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+<?xml version='1.0'?> <!--*-nxml-*-->
+<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN"
+ "http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
+
+<!--
+ SPDX-License-Identifier: LGPL-2.1+
+-->
+
+<refentry id="systemd-bless-boot.service" conditional='ENABLE_EFI'
+ xmlns:xi="http://www.w3.org/2001/XInclude">
+
+ <refentryinfo>
+ <title>systemd-bless-boot.service</title>
+ <productname>systemd</productname>
+ </refentryinfo>
+
+ <refmeta>
+ <refentrytitle>systemd-bless-boot.service</refentrytitle>
+ <manvolnum>8</manvolnum>
+ </refmeta>
+
+ <refnamediv>
+ <refname>systemd-bless-boot.service</refname>
+ <refpurpose>Mark current boot process as successful</refpurpose>
+ </refnamediv>
+
+ <refsynopsisdiv>
+ <para><filename>systemd-bless-boot.service</filename></para>
+ <para><filename>/usr/lib/systemd/system-bless-boot</filename></para>
+ </refsynopsisdiv>
+
+ <refsect1>
+ <title>Description</title>
+
+ <para><filename>systemd-bless-boot.service</filename> is a system service that marks the current boot process as
+ successful. It's automatically pulled into the initial transaction when
+ <citerefentry><refentrytitle>systemd-bless-boot-generator</refentrytitle><manvolnum>8</manvolnum></citerefentry>
+ detects that <citerefentry><refentrytitle>systemd-boot</refentrytitle><manvolnum>7</manvolnum></citerefentry> style
+ boot counting is used.</para>
+
+ <para>Internally, the service operates based on the <varname>LoaderBootCountPath</varname> EFI variable (of the
+ vendor UUID <constant>4a67b082-0a4c-41cf-b6c7-440b29bb8c4</constant>), which is passed from the boot loader to the
+ OS. It contains a file system path (relative to the EFI system partition) of the <ulink
+ url="https://systemd.io/BOOT_LOADER_SPECIFICATION">Boot Loader Specification</ulink> compliant boot loader entry
+ file or unified kernel image file that was used to boot up the
+ system. <command>systemd-bless-boot.service</command> removes the two 'tries done' and 'tries left' numeric boot
+ counters from the filename, which indicates to future invocations of the boot loader that the entry has completed
+ booting successfully at least once. (This service will hence rename the boot loader entry file or unified kernel
+ image file on the first successful boot.)</para>
+ </refsect1>
+
+ <refsect1>
+ <title>Options</title>
+
+ <para>The <filename>/usr/lib/systemd/system-bless-boot</filename> executable may also be invoked from the
+ command line, taking one of the following command arguments:</para>
+
+ <variablelist>
+ <varlistentry>
+ <term><option>status</option></term>
+
+ <listitem><para>The current status of the boot loader entry file or unified kernel image file is shown. This
+ outputs one of <literal>good</literal>, <literal>bad</literal>, <literal>indeterminate</literal>,
+ <literal>clean</literal>, depending on the state and previous invocations of the command. The string
+ <literal>indeterminate</literal> is shown initially after boot, before it has been marked as "good" or
+ "bad". The string <literal>good</literal> is shown after the boot was marked as "good" with the
+ <option>good</option> command below, and "bad" conversely after the <option>bad</option> command was
+ invoked. The string <literal>clean</literal> is returned when boot counting is currently not in effect.</para>
+
+ <para>This command is implied if no command argument is specified.</para></listitem>
+ </varlistentry>
+
+ <varlistentry>
+ <term><option>good</option></term>
+
+ <listitem><para>When invoked, the current boot loader entry file or unified kernel image file will be marked as
+ "good", executing the file rename operation described above. This command is intended to be invoked at the end
+ of a successful boot. The <filename>systemd-bless-boot.service</filename> unit invokes this
+ command.</para></listitem>
+ </varlistentry>
+
+ <varlistentry>
+ <term><option>bad</option></term>
+
+ <listitem><para>When called the 'tries left' counter in the boot loader entry file name or unified kernel image
+ file name is set to zero, marking the boot loader entry or kernel image as "bad", so that the boot loader won't
+ consider it anymore on future boots (at least as long as there are other entries available that are not marked
+ "bad" yet). This command is normally not executed, but can be used to instantly put an end to the boot counting
+ logic if a problem is detected and persistently mark the boot entry as bad.</para></listitem>
+ </varlistentry>
+
+ <varlistentry>
+ <term><option>indeterminate</option></term>
+
+ <listitem><para>This command undoes any marking of the current boot loader entry file or unified kernel image
+ file as good or bad. This is implemented by renaming the boot loader entry file or unified kernel image file
+ back to the path encoded in the <varname>LoaderBootCountPath</varname> EFI variable.</para></listitem>
+ </varlistentry>
+
+ <xi:include href="standard-options.xml" xpointer="help" />
+ <xi:include href="standard-options.xml" xpointer="version" />
+
+ </variablelist>
+ </refsect1>
+
+ <refsect1>
+ <title>See Also</title>
+ <para>
+ <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
+ <citerefentry><refentrytitle>systemd-boot</refentrytitle><manvolnum>7</manvolnum></citerefentry>,
+ <citerefentry><refentrytitle>systemd.special</refentrytitle><manvolnum>1</manvolnum></citerefentry>
+ </para>
+ </refsect1>
+
+</refentry>