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-<?xml version='1.0'?> <!--*- Mode: nxml; nxml-child-indent: 2; indent-tabs-mode: nil -*-->
-<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN"
-"http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
-
-<!--
- This file is part of systemd.
-
- Copyright 2013 Harald Hoyer
-
- systemd is free software; you can redistribute it and/or modify it
- under the terms of the GNU Lesser General Public License as published by
- the Free Software Foundation; either version 2.1 of the License, or
- (at your option) any later version.
-
- systemd is distributed in the hope that it will be useful, but
- WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- Lesser General Public License for more details.
-
- You should have received a copy of the GNU Lesser General Public License
- along with systemd; If not, see <http://www.gnu.org/licenses/>.
--->
-
-<refentry id="kernel-install">
-
- <refentryinfo>
- <title>kernel-install</title>
- <productname>systemd</productname>
-
- <authorgroup>
- <author>
- <contrib>Developer</contrib>
- <firstname>Harald</firstname>
- <surname>Hoyer</surname>
- <email>harald@redhat.com</email>
- </author>
- </authorgroup>
- </refentryinfo>
-
- <refmeta>
- <refentrytitle>kernel-install</refentrytitle>
- <manvolnum>8</manvolnum>
- </refmeta>
-
- <refnamediv>
- <refname>kernel-install</refname>
- <refpurpose>Add and remove kernel and initramfs images to and from /boot</refpurpose>
- </refnamediv>
-
- <refsynopsisdiv>
- <cmdsynopsis>
- <command>kernel-install</command>
- <arg choice="plain">COMMAND</arg>
- <arg choice="plain"><replaceable>KERNEL-VERSION</replaceable></arg>
- <arg choice="opt"><replaceable>KERNEL-IMAGE</replaceable></arg>
- </cmdsynopsis>
- </refsynopsisdiv>
-
- <refsect1>
- <title>Description</title>
- <para>
- <command>kernel-install</command> is used to install and remove kernel and
- initramfs images to and from <filename>/boot</filename>.
- </para>
-
- <para><command>kernel-install</command> will execute the files
- located in the directory <filename>/usr/lib/kernel/install.d/</filename>
- and the local administration directory <filename>/etc/kernel/install.d/</filename>.
- All files are collectively sorted and executed in lexical order, regardless of the directory in
- which they live. However, files with identical filenames replace each other.
- Files in <filename>/etc/kernel/install.d/</filename> take precedence over files with the same name
- in <filename>/usr/lib/kernel/install.d/</filename>. This can be used to override a system-supplied
- executables with a local file if needed; a symbolic link in <filename>/etc/kernel/install.d/</filename>
- with the same name as an executable in <filename>/usr/lib/kernel/install.d/</filename>,
- pointing to <filename>/dev/null</filename>, disables the executable entirely. Executables must have the
- extension <literal>.install</literal>; other extensions are ignored.</para>
-
- <para>An executable should return <constant>0</constant> on success. It may also
- return <constant>77</constant> to cause the whole operation to terminate
- (executables later in lexical order will be skipped).</para>
- </refsect1>
-
- <refsect1>
- <title>Commands</title>
- <para>The following commands are understood:</para>
- <variablelist>
- <varlistentry>
- <term><command>add <replaceable>KERNEL-VERSION</replaceable> <replaceable>KERNEL-IMAGE</replaceable></command></term>
- <listitem>
- <para><command>kernel-install</command> creates the directory
- <filename>/boot/<replaceable>MACHINE-ID</replaceable>/<replaceable>KERNEL-VERSION</replaceable>/</filename>
- and calls every executable
- <filename>/usr/lib/kernel/install.d/*.install</filename> and
- <filename>/etc/kernel/install.d/*.install</filename> with
- the arguments
- <programlisting>add <replaceable>KERNEL-VERSION</replaceable> <filename>/boot/<replaceable>MACHINE-ID</replaceable>/<replaceable>KERNEL-VERSION</replaceable>/</filename></programlisting>
- </para>
-
- <para>The kernel-install plugin <filename>50-depmod.install</filename> runs depmod for the <replaceable>KERNEL-VERSION</replaceable>.</para>
-
- <para>The kernel-install plugin
- <filename>90-loaderentry.install</filename> copies
- <replaceable>KERNEL-IMAGE</replaceable> to
- <filename>/boot/<replaceable>MACHINE-ID</replaceable>/<replaceable>KERNEL-VERSION</replaceable>/linux</filename>.
