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78266a54f1
Most of our kernel cmdline options use underscores as word separators in kernel cmdline options, but there were some exceptions. Let's fix those, and also use underscores. Since our /proc/cmdline parsers don't distinguish between the two characters anyway this should not break anything, but makes sure our own codebase (and in particular docs and log messages) are internally consistent.
77 lines
3.4 KiB
XML
77 lines
3.4 KiB
XML
<?xml version="1.0"?>
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<!--*-nxml-*-->
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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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<!-- SPDX-License-Identifier: LGPL-2.1-or-later -->
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<refentry id="systemd-update-done.service">
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<refentryinfo>
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<title>systemd-update-done.service</title>
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<productname>systemd</productname>
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</refentryinfo>
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<refmeta>
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<refentrytitle>systemd-update-done.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-update-done.service</refname>
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<refname>systemd-update-done</refname>
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<refpurpose>Mark <filename>/etc/</filename> and <filename>/var/</filename> fully updated</refpurpose>
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</refnamediv>
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<refsynopsisdiv>
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<para><filename>systemd-update-done.service</filename></para>
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<para><filename>/usr/lib/systemd/systemd-update-done</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-update-done.service</filename> is a
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service that is invoked as part of the first boot after the vendor
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operating system resources in <filename>/usr/</filename> have been
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updated. This is useful to implement offline updates of
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<filename>/usr/</filename> which might require updates to
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<filename>/etc/</filename> or <filename>/var/</filename> on the
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following boot.</para>
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<para><filename>systemd-update-done.service</filename> updates the
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file modification time (mtime) of the stamp files
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<filename>/etc/.updated</filename> and
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<filename>/var/.updated</filename> to the modification time of the
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<filename>/usr/</filename> directory, unless the stamp files are
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already newer.</para>
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<para>Services that shall run after offline upgrades of
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<filename>/usr/</filename> should order themselves before
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<filename>systemd-update-done.service</filename>, and use the
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<varname>ConditionNeedsUpdate=</varname> (see
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<citerefentry><refentrytitle>systemd.unit</refentrytitle><manvolnum>5</manvolnum></citerefentry>)
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condition to make sure to run when <filename>/etc/</filename> or
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<filename>/var/</filename> are older than <filename>/usr/</filename>
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according to the modification times of the files described above.
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This requires that updates to <filename>/usr/</filename> are always
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followed by an update of the modification time of
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<filename>/usr/</filename>, for example by invoking
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<citerefentry project='man-pages'><refentrytitle>touch</refentrytitle><manvolnum>1</manvolnum></citerefentry>
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on it.</para>
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<para>Note that if the <varname>systemd.condition_needs_update=</varname> kernel command line option is
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used it overrides the <varname>ConditionNeedsUpdate=</varname> unit condition checks. In that case
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<filename>systemd-update-done.service</filename> will not reset the condition state until a follow-up
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reboot where the kernel switch is not specified anymore.</para>
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</refsect1>
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<refsect1>
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<title>See Also</title>
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<para><simplelist type="inline">
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<member><citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry></member>
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<member><citerefentry><refentrytitle>systemd.unit</refentrytitle><manvolnum>5</manvolnum></citerefentry></member>
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<member><citerefentry project='man-pages'><refentrytitle>touch</refentrytitle><manvolnum>1</manvolnum></citerefentry></member>
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</simplelist></para>
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</refsect1>
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</refentry>
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