# Copyright 2007 Bryan Østergaard <bryan.ostergaard@gmail.com>
# Copyright 2018 Redcore Linux Project
# Distributed under the terms of the GNU General Public License v2

require gnu [ suffix=tar.xz ] \
    flag-o-matic \
    autotools [ supported_autoconf=[ 2.5 ] supported_automake=[ 1.16 1.15 ] ]

export_exlib_phases pkg_setup src_prepare src_configure src_compile src_install

SUMMARY="GRUB (Grand Unified Boot) bootloader"

LICENCES="GPL-3"
MYOPTIONS="
    device-mapper [[ description = [ Ability to detect and use device-mapper devices ] ]]
    efi           [[ description = [ Build EFI platform support ] ]]
    grub-mount    [[ description = [ FUSE driver for filesystems that GRUB understands ] ]]
    mkfont        [[ description = [ Build grub-mkfont which can create GRUB font files ] ]]
    pc            [[ description = [ Build PC platform support ] ]]
    themes        [[ description = [ Build and install GRUB themes (starfield) ] ]]
    ( providers: eudev systemd ) [[ number-selected = exactly-one ]]
    ( efi pc ) [[ number-selected = at-least-one ]]
"

# TODO: needs qemu-system-i386
RESTRICT="test"

DEPENDENCIES="
    build:
        sys-apps/help2man [[ note = [ man pages won't get created otherwise resulting in empty man dirs ] ]]
        sys-devel/bison
        sys-devel/flex[>=2.5.35]
        sys-devel/make
        device-mapper? ( sys-fs/lvm2 )
        grub-mount? ( sys-fs/fuse:0 )
        mkfont? (
            fonts/unifont
            media-libs/freetype:2
        )
        themes? ( fonts/dejavu )
    build+run:
        app-arch/xz
        sys-devel/gettext [[ note = [ required for grub-mkconfig, grep gettext in /etc/grub.d ] ]]
        !sys-boot/grub-static [[ description = [ /sbin/grub-install collides ] resolution = manual ]]
        providers:eudev? ( sys-apps/eudev )
        providers:systemd? ( sys-apps/systemd )
    run:
        efi? ( sys-boot/efibootmgr )
        sys-boot/grub-config-redcore
    suggestion:
        sys-boot/os-prober [[
            description = [ Ability to add other OSs automatically to grub.cfg via grub-mkconf ]
        ]]
"

AT_M4DIR=( m4 )

grub_pkg_setup() {
    # grub2 should be compiled with -Os, other optimizations may result in oversized core images
    replace-flags -O* -Os
    # retpoline flag is incompatible with the -mcmodel=large flag used by grub
    filter-flags -mindirect-branch=thunk
}

grub_src_prepare() {
    edo sed \
        -e "s/.*Running autoreconf.*/exit 0/" \
        -i autogen.sh

    edo ./autogen.sh

    autotools_src_prepare

    if option mkfont; then
        edo cp -ax "${ROOT}"usr/share/fonts/X11/unifont/unifont.pcf.gz unifont.pcf.gz
        edo gzip -d unifont.pcf.gz
    fi

    if option themes; then
        edo cp -ax "${ROOT}"usr/share/fonts/X11/dejavu/DejaVuSans.ttf DejaVuSans.ttf
    fi
}


grub_src_multibuild_prepare() {
    if option efi; then
        edo cp -ax "${WORK}" "${WORK}"-efi
    fi

    if option pc; then
        edo cp -ax "${WORK}" "${WORK}"-pc
    fi
}


grub_src_configure() {
    filter-flags -mfloat-abi=hard
    unset CFLAGS CPPFLAGS LDFLAGS

    grub_src_multibuild_prepare

    if option efi; then
        edo pushd "${WORK}"-efi

        myconf=(
            "CPP=${CC} -E"
            BUILD_CC=$(exhost --build)-cc
            BUILD_CFLAGS="$(print-build-flags CFLAGS)"
            BUILD_CPPFLAGS="$(print-build-flags CPPFLAGS)"
            BUILD_LDFLAGS="$(print-build-flags LDFLAGS)"
            --with-bootdir=/boot
            --with-grubdir=grub
            --with-platform=efi
            --enable-cache-stats
            --disable-libzfs
            --disable-werror
            # TODO: for now disable emulation utils
            --disable-efiemu
            --disable-grub-emu-sdl
            --disable-grub-emu-pci
            --disable-mm-debug
            gt_cv_func_gnugettext{1,2}_libc=yes
        )

        econf "${myconf[@]}" \
            $(option_enable device-mapper) \
            $(option_enable grub-mount) \
            $(option_enable mkfont grub-mkfont) \
            $(option_enable themes grub-themes)
    fi

    if option pc; then
        edo pushd "${WORK}"-pc

        myconf=(
            "CPP=${CC} -E"
            BUILD_CC=$(exhost --build)-cc
            BUILD_CFLAGS="$(print-build-flags CFLAGS)"
            BUILD_CPPFLAGS="$(print-build-flags CPPFLAGS)"
            BUILD_LDFLAGS="$(print-build-flags LDFLAGS)"
            --with-bootdir=/boot
            --with-grubdir=grub
            --with-platform=pc
            --enable-cache-stats
            --disable-libzfs
            --disable-werror
            # TODO: for now disable emulation utils
            --disable-efiemu
            --disable-grub-emu-sdl
            --disable-grub-emu-pci
            --disable-mm-debug
            gt_cv_func_gnugettext{1,2}_libc=yes
        )

        econf "${myconf[@]}" \
            $(option_enable device-mapper) \
            $(option_enable grub-mount) \
            $(option_enable mkfont grub-mkfont) \
            $(option_enable themes grub-themes)
    fi
}

grub_src_compile() {
    if option efi; then
        edo pushd "${WORK}"-efi
        emake
    fi

    if option pc; then
        edo pushd "${WORK}"-pc
        emake
    fi
}

grub_src_install() {
    if option efi; then
        edo pushd "${WORK}"-efi
        emake DESTDIR="${IMAGE}" install
        edo rm -rf "${WORK}"-efi
    fi

    if option pc; then
        edo pushd "${WORK}"-pc
        emake DESTDIR="${IMAGE}" install
        edo rm -rf "${WORK}"-pc
    fi

    dodoc "${WORK}"/docs/grub.cfg

    edo rm -f "${IMAGE}"/usr/$(exhost --target)/lib/charset.alias

    edo rm "${IMAGE%/}"/etc/bash_completion.d/${PN}
    edo rmdir "${IMAGE%/}"/etc/bash_completion.d/
}