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man: document nspawn's new credential switches

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Lennart Poettering 2020-07-23 17:43:18 +02:00
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man/systemd-nspawn.xml
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@ -1402,7 +1402,51 @@
<listitem><para>Equivalent to <option>--console=pipe</option>.</para></listitem>
</varlistentry>
</variablelist>
</refsect2><refsect2>
<title>Credentials</title>
<variablelist>
<varlistentry>
<term><option>--load-credential=</option><replaceable>ID</replaceable>:<replaceable>PATH</replaceable></term>
<term><option>--set-credential=</option><replaceable>ID</replaceable>:<replaceable>VALUE</replaceable></term>
<para>Pass a credential to the container. These two options correspond to the
<varname>LoadCredential=</varname> and <varname>SetCredential=</varname> settings in unit files. See
<citerefentry><refentrytitle>systemd.exec</refentrytitle><manvolnum>5</manvolnum></citerefentry> for
details about these concepts, as well as the syntax of the option's arguments.</para>
<para>Note:</para>
<orderedlist>
<listitem><para>When <command>systemd-nspawn</command> runs as systemd system service it can make
use and propagate credentials it received via
<varname>LoadCredential=</varname>/<varname>SetCredential=</varname> to the container
payload.</para></listitem>
<listitem><para>A systemd service manager running as PID 1 in the container can make use of
credentials passed in this way, and propagate them further to services it itself
runs.</para></listitem>
</orderedlist>
<para>Thus it is possible to easily propagate credentials from a host service manager to a
<command>systemd-nspawn</command> service and from there into its payload and services running within
it.</para>
<para>In order to embed binary data into
the credential data for <option>--set-credential=</option> use C-style escaping
(i.e. <literal>\n</literal> to embed a newline, or <literal>\x00</literal> to embed a NUL byte. Note
that the invoking shell might already apply unescaping once, hence this might require double
escaping!).</para>
</varlistentry>
</variablelist>
</refsect2><refsect2>
<title>Other</title>
<variablelist>
<xi:include href="standard-options.xml" xpointer="no-pager" />
<xi:include href="standard-options.xml" xpointer="help" />
<xi:include href="standard-options.xml" xpointer="version" />