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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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  Copyright 2014 Lennart Poettering

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<refentry id="systemd-update-done.service">

        <refentryinfo>
                <title>systemd-update-done.service</title>
                <productname>systemd</productname>

                <authorgroup>
                        <author>
                                <contrib>Developer</contrib>
                                <firstname>Lennart</firstname>
                                <surname>Poettering</surname>
                                <email>lennart@poettering.net</email>
                        </author>
                </authorgroup>
        </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 requires 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>

        </refsect1>

        <refsect1>
                <title>See Also</title>
                <para>
                        <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
                        <citerefentry><refentrytitle>systemd.unit</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
                        <citerefentry project='man-pages'><refentrytitle>touch</refentrytitle><manvolnum>1</manvolnum></citerefentry>
                </para>
        </refsect1>

</refentry>
