Imported from /home/lorry/working-area/delta_VirtualBox/VirtualBox-4.3.10.tar.bz2.HEADVirtualBox-4.3.10master

1 files changed, 488 insertions, 0 deletions

diff --git a/src/VBox/Installer/linux/scripts/check_module_dependencies.sh b/src/VBox/Installer/linux/scripts/check_module_dependencies.sh
new file mode 100755
index 00000000..b3baf039
--- /dev/null
+++ b/src/VBox/Installer/linux/scripts/check_module_dependencies.sh
@@ -0,0 +1,488 @@
+#!/bin/sh
+#
+# Oracle VM VirtualBox
+# VirtualBox linux installation script
+
+#
+# Copyright (C) 2007-2012 Oracle Corporation
+#
+# This file is part of VirtualBox Open Source Edition (OSE), as
+# available from http://www.virtualbox.org. This file is free software;
+# you can redistribute it and/or modify it under the terms of the GNU
+# General Public License (GPL) as published by the Free Software
+# Foundation, in version 2 as it comes in the "COPYING" file of the
+# VirtualBox OSE distribution. VirtualBox OSE is distributed in the
+# hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
+#
+
+# This script tests whether a Linux system is set up to build kernel modules,
+# and if not attempts to discover and optionally perform the necessary steps to
+# set up the system correctly, based on knowledge of popular Linux
+# distributions.  It is written for use with the VirtualBox and the VirtualBox
+# Guest Additions kernel modules but should be useful for any package which
+# needs to build kernel modules on an unknown target system.  While patches to
+# extend the range of distributions supported are welcome, please bear in mind
+# that we try to keep distribution-specific parts as small as possible, and to
+# cover as many distributions as possible in single "families".  Any
+# distribution which requires specific code to support should be sufficiently
+# widely used to justify the addition.
+
+PATH=$PATH:/bin:/sbin:/usr/sbin
+
+## @todo include routines.sh once it has been cleaned up
+
+## Set all commands used in the script to their normal values.  These are the
+# script's interface to the outside world and should be overridden for self
+# testing.
+set_up_helpers()
+{
+    exit=exit
+    get_kernel_version="uname -r"
+    file_exists="test -f"
+    string_in_file="grep -q -s"
+    do_type=type
+    find_rpm_for_file="rpm -q --whatprovides"
+    find_deb_for_file="dpkg -S"
+}
+
+
+## uname -r stand-in for self testing
+test_get_kernel_version()
+{
+    echo "$test_uname_r";
+}
+
+
+## test -f $1 or grep $1 $2 stand-in for self testing
+test_file_exists()
+{
+    test '(' -z "$2" -a "$test_test_f" = "$1" ')' -o \
+         '(' "$test_grep_string" = "$1" -a "$test_grep_file" = "$2" ')';
+}
+
+
+## rpm -q --whatprovides stand-in for self testing
+test_find_rpm_for_file()
+{
+    echo "$test_rpm_q";
+}
+
+
+## exit stand-in for self testing
+test_exit()
+{
+    test_exit_return="$1";
+}
+
+
+## dpkg -S stand-in for self testing
+test_find_deb_for_file()
+{
+    echo "$test_dpkg_s";
+}
+
+
+## type stand-in for self testing
+test_type()
+{
+    test "$1" = "$test_type_binary" && echo "$test_type_binary";
+}
+
+
+## Evaluate a line describing the results of a self test.  Outputs a line of
+#  text describing each failure.
+eval_test_line()
+{
+    ## @param test_line      The test description line to evaluate in the
+    #                        format:
+    # "<line num>: <variable to set>=<value> ...=><variable to check>=<expected value>..."
+    #                        All output variables will be nulled first.  Unused
+    #                        "variables to set" should be explicitly set to
+    #                        null in the list.  Spaces in variable names are
+    #                        not allowed, in values they can be escaped with
+    #                        backslash, and "=>" can be embedded as "=\>".
