# These variables and functions are useful in 2nd kernel

. /lib/kdump-lib.sh

KDUMP_PATH="/var/crash"

KDUMP_LOG_FILE="/run/initramfs/kexec-dmesg.log"

CORE_COLLECTOR=""

DEFAULT_CORE_COLLECTOR="makedumpfile -l --message-level 7 -d 31"

DMESG_COLLECTOR="/sbin/vmcore-dmesg"

FAILURE_ACTION="systemctl reboot -f"

DATEDIR=`date +%Y-%m-%d-%T`

HOST_IP='127.0.0.1'

DUMP_INSTRUCTION=""

SSH_KEY_LOCATION="/root/.ssh/kdump_id_rsa"

KDUMP_SCRIPT_DIR="/kdumpscripts"

DD_BLKSIZE=512

FINAL_ACTION="systemctl reboot -f"

KDUMP_CONF="/etc/kdump.conf"

KDUMP_PRE=""

KDUMP_POST=""

NEWROOT="/sysroot"

OPALCORE="/sys/firmware/opal/mpipl/core"

#initiate the kdump logger

dlog_init

if [ $? -ne 0 ]; then

    echo "failed to initiate the kdump logger."

    exit 1

fi

get_kdump_confs()

{

    local config_opt config_val

    while read config_opt config_val;

    do

        # remove inline comments after the end of a directive.

        case "$config_opt" in

            path)

                KDUMP_PATH="$config_val"

            ;;

            core_collector)

                [ -n "$config_val" ] && CORE_COLLECTOR="$config_val"

            ;;

            sshkey)

                if [ -f "$config_val" ]; then

                    SSH_KEY_LOCATION=$config_val

                fi

            ;;

            kdump_pre)

                KDUMP_PRE="$config_val"

            ;;

            kdump_post)

                KDUMP_POST="$config_val"

            ;;

            fence_kdump_args)

                FENCE_KDUMP_ARGS="$config_val"

            ;;

            fence_kdump_nodes)

                FENCE_KDUMP_NODES="$config_val"

            ;;

            failure_action|default)

                case $config_val in

                    shell)

                        FAILURE_ACTION="kdump_emergency_shell"

                    ;;

                    reboot)

                        FAILURE_ACTION="systemctl reboot -f && exit"

                    ;;

                    halt)

                        FAILURE_ACTION="halt && exit"

                    ;;

                    poweroff)

                        FAILURE_ACTION="systemctl poweroff -f && exit"

                    ;;

                    dump_to_rootfs)

                        FAILURE_ACTION="dump_to_rootfs"

                    ;;

                esac

            ;;

            final_action)

                case $config_val in

                    reboot)

                        FINAL_ACTION="systemctl reboot -f"

                    ;;

                    halt)

                        FINAL_ACTION="halt"

                    ;;

                    poweroff)

                        FINAL_ACTION="systemctl poweroff -f"

                    ;;

                esac

            ;;

        esac

    done <<< "$(read_strip_comments $KDUMP_CONF)"

    if [ -z "$CORE_COLLECTOR" ]; then

        CORE_COLLECTOR="$DEFAULT_CORE_COLLECTOR"

        if is_ssh_dump_target || is_raw_dump_target; then

            CORE_COLLECTOR="$CORE_COLLECTOR -F"

        fi

    fi

}

# store the kexec kernel log to a file.

save_log()

{

    dmesg -T > $KDUMP_LOG_FILE

    if command -v journalctl > /dev/null; then

        journalctl -ab >> $KDUMP_LOG_FILE

    fi

}

# dump_fs <mount point>

dump_fs()

{

    local _exitcode

    local _mp=$1

    local _dev=$(get_mount_info SOURCE target $_mp -f)

    local _op=$(get_mount_info OPTIONS target $_mp -f)

    ddebug "_mp=$_mp _dev=$_dev _op=$_op"

    # If dump path have a corresponding device entry but not mounted, mount it.

    if [ -n "$_dev" ] && [ "$_dev" != "rootfs" ]; then

        if ! is_mounted "$_mp"; then

            dinfo "dump target $_dev is not mounted, trying to mount..."

