units: properly terminate readahead collection 10s after boot

[elogind.git] / man / daemon.xml

diff --git a/man/daemon.xml b/man/daemon.xml
index 30d39d7be11eeaa177cfc17d95f74783969eee2e..dac244ca4e8abbfd4459d36fbd2b72cefd2927be 100644 (file)
--- a/man/daemon.xml
+++ b/man/daemon.xml
@@ -449,7 +449,7 @@
                         activation of daemons. However, the primary
                         advantage of this scheme is that all providers
                         and all consumers of the sockets can be
-                        started in parallel as soon als all sockets
+                        started in parallel as soon as all sockets
                         are established. In addition to that daemons
                         can be restarted with losing only a minimal
                         number of client transactions or even any
@@ -826,22 +826,26 @@ endif</programlisting>
 
                         <programlisting>%post
 if [ $1 -eq 1 ]; then
-        # Enable (but don't start) the units by default
+        # On install, enable (but don't start) the units by default
         /bin/systemctl enable foobar.service foobar.socket >/dev/null 2>&amp;1 || :
+
+        # Alternatively, just call /bin/systemctl daemon-reload here,
+        # if the daemon should not be enabled by default on package
+        # installation
 fi
 
 %preun
 if [ $1 -eq 0 ]; then
-        # Disable and stop the units
+        # On uninstall, disable and stop the units
         /bin/systemctl disable foobar.service foobar.socket >/dev/null 2>&amp;1 || :
         /bin/systemctl stop foobar.service foobar.socket >/dev/null 2>&amp;1 || :
 fi
 
 %postun
+# On upgrade and uninstall, reload init system configuration, to make systemd honour changed unit files
+/bin/systemctl daemon-reload >/dev/null 2>&amp;1 || :
 if [ $1 -ge 1 ] ; then
-        # On upgrade, reload init system configuration if we changed unit files
-        /bin/systemctl daemon-reload >/dev/null 2>&amp;1 || :
-        # On upgrade, restart the daemon
+        # Optionally, on upgrade, restart the daemon
         /bin/systemctl try-restart foobar.service >/dev/null 2>&amp;1 || :
 fi</programlisting>
 
@@ -853,6 +857,29 @@ fi</programlisting>
                         <citerefentry><refentrytitle>systemctl</refentrytitle><manvolnum>1</manvolnum></citerefentry>
                         for details.</para>
 
+                        <para>To facilitate upgrades from a package
+                        version that shipped only SysV init scripts to
+                        a package version that ships both a SysV init
+                        script and a native systemd service file, use
+                        a fragment like the following:</para>
+
+                        <programlisting>%triggerun -- foobar &lt; 0.47.11-1
+if /sbin/chkconfig foobar ; then
+        /bin/systemctl enable foobar.service foobar.socket >/dev/null 2>&amp;1 || :
+fi</programlisting>
+
+                        <para>Where 0.47.11-1 is the first package
+                        version that includes the native unit
+                        file. This fragment will ensure that the first
+                        time the unit file is installed it will be
+                        enabled if and only if the SysV init script is
+                        enabled, thus making sure that the enable
+                        status is not changed. Note that
+                        <command>chkconfig</command> is a command
+                        specific to Fedora which can be used to check
+                        whether a SysV init script is enabled. Other
+                        operating systems will have to use different
+                        commands here.</para>
                 </refsect2>
         </refsect1>