+    test_line="$1"
+    ## @param test_function  The function to call after setting the variables
+    #                        from the test line
+    test_function="$2"
+
+    line_num=${test_line%%:*=>*}
+    env_all=${test_line#*:}
+    env_in=${env_all%%=>*}
+    env_out=${env_all#*=>}
+    # Blank out output variables first.
+    eval set $env_out  # Trick for dealing with escaped embedded spaces.
+    for j in "$@"; do
+        var_name="${j%%=*}"
+        eval $var_name=
+    done
+    # Set input variables.
+    eval set $env_in
+    for j in "$@"; do
+        var_name=${j%%=*}
+        var_value="${j#*=}"
+        eval $var_name=\"$var_value\"  # More tricks
+    done
+    eval $test_function
+    eval set $env_out
+    for j in "$@"; do
+        var_name=${j%%=*}
+        var_value="$(eval echo \$$var_name)"
+        var_expected="${j#*=}"
+        case $var_value in
+        $var_expected) ;;
+        *)
+            echo "$test_function: failure: $var_name=$var_value in line $line_num"
+            ;;
+        esac
+    done
+}
+
+
+## List of tests to be executed in a test run
+self_tests=
+
+
+## Aborts the script and prints a printf-type error message to stderr.
+abort()
+{
+    ## Message to print to stderr before aborting.
+    message="$1"
+
+    echo 1>&2 "$message"
+    echo 1>&2 "Unable to continue."
+    $exit 1
+}
+
+
+## Abort if we are not running as root
+check_root() {
+    case $(id -u) in 0) ;; *)
+        abort "This program must be run with administrator privileges."
+    esac
+}
+
+
+## Get information about the kernel running on the system (version and path
+# information).
+# @param KERN_VER       [out]  Full kernel version (e.g. 3.0.0-15-generic).
+# @param KERN_VER_BASE  [out]  Base kernel version (e.g. 3.0.0).
+# @param KERN_VER_SHORT [out]  Kernel major and minor version (e.g. 3.0).
+# @param KERN_VER_EXTRA [out]  Kernel version "extra" information (e.g.
+#                              -15-generic).
+# @param KERN_DIR       [out]  The directory where kernel modules and headers
+#                              live (e.g. /lib/modules/3.0.0-15-generic)
+get_kernel_information()
+{
+    KERN_VER=$($get_kernel_version 2>/dev/null || abort "'uname' tool not found.")
+    kern_ver_rest=${KERN_VER#*.*.}
+    kern_ver_micro=${kern_ver_rest%%[!0-9]*}
+    KERN_VER_EXTRA=${kern_ver_rest#$kern_ver_micro}
+    KERN_VER_BASE=${KERN_VER%$KERN_VER_EXTRA}
+    KERN_VER_SHORT=${KERN_VER_BASE%.*}
+    KERN_DIR="/lib/modules/$KERN_VER"
+}
+
+
+## Self test for the "get_kernel_information" function.  Outputs a line of
+#  text describing each failure.
+test_get_kernel_information()
+{
+    get_kernel_version=test_get_kernel_version
+    for i in \
+        "1: test_uname_r=3.0.0-15-generic=>KERN_VER=3.0.0-15-generic KERN_VER_BASE=3.0.0 KERN_VER_SHORT=3.0 KERN_VER_EXTRA=-15-generic KERN_DIR=/lib/modules/3.0.0-15-generic" \
+        "2: test_uname_r=2.4.21-50.EL=>KERN_VER=2.4.21-50.EL KERN_VER_BASE=2.4.21 KERN_VER_SHORT=2.4 KERN_VER_EXTRA=-50.EL KERN_DIR=/lib/modules/2.4.21-50.EL"
+    do eval_test_line "$i" get_kernel_information; done
+}
+
+self_tests="$self_tests test_get_kernel_information"
+
+
+## Test whether a three-digit kernel version number is less than a second one.
