# Contributor: Carlo Landmeter <clandmeter@gmail.com>
# Maintainer: Timo Teräs <timo.teras@iki.fi>
pkgname=grub
pkgver=2.02
pkgrel=15
pkgdesc="Bootloader with support for Linux, Multiboot and more"
url="https://www.gnu.org/software/grub/"
arch="all !s390x"
license="GPL-3.0-or-later"
depends="mkinitfs"
triggers="grub.trigger=/boot"
depends_dev=""
makedepends="$depends_dev bison flex linux-headers xz-dev lvm2-dev
	automake autoconf libtool python3 freetype-dev unifont"
install="$pkgname.post-upgrade"
# strip handled by grub Makefiles, abuild strip breaks xen pv-grub
options="!check !strip"  # Cannot test boot loader.
subpackages="$pkgname-dev $pkgname-doc"

# currently grub only builds on x86*, aarch64 and ppc* systems
flavors=""
case "$CARCH" in
x86)		flavors="efi bios";;
x86_64)		flavors="efi bios xenhost xenhost_pvh";;
aarch64|arm*)	flavors="efi";;
mips*)		flavors="qemu_mips";;
ppc*)		flavors="ieee1275"; makedepends="$makedepends powerpc-utils" ;;
s390x)		flavors="emu" ;;
esac
for f in $flavors; do
	[ x"$f" = x"xenhost_pvh" ] && continue # xenhost_pvh shipped in the xenhost subpackage
	subpackages="$subpackages $pkgname-$f"
done

source="https://ftp.gnu.org/gnu/grub/grub-$pkgver.tar.xz
	fix-gcc-no-pie-specs.patch
	grub2-accept-empty-module.patch
	grub-xen-host_grub.cfg
	2.02_beta3-mkconfig-alpine.patch
	0008-Fix-packed-not-aligned-error-on-GCC-8.patch
	0009-xfs-Accept-filesystem-with-sparse-inodes.patch
	x86-64-Treat-R_X86_64_PLT32-as-R_X86_64_PC32.patch
	alpine-use-uuid.patch
	f2fs-support.patch

	0001-xen-Add-some-Xen-headers.patch
	0002-loader-linux-Support-passing-RSDP-address-via-boot-p.patch
	0003-xen-Carve-out-grant-tab-initialization-into-dedicate.patch
	0004-xen-Prepare-common-code-for-Xen-PVH-support.patch
	0005-xen-Add-some-dummy-headers-for-PVH-mode.patch
	0006-xen-Rearrange-xen-init.c-to-prepare-it-for-Xen-PVH-m.patch
	0007-xen-Modify-grub_xen_ptr2mfn-for-Xen-PVH.patch
	0008-xen-Add-PVH-specific-defines-to-offset.h.patch
	0009-xen-Add-basic-hooks-for-PVH-in-current-code.patch
	0010-xen-Add-PVH-boot-entry-code.patch
	0011-xen-Setup-hypercall-page-for-PVH.patch
	0012-xen-Get-memory-map-from-hypervisor-for-PVH.patch
	0013-xen-Setup-Xen-specific-data-for-PVH.patch
	0014-xen-Init-memory-regions-for-PVH.patch
	0015-xen_pvh-Add-build-runes-for-grub-core.patch
	0016-grub-module-verifier-Ignore-all_video-for-xen_pvh.patch
	0017-xen-Use-elfnote-defines-instead-of-plain-numbers.patch
	0018-xen_pvh-Support-building-a-standalone-image.patch
	0019-xen_pvh-Support-grub-install-for-xen_pvh.patch
	0020-xen_pvh-Add-support-to-configure.patch
	"
builddir="$srcdir/grub-$pkgver"

prepare() {
	default_prepare
	PYTHON=python3 ./autogen.sh
}

_build_flavor() {
	local flavor="$1"
	shift
	local _configure="$@"

	msg "Building grub for platform $flavor"
	mkdir -p "$srcdir"/build-$flavor
	cd "$srcdir"/build-$flavor
	$builddir/configure \
		--build=$CBUILD \
		--host=$CHOST \
		--target=$CTARGET \
		--prefix=/usr \
		--sysconfdir=/etc \
		--mandir=/usr/share/man \
		--localstatedir=/var \
		--disable-nls \
		--disable-werror \
		$_configure
	make
}

build() {
	local f
	for f in $flavors; do
		case "$f" in
		bios)		_build_flavor $f --with-platform=pc;;
		efi)		_build_flavor $f --with-platform=efi --disable-efiemu;;
		xenhost)	_build_flavor $f --with-platform=xen;;
		xenhost_pvh)	_build_flavor $f --with-platform=xen_pvh --target=i386;;
		*)		_build_flavor $f --with-platform=$f;;

		esac
	done
}

_install_xen() {
	grub_dir=`mktemp -d`
	cfg=`mktemp`
	grub_memdisk=`mktemp`

	mkdir -p $grub_dir/boot/grub
	echo 'normal (memdisk)/grub.cfg' > $cfg
	sed -e "s/@@PVBOOT_ARCH@@/$CARCH/g" \
		$srcdir/grub-xen-host_grub.cfg \
			> $grub_dir/grub.cfg
	tar -cf - -C $grub_dir grub.cfg > $grub_memdisk

