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man: explicitly distinguish "implicit dependencies" and "default dependencies"

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Fixes: #6793
This commit is contained in:
John Lin
2017-09-13 11:39:09 +08:00
parent bbe0b4a8d5
commit 45f09f939b
15 changed files with 347 additions and 201 deletions
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man/systemd.timer.xml
+26 -12
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@@ -82,20 +82,34 @@
</refsect1>
<refsect1>
<title>Automatic Dependencies</title>
<title>Implicit Dependencies</title>
<para>Timer units automatically gain a <varname>Before=</varname>
dependency on the service they are supposed to activate.</para>
<para>The following dependencies are implicitly added:</para>
<para>Unless <varname>DefaultDependencies=</varname> in the <literal>[Unit]</literal> section is set to
<option>false</option>, all timer units will implicitly have dependencies of type <varname>Requires=</varname> and
<varname>After=</varname> on <filename>sysinit.target</filename>, a dependency of type <varname>Before=</varname>
on <filename>timers.target</filename>, as well as <varname>Conflicts=</varname> and <varname>Before=</varname> on
<filename>shutdown.target</filename> to ensure that they are stopped cleanly prior to system shutdown. Timer units
with at least one <varname>OnCalendar=</varname> directive will have an additional <varname>After=</varname>
dependency on <filename>time-sync.target</filename> to avoid being started before the system clock has been
correctly set. Only timer units involved with early boot or late system shutdown should disable the
<varname>DefaultDependencies=</varname> option.</para>
<itemizedlist>
<listitem><para>Timer units automatically gain a <varname>Before=</varname>
dependency on the service they are supposed to activate.</para></listitem>
</itemizedlist>
</refsect1>
<refsect1>
<title>Default Dependencies</title>
<para>The following dependencies are added unless <varname>DefaultDependencies=no</varname> is set:</para>
<itemizedlist>
<listitem><para>Timer units will automatically have dependencies of type <varname>Requires=</varname> and
<varname>After=</varname> on <filename>sysinit.target</filename>, a dependency of type <varname>Before=</varname>
on <filename>timers.target</filename>, as well as <varname>Conflicts=</varname> and <varname>Before=</varname> on
<filename>shutdown.target</filename> to ensure that they are stopped cleanly prior to system shutdown. Only timer
units involved with early boot or late system shutdown should disable the
<varname>DefaultDependencies=</varname> option.</para></listitem>
<listitem><para>Timer units
with at least one <varname>OnCalendar=</varname> directive will have an additional <varname>After=</varname>
dependency on <filename>time-sync.target</filename> to avoid being started before the system clock has been
correctly set.</para></listitem>
</itemizedlist>
</refsect1>
<refsect1>