+kernel_version_lt()
+{
+    major1=${1%.*.*}
+    major2=${2%.*.*}
+    short1=${1%.*}
+    short2=${2%.*}
+    minor1=${short1#*.}
+    minor2=${short2#*.}
+    micro1=${1#*.*.}
+    micro2=${2#*.*.}
+    test $major1 -lt $major2 -o \
+      '(' $major1 -eq $major2 -a $minor1 -lt $minor2 ')' -o \
+      '(' $major1 -eq $major2 -a $minor1 -eq $minor2 -a $micro1 -lt $micro2 ')'
+}
+
+
+## Self test for the "kernel_version_lt" function.  Outputs a line of
+#  text describing each failure.
+test_kernel_version_lt()
+{
+    for i in \
+        "1: ver1=2.4.6 ver2=3.4.6 =>lt=true" \
+        "2: ver1=3.4.6 ver2=3.4.6 =>lt=" \
+        "3: ver1=2.4.6 ver2=2.4.7 =>lt=true" \
+        "4: ver1=2.4.60 ver2=2.4.7 =>lt=" \
+        "5: ver1=2.31.7 ver2=2.4.7 =>lt="
+    do eval_test_line "$i" "kernel_version_lt \$ver1 \$ver2 && lt=true"; done
+}
+
+self_tests="$self_tests test_kernel_version_lt"
+
+
+# Some SUSE systems match three packages to the kernel directory.  Selecting
+# the first is not quite right, but doesn't matter on those systems.
+FIND_KERNEL_RPM='rpm_q_out=$(echo $($find_rpm_for_file "$KERN_DIR/kernel")); KERN_PACKAGE=${rpm_q_out%%\ *}'
+FIND_KERNEL_DEB='dpkg_s_out=$($find_deb_for_file "$KERN_DIR/kernel"); KERN_PACKAGE=${dpkg_s_out%\: $KERN_DIR/kernel}'
+
+
+## Determine the command patterns needed to install gcc, make and the kernel
+#  headers on the current distribution.
+#  @note  We want to support the distributions we do with the least possible
+#         special logic, so please do not add new code if existing code can
+#         catch a new distribution (e.g. it is similar to another).
+#  @note  This function is very long, but contains nearly all the distribution-
+#         specific logic in the file.
+#  @param KERN_VER_BASE               The three-point kernel version.
+#  @param GET_KERN_PACKAGE      [out] Command to find the kernel package name
+#                                     given the path $KERN_DIR.
+#  @param PATTERN_GCC_MAKE      [out] A pattern to be resolved to get the
+#                                     command to install gcc and make.
+#  @param PATTERN_HEADERS       [out] A pattern to be resolved to get the
+#                                     command to install the kernel headers for
+#                                     the currently running kernel.
+#  @param PATTERN_HEADERS_META  [out] A pattern to be resolved to get the
+#                                     command to install a dependency on the
+#                                     current kernel headers.  May be empty.
+#  @note These patterns may all depend on $KERN_VER (uname -r output),
+#        $KERN_PACKAGE_BASE (distribution kernel package name without any
+#        version information at all), $KERN_DEBIAN_SUFFIX (the Debian-style
+#        "-generic", "-586" etc kernel name suffix) and $KERN_RPM_SUFFIX
+#        (the kernel-version-plus-rpm-version for the current kernel RPM).
+get_system_information()
+{
+    # SUSE and Man*/Mageia must come before Redhat.
