devel/get-compat-kernels - pub/scm/linux/kernel/git/mcgrof/backports - Git at Google

 #!/bin/bash
 #
 # Copyright (C) 2012, Luis R. Rodriguez <mcgrof@do-not-panic.com>
 #
 # This program is free software; you can redistribute it and/or modify
 # it under the terms of the GNU General Public License version 2 as
 # published by the Free Software Foundation.
 #
 # You can use this script to install all mainline kernels used
 # to test compile the Linux kernel compatibility module. You can
 # then use ckmake to cross compile against all supported kernels.

 # Pretty colors
 GREEN="\033[01;32m"
 YELLOW="\033[01;33m"
 NORMAL="\033[00m"
 BLUE="\033[34m"
 RED="\033[31m"
 PURPLE="\033[35m"
 CYAN="\033[36m"
 UNDERLINE="\033[02m"

 KERNELS=""
 KPATH="http://kernel.ubuntu.com/~kernel-ppa/mainline/"

 FORCE="0"
 KSRC_PREFIX=
 # Check whether we're running as root or not
 # If we're root stuff things into /usr/src and /lib/modules
 # else, use $HOME/compat-ksrc for enabling user-mode builds.
 if [[ "$EUID" != "0" ]]; then
 	KSRC_PREFIX="$HOME/compat-ksrc"
 else
 	KSRC_PREFIX="${PWD}/compat-ksrc"
 fi


 # Create target directories if they doesn't exist
 mkdir -p $KSRC_PREFIX/{usr/src,lib/modules}

 # List of currently supported kernels that will be downloaded
 KERNELS="$KERNELS ${KPATH}/v2.6.24/linux-headers-2.6.24-020624_2.6.24-020624_all.deb"
 KERNELS="$KERNELS ${KPATH}/v2.6.25/linux-headers-2.6.25-020625_2.6.25-020625_all.deb"
 KERNELS="$KERNELS ${KPATH}/v2.6.26/linux-headers-2.6.26-020626_2.6.26-020626_all.deb"
 KERNELS="$KERNELS ${KPATH}/v2.6.27/linux-headers-2.6.27-020627_2.6.27-020627_all.deb"
 KERNELS="$KERNELS ${KPATH}/v2.6.28.10/linux-headers-2.6.28-02062810_2.6.28-02062810_all.deb"
 KERNELS="$KERNELS ${KPATH}/v2.6.29.6/linux-headers-2.6.29-02062906_2.6.29-02062906_all.deb"
 KERNELS="$KERNELS ${KPATH}/v2.6.30.10/linux-headers-2.6.30-02063010_2.6.30-02063010_all.deb"
 KERNELS="$KERNELS ${KPATH}/v2.6.31.13-karmic/linux-headers-2.6.31-02063113_2.6.31-02063113_all.deb"
 KERNELS="$KERNELS ${KPATH}/v2.6.32.61-lucid/linux-headers-2.6.32-02063261_2.6.32-02063261.201306101105_all.deb"
 KERNELS="$KERNELS ${KPATH}/v2.6.33.20-maverick/linux-headers-2.6.33-02063320_2.6.33-02063320.201111071735_all.deb"
 KERNELS="$KERNELS ${KPATH}/v2.6.34.14-maverick/linux-headers-2.6.34-02063414_2.6.34-02063414.201301162135_all.deb"
 KERNELS="$KERNELS ${KPATH}/v2.6.35.13-original-maverick/linux-headers-2.6.35-02063513_2.6.35-02063513.201107261012_all.deb"
 KERNELS="$KERNELS ${KPATH}/v2.6.36.4-natty/linux-headers-2.6.36-02063604_2.6.36-02063604.201102180911_all.deb"
 KERNELS="$KERNELS ${KPATH}/v2.6.37.6-natty/linux-headers-2.6.37-02063706_2.6.37-02063706.201103281005_all.deb"
 KERNELS="$KERNELS ${KPATH}/v2.6.38.8-natty/linux-headers-2.6.38-02063808_2.6.38-02063808.201106040910_all.deb"
 KERNELS="$KERNELS ${KPATH}/v2.6.39.4-oneiric/linux-headers-2.6.39-02063904_2.6.39-02063904.201108040905_all.deb"
 KERNELS="$KERNELS ${KPATH}/v3.0.101-oneiric/linux-headers-3.0.101-0300101_3.0.101-0300101.201310220446_all.deb"
 KERNELS="$KERNELS ${KPATH}/v3.1.10-precise/linux-headers-3.1.10-030110_3.1.10-030110.201201181135_all.deb"
 KERNELS="$KERNELS ${KPATH}/v3.2.52-precise/linux-headers-3.2.52-030252_3.2.52-030252.201310262335_all.deb"
 KERNELS="$KERNELS ${KPATH}/v3.3.8-quantal/linux-headers-3.3.8-030308_3.3.8-030308.201206041356_all.deb"
 KERNELS="$KERNELS ${KPATH}/v3.4.67-quantal/linux-headers-3.4.67-030467_3.4.67-030467.201310220531_all.deb"
 KERNELS="$KERNELS ${KPATH}/v3.5.7.12-quantal/linux-headers-3.5.7-03050712_3.5.7-03050712.201305111435_all.deb"
 KERNELS="$KERNELS ${KPATH}/v3.6.11-raring/linux-headers-3.6.11-030611_3.6.11-030611.201212171335_all.deb"
 KERNELS="$KERNELS ${KPATH}/v3.7.10-raring/linux-headers-3.7.10-030710_3.7.10-030710.201302271235_all.deb"
 KERNELS="$KERNELS ${KPATH}/v3.8.13-raring/linux-headers-3.8.13-030813_3.8.13-030813.201305111843_all.deb"
 KERNELS="$KERNELS ${KPATH}/v3.9.11-saucy/linux-headers-3.9.11-030911_3.9.11-030911.201307202035_all.deb"
 KERNELS="$KERNELS ${KPATH}/v3.10.17-saucy/linux-headers-3.10.17-031017_3.10.17-031017.201310181435_all.deb"
 KERNELS="$KERNELS ${KPATH}/v3.11.6-saucy/linux-headers-3.11.6-031106_3.11.6-031106.201310181453_all.deb"
 KERNELS="$KERNELS ${KPATH}/v3.12-rc7-saucy/linux-headers-3.12.0-031200rc7_3.12.0-031200rc7.201310271935_all.deb"

