# Copyright 2018 Redcore Linux Project
# Distributed under the terms of the GNU General Public License v2

SUMMARY="Redcore Linux Project LTS Kernel Image"
DESCRIPTION="Redcore Linux Project LTS Kernel Image"
HOMEPAGE="https://redcorelinux.org"

DOWNLOADS="https://cdn.kernel.org/pub/linux/kernel/v4.x/linux-${PV}.tar.xz"

LICENCES="GPL-2"
SLOT="${PV}"
PLATFORMS="~amd64"

EXTRAVERSION="redcore-lts"
KV_FULL=""${PV}"-"${EXTRAVERSION}""

MYOPTIONS="
    cryptsetup [[ description = [ Use sys-fs/cryptsetup to unlock LUKS encrypted partitions ] ]]
    dkms       [[ description = [ Use sys-kernel/dkms to build 3rd party dkms kernel modules ] ]]
    dracut     [[ description = [ Use sys-boot/dracut to create initramfs images ] ]]
    mdadm      [[ description = [ Use sys-fs/mdadm to create, manage, and monitor Linux MD (software RAID) devices ] ]]
"

DEPENDENCIES="
    build:
        app-arch/xz
        sys-apps/bc
        sys-devel/make
    build+run:
        cryptsetup? ( sys-fs/cryptsetup )
        dkms? (
            sys-kernel/dkms
            sys-kernel/linux-sources-redcore-lts:"${SLOT}"
        )
        dracut? ( sys-boot/dracut )
        mdadm? ( sys-fs/mdadm )
        firmware/linux-firmware
"

DEFAULT_SRC_PREPARE_PATCHES=(
    "${FILES}"/introduce-NUMA-identity-node-sched-domain.patch
    "${FILES}"/k10temp-add-ZEN-support.patch
    "${FILES}"/mute-pps_state_mismatch.patch
    "${FILES}"/restore-SD_PREFER_SIBLING-on-MC-domains.patch
    "${FILES}"/Revert-ath10k-activate-user-space-firmware-loading.patch
    "${FILES}"/linux-hardened.patch
    "${FILES}"/uksm-linux-hardened.patch
    "${FILES}"/0001-MuQSS-version-0.162-CPU-scheduler-linux-hardened.patch
    "${FILES}"/0002-Make-preemptible-kernel-default.patch
    "${FILES}"/0003-Expose-vmsplit-for-our-poor-32-bit-users.patch
    "${FILES}"/0004-Create-highres-timeout-variants-of-schedule_timeout-.patch
    "${FILES}"/0005-Special-case-calls-of-schedule_timeout-1-to-use-the-.patch
    "${FILES}"/0006-Convert-msleep-to-use-hrtimers-when-active.patch
    "${FILES}"/0007-Replace-all-schedule-timeout-1-with-schedule_min_hrt.patch
    "${FILES}"/0008-Replace-all-calls-to-schedule_timeout_interruptible-.patch
    "${FILES}"/0009-Replace-all-calls-to-schedule_timeout_uninterruptibl.patch
    "${FILES}"/0010-Don-t-use-hrtimer-overlay-when-pm_freezing-since-som.patch
    "${FILES}"/0011-Make-hrtimer-granularity-and-minimum-hrtimeout-confi.patch
    "${FILES}"/0012-Reinstate-default-Hz-of-100-in-combination-with-MuQS.patch
    "${FILES}"/0013-Make-threaded-IRQs-optionally-the-default-which-can-.patch
    "${FILES}"/0014-Swap-sucks.patch
    "${FILES}"/0015-MuQSS.c-needs-irq_regs.h-to-use-get_irq_regs.patch
    "${FILES}"/0016-unfuck-MuQSS-on-linux-4_14_15+.patch
    "${FILES}"/0001-BFQ-v8r12-20171108.patch
    "${FILES}"/0002-BFQ-v8r12-20180404.patch
    "${FILES}"/0001-pkg-config.patch
    "${FILES}"/0002-objtool-dont-hardcore-ar.patch
)

