kernel-install: add kernel-install tool

2013-02-22 17:18:47 +01:00 · 2013-02-22 17:18:47 +01:00 · 81516adcb7
parent 1ddf879acf
commit 81516adcb7
4 changed files with 294 additions and 0 deletions
--- a/Makefile-man.am
+++ b/Makefile-man.am
@ -9,6 +9,7 @@ MANPAGES += \
 	man/journalctl.1 \
 	man/journald.conf.5 \
 	man/kernel-command-line.7 \
+	man/kernel-install.8 \
 	man/locale.conf.5 \
 	man/localtime.5 \
 	man/machine-id.5 \
--- a/Makefile.am
+++ b/Makefile.am
@ -278,6 +278,9 @@ bin_PROGRAMS = \
 	systemd-delta \
 	systemd-analyze

+bin_SCRIPTS = \
+	src/kernel-install/kernel-install
+
 rootlibexec_PROGRAMS = \
 	systemd \
 	systemd-cgroups-agent \
--- a/man/kernel-install.xml
+++ b/man/kernel-install.xml
@ -0,0 +1,138 @@
+<?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">
+
+<!--
+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="req">COMMAND</arg> <arg choice="req">KERNEL VERSION</arg> <arg choice="req">KERNEL IMAGE</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>kernel-install 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 directories in
+    which they live. However, files with identical file names 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 /dev/null, disables the executable entirely. Executables must have the
+    extension .install; other extensions are ignored.</para>
+
+  </refsect1>
+
+  <refsect1>
+    <title>Commands</title>
+    <para>The following commands are understood:</para>
+    <variablelist>
+      <varlistentry>
+        <term>add &lt;KERNEL VERSION> &lt;KERNEL IMAGE></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
+          "add &lt;KERNEL VERSION> <filename>/boot/&lt;MACHINE-ID>/&lt;KERNEL VERSION>/</filename>"</para>
+
+          <para>kernel-install copies &lt;KERNEL IMAGE> to
+          <filename>/boot/&lt;MACHINE-ID>/&lt;KERNEL VERSION>/linux</filename>.</para>
+
+          <para>kernel-install also creates a boot loader entry according to the boot loader specification
+          in <filename>/boot/loader/entries/&lt;OS-ID>-&lt;KERNEL VERSION>-&lt;MACHINE-ID>.conf</filename>.
+          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>remove &lt;KERNEL VERSION> &lt;KERNEL IMAGE></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:
+        "remove &lt;KERNEL VERSION> <filename>/boot/&lt;MACHINE-ID>/&lt;KERNEL VERSION>/</filename>"
+        </para>
+        <para>kernel-install removes the entire directory <filename>/boot/&lt;MACHINE-ID>/&lt;KERNEL VERSION>/</filename>
+        and the file <filename>/boot/loader/entries/&lt;OS-ID>-&lt;KERNEL VERSION>-&lt;MACHINE-ID>.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>
+    </variablelist>
+  </refsect1>
+
+  <refsect1>
+    <title>See Also</title>
+    <para>
+      <ulink url="http://www.freedesktop.org/wiki/Specifications/BootLoaderSpec">Boot loader specification</ulink>
+    </para>
+  </refsect1>
+
+</refentry>
--- a/src/kernel-install/kernel-install
+++ b/src/kernel-install/kernel-install
@ -0,0 +1,152 @@
+#!/bin/bash
+# -*- mode: shell-script; indent-tabs-mode: nil; sh-basic-offset: 4; -*-
+# ex: ts=8 sw=4 sts=4 et filetype=sh
+#
+# 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
+# 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/>.
