man/kernel-install.xml

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   8   Copyright 2013 Harald Hoyer
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  23
  24 <refentry id="kernel-install">
  25
  26   <refentryinfo>
  27     <title>kernel-install</title>
  28     <productname>systemd</productname>
  29
  30     <authorgroup>
  31       <author>
  32         <contrib>Developer</contrib>
  33         <firstname>Harald</firstname>
  34         <surname>Hoyer</surname>
  35         <email>harald@redhat.com</email>
  36       </author>
  37     </authorgroup>
  38   </refentryinfo>
  39
  40   <refmeta>
  41     <refentrytitle>kernel-install</refentrytitle>
  42     <manvolnum>8</manvolnum>
  43   </refmeta>
  44
  45   <refnamediv>
  46     <refname>kernel-install</refname>
  47     <refpurpose>Add and remove kernel and initramfs images to and from /boot</refpurpose>
  48   </refnamediv>
  49
  50   <refsynopsisdiv>
  51     <cmdsynopsis>
  52       <command>kernel-install</command>
  53       <arg choice="plain">COMMAND</arg>
  54       <arg choice="plain"><replaceable>KERNEL-VERSION</replaceable></arg>
  55       <arg choice="opt"><replaceable>KERNEL-IMAGE</replaceable></arg>
  56     </cmdsynopsis>
  57   </refsynopsisdiv>
  58
  59   <refsect1>
  60     <title>Description</title>
  61     <para>
  62       <command>kernel-install</command> is used to install and remove kernel and
  63       initramfs images to and from <filename>/boot</filename>.
  64     </para>
  65
  66     <para><command>kernel-install</command> will execute the files
  67     located in the directory <filename>/usr/lib/kernel/install.d/</filename>
  68     and the local administration directory <filename>/etc/kernel/install.d/</filename>.
  69     All files are collectively sorted and executed in lexical order, regardless of the directory in
  70     which they live. However, files with identical filenames replace each other.
  71     Files in <filename>/etc/kernel/install.d/</filename> take precedence over files with the same name
  72     in <filename>/usr/lib/kernel/install.d/</filename>. This can be used to override a system-supplied
  73     executables with a local file if needed; a symbolic link in <filename>/etc/kernel/install.d/</filename>
  74     with the same name as an executable in <filename>/usr/lib/kernel/install.d/</filename>,
  75     pointing to <filename>/dev/null</filename>, disables the executable entirely. Executables must have the
  76     extension <literal>.install</literal>; other extensions are ignored.</para>
  77
  78     <para>An executable should return <constant>0</constant> on success. It may also
  79     return <constant>77</constant> to cause the whole operation to terminate
  80     (executables later in lexical order will be skipped).</para>
  81   </refsect1>
  82
  83   <refsect1>
  84     <title>Commands</title>
  85     <para>The following commands are understood:</para>
  86     <variablelist>
  87       <varlistentry>
  88         <term><command>add <replaceable>KERNEL-VERSION</replaceable> <replaceable>KERNEL-IMAGE</replaceable></command></term>
  89         <listitem>
  90           <para><command>kernel-install</command> creates the directory
  91           <filename>/boot/<replaceable>MACHINE-ID</replaceable>/<replaceable>KERNEL-VERSION</replaceable>/</filename>
  92           and calls every executable
  93           <filename>/usr/lib/kernel/install.d/*.install</filename> and
  94           <filename>/etc/kernel/install.d/*.install</filename> with
  95           the arguments
  96           <programlisting>add <replaceable>KERNEL-VERSION</replaceable> <filename>/boot/<replaceable>MACHINE-ID</replaceable>/<replaceable>KERNEL-VERSION</replaceable>/</filename></programlisting>
  97           </para>
  98
  99           <para>The kernel-install plugin <filename>50-depmod.install</filename> runs depmod for the <replaceable>KERNEL-VERSION</replaceable>.</para>
 100
 101           <para>The kernel-install plugin
 102           <filename>90-loaderentry.install</filename> copies
 103           <replaceable>KERNEL-IMAGE</replaceable> to
 104           <filename>/boot/<replaceable>MACHINE-ID</replaceable>/<replaceable>KERNEL-VERSION</replaceable>/linux</filename>.
