# Based on linux-lg-mako. Changes:
# - add findutils makedepend (necessary for the initramfs)
# - it builds an initramfs - do not use ramdisk.cpio and
#	ramdisk-recovery.cpio, in there, always use the
#	initramfs from the kernel2 partition ("isorec")
# - directly boot to that initramfs, not only when the recovery
#	key combination was pressed.
# - use Alpine's busybox-static instead of the pre-compiled
#	binary, that comes with the source
# - reduce lzo compression because Alpine's busybox doesn't
#	support high compression
#
# Kernel config changes, based on: arch/arm/configs/janice_defconfig
# - enable devtmpfs (needed for udev -> touch support in weston)

# This must be built in the target chroot, so busybox.static can
# be used.
_pmb_build_in_native_chroot="false"

_vendor=samsung
_flavor=samsung-i9070
_hash="ac7219c4b8dcec7bc5a598d42c6be0db4aa36332"
_config="config-${_flavor}.armhf"

pkgname=linux-${_flavor}
pkgver=3.0.101
case $pkgver in
	*.*.*)  _kernver=${pkgver%.*};;
	*.*) _kernver=$pkgver;;
esac
pkgrel=1
arch="armhf"
pkgdesc="Samsung Galaxy S Advance kernel from Epirex"
url="https://github.com/Epirex/Samsung_STE_Kernel"
depends="postmarketos-mkinitfs"
makedepends="perl sed installkernel bash gmp-dev bc linux-headers elfutils-dev
findutils busybox-static"
options="!strip !check !tracedeps"
install=
source="
	$pkgname-$_hash.zip::https://github.com/Epirex/Samsung_STE_Kernel/archive/${_hash}.zip
	$_config
	compiler-gcc6.h
	fix_return_address.patch
	init
"
subpackages=""
license="GPL2"

_abi_release=${pkgver}
_carch="arm"
HOSTCC="${CC:-gcc}"
HOSTCC="${HOSTCC#${CROSS_COMPILE}}"

ksrcdir="$srcdir/Samsung_STE_Kernel-${_hash}"

prepare() {
	local _patch_failed=
	cd "$ksrcdir"

	# first apply patches in specified order
	for i in $source; do
		case $i in
		*.patch)
			msg "Applying $i..."
			if ! patch -s -p1 -N -i "$srcdir"/$i; then
				echo $i >>failed
				_patch_failed=1
			fi
			;;
		esac
	done

	if ! [ -z "$_patch_failed" ]; then
		error "The following patches failed:"
		cat failed
		return 1
	fi

	# Use Alpine's busybox.static instead of the pre-compiled busybox shipped
	# with the source
	cp -v /bin/busybox.static "$ksrcdir"/usr/u8500_initramfs_files/busybox

	# do not use ramdisk.cpio and ramdisk-recovery.cpio, always use
	# the initramfs from the kernel2 partition ("isorec"), so we can build
	# it later and independently from the kernel. also directly boot that
	# partition, not only when the recovery key combination was used.
	cd "$ksrcdir"/usr/
	mv u8500_initramfs.list u8500_initramfs.list_old
	grep -v "../../ramdisk" u8500_initramfs.list_old > u8500_initramfs.list \
		|| return 1
	cp -v "$srcdir"/init "$ksrcdir"/usr/u8500_initramfs_files/init || return 1

	# Reduce lzo compression because Alpine's busybox doesn't support high 
	# compression
	sed -i -e 's/lzop -9/lzop -6/g' "$ksrcdir"/scripts/Makefile.lib || return 1
	sed -i -e 's/lzop -9/lzop -6/g' "$ksrcdir"/scripts/gen_initramfs_list.sh || return 1

	# gcc6 support
	cp -v "$srcdir/compiler-gcc6.h" "$ksrcdir/include/linux/" || return 1

	mkdir -p "$srcdir"/build
	cp "$srcdir"/$_config "$srcdir"/build/.config || return 1
	make -C "$ksrcdir" O="$srcdir"/build ARCH="$_carch" HOSTCC="$HOSTCC" \
		silentoldconfig
}



# this is so we can do: 'abuild menuconfig' to reconfigure kernel
menuconfig() {
	cd "$srcdir"/build || return 1
	make ARCH="$_carch" menuconfig
	cp .config "$startdir"/$_config
}

build() {
	cd "$srcdir"/build
	unset LDFLAGS

	make ARCH="$_carch" CC="${CC:-gcc}" \
		KBUILD_BUILD_VERSION="$((pkgrel + 1 ))-Alpine" \
		|| return 1
}

package() {
	install -Dm644 "$srcdir/build/arch/arm/boot/zImage" \
		"$pkgdir/boot/vmlinuz-$_flavor"

	install -D "$srcdir/build/include/config/kernel.release" \
		"$pkgdir/usr/share/kernel/$_flavor/kernel.release"
}

sha512sums="ea4e0f56efadd12c3dab18f15214973c708f777097aecac2fb7be4118472ba6e61e2660579eec7a2b57398c3a78107c965b59a108ddf1178d481a4e353a68077  linux-samsung-i9070-ac7219c4b8dcec7bc5a598d42c6be0db4aa36332.zip
8789a6b50cb4f438aa581003a54419d70e36f7077bb0107aeaaa237bb2d603d9fc67a25e47460068547c1dcc296c64752b3b448629bd4b64645e619d314ab9bf  config-samsung-i9070.armhf
d80980e9474c82ba0ef1a6903b434d8bd1b092c40367ba543e72d2c119301c8b2d05265740e4104ca1ac5d15f6c4aa49e8776cb44264a9a28dc551e0d1850dcc  compiler-gcc6.h
ea1d3b5a234fa565e3c1a792de48f4fc4e6023d281d303c8e319c7ef28edc5739ab0e4dea0139a41f0a5c7d03e27921ccaa214fd0ac5c72245a094ce60128864  fix_return_address.patch
ef01c51c138239a49c1d00ae0074a07fed267d64934cf3d436a8ff057b91692ee2d040a45eacbb0dc62d5017a708c4dca2fadc282c850fa72aeebcfa787e2cbc  init"