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man: document distinction between ConditionXYZ= and AssertXYZ=

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References: #2468
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Lennart Poettering 2016-02-10 21:30:25 +01:00
parent 6e004630fe
commit 41448597f2
1 changed files with 14 additions and 15 deletions
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29
man/systemd.unit.xml
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@ -827,13 +827,14 @@
useful and probably just
confusing. -->
<listitem><para>Before starting a unit verify that the
specified condition is true. If it is not true, the starting
of the unit will be skipped, however all ordering dependencies
of it are still respected. A failing condition will not result
in the unit being moved into a failure state. The condition is
checked at the time the queued start job is to be
executed.</para>
<listitem><para>Before starting a unit, verify that the specified condition is true. If it is not true, the
starting of the unit will be (mostly silently) skipped, however all ordering dependencies of it are still
respected. A failing condition will not result in the unit being moved into a failure state. The condition is
checked at the time the queued start job is to be executed. Use condition expressions in order to silently skip
units that do not apply to the local running system, for example because the kernel or runtime environment
doesn't require its functionality. Use the various <varname>AssertArchitecture=</varname>,
<varname>AssertVirtualization=</varname>, … options for a similar mechanism that puts the unit in a failure
state and logs about the failed check (see below).</para>
<para><varname>ConditionArchitecture=</varname> may be used to
check whether the system is running on a specific
@ -1067,14 +1068,12 @@
<term><varname>AssertFileNotEmpty=</varname></term>
<term><varname>AssertFileIsExecutable=</varname></term>
<listitem><para>Similar to the
<varname>ConditionArchitecture=</varname>,
<varname>ConditionVirtualization=</varname>, etc., condition
settings described above, these settings add assertion checks
to the start-up of the unit. However, unlike the conditions
settings, any assertion setting that is not met results in
failure of the start job it was triggered
by.</para></listitem>
<listitem><para>Similar to the <varname>ConditionArchitecture=</varname>,
<varname>ConditionVirtualization=</varname>, …, condition settings described above, these settings add
assertion checks to the start-up of the unit. However, unlike the conditions settings, any assertion setting
that is not met results in failure of the start job it was triggered by (which means this is logged about
loudly). Use assertion expressions for units that cannot operate when specific requirements are not met, and
where this is something the administrator or user should look into.</para></listitem>
</varlistentry>
<varlistentry>