+    if $file_exists /etc/SuSE-release; then  # SUSE-based, before Red Hat
+        GET_KERN_PACKAGE="$FIND_KERNEL_RPM"
+        PATTERN_GCC_MAKE='zypper\ install\ gcc\ make'
+        if kernel_version_lt "$KERN_VER_BASE" '2.6.30'; then
+            PATTERN_HEADERS='zypper\ install\ kernel-source-$KERN_RPM_SUFFIX\ kernel-syms-$KERN_RPM_SUFFIX'
+            PATTERN_HEADERS_META='zypper\ install\ kernel-source\ kernel-syms'
+        else
+            PATTERN_HEADERS='zypper\ install\ ${KERN_PACKAGE_BASE}devel-$KERN_RPM_SUFFIX'
+            PATTERN_HEADERS_META='zypper\ install\ ${KERN_PACKAGE_BASE}devel'
+        fi
+    elif $file_exists /etc/pclinuxos-release; then  # PCLinuxOS - before Mandrake
+        GET_KERN_PACKAGE=
+        PATTERN_GCC_MAKE=
+        PATTERN_HEADERS=
+        PATTERN_HEADERS_META=
+    elif $file_exists /etc/mandrake-release; then  # Mandrake family
+        GET_KERN_PACKAGE="$FIND_KERNEL_RPM"
+        PATTERN_GCC_MAKE='urpmi\ gcc\ make'
+        if kernel_version_lt "$KERN_VER_BASE" '2.6.0'; then
+            PATTERN_HEADERS='urpmi\ kernel-source-$KERN_VER'
+            PATTERN_HEADERS_META='urpmi\ kernel-source'
+        elif kernel_version_lt "$KERN_VER_BASE" '2.6.8'; then
+            PATTERN_HEADERS='urpmi\ kernel-source-stripped-$KERN_VER'
+            PATTERN_HEADERS_META='urpmi\ kernel-source-stripped'
+        # Mandrake/Mandriva had a funny naming scheme for a few kernel versions
+        elif kernel_version_lt "$KERN_VER_BASE" '2.6.17'; then
+            PATTERN_HEADERS='urpmi\ kernel-source-stripped-2.6-${KERN_VER%-*}'
+            PATTERN_HEADERS_META='urpmi\ kernel-source-stripped-2.6'
+        elif kernel_version_lt "$KERN_VER_BASE" '2.6.22'; then
+            PATTERN_HEADERS='urpmi\ kernel-source-stripped-$KERN_RPM_SUFFIX'
+            PATTERN_HEADERS_META='urpmi\ kernel-source-stripped-latest'
+        else
+            PATTERN_HEADERS='urpmi\ ${KERN_PACKAGE_BASE}devel-$KERN_RPM_SUFFIX'
+            PATTERN_HEADERS_META='urpmi\ ${KERN_PACKAGE_BASE}devel-latest'
+        fi
+    elif $file_exists /etc/redhat-release; then  # Red Hat family
+        GET_KERN_PACKAGE="$FIND_KERNEL_RPM"
+        if $do_type yum >/dev/null 2>&1; then
+            PACKAGE_INSTALLER="yum install"
+        else
+            PACKAGE_INSTALLER=up2date
+        fi
+        PATTERN_GCC_MAKE='$PACKAGE_INSTALLER\ gcc\ make'
+        if kernel_version_lt "$KERN_VER_BASE" '2.6.9'; then
+            PATTERN_HEADERS='$PACKAGE_INSTALLER\ kernel-source-$KERN_RPM_SUFFIX'
+            PATTERN_HEADERS_META='$PACKAGE_INSTALLER\ kernel-source'
+        else
+            PATTERN_HEADERS='$PACKAGE_INSTALLER\ ${KERN_PACKAGE_BASE}devel-$KERN_RPM_SUFFIX'
+            PATTERN_HEADERS_META='$PACKAGE_INSTALLER\ ${KERN_PACKAGE_BASE}devel'
+        fi
+    # Ubuntu must come before Debian.
