# Maintainer: xduugu
_pkgext=-git
pkgbase=linux$_pkgext
pkgname=$pkgbase

# required by AUR
# comment the following line to build a single package containing the kernel and the headers
(( 1 )) && pkgname=("$pkgbase" "$pkgbase-headers" "$pkgbase-docs")
pkgdesc="The Linux Kernel and modules from Linus' git tree"
depends=('coreutils' 'linux-firmware-git' 'mkinitcpio')

pkgver=20121225
pkgrel=1
url="http://www.kernel.org/"
arch=(i686 x86_64)
license=('GPL2')
makedepends=('git')
options=(!strip)
source=(config.{i686,x86_64})
md5sums=('1b7c79c377c52314489c62edfb18287f'
         'ab11879c6b02054615ca3ea84a79b7c4')
sha256sums=('ddcb6aa5811533adbb82f0bed7092bc4df04984952522d2ac0da6c2509414733'
            '8a879350dfc29b716c16677cbb9500d367cc216ac2a6be391bf7f317942729c6')

_gitroot="git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git"
_gitname="linux.git"

# set _gitrev to a git revision (man gitrevisions) like a tag, a commit sha1
# hash or a branch name to build from this tree instead of master

# _gitrev=""

####################################################################
# KERNEL CONFIG FILES
#
# This PKGBUILD searches for config files in the current directory
# and will use the first one it finds from the following
# list as base configuration:
# 	config.local
# 	config.saved.$CARCH
# 	config.$CARCH
#
####################################################################


#############################################################
# PATCHES
#
# This package builds the vanilla git kernel by default,
# but it is possible to patch the source without modifying
# this PKGBUILD.
#
# Simply create a directory 'patches' in your PKGBUILD
# directory and _any_ file (dotfiles excluded) in this
# folder will be applied to the kernel source.
#
# Prefixing the patch file names with dots will obviously
# excluded them from the patching process.
#
#############################################################


#############################
# CONFIGURATION
#
# Uncomment desired options
#############################


#######
# Set to e.g. menuconfig, xconfig or gconfig
#
# For a full list of supported commands, please have a look
# at "Configuration targets" section of `make help`'s output
# or the help target in scripts/kconfig/Makefile
# http://git.kernel.org/?p=linux/kernel/git/torvalds/linux.git;a=blob;f=scripts/kconfig/Makefile
#
# If unset or set to an empty or space-only string, the
# (manual) kernel configuration step will be skipped.
#
_config_cmd="${_config_cmd:-xconfig}"


#######
# The directory where the kernel should be built
#
# Can be useful, for example, if you want to compile on a
# tmpfs mount, which can speed up the compilation process
#
_build_dir="${_build_dir:-$srcdir}"


#######
# Stop build process after kernel configuration
#
# This option enables _save_config implicitly.
#
# _configure_only=1


#######
# Append the date to the localversion
#
#	e.g. -ARCH -> -ARCH-20090422
#
# _date_localversion=1


#######
# Set the pkgver to the kernel version
# rather than the build date
#
# _kernel_pkgver=1


#######
# Save the .config file to package directory
# as config.saved.$CARCH
#
# _save_config=1


#######
# Do not compress kernel modules
#
# _no_modules_compression=1


#######
# Make the kernel build process verbose
#
# _verbose=1


# internal variables
if [[ -n $_gitname && -n $_gitroot ]]; then
	(( 1 )) && _kernel_src="$_build_dir/$_gitname-build"
else
	(( 1 )) && _kernel_src="$_build_dir/$(find . -maxdepth 1 -type d -name "linux-*" -printf "%f\n" | head -1)"
fi

#######
# define required functions

# single package
package() {
	eval package_$pkgbase-headers
	eval package_$pkgbase
}

# split package functions
eval "package_$pkgbase() { _generic_package_linux; }"
eval "package_$pkgbase-headers() { _generic_package_linux-headers; }"
eval "package_$pkgbase-docs() { _generic_package_linux-docs; }"


##############################
# where the magic happens...
##############################
build() {
	if [[ -n $_gitname && -n $_gitroot ]]; then
		#################################
		# Get the latest kernel sources
		#################################
		msg "Fetching sources..."

