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man: document ConditionNeedsUpdate=

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Lennart Poettering
2014-07-01 01:33:56 +02:00
parent 82a30aae48
commit cdf0c7abf8
1 changed files with 28 additions and 0 deletions
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man/systemd.unit.xml
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@@ -900,6 +900,7 @@
<term><varname>ConditionSecurity=</varname></term>
<term><varname>ConditionCapability=</varname></term>
<term><varname>ConditionACPower=</varname></term>
<term><varname>ConditionNeedsUpdate=</varname></term>
<term><varname>ConditionPathExists=</varname></term>
<term><varname>ConditionPathExistsGlob=</varname></term>
<term><varname>ConditionPathIsDirectory=</varname></term>
@@ -1068,6 +1069,33 @@
all AC connectors are disconnected
from a power source.</para>
<para><varname>ConditionNeedsUpdate=</varname>
takes one of <filename>/var</filename>
or <filename>/etc</filename> as
argument, possibly prefixed with a
<literal>!</literal> (for inverting
the condition). This condition may be
used to conditionalize units on
whether the specified directory
requires an update because
<filename>/usr</filename>'s
modification time is newer than the
stamp file
<filename>.updated</filename> in the
specified directory. This is useful to
implement offline updates of the
vendor operating system resources in
<filename>/usr</filename> that require
updating of <filename>/etc</filename>
or <filename>/var</filename> on the
next following boot. Units making use
of this condition should order
themselves before
<citerefentry><refentrytitle>systemd-update-done.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
to make sure they run before the stamp
files's modification time gets reset
indicating a completed update.</para>
<para>With
<varname>ConditionPathExists=</varname>
a file existence condition is