+    elif $string_in_file Ubuntu /etc/lsb-release; then  # Ubuntu before Debian
+        GET_KERN_PACKAGE="$FIND_KERNEL_DEB"
+        PATTERN_GCC_MAKE='apt-get\ install\ gcc\ make'
+        if kernel_version_lt "$KERN_VER_BASE" '2.6.9'; then
+            PATTERN_HEADERS='apt-get\ install\ ${KERN_PACKAGE_BASE%-image*}-headers-$KERN_VER_SHORT$KERN_VER'
+            PATTERN_HEADERS_META='apt-get\ install\ ${KERN_PACKAGE_BASE%-image*}-headers-$KERN_VER_SHORT$KERN_DEBIAN_SUFFIX'
+        else
+            PATTERN_HEADERS='apt-get\ install\ ${KERN_PACKAGE_BASE%-image*}-headers-$KERN_VER'
+            PATTERN_HEADERS_META='apt-get\ install\ ${KERN_PACKAGE_BASE%-image*}-headers$KERN_DEBIAN_SUFFIX'
+        fi
+    elif $file_exists /etc/debian_version; then  # Debian family
+        GET_KERN_PACKAGE="$FIND_KERNEL_DEB"
+        PATTERN_GCC_MAKE='apt-get\ install\ gcc\ make'
+        if kernel_version_lt "$KERN_VER_BASE" '2.4.17'; then
+            PATTERN_HEADERS='apt-get\ install\ ${KERN_PACKAGE_BASE%-image*}-headers-$KERN_VER'
+            PATTERN_HEADERS_META=
+        elif kernel_version_lt "$KERN_VER_BASE" '3.0.0'; then
+            PATTERN_HEADERS='apt-get\ install\ ${KERN_PACKAGE_BASE%-image*}-headers-$KERN_VER'
+            PATTERN_HEADERS_META='apt-get\ install\ ${KERN_PACKAGE_BASE%-image*}-headers-$KERN_VER_SHORT$KERN_DEBIAN_SUFFIX'
+        else
+            PATTERN_HEADERS='apt-get\ install\ ${KERN_PACKAGE_BASE%-image*}-headers-$KERN_VER'
+            PATTERN_HEADERS_META='apt-get\ install\ ${KERN_PACKAGE_BASE%-image*}-headers$KERN_DEBIAN_SUFFIX'
+        fi
+    elif $file_exists /etc/gentoo-release; then  # Gentoo
+        GET_KERN_PACKAGE=
+        PATTERN_GCC_MAKE=
+        PATTERN_HEADERS=
+        PATTERN_HEADERS_META=
+    elif $file_exists /etc/lfs-release -a -d /etc/rc.d/init.d; then  # LFS
+        GET_KERN_PACKAGE=
+        PATTERN_GCC_MAKE=
+        PATTERN_HEADERS=
+        PATTERN_HEADERS_META=
+    elif $file_exists /etc/pardus-release; then  # Pardus
+        GET_KERN_PACKAGE=
+        PATTERN_GCC_MAKE=
+        PATTERN_HEADERS=
+        PATTERN_HEADERS_META=
+    elif $file_exists /etc/slackware-version; then  # Slackware
+        GET_KERN_PACKAGE=
+        PATTERN_GCC_MAKE=
+        PATTERN_HEADERS=
+        PATTERN_HEADERS_META=
+    elif $file_exists /etc/arch-release; then  # Arch Linux
+        GET_KERN_PACKAGE=
+        PATTERN_GCC_MAKE=
+        PATTERN_HEADERS=
+        PATTERN_HEADERS_META=
+    else abort "Linux distribution base type not recognised."
+    fi
+}
+
+
+## Determine the commands needed to install gcc, make and the kernel headers on
+#  the current system.
+#  @param INSTALL_GCC_MAKE      [out] Command to install gcc and make.
+#  @param INSTALL_HEADERS       [out] Command to install gcc and make.
+#  @param INSTALL_HEADERS_META  [out] Command to install a dependency on the
+#                                     current kernel headers.  May be empty.