 # Number of kernels
 NUM_KERNELS=$(echo $KERNELS | wc -w)

 # ~ 101 MiB for installed space on $KSRC_PREFIX/usr/src/ and $KSRC_PREFIX/lib/modules/
 SPACE_PER_KERNEL="101"

 # ~13 MiB of both deb files
 SPACE_PER_KERNEL_DEB="13"

 function get_ubuntu_kernels() {

 	ARCH=$(uname -m)
 	TARGET=""

 	case $ARCH in
 	"x86_64")
 		TARGET="amd64"
 		;;
 	"i686")
 		TARGET="i386"
 		;;
 	*)
 		echo -e "Unsupported architecture"
 		exit
 		;;
 	esac

 	mkdir -p debs
 	cd debs

 	for i in $KERNELS; do
 		FILE=$(basename $i)
 		PKG=$(echo $FILE | awk -F"_" '{print $1}')

 		# Do not download if installed or deb exists
 		if [[ ! -d $KSRC_PREFIX/usr/src/$PKG && ! -f $FILE ]]; then
 			# Download the _all.deb
 			wget -c $i

 			# Download the generic-ARCH headers
 			GENERIC_DEB=`echo $i | sed -e "s:\(.*\)_\(.*\)_all.deb:\1-generic_\2_$TARGET.deb:"`
 			wget -c $GENERIC_DEB
 		fi
 	done

 	# List of downloaded debs
 	DEB_LIST=`ls linux-*.deb 2>/dev/null`

 	if [[ -z $DEB_LIST ]]; then
 		echo "All kernel sources are found in $KSRC_PREFIX/usr/src."
 		exit
 	fi

