#!/bin/bash

if ! [[ $KERNEL_INSTALL_MACHINE_ID ]]; then
    exit 0
fi

[[ -f /etc/sysconfig/kernel ]] && . /etc/sysconfig/kernel

COMMAND="$1"
KERNEL_VERSION="$2"
BOOT_DIR_ABS="$3"
KERNEL_IMAGE="$4"

KERNEL_DIR="${KERNEL_IMAGE%/*}"

MACHINE_ID=$KERNEL_INSTALL_MACHINE_ID

BLS_DIR="/boot/loader/entries"
ZIPLCFG="/etc/zipl.conf"
CMDLINE_LINUX_DEBUG=" systemd.log_level=debug systemd.log_target=kmsg"
LINUX_DEBUG_VERSION_POSTFIX="_with_debugging"
LINUX_DEBUG_TITLE_POSTFIX=" with debugging"

mkbls() {
    local kernelver=$1 && shift
    local datetime=$1 && shift
    local kernelopts=$1 && shift

    local debugname=""
    local flavor=""

    if [[ "$kernelver" == *\+* ]] ; then
        local flavor=-"${kernelver##*+}"
        if [[ "${flavor}" == "-debug" ]]; then
            local debugname=" with debugging"
	    local debugid="-debug"
        fi
    fi

    cat <<EOF
title ${NAME} (${kernelver}) ${VERSION}${debugname}
version ${kernelver}${debugid}
linux /boot/vmlinuz-${kernelver}
initrd /boot/initramfs-${kernelver}.img
options ${kernelopts}
id ${ID}-${datetime}-${kernelver}${debugid}
grub_users \$grub_users
grub_arg --unrestricted
grub_class kernel${flavor}
EOF
}

[[ "$KERNEL_VERSION" == *\+* ]] && flavor=-"${KERNEL_VERSION##*+}"
case "$COMMAND" in
    add)
        if [[ "${KERNEL_DIR}" != "/boot" ]]; then
            for i in \
                "$KERNEL_IMAGE" \
                    "$KERNEL_DIR"/System.map \
                    "$KERNEL_DIR"/config \
                    "$KERNEL_DIR"/zImage.stub
            do
                [[ -e "$i" ]] || continue
                cp -aT "$i" "/boot/${i##*/}-${KERNEL_VERSION}"
                command -v restorecon &>/dev/null && \
                    restorecon -R "/boot/${i##*/}-${KERNEL_VERSION}"
            done
            # hmac is .vmlinuz-<version>.hmac so needs a special treatment
            i="$KERNEL_DIR/.${KERNEL_IMAGE##*/}.hmac"
            if [[ -e "$i" ]]; then
                cp -a "$i" "/boot/.${KERNEL_IMAGE##*/}-${KERNEL_VERSION}.hmac"
                command -v restorecon &>/dev/null && \
                    restorecon "/boot/.${KERNEL_IMAGE##*/}-${KERNEL_VERSION}.hmac"
            fi
        fi

        if [[ ! -f /sbin/new-kernel-pkg || -d "$BLS_DIR" ]]; then
            declare -a BOOT_OPTIONS
            if [[ -f /etc/kernel/cmdline ]]; then
                read -r -d '' -a BOOT_OPTIONS < /etc/kernel/cmdline
            fi

            if ! [[ ${BOOT_OPTIONS[*]} ]]; then
                read -r -d '' -a line < /proc/cmdline
                for i in "${line[@]}"; do
                    [[ "${i#initrd=*}" != "$i" ]] && continue
                    BOOT_OPTIONS+=("$i")
                done
            fi

            if ! [[ ${BOOT_OPTIONS[*]} ]]; then
                echo "Could not determine the kernel command line parameters." >&2
                echo "Please specify the kernel command line in /etc/kernel/cmdline!" >&2
                exit 1
            fi

            [[ -d "$BLS_DIR" ]] || mkdir -m 0700 -p "$BLS_DIR"
            BLS_TARGET="${BLS_DIR}/${MACHINE_ID}-${KERNEL_VERSION}.conf"
            if [[ -f "${KERNEL_DIR}/bls.conf" ]]; then
                cp -aT "${KERNEL_DIR}/bls.conf" "${BLS_TARGET}" || exit $?
                sed -i -e "s,^linux.*,linux /boot/vmlinuz-${KERNEL_VERSION},g" "${BLS_TARGET}"
                sed -i -e "s,^initrd.*,initrd /boot/initramfs-${KERNEL_VERSION}.img,g" "${BLS_TARGET}"
                sed -i -e "s#^options.*#options ${BOOT_OPTIONS[*]}#g" "${BLS_TARGET}"
            else
                mkbls "${KERNEL_VERSION}" \
                    "$(date -u +%Y%m%d%H%M%S -d "$(stat -c '%y' "${KERNEL_DIR}")")" \
                    "${BOOT_OPTIONS[*]}" >"${BLS_TARGET}"
            fi