		cd "$startdir"
		if [[ -d $_gitname ]]; then
			msg2 "Updating sources..."
			cd "$_gitname"
			git fetch || true
			cd "$OLDPWD"
		else
			msg2 "Cloning the project..."
			warning "The initial clone will download approximately 500 mb"
			git clone --mirror "$_gitroot" "$_gitname"
		fi

		msg "Creating build branch..."
		rm -rf "$_kernel_src"
		git clone "$_gitname" "$_kernel_src"

		# reset to specified git revision
		cd "$_kernel_src"
		[[ -n $_gitrev ]] && git reset --hard "$_gitrev"
	fi

	cd "$_kernel_src"

	#################
	# Apply patches
	#################
	msg "Applying patches..."
	local i patches
	for i in "${source[@]}"; do
		i=${i##*/}
		[[ $i =~ .*\.patch$ ]] && patches=("${patches[@]}" "$srcdir/$i")
		[[ ${i%.*} =~ .*\.patch$ ]] && patches=("${patches[@]}" "$srcdir/${i%.*}")
	done

	shopt -s nullglob
	for i in "${patches[@]}" "$startdir/patches/"*; do
		msg2 "Applying ${i##*/}..."
		patch -Np1 -i "$i" || (error "Applying ${i##*/} failed" && return 1)
	done
	shopt -u nullglob


	#################
	# CONFIGURATION
	#################

	#########################
	# Loading configuration
	#########################
	msg "Loading configuration..."
	for i in local "saved.$CARCH" "$CARCH"; do
		if [[ -e $startdir/config.$i ]]; then
			msg2 "Using kernel config file config.$i..."
			cp -f "$startdir/config.$i" .config
			break
		fi
	done

	[[ ! -e .config ]] &&
		warning "No suitable kernel config file was found. You'll have to configure the kernel from scratch."


	###########################
	# Start the configuration
	###########################
	msg "Updating configuration..."
	yes "" | make config > /dev/null

	if [[ -n ${_config_cmd// /} ]]; then
		msg2 "Running make $_config_cmd..."
		zcat /proc/config.gz > /home/steve/Desktop/config
		make $_config_cmd
	else
		warning "Unknown config command: $_config_cmd"
	fi


	##############################################
	# Save the config file the package directory
	##############################################
	if [[ -n $_save_config || -n $_configure_only ]]; then
		msg "Saving configuration..."
		msg2 "Saving $_kernel_src/.config as $startdir/config.saved.$CARCH"
		cp .config "$startdir/config.saved.$CARCH"
	fi


	#######################################
	# Stop after configuration if desired
	#######################################
	if [[ -n $_configure_only ]]; then
		rm -rf "$_kernel_src" "$srcdir" "$pkgdir"
		return 1
	fi


	if [[ -f /home/steve/Desktop/config ]]; then
		rm /home/steve/Desktop/config
	fi
	###############################
	# Append date to localversion
	###############################
	if [[ -n $_date_localversion ]]; then
		local _localversion="$(sed -rn 's/^CONFIG_LOCALVERSION="([^"]*)"$/\1/p' .config)"
		[[ -n $_localversion ]] && msg2 "CONFIG_LOCALVERSION is set to: $_localversion"

		# since this is a git package, the $pkgver is equal to $(date +%Y%m%d)
		msg2 "Appending $pkgver to CONFIG_LOCALVERSION..."
		sed -ri "s/^(CONFIG_LOCALVERSION=).*$/\1\"$_localversion-$pkgver\"/" .config
	fi


	####################################
	# Append pkgrel to kernel version
	####################################
	[[ -z $_gitname || -z $_gitroot ]] &&
		sed -ri "s/^(EXTRAVERSION =).*$/\1 -$pkgrel/" Makefile


	####################################
	# don't run depmod on 'make install'
	####################################
	sed -i '2iexit 0' scripts/depmod.sh
	git update-index --assume-unchanged scripts/depmod.sh


	#################
	# BUILD PROCESS
	#################

	################################
	# Build the kernel and modules
	################################
	msg "Building kernel and modules..."
	make $MAKEFLAGS V="$_verbose" bzImage modules