- It also creates a boot loader entry according to the boot
- loader specification in
- <filename>/boot/loader/entries/<replaceable>MACHINE-ID</replaceable>-<replaceable>KERNEL-VERSION</replaceable>.conf</filename>.
- The title of the entry is the
- <replaceable>PRETTY_NAME</replaceable> parameter specified
- in <filename>/etc/os-release</filename> or
- <filename>/usr/lib/os-release</filename> (if the former is
- missing), or "GNU/Linux
- <replaceable>KERNEL-VERSION</replaceable>", if unset. If
- the file <filename>initrd</filename> is found next to the
- <filename>linux</filename> file, the initrd will be added to
- the configuration.</para>
- </listitem>
- </varlistentry>
- <varlistentry>
- <term><command>remove <replaceable>KERNEL-VERSION</replaceable></command></term>
- <listitem>
- <para>Calls every executable <filename>/usr/lib/kernel/install.d/*.install</filename>
- and <filename>/etc/kernel/install.d/*.install</filename> with the arguments
- <programlisting>remove <replaceable>KERNEL-VERSION</replaceable> <filename>/boot/<replaceable>MACHINE-ID</replaceable>/<replaceable>KERNEL-VERSION</replaceable>/</filename></programlisting>
- </para>
-
- <para><command>kernel-install</command> removes the entire directory
- <filename>/boot/<replaceable>MACHINE-ID</replaceable>/<replaceable>KERNEL-VERSION</replaceable>/</filename> afterwards.</para>
-
- <para>The kernel-install plugin <filename>90-loaderentry.install</filename> removes the file
- <filename>/boot/loader/entries/<replaceable>MACHINE-ID</replaceable>-<replaceable>KERNEL-VERSION</replaceable>.conf</filename>.</para>
- </listitem>
- </varlistentry>
-
- </variablelist>
-
- </refsect1>
-
- <refsect1>
- <title>Exit status</title>
- <para>If every executable returns with 0, 0 is returned, a non-zero failure code otherwise.</para>
- </refsect1>
-
- <refsect1>
- <title>Files</title>
- <variablelist>
- <varlistentry>
- <term>
- <filename>/usr/lib/kernel/install.d/*.install</filename>
- <filename>/etc/kernel/install.d/*.install</filename>
- </term>
- <listitem>
- <para>Drop-in files which are executed by kernel-install.</para>
- </listitem>
- </varlistentry>
- <varlistentry>
- <term>
- <filename>/etc/kernel/cmdline</filename>
- <filename>/proc/cmdline</filename>
- </term>
- <listitem>
- <para>The content of the file <filename>/etc/kernel/cmdline</filename> specifies the kernel command line to use.
- If that file does not exist, <filename>/proc/cmdline</filename> is used.</para>
- </listitem>
- </varlistentry>
- <varlistentry>
- <term>
- <filename>/etc/machine-id</filename>
- </term>
- <listitem>
- <para>The content of the file specifies the machine identification <replaceable>MACHINE-ID</replaceable>.</para>
- </listitem>
- </varlistentry>
- <varlistentry>
- <term>
- <filename>/etc/os-release</filename>
- <filename>/usr/lib/os-release</filename>
- </term>
- <listitem>
- <para>The content of the file specifies the operating system title <replaceable>PRETTY_NAME</replaceable>.</para>
- </listitem>
- </varlistentry>
- </variablelist>
- </refsect1>
-
- <refsect1>
- <title>See Also</title>
- <para>
- <citerefentry><refentrytitle>machine-id</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
- <citerefentry><refentrytitle>os-release</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
- <ulink url="http://www.freedesktop.org/wiki/Specifications/BootLoaderSpec">Boot loader specification</ulink>
- </para>
- </refsect1>
-
-</refentry>