            if [[ "$KERNEL_VERSION" == *\+* ]] && [ "x$DEFAULTDEBUG" != "xyes" ]; then
                UPDATEDEFAULT="no"
            fi

            if [[ "x$UPDATEDEFAULT" = "xyes" ]]; then
                TITLE="$(grep '^title[ \t]' "${BLS_TARGET}" | sed -e 's/^title[ \t]*//')"
                NEWDEFAULT="${TITLE}"
            fi

            if [ "x${MAKEDEBUG}" = "xyes" ]; then
                BLS_DEBUG="$(echo ${BLS_TARGET} | sed -e "s/${KERNEL_VERSION}/${KERNEL_VERSION}~debug/")"
                cp -aT  "${BLS_TARGET}" "${BLS_DEBUG}"
                TITLE="$(grep '^title[ \t]' "${BLS_DEBUG}" | sed -e 's/^title[ \t]*//')"
		VERSION="$(grep '^version[ \t]' "${BLS_DEBUG}" | sed -e 's/^version[ \t]*//')"
                BLSID="$(grep '^id[ \t]' "${BLS_DEBUG}" | sed -e "s/${KERNEL_VERSION}/${KERNEL_VERSION}~debug/")"
                sed -i -e "s/^title.*/title ${TITLE}${LINUX_DEBUG_TITLE_POSTFIX}/" "${BLS_DEBUG}"
		sed -i -e "s/^version.*/version ${VERSION}${LINUX_DEBUG_VERSION_POSTFIX}/" "${BLS_DEBUG}"
                sed -i -e "s/^id.*/${BLSID}/" "${BLS_DEBUG}"
                sed -i -e "s#^options.*#options ${BOOT_OPTIONS[*]}${CMDLINE_LINUX_DEBUG}#" "${BLS_DEBUG}"
                if [ -n "$NEWDEFAULT" -a "x$DEFAULTDEBUG" = "xyes" ]; then
                    TITLE="$(grep '^title[ \t]' "${BLS_DEBUG}" | sed -e 's/^title[ \t]*//')"
                    NEWDEFAULT="${TITLE}"
                fi
	    fi

            if [ -n "$NEWDEFAULT" ]; then
                sed -i -e "s,^default=.*,default=${NEWDEFAULT}," "${ZIPLCFG}"
            fi

            exit 0
        fi

        /sbin/new-kernel-pkg --package "kernel${flavor}" --install "$KERNEL_VERSION" || exit $?
        /sbin/new-kernel-pkg --package "kernel${flavor}" --mkinitrd --dracut --depmod --update "$KERNEL_VERSION" || exit $?
        /sbin/new-kernel-pkg --package "kernel${flavor}" --rpmposttrans "$KERNEL_VERSION" || exit $?
        # If grubby is used there's no need to run other installation plugins
        exit 77
        ;;
    remove)
        if [[ ! -f /sbin/new-kernel-pkg ]]; then
            ARCH="$(uname -m)"
            BLS_TARGET="${BLS_DIR}/${MACHINE_ID}-${KERNEL_VERSION}.conf"
            BLS_DEBUG="$(echo ${BLS_TARGET} | sed -e "s/${KERNEL_VERSION}/${KERNEL_VERSION}~debug/")"

            TITLE="$(grep '^title[ \t]' "${BLS_TARGET}" | sed -e 's/^title[ \t]*//')"
            sed -i -e "/^default=${TITLE}/d" "${ZIPLCFG}"

            if [[ -f "${BLS_DEBUG}" ]]; then
                TITLE="$(grep '^title[ \t]' "${BLS_DEBUG}" | sed -e 's/^title[ \t]*//')"
                sed -i -e "/^default=${TITLE}/d" "${ZIPLCFG}"
            fi

            rm -f "${BLS_TARGET}" "${BLS_DEBUG}"

            for i in vmlinuz System.map config zImage.stub dtb; do
                rm -rf "/boot/${i}-${KERNEL_VERSION}"
            done
            # hmac is .vmlinuz-<version>.hmac so needs a special treatment
            rm -f "/boot/.vmlinuz-${KERNEL_VERSION}.hmac"

            exit 0
        fi

        /sbin/new-kernel-pkg --package "kernel${flavor+-$flavor}" --rminitrd --rmmoddep --remove "$KERNEL_VERSION" || exit $?
        # If grubby is used there's no need to run other installation plugins
        exit 77
        ;;
    *)
        ;;
esac