 105           It also creates a boot loader entry according to the boot
 106           loader specification in
 107           <filename>/boot/loader/entries/<replaceable>MACHINE-ID</replaceable>-<replaceable>KERNEL-VERSION</replaceable>.conf</filename>.
 108           The title of the entry is the
 109           <replaceable>PRETTY_NAME</replaceable> parameter specified
 110           in <filename>/etc/os-release</filename> or
 111           <filename>/usr/lib/os-release</filename> (if the former is
 112           missing), or "Linux
 113           <replaceable>KERNEL-VERSION</replaceable>", if unset.  If
 114           the file <filename>initrd</filename> is found next to the
 115           <filename>linux</filename> file, the initrd will be added to
 116           the configuration.</para>
 117         </listitem>
 118       </varlistentry>
 119       <varlistentry>
 120         <term><command>remove <replaceable>KERNEL-VERSION</replaceable></command></term>
 121         <listitem>
 122           <para>Calls every executable <filename>/usr/lib/kernel/install.d/*.install</filename>
 123           and <filename>/etc/kernel/install.d/*.install</filename> with the arguments
 124           <programlisting>remove <replaceable>KERNEL-VERSION</replaceable> <filename>/boot/<replaceable>MACHINE-ID</replaceable>/<replaceable>KERNEL-VERSION</replaceable>/</filename></programlisting>
 125           </para>
 126
 127           <para><command>kernel-install</command> removes the entire directory
 128           <filename>/boot/<replaceable>MACHINE-ID</replaceable>/<replaceable>KERNEL-VERSION</replaceable>/</filename> afterwards.</para>
 129
 130           <para>The kernel-install plugin <filename>90-loaderentry.install</filename> removes the file
 131           <filename>/boot/loader/entries/<replaceable>MACHINE-ID</replaceable>-<replaceable>KERNEL-VERSION</replaceable>.conf</filename>.</para>
 132         </listitem>
 133       </varlistentry>
 134
 135     </variablelist>
 136
 137   </refsect1>
 138
 139   <refsect1>
 140     <title>Exit status</title>
 141     <para>If every executable returns with 0, 0 is returned, a non-zero failure code otherwise.</para>
 142   </refsect1>
 143
 144   <refsect1>
 145     <title>Files</title>
 146     <variablelist>
 147       <varlistentry>
 148         <term>
 149           <filename>/usr/lib/kernel/install.d/*.install</filename>
 150           <filename>/etc/kernel/install.d/*.install</filename>
 151         </term>
 152           <listitem>
 153             <para>Drop-in files which are executed by kernel-install.</para>
 154           </listitem>
 155       </varlistentry>
 156       <varlistentry>
 157         <term>
 158           <filename>/etc/kernel/cmdline</filename>
 159           <filename>/proc/cmdline</filename>
 160         </term>
 161           <listitem>
 162             <para>The content of the file <filename>/etc/kernel/cmdline</filename> specifies the kernel command line to use.
 163             If that file does not exist, <filename>/proc/cmdline</filename> is used.</para>
 164           </listitem>
 165       </varlistentry>
 166       <varlistentry>
 167         <term>
 168           <filename>/etc/machine-id</filename>
 169         </term>
 170           <listitem>
 171             <para>The content of the file specifies the machine identification <replaceable>MACHINE-ID</replaceable>.</para>
 172           </listitem>
 173       </varlistentry>
 174       <varlistentry>
 175         <term>
 176           <filename>/etc/os-release</filename>
 177           <filename>/usr/lib/os-release</filename>
 178         </term>
 179           <listitem>
 180             <para>The content of the file specifies the operating system title <replaceable>PRETTY_NAME</replaceable>.</para>
 181           </listitem>
 182       </varlistentry>
 183     </variablelist>
 184   </refsect1>
 185
 186   <refsect1>
 187     <title>See Also</title>
 188     <para>
 189       <citerefentry><refentrytitle>machine-id</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
 190       <citerefentry><refentrytitle>os-release</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
 191       <ulink url="http://www.freedesktop.org/wiki/Specifications/BootLoaderSpec">Boot loader specification</ulink>
 192     </para>
 193   </refsect1>
 194
 195 </refentry>