 	# Create a temporary directory first
 	TEMP_DIR=`mktemp -d`

 	for deb in $DEB_LIST; do
 		DIR_NAME=$(echo $deb | awk -F"_" '{print $1}')
 		if [[ ! -d $KSRC_PREFIX/usr/src/$DIR_NAME ]]; then
 			echo "Extracting $deb..."
 			ar p $deb data.tar.gz | tar xz --exclude=usr/share -C $TEMP_DIR
 		fi
 	done

 	# Move the extracted folders into the system
 	if [[ -d $TEMP_DIR/lib/modules ]]; then

 		# Relink lib/modules/*/build/ directories relatively to make it work
 		# for regular user based workflows
 		if [[ -n $KSRC_PREFIX ]]; then
 			echo "Adjusting build/ symlinks for non-root installation..."

 			for kernel in $(ls -d $TEMP_DIR/lib/modules/*generic); do
 				unlink $kernel/build
 				ln -s ../../../usr/src/linux-headers-`basename $kernel` $kernel/build
 			done
 		fi

 		mv $TEMP_DIR/lib/modules/* $KSRC_PREFIX/lib/modules
 	fi
 	if [[ -d $TEMP_DIR/usr/src ]]; then
 		# Because of a bug in make < 3.82, mixed implicit and normal
 		# rules do not cause harm. Since the bug is fixed in the new make
 		# we have to adjust older kernel's Makefiles to fix the bug.
 		sed -i 's#^/ %/:#%/:#' $TEMP_DIR/usr/src/linux-headers-2.6.2[45678]-0*/Makefile &>/dev/null

 		mv $TEMP_DIR/usr/src/* $KSRC_PREFIX/usr/src
 	fi

 	# Remove the temporary directory
 	rm -rf $TEMP_DIR
 }

 function rebuild_header_binary_deps() {
 	if [[ ! -d ${KSRC_PREFIX}/lib/modules/ ]]; then
 		echo "You do not seem to have any vanilla kernels available to fix"
 		exit 1
 	fi

 	COUNT=$(ls -d ${KSRC_PREFIX}/lib/modules/*generic | wc -l)
 	if [[ $COUNT -le 0 ]]; then
 		echo "You do not seem to have any vanilla kernels available to fix"
 		exit 1
 	fi

 	for kernel in $(ls -d ${KSRC_PREFIX}/lib/modules/*generic | grep -E "/3\.[2-9]\.|/3\.[1-9][0-9]\.|/[4-9]\."); do
 		echo $kernel

 		count=0
 		while [[ $count -ne 4 ]]; do
 			for i in basic mod genksyms; do
 				if [[ $count -eq 0 ]]; then
 					make -C ${kernel}/build/ M=scripts/${i}/ clean > /dev/null 2>&1
 				fi
 				make -C ${kernel}/build/ M=scripts/${i}/ > /dev/null 2>&1
 			done
 			let count=$count+1
 		done
 	done
 }

 function usage() {
 	echo -e "Usage: $0 [ -r ] [ -f ] "
 	echo -e "-r Rebuilds binaries required in kernel headers. Use"
 	echo -e "   this option if you've already ran this script and"
 	echo -e "   just need to fix the libc versions against which"
 	echo -e "   the binaries in the headers files are linked against. "
 	echo -e "   This was added since kernels >= 3.4 require"
 	echo -e "   a glibc >= 2.14 for memcpy(), and not all Linux"
 	echo -e "   distributions have such versions of glibc."
 	echo -e ""
 	echo -e "-f Force running, do not ask"
 }

 if [[ $# -gt 3 ]]; then
 	usage
 	exit 1
 fi

 if [[ $1 == "-r" ]]; then
 	rebuild_header_binary_deps
 	exit
 fi

 if [[ $1 == "-f" ]]; then
 	FORCE="1"
 	shift
 fi

 # Check for the availability of 'ar' before continuing
 which ar 2>&1 > /dev/null
 if [[ $? -ne 0 ]]; then
 	echo -e "${GREEN}ar${NORMAL} is not avilable, typically this is available through a package called binutils"
 	echo -e "Install binutils and run this script again..."
 	exit 1
 fi

 echo -e ""