	###################################
	# Copy files from build directory
	####################################
	if [[ $_build_dir != $srcdir ]]; then
		msg "Saving $_kernel_src to $srcdir/${_kernel_src##*/}..."
		mv "$_kernel_src" "$srcdir"
		rm -rf "$_kernel_src"
	fi
}


_generic_package_initialization() {
	cd "$srcdir/${_kernel_src##*/}"

	_karch="x86"

	######################
	# Get kernel version
	######################
	_kernver=$(make kernelrelease)
	_basekernver=${_kernver%%-*}


	############################################################
	# Use kernel version instead of the current date as pkgver
	############################################################
	if [[ -n $_kernel_pkgver ]]; then
		pkgver=${_kernver//-/_}
		msg "Setting pkgver to kernel version: $pkgver"
	fi
}

_generic_package_linux() {
	pkgdesc="The Linux Kernel and modules from Linus' git tree"
	backup=(etc/mkinitcpio.d/$pkgname.preset)
	install=$pkgname.install
	changelog=$pkgname.changelog

	# set required variables
	_generic_package_initialization


	#############################################################
	# Provide linux
	# (probably someone wants to use this kernel exclusively?)
	#############################################################
	provides=("${provides[@]}" "linux=${_kernver//-/_}")


	################
	# INSTALLATION
	################

	#####################
	# Install the image
	#####################
	msg "Installing kernel image..."
	install -Dm644 arch/$_karch/boot/bzImage "$pkgdir/boot/vmlinuz-$pkgname"


	##########################
	# Install kernel modules
	##########################
	msg "Installing kernel modules..."
	# force -j1 to work around make 3.82 bug
	make -j1 INSTALL_MOD_PATH="$pkgdir/usr" modules_install
	[[ -z $_no_modules_compression ]] && find "$pkgdir" -name "*.ko" -exec gzip -9 {} +

	#########################################################
	# Set up extramodules directory (for external modules)
	#########################################################
	local extramodules="$pkgdir/usr/lib/modules/extramodules-$(cut -d. -f1,2 <<<$_basekernver)"
	local modversion=$(grep '^CONFIG_LOCALVERSION=' .config | cut -d'"' -f2)
	[[ -n $modversion ]] && extramodules+=$modversion
	install -dm755 "${extramodules}${_pkgext}"
	echo $_kernver > "${extramodules}${_pkgext}/version"
	ln -s "../${extramodules##*/}${_pkgext}" "$pkgdir/usr/lib/modules/$_kernver/extramodules"


	##################################
	# Create important symlinks
	##################################
	msg "Creating important symlinks..."

	# Create generic modules symlink
	if [[ $_kernver != ${_basekernver}${_pkgext} ]]; then
		cd "$pkgdir/usr/lib/modules"
		ln -s "$_kernver" "${_basekernver}${_pkgext}"
		cd "$OLDPWD"
	fi

	# remove header symlinks
	cd "$pkgdir/usr/lib/modules/$_kernver"
		rm -rf source build
		cd "$OLDPWD"


	############################
	# Install mkinitcpio files
	############################
	install -d "$pkgdir/etc/mkinitcpio.d"

	msg "Generating $pkgname.preset..."
	cat > "$pkgdir/etc/mkinitcpio.d/$pkgname.preset" <<EOF
# mkinitcpio preset file for the '$pkgname' package

ALL_config="/etc/mkinitcpio.conf"
ALL_kver="/boot/vmlinuz-$pkgname"

PRESETS=('default')

#default_config="/etc/mkinitcpio.conf"
default_image="/boot/initramfs-$pkgname.img"
#default_options=""
EOF


	#######################
	# Update install file
	#######################
	msg "Updating install file..."
	sed -ri "s/^(pkgname=).*$/\1$pkgname/" "$startdir/$pkgname.install"
	sed -ri "s/^(kernver=).*$/\1$_kernver/" "$startdir/$pkgname.install"


	#######################
	# Remove the firmware
	#######################
	rm -rf "$pkgdir/usr/lib/firmware"


	#######################
	# Run depmod
	#######################
	depmod -b "$pkgdir/usr" -F System.map "$_kernver"
}



_generic_package_linux-headers() {
	pkgdesc="Header files and scripts for building modules for $pkgbase"
	depends=("$pkgbase")

