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+<?xml version='1.0'?> <!--*- Mode: nxml; nxml-child-indent: 2; indent-tabs-mode: nil -*-->
+<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN"
+ "http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
+
+<!--
+ This file is part of systemd.
+
+ Copyright 2012 Lennart Poettering
+
+ systemd is free software; you can redistribute it and/or modify it
+ under the terms of the GNU Lesser General Public License as published by
+ the Free Software Foundation; either version 2.1 of the License, or
+ (at your option) any later version.
+
+ systemd is distributed in the hope that it will be useful, but
+ WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public License
+ along with systemd; If not, see <http://www.gnu.org/licenses/>.
+-->
+
+<refentry id="systemd-machine-id-setup"
+ xmlns:xi="http://www.w3.org/2001/XInclude">
+
+ <refentryinfo>
+ <title>systemd-machine-id-setup</title>
+ <productname>systemd</productname>
+
+ <authorgroup>
+ <author>
+ <contrib>Developer</contrib>
+ <firstname>Lennart</firstname>
+ <surname>Poettering</surname>
+ <email>lennart@poettering.net</email>
+ </author>
+ <author>
+ <contrib>Developer</contrib>
+ <firstname>Didier</firstname>
+ <surname>Roche</surname>
+ <email>didrocks@ubuntu.com</email>
+ </author>
+ </authorgroup>
+ </refentryinfo>
+
+ <refmeta>
+ <refentrytitle>systemd-machine-id-setup</refentrytitle>
+ <manvolnum>1</manvolnum>
+ </refmeta>
+
+ <refnamediv>
+ <refname>systemd-machine-id-setup</refname>
+ <refpurpose>Initialize the machine ID in /etc/machine-id</refpurpose>
+ </refnamediv>
+
+ <refsynopsisdiv>
+ <cmdsynopsis>
+ <command>systemd-machine-id-setup</command>
+ </cmdsynopsis>
+ </refsynopsisdiv>
+
+ <refsect1>
+ <title>Description</title>
+
+ <para><command>systemd-machine-id-setup</command> may be used by
+ system installer tools to initialize the machine ID stored in
+ <filename>/etc/machine-id</filename> at install time, with a
+ provisioned or randomly generated ID. See
+ <citerefentry><refentrytitle>machine-id</refentrytitle><manvolnum>5</manvolnum></citerefentry>
+ for more information about this file.</para>
+
+ <para>If the tool is invoked without the <option>--commit</option>
+ switch, <filename>/etc/machine-id</filename> is initialized with a
+ valid, new machined ID if it is missing or empty. The new machine
+ ID will be acquired in the following fashion:</para>
+
+ <orderedlist>
+ <listitem><para>If a valid D-Bus machine ID is already
+ configured for the system, the D-Bus machine ID is copied and
+ used to initialize the machine ID in
+ <filename>/etc/machine-id</filename>.</para></listitem>
+
+ <listitem><para>If run inside a KVM virtual machine and a UUID
+ is was configured (via the <option>-uuid</option>
+ option), this UUID is used to initialize the machine ID. The
+ caller must ensure that the UUID passed is sufficiently unique
+ and is different for every booted instance of the
+ VM.</para></listitem>
+
+ <listitem><para>Similarly, if run inside a Linux container
+ environment and a UUID is configured for the container, this is
+ used to initialize the machine ID. For details, see the
+ documentation of the <ulink
+ url="http://www.freedesktop.org/wiki/Software/systemd/ContainerInterface">Container
+ Interface</ulink>.</para></listitem>
+
+ <listitem><para>Otherwise, a new ID is randomly
+ generated.</para></listitem>
+ </orderedlist>
+
+ <para>The <option>--commit</option> switch may be used to commit a
+ transient machined ID to disk, making it persistent. For details,
+ see below.</para>
+
+ <para>Use
+ <citerefentry><refentrytitle>systemd-firstboot</refentrytitle><manvolnum>1</manvolnum></citerefentry>
+ to initialize the machine ID on mounted (but not booted) system
+ images.</para>
+
+ </refsect1>
+
+ <refsect1>
+ <title>Options</title>
+
+ <para>The following options are understood:</para>
+
+ <variablelist>
+
+ <varlistentry>
+ <term><option>--root=<replaceable>root</replaceable></option></term>
+ <listitem><para>Takes a directory path as argument. All paths
+ operated will be prefixed with the given alternate
+ <replaceable>root</replaceable> path, including the path for
+ <filename>/etc/machine-id</filename> itself.</para></listitem>
+ </varlistentry>
+
+ <varlistentry>
+ <term><option>--commit</option></term>
+ <listitem><para>Commit a transient machine ID to disk. This
+ command may be used to convert a transient machine ID into a
+ persistent one. A transient machine ID file is one that was
+ bind mounted from a memory file system (usually
+ <literal>tmpfs</literal>) to
+ <filename>/etc/machine-id</filename> during the early phase of
+ the boot process. This may happen because
+ <filename>/etc</filename> is initially read-only and was
+ missing a valid machine ID file at that point.</para>
+
+ <para>This command will execute no operation if
+ <filename>/etc/machine-id</filename> is not mounted from a
+ memory file system, or if <filename>/etc</filename> is
+ read-only. The command will write the current transient
+ machine ID to disk and unmount the
+ <filename>/etc/machine-id</filename> mount point in a
+ race-free manner to ensure that this file is always valid and
+ accessible for other processes.</para>
+
+ <para>This command is primarily used by the
+ <citerefentry><refentrytitle>systemd-machine-id-commit.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>
+ early boot service.</para></listitem>
+ </varlistentry>
+
+ <varlistentry>
+ <term><option>--print</option></term>
+
+ <listitem><para>Print the machine ID generated or commited after the operation is complete.</para></listitem>
+ </varlistentry>
+
+ <xi:include href="standard-options.xml" xpointer="help" />
+ <xi:include href="standard-options.xml" xpointer="version" />
+ </variablelist>
+
+ </refsect1>
+
+ <refsect1>
+ <title>Exit status</title>
+
+ <para>On success, 0 is returned, a non-zero failure code
+ otherwise.</para>
+ </refsect1>
+
+ <refsect1>
+ <title>See Also</title>
+ <para>
+ <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
+ <citerefentry><refentrytitle>machine-id</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
+ <citerefentry><refentrytitle>systemd-machine-id-commit.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
+ <citerefentry project='dbus'><refentrytitle>dbus-uuidgen</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
+ <citerefentry><refentrytitle>systemd-firstboot</refentrytitle><manvolnum>1</manvolnum></citerefentry>
+ </para>
+ </refsect1>
+
+</refentry>