 if [[ ! -n $KSRC_PREFIX ]]; then
 	echo -e "** Running as a privileged user!"
 	echo -e "** You are trying to force using ${BLUE}${KSRC_PREFIX}/lib/modules${NORMAL} and ${BLUE}${KSRC_PREFIX}/usr/src${NORMAL} ..."
 	echo -e "** This is a terrible idea. Consider running as a regular user."
 	echo -e ""
 	read -p "Do you still want to continue (y/N)? "
 	if [[ "${REPLY}" != "y" ]]; then
 		echo -e "Bailing out !"
 		exit 1
 	fi
 fi

 echo -e "This will download ${YELLOW}${NUM_KERNELS}${NORMAL} kernel headers to allow you to"
 echo -e "cross compile any module over these kernels with ${GREEN}ckmake${NORMAL}."
 echo -e "The download payload is about ${YELLOW}~ $((${SPACE_PER_KERNEL_DEB} * ${NUM_KERNELS})) ${CYAN}MiB${NORMAL}, once uncompressed"
 echo -e "it will stash kernel header files under ${BLUE}$KSRC_PREFIX/usr/src/${NORMAL}"
 echo -e "and ${BLUE}$KSRC_PREFIX/lib/modules/${NORMAL} and consume about ~ ${YELLOW}$((${NUM_KERNELS} * ${SPACE_PER_KERNEL})) ${RED}MiB${NORMAL} of space."
 echo -e ""
 echo -e "The kernel headers used are from ${PURPLE}${UNDERLINE}Vanilla${NORMAL} kernels"
 echo -e "from the Ubuntu mainline / vanilla kernel PPA and are extracted"
 echo -e "using ${GREEN}ar${NORMAL} and ${GREEN}tar${NORMAL}:"
 echo -e ""
 echo -e "${BLUE}http://kernel.ubuntu.com/~kernel-ppa/mainline/${NORMAL}"
 echo -e ""

 if [[ "$FORCE" != "1" ]]; then
 	read -p "Do you still want to continue (y/N)? "
 	if [[ "${REPLY}" != "y" ]]; then
 		echo -e "Bailing out !"
 		exit 1
 	fi
 fi

 get_ubuntu_kernels
 echo -e "Vanilla kernels headers ${BLUE}installed${NORMAL}, "
 echo -e "now going to ${GREEN}rebuild${NORMAL} some binary dependencies..."
 sleep 1
 rebuild_header_binary_deps
	#!/bin/bash
	#
	# Copyright (C) 2012, Luis R. Rodriguez <mcgrof@do-not-panic.com>
	#
	# This program is free software; you can redistribute it and/or modify
	# it under the terms of the GNU General Public License version 2 as
	# published by the Free Software Foundation.
	#
	# You can use this script to install all mainline kernels used
	# to test compile the Linux kernel compatibility module. You can
	# then use ckmake to cross compile against all supported kernels.

	# Pretty colors
	GREEN="\033[01;32m"
	YELLOW="\033[01;33m"
	NORMAL="\033[00m"
	BLUE="\033[34m"
	RED="\033[31m"
	PURPLE="\033[35m"
	CYAN="\033[36m"
	UNDERLINE="\033[02m"

	KERNELS=""
	KPATH="http://kernel.ubuntu.com/~kernel-ppa/mainline/"

	FORCE="0"
	KSRC_PREFIX=
	# Check whether we're running as root or not
	# If we're root stuff things into /usr/src and /lib/modules
	# else, use $HOME/compat-ksrc for enabling user-mode builds.
	if [[ "$EUID" != "0" ]]; then
	KSRC_PREFIX="$HOME/compat-ksrc"
	else
	KSRC_PREFIX="${PWD}/compat-ksrc"
	fi


	# Create target directories if they doesn't exist
	mkdir -p $KSRC_PREFIX/{usr/src,lib/modules}

	# List of currently supported kernels that will be downloaded
	KERNELS="$KERNELS ${KPATH}/v2.6.24/linux-headers-2.6.24-020624_2.6.24-020624_all.deb"
	KERNELS="$KERNELS ${KPATH}/v2.6.25/linux-headers-2.6.25-020625_2.6.25-020625_all.deb"
	KERNELS="$KERNELS ${KPATH}/v2.6.26/linux-headers-2.6.26-020626_2.6.26-020626_all.deb"
	KERNELS="$KERNELS ${KPATH}/v2.6.27/linux-headers-2.6.27-020627_2.6.27-020627_all.deb"
	KERNELS="$KERNELS ${KPATH}/v2.6.28.10/linux-headers-2.6.28-02062810_2.6.28-02062810_all.deb"
	KERNELS="$KERNELS ${KPATH}/v2.6.29.6/linux-headers-2.6.29-02062906_2.6.29-02062906_all.deb"
	KERNELS="$KERNELS ${KPATH}/v2.6.30.10/linux-headers-2.6.30-02063010_2.6.30-02063010_all.deb"
	KERNELS="$KERNELS ${KPATH}/v2.6.31.13-karmic/linux-headers-2.6.31-02063113_2.6.31-02063113_all.deb"
	KERNELS="$KERNELS ${KPATH}/v2.6.32.61-lucid/linux-headers-2.6.32-02063261_2.6.32-02063261.201306101105_all.deb"
	KERNELS="$KERNELS ${KPATH}/v2.6.33.20-maverick/linux-headers-2.6.33-02063320_2.6.33-02063320.201111071735_all.deb"
	KERNELS="$KERNELS ${KPATH}/v2.6.34.14-maverick/linux-headers-2.6.34-02063414_2.6.34-02063414.201301162135_all.deb"
	KERNELS="$KERNELS ${KPATH}/v2.6.35.13-original-maverick/linux-headers-2.6.35-02063513_2.6.35-02063513.201107261012_all.deb"
	KERNELS="$KERNELS ${KPATH}/v2.6.36.4-natty/linux-headers-2.6.36-02063604_2.6.36-02063604.201102180911_all.deb"
	KERNELS="$KERNELS ${KPATH}/v2.6.37.6-natty/linux-headers-2.6.37-02063706_2.6.37-02063706.201103281005_all.deb"
	KERNELS="$KERNELS ${KPATH}/v2.6.38.8-natty/linux-headers-2.6.38-02063808_2.6.38-02063808.201106040910_all.deb"
	KERNELS="$KERNELS ${KPATH}/v2.6.39.4-oneiric/linux-headers-2.6.39-02063904_2.6.39-02063904.201108040905_all.deb"
	KERNELS="$KERNELS ${KPATH}/v3.0.101-oneiric/linux-headers-3.0.101-0300101_3.0.101-0300101.201310220446_all.deb"
	KERNELS="$KERNELS ${KPATH}/v3.1.10-precise/linux-headers-3.1.10-030110_3.1.10-030110.201201181135_all.deb"
	KERNELS="$KERNELS ${KPATH}/v3.2.52-precise/linux-headers-3.2.52-030252_3.2.52-030252.201310262335_all.deb"
	KERNELS="$KERNELS ${KPATH}/v3.3.8-quantal/linux-headers-3.3.8-030308_3.3.8-030308.201206041356_all.deb"
	KERNELS="$KERNELS ${KPATH}/v3.4.67-quantal/linux-headers-3.4.67-030467_3.4.67-030467.201310220531_all.deb"
	KERNELS="$KERNELS ${KPATH}/v3.5.7.12-quantal/linux-headers-3.5.7-03050712_3.5.7-03050712.201305111435_all.deb"
	KERNELS="$KERNELS ${KPATH}/v3.6.11-raring/linux-headers-3.6.11-030611_3.6.11-030611.201212171335_all.deb"
	KERNELS="$KERNELS ${KPATH}/v3.7.10-raring/linux-headers-3.7.10-030710_3.7.10-030710.201302271235_all.deb"
	KERNELS="$KERNELS ${KPATH}/v3.8.13-raring/linux-headers-3.8.13-030813_3.8.13-030813.201305111843_all.deb"
	KERNELS="$KERNELS ${KPATH}/v3.9.11-saucy/linux-headers-3.9.11-030911_3.9.11-030911.201307202035_all.deb"
	KERNELS="$KERNELS ${KPATH}/v3.10.17-saucy/linux-headers-3.10.17-031017_3.10.17-031017.201310181435_all.deb"
	KERNELS="$KERNELS ${KPATH}/v3.11.6-saucy/linux-headers-3.11.6-031106_3.11.6-031106.201310181453_all.deb"
	KERNELS="$KERNELS ${KPATH}/v3.12-rc7-saucy/linux-headers-3.12.0-031200rc7_3.12.0-031200rc7.201310271935_all.deb"

	# Number of kernels
	NUM_KERNELS=$(echo $KERNELS \| wc -w)

	# ~ 101 MiB for installed space on $KSRC_PREFIX/usr/src/ and $KSRC_PREFIX/lib/modules/
	SPACE_PER_KERNEL="101"

	# ~13 MiB of both deb files
	SPACE_PER_KERNEL_DEB="13"

	function get_ubuntu_kernels() {

	ARCH=$(uname -m)
	TARGET=""

	case $ARCH in
	"x86_64")
	TARGET="amd64"
	;;
	"i686")
	TARGET="i386"
	;;
	*)
	echo -e "Unsupported architecture"
	exit
	;;
	esac

	mkdir -p debs
	cd debs

	for i in $KERNELS; do
	FILE=$(basename $i)
	PKG=$(echo $FILE \| awk -F"_" '{print $1}')

	# Do not download if installed or deb exists
	if [[ ! -d $KSRC_PREFIX/usr/src/$PKG && ! -f $FILE ]]; then
	# Download the _all.deb
	wget -c $i

	# Download the generic-ARCH headers
	GENERIC_DEB=`echo $i \| sed -e "s:\(.\)_\(.\)_all.deb:\1-generic_\2_$TARGET.deb:"`
	wget -c $GENERIC_DEB
	fi
	done

	# List of downloaded debs
	DEB_LIST=`ls linux-*.deb 2>/dev/null`

	if [[ -z $DEB_LIST ]]; then
	echo "All kernel sources are found in $KSRC_PREFIX/usr/src."
	exit
	fi

	# Create a temporary directory first
	TEMP_DIR=`mktemp -d`

	for deb in $DEB_LIST; do
	DIR_NAME=$(echo $deb \| awk -F"_" '{print $1}')
	if [[ ! -d $KSRC_PREFIX/usr/src/$DIR_NAME ]]; then
	echo "Extracting $deb..."
	ar p $deb data.tar.gz \| tar xz --exclude=usr/share -C $TEMP_DIR
	fi
	done

	# Move the extracted folders into the system
	if [[ -d $TEMP_DIR/lib/modules ]]; then

	# Relink lib/modules/*/build/ directories relatively to make it work
	# for regular user based workflows
	if [[ -n $KSRC_PREFIX ]]; then
	echo "Adjusting build/ symlinks for non-root installation..."

	for kernel in $(ls -d $TEMP_DIR/lib/modules/*generic); do
	unlink $kernel/build
	ln -s ../../../usr/src/linux-headers-`basename $kernel` $kernel/build
	done
	fi

	mv $TEMP_DIR/lib/modules/* $KSRC_PREFIX/lib/modules
	fi
	if [[ -d $TEMP_DIR/usr/src ]]; then
	# Because of a bug in make < 3.82, mixed implicit and normal
	# rules do not cause harm. Since the bug is fixed in the new make
	# we have to adjust older kernel's Makefiles to fix the bug.
	sed -i 's#^/ %/:#%/:#' $TEMP_DIR/usr/src/linux-headers-2.6.2[45678]-0*/Makefile &>/dev/null

	mv $TEMP_DIR/usr/src/* $KSRC_PREFIX/usr/src
	fi

	# Remove the temporary directory
	rm -rf $TEMP_DIR
	}

	function rebuild_header_binary_deps() {
	if [[ ! -d ${KSRC_PREFIX}/lib/modules/ ]]; then
	echo "You do not seem to have any vanilla kernels available to fix"
	exit 1
	fi

