Default configuration is defined during compilation, so a
+    configuration file is only needed when it is necessary to deviate
+    from those defaults. By default the configuration file in
+    <filename>/etc/systemd/</filename> contains commented out entries
+    showing the defaults as a guide to the administrator. This file
+    can be edited to create local overrides.
+    </para>
+
+    <para>When packages need to customize the configuration, they can
+    install configuration snippets in
+    <filename>/usr/lib/systemd/*.conf.d/</filename>. Files in
+    <filename>/etc/</filename> are reserved for the local
+    administrator, who may use this logic to override the
+    configuration files installed by vendor packages. The main
+    configuration file is read before any of the configuration
+    directories, and has the lowest precedence; entries in a file in
+    any configuration directory override entries in the single
+    configuration file. Files in the
+    <filename>logind.conf.d/</filename> configuration subdirectories
+    are sorted by their filename in lexicographic order, regardless of
+    which of the subdirectories they reside in. If multiple files
+    specify the same option, the entry in the file with the
+    lexicographically latest name takes precedence.  It is recommended
+    to prefix all filenames in those subdirectories with a two-digit
+    number and a dash, to simplify the ordering of the files.</para>
+
+    <para>To disable a configuration file supplied by the vendor, the
+    recommended way is to place a symlink to
+    <filename>/dev/null</filename> in the configuration directory in
+    <filename>/etc/</filename>, with the same filename as the vendor
+    configuration file.</para>
   </refsection>
 </refsection>
diff --git a/man/systemd-sleep.conf.xml b/man/systemd-sleep.conf.xml
index 433f2f83a..bb17ec866 100644
--- a/man/systemd-sleep.conf.xml
+++ b/man/systemd-sleep.conf.xml
@@ -112,8 +112,7 @@ along with systemd; If not, see <http://www.gnu.org/licenses/>.
     attempts to suspend or hibernate the machine.</para>
   </refsect1>
 
-  <xi:include href="standard-conf.xml" xpointer="confd" />
-  <xi:include href="standard-conf.xml" xpointer="conf" />
+  <xi:include href="standard-conf.xml" xpointer="main-conf" />
 
   <refsect1>
     <title>Options</title>
diff --git a/man/systemd-system.conf.xml b/man/systemd-system.conf.xml
index 7c3f23756..c7bcfaee4 100644
--- a/man/systemd-system.conf.xml
+++ b/man/systemd-system.conf.xml
@@ -74,8 +74,7 @@
     operations.</para>
   </refsect1>
 
-  <xi:include href="standard-conf.xml" xpointer="confd" />
-  <xi:include href="standard-conf.xml" xpointer="conf" />
+  <xi:include href="standard-conf.xml" xpointer="main-conf" />
 
   <refsect1>
     <title>Options</title>
diff --git a/man/timesyncd.conf.xml b/man/timesyncd.conf.xml
index 1127970a1..89a651c66 100644
--- a/man/timesyncd.conf.xml
+++ b/man/timesyncd.conf.xml
@@ -63,8 +63,7 @@
 
   </refsect1>
 
-  <xi:include href="standard-conf.xml" xpointer="confd" />
-  <xi:include href="standard-conf.xml" xpointer="conf" />
+  <xi:include href="standard-conf.xml" xpointer="main-conf" />
 
   <refsect1>
     <title>Options</title>