	# set required variables
	_generic_package_initialization

	#############################################################
	# Provide linux-headers
	# (probably someone wants to use this kernel exclusively?)
	#############################################################
	provides=("${provides[@]}" "linux-headers=${_kernver//-/_}")


	##############################
	# Install fake kernel source
	##############################
	install -Dm644 Module.symvers  "$pkgdir/usr/src/linux-$_kernver/Module.symvers"
	install -Dm644 Makefile        "$pkgdir/usr/src/linux-$_kernver/Makefile"
	install -Dm644 kernel/Makefile "$pkgdir/usr/src/linux-$_kernver/kernel/Makefile"
	install -Dm644 .config         "$pkgdir/usr/src/linux-$_kernver/.config"
	install -Dm644 .config         "$pkgdir/usr/lib/modules/$_kernver/.config"


	#######################################################
	# Install scripts directory and fix permissions on it
	#######################################################
	cp -a scripts "$pkgdir/usr/src/linux-$_kernver"


	##########################
	# Install header files
	##########################
	msg "Installing header files..."

	for i in net/ipv4/netfilter/ipt_CLUSTERIP.c \
		$(find include/ net/mac80211/ drivers/{md,media/video/} -iname "*.h") \
		$(find include/config/ -type f) \
		$(find . -name "Kconfig*")
	do
		mkdir -p "$pkgdir/usr/src/linux-$_kernver/${i%/*}"
		cp -af "$i" "$pkgdir/usr/src/linux-$_kernver/$i"
	done

	# required by virtualbox and probably others
	ln -s "../generated/autoconf.h" "$pkgdir/usr/src/linux-$_kernver/include/linux/"


	########################################
	# Install architecture dependent files
	########################################
	msg "Installing architecture files..."
	mkdir -p "$pkgdir/usr/src/linux-$_kernver/arch/$_karch/kernel"
	cp -a arch/$_karch/kernel/asm-offsets.s "$pkgdir/usr/src/linux-$_kernver/arch/$_karch/kernel/"

	cp -a arch/$_karch/Makefile* "$pkgdir/usr/src/linux-$_kernver/arch/$_karch/"
	cp -a arch/$_karch/configs "$pkgdir/usr/src/linux-$_kernver/arch/$_karch/"

	# copy arch includes for external modules and fix the nVidia issue
	mkdir -p "$pkgdir/usr/src/linux-$_kernver/arch/$_karch"
	cp -a "arch/$_karch/include" "$pkgdir/usr/src/linux-$_kernver/arch/$_karch/"

	# create a necessary symlink to the arch folder
	cd "$pkgdir/usr/src/linux-$_kernver/arch"

	if [[ $CARCH = "x86_64" ]]; then
		ln -s $_karch x86_64
	else
		ln -s $_karch i386
	fi

	cd "$OLDPWD"


	################################
	# Remove unneeded architecures
	################################
	msg "Removing unneeded architectures..."
	for i in "$pkgdir/usr/src/linux-$_kernver/arch/"*; do
		[[ ${i##*/} =~ ($_karch|Kconfig) ]] || rm -rf "$i"
	done


	############################
	# Remove .gitignore files
	############################
	msg "Removing .gitignore files from kernel source..."
	find "$pkgdir/usr/src/linux-$_kernver/" -name ".gitignore" -delete


	##################################
	# Create important symlinks
	##################################
	msg "Creating important symlinks..."

	# the build symlink needs to be relative
	cd "$pkgdir/usr/lib/modules/$_kernver"
		rm -rf source build
		ln -s "/usr/src/linux-$_kernver" build
		cd "$OLDPWD"

	if [[ $_kernver != ${_basekernver}${_pkgext} ]]; then
		cd "$pkgdir/usr/src"
		ln -s "linux-$_kernver" "linux-${_basekernver}${_pkgext}"
		cd "$OLDPWD"
	fi
}

_generic_package_linux-docs() {
	pkgdesc="Kernel hackers manual - HTML documentation that comes with the Linux kernel."
	depends=("$pkgbase")

	# set required variables
	_generic_package_initialization

	mkdir -p "$pkgdir/usr/src/linux-$_kernver"
	cp -aL Documentation "$pkgdir/usr/src/linux-$_kernver/"
}

# vim: set fenc=utf-8 ts=2 sw=2 noet: