pkgname=kernel-scripts
pkgver=4.15.0
pkgrel=2
pkgdesc="Binary scripts needed to build kernel packages"
url="http://kernel.org"
depends=""
makedepends="perl gmp-dev elfutils-dev bash sed bc linux-headers file openssl-dev"
options="!check"
arch="x86_64 armhf aarch64"
license="GPL-2.0"

# Sources
case $pkgver in
	*.*.*)	_kernver=${pkgver%.*};;
	*.*) _kernver=$pkgver;;
esac
source="https://cdn.kernel.org/pub/linux/kernel/v${pkgver%%.*}.x/linux-$_kernver.tar.xz"
if [ "${pkgver%.0}" = "$pkgver" ]; then
	source="$source
	https://cdn.kernel.org/pub/linux/kernel/v${pkgver%%.*}.x/patch-$pkgver.xz"
fi

# Arch
_carch=${CARCH}
case "$_carch" in
aarch64*) _carch="arm64" ;;
arm*) _carch="arm" ;;
mips*) _carch="mips" ;;
ppc*) _carch="powerpc" ;;
s390*) _carch="s390" ;;
esac

builddir="$srcdir/linux-$_kernver"
prepare() {
	cd "$builddir"

	# Apply patch
	local patch="$srcdir/patch-$pkgver.xz"
	if [ -e "$patch" ]; then
		msg "Applying patch-$pkgver.xz"
		unxz -c < "$srcdir"/patch-$pkgver.xz | patch -p1 -N
	fi
}

build() {
	unset LDFLAGS
	mkdir -p "$srcdir/build"
	make -j1 -C "$builddir" O="$srcdir/build" ARCH="$_carch" \
		HOSTCC="${CC:-gcc}" defconfig scripts
}

package() {
	local type_bin="application/x-pie-executable"
	msg "Finding and installing $type_bin files..."

	local i
	local found=false
	cd "$srcdir/build/scripts"
	for i in $(find . -type f); do
		local type="$(file -b --mime-type "$i")"
		if [ "$type" != "$type_bin" ]; then
			echo "$i: different mime-type ($type)"
			continue
		fi
		echo "$i: matched!"
		install -Dm755 "$i" "$pkgdir/usr/bin/kernel-scripts/$i"
		found=true
	done
	if [ "$found" = "false" ]; then
		error "Could not find any binaries! 'file' probably prints out a"
		error "different mime-type now. This is easy to fix, just figure out"
		error "the correct one from the output above (look at the"
		error "./basic/fixdep line for example) then adjust type_bin= in"
		error "package()."
		return 1
	fi
}
sha512sums="c00d92659df815a53dcac7dde145b742b1f20867d380c07cb09ddb3295d6ff10f8931b21ef0b09d7156923a3957b39d74d87c883300173b2e20690d2b4ec35ea  linux-4.15.tar.xz"