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man: add documents for TemporaryFileSystem=

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Yu Watanabe 2018-02-21 09:10:27 +09:00
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commit c10b460b5a
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man/systemd.exec.xml
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@ -932,6 +932,29 @@ CapabilityBoundingSet=~CAP_B CAP_C</programlisting>
<varname>SystemCallFilter=~@mount</varname>.</para></listitem>
</varlistentry>
<varlistentry>
<term><varname>TemporaryFileSystem=</varname></term>
<listitem><para>Takes a space-separated list of mount points for temporary file systems (tmpfs). If set, a new file
system namespace is set up for executed processes, and a temporary file system is mounted on each mount point.
This option may be specified more than once, in which case temporary file systems are mounted on all listed mount
points. If the empty string is assigned to this option, the list is reset, and all prior assignments have no effect.
Each mount point may optionally be suffixed with a colon (<literal>:</literal>) and mount options such as
<literal>size=10%</literal> or <literal>ro</literal>. By default, each temporary file system is mounted
with <literal>nodev,strictatime,mode=0755</literal>. These can be disabled by explicitly specifying the corresponding
mount options, e.g., <literal>dev</literal> or <literal>nostrictatime</literal>.</para>
<para>This is useful to hide files or directories not relevant to the processes invoked by the unit, while necessary
files or directories can be still accessed by combining with <varname>BindPaths=</varname> or
<varname>BindReadOnlyPaths=</varname>. See the example below.</para>
<para>Example: if a unit has the following,
<programlisting>TemporaryFileSystem=/var:ro
BindReadOnlyPaths=/var/lib/systemd</programlisting>
then the invoked processes by the unit cannot see any files or directories under <filename>/var</filename> except for
<filename>/var/lib/systemd</filename> or its contents.</para></listitem>
</varlistentry>
<varlistentry>
<term><varname>PrivateTmp=</varname></term>