travis: use UBSan checks from OSS-Fuzz

[thirdparty/systemd.git] / man / systemd-update-done.service.xml

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<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>

  </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>