+
+export LC_COLLATE=C
+
+COMMAND="$1"
+KERNEL_VERSION="$2"
+KERNEL_IMAGE="$3"
+
+[[ -f /etc/os-release ]] && . /etc/os-release
+if ! [[ $ID ]]; then
+    echo "Can't determine the name of your distribution. Please create /etc/os-release." >&2
+    echo "See http://www.freedesktop.org/software/systemd/man/os-release.html" >&2
+    exit 1
+fi
+
+[[ -f /etc/machine-id ]] && read MACHINE_ID < /etc/machine-id
+if ! [[ $MACHINE_ID ]]; then
+    echo "Can't determine your machine id. Please create /etc/machine-id!" >&2
+    echo "See http://www.freedesktop.org/software/systemd/man/machine-id.html" >&2
+    exit 1
+fi
+
+if [[ -f /etc/kernel/cmdline ]]; then
+    readarray -t BOOT_OPTIONS < /etc/kernel/cmdline
+fi
+
+if ! [[ "${BOOT_OPTIONS[@]}" ]]; then
+    readarray -t BOOT_OPTIONS < /proc/cmdline
+fi
+
+if ! [[ $BOOT_OPTIONS ]]; then
+    echo "Can't determine the kernel command line parameters." >&2
+    echo "Please specify the kernel command line in /etc/kernel/cmdline!" >&2
+    exit 1
+fi
+
+usage()
+{
+    {
+        echo "Usage:"
+        echo "        $0 add <kernel-version> <kernel-image>"
+        echo "        $0 remove <kernel-version> <kernel-image>"
+    } >&2
+}
+
+if ! ( [[ $COMMAND ]] && [[ $KERNEL_VERSION ]] && [[ $KERNEL_IMAGE ]] ); then
+    usage
+    exit 1
+fi
+
+BOOT_DIR="/boot/$MACHINE_ID/$KERNEL_VERSION"
+ret=0
+
+dropindirs_sort()
+{
+    suffix=$1; shift
+    readarray -t files< <(
+        for d in "$@"; do
+            for i in "${d}/"*${suffix}; do
+                [[ -e $i ]] && echo ${i##*/}
+            done
+        done | sort -Vu
+    )
+
+    for f in "${files[@]}"; do
+        for d in "$@"; do
+            if [[ -e "$d/$f" ]]; then
+                echo "$d/$f"
+                continue 2
+            fi
+        done
+    done
+}
+
+readarray -t PLUGINS < <(
+    dropindirs_sort ".install" \
+        "/etc/kernel/install.d" \
+        "/usr/lib/kernel/install.d"
+)
+
+case "$COMMAND" in
+    add)
+        mkdir -p "$BOOT_DIR" || exit 1
+
+        for f in "${PLUGINS[@]}"; do
+            [[ -x $f ]] && "$f" add "$KERNEL_VERSION" "$BOOT_DIR"
+            ((ret+=$?))
+        done
+
+        if ! cp --preserve "$KERNEL_IMAGE" "$BOOT_DIR"/linux; then
+            echo "Can't copy '$KERNEL_IMAGE to '$BOOT_DIR/linux'!" >&2
+        fi
+
+        [[ -d /boot/loader/entries ]] || mkdir -p /boot/loader/entries
+
+        {
+            echo "title      $PRETTY_NAME"
+            echo "version    $KERNEL_VERSION"
+            echo "machine-id $MACHINE_ID"
+            echo "options    $BOOT_OPTIONS"
+            echo "linux      $BOOT_DIR/linux"
+            [[ -f "${BOOT_DIR}"/initrd ]] && \
+                echo "initrd     $BOOT_DIR/initrd"
+            :
+        } > "/boot/loader/entries/${ID}-${KERNEL_VERSION}-${MACHINE_ID}.conf"
+export LANG=C
+
+        ((ret+=$?))
+
+        if ! [[ -f "/boot/loader/entries/${ID}-${KERNEL_VERSION}-${MACHINE_ID}.conf" ]]; then
+            echo "Could not create '/boot/loader/entries/${ID}-${KERNEL_VERSION}-${MACHINE_ID}.conf'!" >&2
+        fi
+
+        ;;
+
+    remove)
+        for f in "${PLUGINS[@]}"; do
+            [[ -x $f ]] && "$f" remove "$KERNEL_VERSION" "$BOOT_DIR"
+            ((ret+=$?))
+        done
+
+        rm -fr "$BOOT_DIR"
+        rm -f "/boot/loader/entries/${ID}-${KERNEL_VERSION}-${MACHINE_ID}.conf"
+        ;;
+
+    *)
+        usage
+        ret=1;;
+esac
+
+((ret+=$?))
+
+exit $ret