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<?xml version="1.0"?>
<!--*-nxml-*-->
<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
"http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd">
<!-- SPDX-License-Identifier: LGPL-2.1-or-later -->
<refentry id="systemd-update-done.service">
<refentryinfo>
<title>systemd-update-done.service</title>
<productname>systemd</productname>
</refentryinfo>
<refmeta>
<refentrytitle>systemd-update-done.service</refentrytitle>
<manvolnum>8</manvolnum>
</refmeta>
<refnamediv>
<refname>systemd-update-done.service</refname>
<refname>systemd-update-done</refname>
<refpurpose>Mark <filename>/etc/</filename> and <filename>/var/</filename> fully updated</refpurpose>
</refnamediv>
<refsynopsisdiv>
<para><filename>systemd-update-done.service</filename></para>
<para><filename>/usr/lib/systemd/systemd-update-done</filename></para>
</refsynopsisdiv>
<refsect1>
<title>Description</title>
<para><filename>systemd-update-done.service</filename> is a
service that is invoked as part of the first boot after the vendor
operating system resources in <filename>/usr/</filename> have been
updated. This is useful to implement offline updates of
<filename>/usr/</filename> which might require updates to
<filename>/etc/</filename> or <filename>/var/</filename> on the
following boot.</para>
<para><filename>systemd-update-done.service</filename> updates the
file modification time (mtime) of the stamp files
<filename>/etc/.updated</filename> and
<filename>/var/.updated</filename> to the modification time of the
<filename>/usr/</filename> directory, unless the stamp files are
already newer.</para>
<para>Services that shall run after offline upgrades of
<filename>/usr/</filename> should order themselves before
<filename>systemd-update-done.service</filename>, and use the
<varname>ConditionNeedsUpdate=</varname> (see
<citerefentry><refentrytitle>systemd.unit</refentrytitle><manvolnum>5</manvolnum></citerefentry>)
condition to make sure to run when <filename>/etc/</filename> or
<filename>/var/</filename> are older than <filename>/usr/</filename>
according to the modification times of the files described above.
This requires that updates to <filename>/usr/</filename> are always
followed by an update of the modification time of
<filename>/usr/</filename>, for example by invoking
<citerefentry project='man-pages'><refentrytitle>touch</refentrytitle><manvolnum>1</manvolnum></citerefentry>
on it.</para>
<para>Note that if the <varname>systemd.condition_needs_update=</varname> kernel command line option is
used it overrides the <varname>ConditionNeedsUpdate=</varname> unit condition checks. In that case
<filename>systemd-update-done.service</filename> will not reset the condition state until a follow-up
reboot where the kernel switch is not specified anymore.</para>
</refsect1>
<refsect1>
<title>See Also</title>
<para><simplelist type="inline">
<member><citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry></member>
<member><citerefentry><refentrytitle>systemd.unit</refentrytitle><manvolnum>5</manvolnum></citerefentry></member>
<member><citerefentry project='man-pages'><refentrytitle>touch</refentrytitle><manvolnum>1</manvolnum></citerefentry></member>
</simplelist></para>
</refsect1>
</refentry>
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