+generate_install_commands()
+{
+    get_kernel_information
+    get_system_information
+    case "$GET_KERN_PACKAGE" in
+    ?*)
+        eval $GET_KERN_PACKAGE ;;
+    "")
+        abort "Unable to determine the software packaging system in use." ;;
+    esac
+    # Needed for many installers
+    KERN_PACKAGE_BASE="${KERN_PACKAGE%%$KERN_VER_BASE*}"
+    KERN_RPM_SUFFIX="${KERN_PACKAGE#"$KERN_PACKAGE_BASE"}"
+    KERN_DEBIAN_SUFFIX="$(expr "$KERN_VER_EXTRA" : '-[0-9]*\(.*\)')"
+    INSTALL_GCC_MAKE=$(eval echo "$PATTERN_GCC_MAKE")
+    INSTALL_HEADERS=$(eval echo "$PATTERN_HEADERS")
+    INSTALL_HEADERS_META=$(eval echo "$PATTERN_HEADERS_META")
+}
+
+
+test_generate_install_commands()
+{
+    get_kernel_version=test_get_kernel_version
+    file_exists=test_file_exists
+    string_in_file=test_file_exists
+    exit=test_exit
+    do_type=test_type
+    find_rpm_for_file=test_find_rpm_for_file
+    find_deb_for_file=test_find_deb_for_file
+    for i in \
+        "1: test_uname_r=2.4.21-50.EL test_test_f=/etc/redhat-release test_type_binary=yum test_rpm_q=kernel-2.4.21-50.EL test_dpkg_s= =>INSTALL_GCC_MAKE=yum\ install\ gcc\ make INSTALL_HEADERS=yum\ install\ kernel-source-2.4.21-50.EL INSTALL_HEADERS_META=yum\ install\ kernel-source" \
+        "2: test_uname_r=2.6.34-12-default test_test_f=/etc/SuSE-release test_rpm_q=kernel-default-2.6.34-12.3 =>INSTALL_GCC_MAKE=zypper\ install\ gcc\ make INSTALL_HEADERS=zypper\ install\ kernel-default-devel-2.6.34-12.3 INSTALL_HEADERS_META=zypper\ install\ kernel-default-devel" \
+        "3: test_uname_r=2.6.8.1-12mdkenterprise test_test_f=/etc/mandrake-release test_rpm_q=kernel-enterprise-2.6.8.1.12mdk-1-1mdk test_dpkg_s= =>INSTALL_GCC_MAKE=urpmi\ gcc\ make INSTALL_HEADERS=urpmi\ kernel-source-stripped-2.6-2.6.8.1 INSTALL_HEADERS_META=urpmi\ kernel-source-stripped-2.6" \
+        "4: test_uname_r=2.6.26-2-686 test_test_f=/etc/debian_version test_rpm_q= test_dpkg_s=linux-image-2.6.26-2-686:\ /lib/modules/2.6.26-2-686/kernel =>INSTALL_GCC_MAKE=apt-get\ install\ gcc\ make INSTALL_HEADERS=apt-get\ install\ linux-headers-2.6.26-2-686 INSTALL_HEADERS_META=apt-get\ install\ linux-headers-2.6-686" \
+        "5: test_uname_r=3.0.0-15-generic test_string_grep=Ubuntu test_string_file=/etc/lsb-release test_rpm_q= test_dpkg_s=linux-image-3.0.0-15-generic:\ /lib/modules/3.0.0-15-generic/kernel =>INSTALL_GCC_MAKE=apt-get\ install\ gcc\ make INSTALL_HEADERS=apt-get\ install\ linux-headers-3.0.0-15-generic INSTALL_HEADERS_META=apt-get\ install\ linux-headers-generic" \
+        "6: test_uname_r=2.4.16-686-smp test_test_f=/etc/debian_version test_rpm_q= test_dpkg_s=kernel-image-2.4.16-686-smp =>INSTALL_GCC_MAKE=apt-get\ install\ gcc\ make INSTALL_HEADERS=apt-get\ install\ kernel-headers-2.4.16-686-smp INSTALL_HEADERS_META=" \
+        "7: test_uname_r=2.6.38.8-desktop-9.mga test_test_f=/etc/mandrake-release test_rpm_q=kernel-desktop-2.6.38.8-9.mga-1-1.mga1 test_dpkg_s= =>INSTALL_GCC_MAKE=urpmi\ gcc\ make INSTALL_HEADERS=urpmi\ kernel-desktop-devel-2.6.38.8-9.mga-1-1.mga1 INSTALL_HEADERS_META=urpmi\ kernel-desktop-devel-latest" \
+        "8: test_uname_r=2.6.17-13mdv test_test_f=/etc/mandrake-release test_rpm_q=kernel-2.6.17.13mdv-1-1mdv2007.1 test_dpkg_s= =>INSTALL_GCC_MAKE=urpmi\ gcc\ make INSTALL_HEADERS=urpmi\ kernel-source-stripped-2.6.17.13mdv-1-1mdv2007.1 INSTALL_HEADERS_META=urpmi\ kernel-source-stripped-latest" \