WORK="${WORKBASE}"/linux-"${PV}"

pkg_setup() {
    exdirectory --allow /boot

    export KBUILD_BUILD_USER="nexus"
    export KBUILD_BUILD_HOST="nexus.redcorelinux.org"

    export REAL_ARCH="$ARCH"
    unset ARCH ; unset LDFLAGS #will interfere with Makefile if set
}

src_prepare() {
    default

    src_prepare_params=(
        CC="${CC}"
        HOSTCC="${CC}"
    )

    edo emake \
        "${src_prepare_params[@]}" \
        mrproper

    edo sed -ri "s|^(EXTRAVERSION =).*|\1 -${EXTRAVERSION}|" Makefile
    edo cp "${FILES}"/"${EXTRAVERSION}"-amd64.config .config
    edo rm -rf $(find . -type f|grep -F \.orig)
}

src_compile() {
    src_compile_params=(
        AR="${AR}"
        AS="${AS}"
        CC="${CC}"
        HOSTCC="${CC}"
        HOSTLD="${LD}"
        LD="${LD}"
        NM="${NM}"
        OBJCOPY="${OBJCOPY}"
        OBJDUMP="${OBJDUMP}"
    )

    edo emake \
        "${src_compile_params[@]}" \
         prepare modules_prepare bzImage modules
}

src_install() {
    dodir /boot
    insinto /boot
    newins .config config-"${KV_FULL}"
    newins System.map System.map-"${KV_FULL}"
    newins arch/x86/boot/bzImage vmlinuz-"${KV_FULL}"

    dodir /usr/src/linux-"${KV_FULL}"
    insinto /usr/src/linux-"${KV_FULL}"
    doins Module.symvers
    doins System.map
    exeinto /usr/src/linux-"${KV_FULL}"
    doexe vmlinux

    src_install_params=(
        CC="${CC}"
        HOSTCC="${CC}"
    )

    edo emake \
        "${src_install_params[@]}" \
        INSTALL_MOD_PATH="${IMAGE}"usr/"$(exhost --target)" modules_install

    edo rm -f "${IMAGE}"usr/"$(exhost --target)"/lib/modules/"${KV_FULL}"/build
    edo rm -f "${IMAGE}"usr/"$(exhost --target)"/lib/modules/"${KV_FULL}"/source
    export local KSYMS
    for KSYMS in build source ; do
        dosym ../../../../../usr/src/linux-"${KV_FULL}" usr/"$(exhost --target)"/lib/modules/"${KV_FULL}"/"${KSYMS}"
    done
}

_grub2_update_grubcfg() {
    if [ -x $(which grub-mkconfig) ]; then
        grub-mkconfig -o "${ROOT}"boot/grub/grub.cfg
    fi
}

_dracut_initrd_create() {
    if [ -x $(which dracut) ]; then
        dracut -N -f --kver="${KV_FULL}" "${ROOT}"boot/initrd-"${KV_FULL}"
    fi
}

_dracut_initrd_delete() {
    rm -rf "${ROOT}"boot/initrd-"${KV_FULL}"
}

_dkms_modules_delete() {
    if [ -x $(which dkms) ] ; then
        export local DKMSMOD
        for DKMSMOD in $(dkms status | cut -d " " -f1,2 | sed -e 's/,//g' | sed -e 's/ /\//g' | sed -e 's/://g') ; do
            dkms remove "${DKMSMOD}" -k "${KV_FULL}"
        done
    fi
}

_kernel_modules_delete() {
    rm -rf "${ROOT}"usr/"$(exhost --target)"/lib/modules/"${KV_FULL}"
}

pkg_postinst() {
    if [ $(stat -c %d:%i /) == $(stat -c %d:%i /proc/1/root/.) ]; then
        if option dracut; then
            _dracut_initrd_create
        fi

        _grub2_update_grubcfg
    fi
}

pkg_postrm() {
    if [ $(stat -c %d:%i /) == $(stat -c %d:%i /proc/1/root/.) ]; then
        if option dracut; then
            _dracut_initrd_delete
        fi

        if use dkms; then
            _dkms_modules_delete
        fi

        _kernel_modules_delete
        _grub2_update_grubcfg
    fi
}