	COUNT=$(ls -d ${KSRC_PREFIX}/lib/modules/*generic \| wc -l)
	if [[ $COUNT -le 0 ]]; then
	echo "You do not seem to have any vanilla kernels available to fix"
	exit 1
	fi

	for kernel in $(ls -d ${KSRC_PREFIX}/lib/modules/*generic \| grep -E "/3\.[2-9]\.\|/3\.[1-9][0-9]\.\|/[4-9]\."); do
	echo $kernel

	count=0
	while [[ $count -ne 4 ]]; do
	for i in basic mod genksyms; do
	if [[ $count -eq 0 ]]; then
	make -C ${kernel}/build/ M=scripts/${i}/ clean > /dev/null 2>&1
	fi
	make -C ${kernel}/build/ M=scripts/${i}/ > /dev/null 2>&1
	done
	let count=$count+1
	done
	done
	}

	function usage() {
	echo -e "Usage: $0 [ -r ] [ -f ] "
	echo -e "-r Rebuilds binaries required in kernel headers. Use"
	echo -e " this option if you've already ran this script and"
	echo -e " just need to fix the libc versions against which"
	echo -e " the binaries in the headers files are linked against. "
	echo -e " This was added since kernels >= 3.4 require"
	echo -e " a glibc >= 2.14 for memcpy(), and not all Linux"
	echo -e " distributions have such versions of glibc."
	echo -e ""
	echo -e "-f Force running, do not ask"
	}

	if [[ $# -gt 3 ]]; then
	usage
	exit 1
	fi

	if [[ $1 == "-r" ]]; then
	rebuild_header_binary_deps
	exit
	fi

	if [[ $1 == "-f" ]]; then
	FORCE="1"
	shift
	fi

	# Check for the availability of 'ar' before continuing
	which ar 2>&1 > /dev/null
	if [[ $? -ne 0 ]]; then
	echo -e "${GREEN}ar${NORMAL} is not avilable, typically this is available through a package called binutils"
	echo -e "Install binutils and run this script again..."
	exit 1
	fi

	echo -e ""

	if [[ ! -n $KSRC_PREFIX ]]; then
	echo -e "** Running as a privileged user!"
	echo -e "** You are trying to force using ${BLUE}${KSRC_PREFIX}/lib/modules${NORMAL} and ${BLUE}${KSRC_PREFIX}/usr/src${NORMAL} ..."
	echo -e "** This is a terrible idea. Consider running as a regular user."
	echo -e ""
	read -p "Do you still want to continue (y/N)? "
	if [[ "${REPLY}" != "y" ]]; then
	echo -e "Bailing out !"
	exit 1
	fi
	fi

	echo -e "This will download ${YELLOW}${NUM_KERNELS}${NORMAL} kernel headers to allow you to"
	echo -e "cross compile any module over these kernels with ${GREEN}ckmake${NORMAL}."
	echo -e "The download payload is about ${YELLOW}~ $((${SPACE_PER_KERNEL_DEB} * ${NUM_KERNELS})) ${CYAN}MiB${NORMAL}, once uncompressed"
	echo -e "it will stash kernel header files under ${BLUE}$KSRC_PREFIX/usr/src/${NORMAL}"
	echo -e "and ${BLUE}$KSRC_PREFIX/lib/modules/${NORMAL} and consume about ~ ${YELLOW}$((${NUM_KERNELS} * ${SPACE_PER_KERNEL})) ${RED}MiB${NORMAL} of space."
	echo -e ""
	echo -e "The kernel headers used are from ${PURPLE}${UNDERLINE}Vanilla${NORMAL} kernels"
	echo -e "from the Ubuntu mainline / vanilla kernel PPA and are extracted"
	echo -e "using ${GREEN}ar${NORMAL} and ${GREEN}tar${NORMAL}:"
	echo -e ""
	echo -e "${BLUE}http://kernel.ubuntu.com/~kernel-ppa/mainline/${NORMAL}"
	echo -e ""

	if [[ "$FORCE" != "1" ]]; then
	read -p "Do you still want to continue (y/N)? "
	if [[ "${REPLY}" != "y" ]]; then
	echo -e "Bailing out !"
	exit 1
	fi
	fi

	get_ubuntu_kernels
	echo -e "Vanilla kernels headers ${BLUE}installed${NORMAL}, "
	echo -e "now going to ${GREEN}rebuild${NORMAL} some binary dependencies..."
	sleep 1
	rebuild_header_binary_deps