+        "9: test_uname_r=2.6.27.7-9-default test_test_f=/etc/SuSE-release test_rpm_q=kernel-default-base-2.6.27.7-9.1\ kernel-default-2.6.27.7-9.1\ kernel-default-extra-2.6.27.7-9.1 test_dpkg_s= =>INSTALL_GCC_MAKE=zypper\ install\ gcc\ make INSTALL_HEADERS=zypper\ install\ kernel-source-2.6.27.7-9.1\ kernel-syms-2.6.27.7-9.1 INSTALL_HEADERS_META=zypper\ install\ kernel-source\ kernel-syms" \
+        "10: test_exit_return= test_test_f=/etc/Windows-release =>test_exit_return=1"
+    do eval_test_line "$i" "generate_install_commands 2> /dev/null"; done
+}
+
+self_tests="$self_tests test_generate_install_commands"
+
+
+## Check whether gcc, make and the kernel headers are installed on the system.
+# @param MISSING_GCC     [out]  non-empty if make needs to be installed.
+#                               @todo Should we check the version of gcc?
+# @param MISSING_MAKE    [out]  non-empty if make needs to be installed.
+# @param MISSING_HEADERS [out]  non-empty if kernel headers need to be
+#                               installed.
+check_missing_packages()
+{
+    if $do_type gcc >/dev/null 2>&1; then
+        MISSING_GCC=
+    else
+        MISSING_GCC=gcc
+    fi
+    if $do_type make >/dev/null 2>&1; then
+        MISSING_MAKE=
+    else
+        MISSING_MAKE=make
+    fi
+    # The following test looks valid on all distributions I have checked so
+    # far.
+    MISSING_HEADERS=$($file_exists "$KERN_DIR"/build/Makefile || echo headers)
+}
+
+
+case "$1" in livetest) LIVE_TEST=true ;; *) LIVE_TEST= ;; esac
+case "$1" in
+test)
+    for i in $self_tests; do $i; done ;;
+*)
+    set_up_helpers
+    get_kernel_information
+    check_missing_packages
+    case "$MISSING_GCC$MISSING_MAKE$MISSING_HEADERS$LIVE_TEST" in "")
+        exit 0
+    esac
+    generate_install_commands
+    case "$1" in install)
+        check_root
+        $INSTALL_GCC_MAKE || abort "Unable to install tools for building kernel modules."
+        case "$INSTALL_HEADERS_META" in
+        "")
+            $INSTALL_HEADERS || abort "Unable to install files needed to build modules for the current kernel." ;;
+        *)
+            $INSTALL_HEADERS || printf >&2 "Unable to install files needed to build modules for the current kernel.\nYou may need to restart your system to complete the installation."
+            $INSTALL_HEADERS_META || abort "Unable to install files needed to build kernel modules."
+        esac
+        ;;
+    *)
+        echo "This system is not currently set up to build kernel modules (system extensions)."
+        echo "Running the following commands should set the system up correctly:"
+        echo
+        case "$MISSING_GCC$MISSING_MAKE$LIVE_TEST" in ?*)
+            echo "  $INSTALL_GCC_MAKE" ;;
+        esac
+        case "$MISSING_HEADERS$LIVE_TEST" in ?*)
+            echo "  $INSTALL_HEADERS"
+            echo "(The last command may fail if your system is not fully updated.)"
+            case "$INSTALL_HEADERS_META" in ?*)
+                echo "  $INSTALL_HEADERS_META" ;;
+            esac
+            ;;
+        esac
+        exit 1
+        ;;
+    esac
+    ;;
+esac