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11a1589223
Files which are installed as-is (any .service and other unit files, .conf files, .policy files, etc), are left as is. My assumption is that SPDX identifiers are not yet that well known, so it's better to retain the extended header to avoid any doubt. I also kept any copyright lines. We can probably remove them, but it'd nice to obtain explicit acks from all involved authors before doing that.
85 lines
3.2 KiB
XML
85 lines
3.2 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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SPDX-License-Identifier: LGPL-2.1+
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This file is part of systemd.
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Copyright 2014 Didier Roche
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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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