4a9b1dd4ad
And remove machine-id-commit as separate binary. There's really no point in keeping this separate, as the sources are pretty much identical, and have pretty identical interfaces. Let's unify this in one binary. Given that machine-id-commit was a private binary of systemd (shipped in /usr/lib/) removing the tool is not an API break. While we are at it, improve the documentation of the command substantially.
96 lines
3.8 KiB
XML
96 lines
3.8 KiB
XML
<?xml version="1.0"?>
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<!--*-nxml-*-->
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<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN" "http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
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<!--
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This file is part of systemd.
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Copyright 2014 Didier Roche
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systemd is free software; you can redistribute it and/or modify it
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under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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systemd is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with systemd; If not, see <http://www.gnu.org/licenses/>.
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-->
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<refentry id="systemd-machine-id-commit.service">
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<refentryinfo>
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<title>systemd-machine-id-commit.service</title>
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<productname>systemd</productname>
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<authorgroup>
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<author>
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<contrib>Developer</contrib>
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<firstname>Didier</firstname>
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<surname>Roche</surname>
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<email>didrocks@ubuntu.com</email>
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</author>
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</authorgroup>
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</refentryinfo>
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<refmeta>
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<refentrytitle>systemd-machine-id-commit.service</refentrytitle>
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<manvolnum>8</manvolnum>
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</refmeta>
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<refnamediv>
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<refname>systemd-machine-id-commit.service</refname>
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<refpurpose>Commit a transient machine-id to disk</refpurpose>
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</refnamediv>
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<refsynopsisdiv>
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<para><filename>systemd-machine-id-commit.service</filename></para>
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</refsynopsisdiv>
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<refsect1>
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<title>Description</title>
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<para><filename>systemd-machine-id-commit.service</filename> is an
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early-boot service responsible for committing transient
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<filename>/etc/machine-id</filename> files to a writable disk file
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system. See
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<citerefentry><refentrytitle>machine-id</refentrytitle><manvolnum>5</manvolnum></citerefentry>
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for more information about machine IDs.</para>
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<para>This service is started after
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<filename>local-fs.target</filename> in case
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<filename>/etc/machine-id</filename> is a mount point of its own
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(usually from a memory file system such as
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<literal>tmpfs</literal>) and /etc is writable. The service will
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invoke <command>systemd-machine-id-setup --commit</command>, which
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writes the current transient machine ID to disk and unmount the
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<filename>/etc/machine-id</filename> file in a race-free manner to
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ensure that file is always valid and accessible for other
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processes. See
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<citerefentry><refentrytitle>systemd-machine-id-setup</refentrytitle><manvolnum>1</manvolnum></citerefentry>
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for details.</para>
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<para>The main use case of this service are systems where
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<filename>/etc/machine-id</filename> is read-only and initially
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not initialized. In this case the system manager will generate a
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transient machine ID file on a memory file system, and mount it
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over <filename>/etc/machine-id</filename>, during the early boot
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phase. This service is then invoked in a later boot phase, as soon
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as <filename>/etc</filename> has been remounted writable and the
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ID may thus be committed to disk to make it permanent.</para>
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</refsect1>
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<refsect1>
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<title>See Also</title>
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<para>
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<citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>systemd-machine-id-setup</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>machine-id</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>systemd-firstboot</refentrytitle><manvolnum>1</manvolnum></citerefentry>
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</para>
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</refsect1>
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</refentry>
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