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* mandos (daemon): Use "os.path.devnull" in the error message.

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plugin-runner.xml
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<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
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        "http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd" [
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<!ENTITY COMMANDNAME "plugin-runner">
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<!ENTITY TIMESTAMP "2016-03-05">
 
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<!ENTITY TIMESTAMP "2009-01-17">
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<!ENTITY % common SYSTEM "common.ent">
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%common;
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]>
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        <firstname>Björn</firstname>
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        <surname>Påhlsson</surname>
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        <address>
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          <email>belorn@recompile.se</email>
 
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          <email>belorn@fukt.bsnet.se</email>
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        </address>
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      </author>
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      <author>
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        <firstname>Teddy</firstname>
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        <surname>Hogeborn</surname>
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        <address>
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          <email>teddy@recompile.se</email>
 
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          <email>teddy@fukt.bsnet.se</email>
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        </address>
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      </author>
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    </authorgroup>
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    <copyright>
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      <year>2008</year>
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      <year>2009</year>
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      <year>2010</year>
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      <year>2011</year>
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      <year>2012</year>
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      <year>2013</year>
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      <year>2014</year>
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      <year>2015</year>
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      <year>2016</year>
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      <holder>Teddy Hogeborn</holder>
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      <holder>Björn Påhlsson</holder>
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    </copyright>
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      <arg><option>--plugin-dir=<replaceable
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      >DIRECTORY</replaceable></option></arg>
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      <sbr/>
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      <arg><option>--plugin-helper-dir=<replaceable
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      >DIRECTORY</replaceable></option></arg>
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      <sbr/>
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      <arg><option>--config-file=<replaceable
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      >FILE</replaceable></option></arg>
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      <sbr/>
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            Disable the plugin named
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            <replaceable>PLUGIN</replaceable>.  The plugin will not be
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            started.
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          </para>
 
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          </para>       
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        </listitem>
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      </varlistentry>
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      </varlistentry>
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      <varlistentry>
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        <term><option>--plugin-helper-dir
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        <replaceable>DIRECTORY</replaceable></option></term>
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        <listitem>
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          <para>
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            Specify a different plugin helper directory.  The default
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            is <filename>/lib/mandos/plugin-helpers</filename>, which
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            will exist in the initial <acronym>RAM</acronym> disk
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            environment.  (This will simply be passed to all plugins
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            via the <envar>MANDOSPLUGINHELPERDIR</envar> environment
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            variable.  See <xref linkend="writing_plugins"/>)
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          </para>
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        </listitem>
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      </varlistentry>
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      <varlistentry>
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        <term><option>--config-file
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        <replaceable>FILE</replaceable></option></term>
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        <listitem>
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      <para>
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        The plugin will run in the initial RAM disk environment, so
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        care must be taken not to depend on any files or running
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        services not available there.  Any helper executables required
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        by the plugin (which are not in the <envar>PATH</envar>) can
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        be placed in the plugin helper directory, the name of which
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        will be made available to the plugin via the
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        <envar>MANDOSPLUGINHELPERDIR</envar> environment variable.
 
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        services not available there.
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      </para>
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      <para>
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        The plugin must exit cleanly and free all allocated resources
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      only passes on its environment to all the plugins.  The
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      environment passed to plugins can be modified using the
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      <option>--global-env</option> and <option>--env-for</option>
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      options.  Also, the <option>--plugin-helper-dir</option> option
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      will affect the environment variable
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      <envar>MANDOSPLUGINHELPERDIR</envar> for the plugins.
 
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      options.
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    </para>
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  </refsect1>
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      The <option>--config-file</option> option is ignored when
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      specified from within a configuration file.
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    </para>
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    <xi:include href="bugs.xml"/>
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  </refsect1>
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  <refsect1 id="examples">
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    </informalexample>
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    <informalexample>
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      <para>
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        Read a different configuration file, run plugins from a
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        different directory, specify an alternate plugin helper
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        directory and add two options to the
 
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        Run plugins from a different directory, read a different
 
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        configuration file, and add two options to the
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        <citerefentry><refentrytitle >mandos-client</refentrytitle>
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        <manvolnum>8mandos</manvolnum></citerefentry> plugin:
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      </para>
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      <para>
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<!-- do not wrap this line -->
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<userinput>cd /etc/keys/mandos; &COMMANDNAME;  --config-file=/etc/mandos/plugin-runner.conf --plugin-dir /usr/lib/x86_64-linux-gnu/mandos/plugins.d --plugin-helper-dir /usr/lib/x86_64-linux-gnu/mandos/plugin-helpers --options-for=mandos-client:--pubkey=pubkey.txt,--seckey=seckey.txt</userinput>
 
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<userinput>cd /etc/keys/mandos; &COMMANDNAME;  --config-file=/etc/mandos/plugin-runner.conf --plugin-dir /usr/lib/mandos/plugins.d --options-for=mandos-client:--pubkey=pubkey.txt,--seckey=seckey.txt</userinput>
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      </para>
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    </informalexample>
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  <refsect1 id="see_also">
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    <title>SEE ALSO</title>
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    <para>
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      <citerefentry><refentrytitle>intro</refentrytitle>
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      <manvolnum>8mandos</manvolnum></citerefentry>,
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      <citerefentry><refentrytitle>cryptsetup</refentrytitle>
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      <manvolnum>8</manvolnum></citerefentry>,
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      <citerefentry><refentrytitle>crypttab</refentrytitle>