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 file names 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 /dev/null, disables the executable entirely. Executables must have the
  76     extension .install; other extensions are ignored.</para>
  77
  78   </refsect1>
  79
  80   <refsect1>
  81     <title>Commands</title>
  82     <para>The following commands are understood:</para>
  83     <variablelist>
  84       <varlistentry>
  85         <term><command>add <replaceable>KERNEL-VERSION</replaceable> <replaceable>KERNEL-IMAGE</replaceable></command></term>
  86         <listitem>
  87           <para>calls every executable
  88           <filename>/usr/lib/kernel/install.d/*.install</filename> and
  89           <filename>/etc/kernel/install.d/*.install</filename> with
  90           the arguments
  91           <programlisting>
  92 add <replaceable>KERNEL-VERSION</replaceable> <filename>/boot/<replaceable>MACHINE-ID</replaceable>/<replaceable>KERNEL-VERSION</replaceable>/</filename>
  93           </programlisting>
  94           </para>
  95
  96           <para><command>kernel-install</command> copies
  97           <replaceable>KERNEL-IMAGE</replaceable> to
  98           <filename>/boot/<replaceable>MACHINE-ID</replaceable>/<replaceable>KERNEL-VERSION</replaceable>/linux</filename>.
  99           </para>
 100
 101           <para><command>kernel-install</command> also creates a boot
 102           loader entry according to the boot loader specification in
 103           <filename>/boot/loader/entries/<replaceable>MACHINE-ID</replaceable>-<replaceable>KERNEL-VERSION</replaceable>.conf</filename>.
 104           If the file <filename>initrd</filename> is found next to the
 105           <filename>linux</filename> file, the initrd will be added to
 106           the configuration.</para>
 107         </listitem>
 108       </varlistentry>
 109       <varlistentry>
 110         <term><command>remove</command> <replaceable>KERNEL-VERSION</replaceable> <replaceable>KERNEL-IMAGE</replaceable></term>
 111         <listitem>
 112           <para>calls every executable <filename>/usr/lib/kernel/install.d/*.install</filename>
 113           and <filename>/etc/kernel/install.d/*.install</filename> with the arguments
 114           <programlisting>
 115 remove <replaceable>KERNEL-VERSION</replaceable> <filename>/boot/<replaceable>MACHINE-ID</replaceable>/<replaceable>KERNEL-VERSION</replaceable>/</filename>
 116           </programlisting>
 117           </para>
 118
 119           <para><command>kernel-install</command> removes the entire directory
 120           <filename>/boot/<replaceable>MACHINE-ID</replaceable>/<replaceable>KERNEL-VERSION</replaceable>/</filename>
 121           and the file
 122           <filename>/boot/loader/entries/<replaceable>MACHINE-ID</replaceable>-<replaceable>KERNEL-VERSION</replaceable>.conf</filename></para>
 123         </listitem>
 124       </varlistentry>
 125
 126     </variablelist>
 127
 128   </refsect1>
 129
 130   <refsect1>
 131     <title>Exit status</title>
 132     <para>If every executable returns with 0, 0 is returned, a non-zero failure code otherwise.</para>
 133   </refsect1>
 134
 135   <refsect1>
 136     <title>Files</title>
 137     <variablelist>
 138       <varlistentry>
 139         <term>
 140           <filename>/usr/lib/kernel/install.d/*.install</filename>
 141           <filename>/etc/kernel/install.d/*.install</filename>
 142         </term>
 143           <listitem>
 144             <para>Drop-in files, which are executed by kernel-install.</para>
 145           </listitem>
 146       </varlistentry>
 147       <varlistentry>
 148         <term>
 149           <filename>/etc/kernel/cmdline</filename>
 150           <filename>/proc/cmdline</filename>
 151         </term>
 152           <listitem>
 153             <para>The content of the file <filename>/etc/kernel/cmdline</filename> specifies the kernel command line to use.
 154             If that file does not exist, <filename>/proc/cmdline</filename> is used.</para>
 155           </listitem>
 156       </varlistentry>
 157       <varlistentry>
 158         <term>
 159           <filename>/etc/machine-id</filename>
 160         </term>
 161           <listitem>
 162             <para>The content of the file specifies the machine identification <replaceable>MACHINE-ID</replaceable>.</para>
 163           </listitem>
 164       </varlistentry>
 165       <varlistentry>
 166         <term>
 167           <filename>/etc/os-release</filename>
 168         </term>
 169           <listitem>
 170             <para>The content of the file specifies the operating system id <replaceable>OS-ID</replaceable>.</para>
 171           </listitem>
 172       </varlistentry>
 173     </variablelist>
 174   </refsect1>
 175
 176   <refsect1>
 177     <title>See Also</title>
 178     <para>
 179       <citerefentry><refentrytitle>machine-id</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
 180       <citerefentry><refentrytitle>os-release</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
 181       <ulink url="http://www.freedesktop.org/wiki/Specifications/BootLoaderSpec">Boot loader specification</ulink>
 182     </para>
 183   </refsect1>
 184
 185 </refentry>