            mkdir -p $_mp

            mount -o $_op $_dev $_mp

            if [ $? -ne 0 ]; then

                derror "mounting failed (mount point: $_mp, option: $_op)"

                return 1

            fi

        fi

    else

        derror "failed to dump to \"$_mp\", it's not a mount point!"

        return 1

    fi

    # Remove -F in makedumpfile case. We don't want a flat format dump here.

    [[ $CORE_COLLECTOR = *makedumpfile* ]] && CORE_COLLECTOR=`echo $CORE_COLLECTOR | sed -e "s/-F//g"`

    local _dump_path=$(echo "$_mp/$KDUMP_PATH/$HOST_IP-$DATEDIR/" | tr -s /)

    dinfo "saving to $_dump_path"

    # Only remount to read-write mode if the dump target is mounted read-only.

    if [[ "$_op" = "ro"* ]]; then

       dinfo "Mounting Dump target $_dev in rw mode."

       mount -o remount,rw $_dev $_mp || return 1

    fi

    mkdir -p $_dump_path || return 1

    save_vmcore_dmesg_fs ${DMESG_COLLECTOR} "$_dump_path"

    save_opalcore_fs "$_dump_path"

    dinfo "saving vmcore"

    $CORE_COLLECTOR /proc/vmcore $_dump_path/vmcore-incomplete

    _exitcode=$?

    if [ $_exitcode -eq 0 ]; then

        mv $_dump_path/vmcore-incomplete $_dump_path/vmcore

        sync

        dinfo "saving vmcore complete"

    else

        derror "saving vmcore failed, _exitcode:$_exitcode"

    fi

    save_log

    mv $KDUMP_LOG_FILE $_dump_path/

    if [ $_exitcode -ne 0 ]; then

        return 1

    fi

    # improper kernel cmdline can cause the failure of echo, we can ignore this kind of failure

    return 0

}

save_vmcore_dmesg_fs() {

    local _dmesg_collector=$1

    local _path=$2

    dinfo "saving vmcore-dmesg.txt to ${_path}"

    $_dmesg_collector /proc/vmcore > ${_path}/vmcore-dmesg-incomplete.txt

    _exitcode=$?

    if [ $_exitcode -eq 0 ]; then

        mv ${_path}/vmcore-dmesg-incomplete.txt ${_path}/vmcore-dmesg.txt

        # Make sure file is on disk. There have been instances where later

        # saving vmcore failed and system rebooted without sync and there

        # was no vmcore-dmesg.txt available.

        sync

        dinfo "saving vmcore-dmesg.txt complete"

    else

        derror "saving vmcore-dmesg.txt failed"

    fi

}

save_opalcore_fs() {

    local _path=$1

    if [ ! -f $OPALCORE ]; then

        # Check if we are on an old kernel that uses a different path

        if [ -f /sys/firmware/opal/core ]; then

            OPALCORE="/sys/firmware/opal/core"

        else

            return 0

        fi

    fi

    dinfo "saving opalcore:$OPALCORE to ${_path}/opalcore"

    cp $OPALCORE ${_path}/opalcore

    if [ $? -ne 0 ]; then

        derror "saving opalcore failed"

        return 1

    fi

    sync

    dinfo "saving opalcore complete"

    return 0

}

dump_to_rootfs()

{

    dinfo "Trying to bring up rootfs device"

    systemctl is-failed dracut-initqueue || systemctl start dracut-initqueue

    dinfo "Waiting for rootfs mount, will timeout after 90 seconds"

    systemctl start sysroot.mount

    ddebug "NEWROOT=$NEWROOT"

    dump_fs $NEWROOT

}

kdump_emergency_shell()

{

    echo "PS1=\"kdump:\\\${PWD}# \"" >/etc/profile

    ddebug "Switching to dracut emergency..."

    /bin/dracut-emergency

    rm -f /etc/profile

}

do_failure_action()

{

    dinfo "Executing failure action $FAILURE_ACTION"

    eval $FAILURE_ACTION

}

do_final_action()

{

    dinfo "Executing final action $FINAL_ACTION"

    eval $FINAL_ACTION

}