	./grub-mkimage \
		-O $CARCH-xen \
		-c $cfg \
		-d ./grub-core ./grub-core/*.mod \
		-m $grub_memdisk \
		-o $pkgdir/grub-$CARCH-xen.bin

	rm -r "$grub_dir"
	rm "$cfg" "$grub_memdisk"
}

_install_xenpvh() {
	grub_dir=`mktemp -d`
	cfg=`mktemp`
	grub_memdisk=`mktemp`

	mkdir -p $grub_dir/boot/grub
	echo 'normal (memdisk)/grub.cfg' > $cfg
	sed -e "s/@@PVBOOT_ARCH@@/$CARCH/g" \
		$srcdir/grub-xen-host_grub.cfg \
			> $grub_dir/grub.cfg
	tar -cf - -C $grub_dir grub.cfg > $grub_memdisk

	echo "About to run grub-mkimage in: $PWD"
	# Note: only i386-xen_pvh supported
	./grub-mkimage \
		-O i386-xen_pvh \
		-c $cfg \
		-d ./grub-core ./grub-core/*.mod \
		-m $grub_memdisk \
		-o $pkgdir/grub-i386-xen_pvh.bin

	rm -r "$grub_dir"
	rm "$cfg" "$grub_memdisk"
}

_install_flavor() {
	local flavor="$1"
	cd "$srcdir"/build-$flavor
	case $flavor in
	xenhost)	_install_xen;;
	xenhost_pvh)	_install_xenpvh;;
	*)	 	make DESTDIR="$pkgdir" install-strip;;
	esac
}

package() {
	# install BIOS & EFI version into the same directory
	# and overwrite similar files.
	for f in $flavors; do
		_install_flavor $f
	done

	rm -f "$pkgdir"/usr/lib/charset.alias
	# remove grub-install warning of missing directory
	mkdir -p "$pkgdir"/usr/share/locale

	mkdir -p "$pkgdir"/etc/default/
	cat >"$pkgdir"/etc/default/grub <<-EOF
	GRUB_DISTRIBUTOR="Alpine"
	GRUB_TIMEOUT=2
	GRUB_DISABLE_SUBMENU=y
	GRUB_DISABLE_RECOVERY=true
	EOF
}

bios() {
	pkgdesc="$pkgdesc (BIOS version)"
	depends="$pkgname"
	mkdir -p $subpkgdir/usr/lib/grub
	mv $pkgdir/usr/lib/grub/*-pc $subpkgdir/usr/lib/grub/
}

efi() {
	pkgdesc="$pkgdesc (EFI version)"
	depends="$pkgname"
	mkdir -p $subpkgdir/usr/lib/grub
	mv $pkgdir/usr/lib/grub/*-efi $subpkgdir/usr/lib/grub/
}

xenhost() {
	pkgdesc="$pkgdesc (XEN host version)"
	mkdir -p $subpkgdir/usr/lib/grub-xen
	mv $pkgdir/*-xen.bin $subpkgdir/usr/lib/grub-xen/

	# pick up result from xenhost_pvh build as well
	mv $pkgdir/*-xen_pvh.bin $subpkgdir/usr/lib/grub-xen/
}

qemu_mips() {
	pkgdesc="$pkgdesc (QEMU MIPS version)"
	depends="$pkgname"
	mkdir -p $subpkgdir/usr/lib/grub
	mv $pkgdir/usr/lib/grub/*-qemu_mips $subpkgdir/usr/lib/grub/
}

ieee1275() {
	pkgdesc="$pkgdesc (IEEE1275 version)"
	depends="$pkgname powerpc-utils"
	mkdir -p $subpkgdir/usr/lib/grub
	mv $pkgdir/usr/lib/grub/*-ieee1275 $subpkgdir/usr/lib/grub/
}

emu() {
	pkgdesc="$pkgdesc (EMU version)"
	depends="$pkgname"
	mkdir -p $subpkgdir/usr/lib/grub
	mv $pkgdir/usr/lib/grub/*-emu $subpkgdir/usr/lib/grub/
}

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