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Dir : /proc/self/root/lib/dracut/modules.d/99earlykdump/
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Dir : //proc/self/root/lib/dracut/modules.d/99earlykdump/early-kdump.sh

#! /bin/sh

KEXEC=/sbin/kexec
standard_kexec_args="-p"

EARLY_KDUMP_INITRD=""
EARLY_KDUMP_KERNEL=""
EARLY_KDUMP_CMDLINE=""
EARLY_KDUMP_KERNELVER=""
EARLY_KEXEC_ARGS=""

. /etc/sysconfig/kdump
. /lib/dracut-lib.sh
. /lib/kdump-lib.sh
. /lib/kdump-logger.sh

#initiate the kdump logger
dlog_init
if [ $? -ne 0 ]; then
        echo "failed to initiate the kdump logger."
        exit 1
fi

prepare_parameters()
{
    EARLY_KDUMP_CMDLINE=$(prepare_cmdline "${KDUMP_COMMANDLINE}" "${KDUMP_COMMANDLINE_REMOVE}" "${KDUMP_COMMANDLINE_APPEND}")
    EARLY_KDUMP_KERNEL="/boot/kernel-earlykdump"
    EARLY_KDUMP_INITRD="/boot/initramfs-earlykdump"
}

early_kdump_load()
{
    check_kdump_feasibility
    if [ $? -ne 0 ]; then
        return 1
    fi

    if is_fadump_capable; then
        dwarn "WARNING: early kdump doesn't support fadump."
        return 1
    fi

    check_current_kdump_status
    if [ $? == 0 ]; then
        return 1
    fi

    prepare_parameters

    EARLY_KEXEC_ARGS=$(prepare_kexec_args "${KEXEC_ARGS}")

    # Here, only output the messages, but do not save these messages
    # to a file because the target disk may not be mounted yet, the
    # earlykdump is too early.
    ddebug "earlykdump: $KEXEC ${EARLY_KEXEC_ARGS} $standard_kexec_args \
	--command-line=$EARLY_KDUMP_CMDLINE --initrd=$EARLY_KDUMP_INITRD \
	$EARLY_KDUMP_KERNEL"

    $KEXEC ${EARLY_KEXEC_ARGS} $standard_kexec_args \
        --command-line="$EARLY_KDUMP_CMDLINE" \
        --initrd=$EARLY_KDUMP_INITRD $EARLY_KDUMP_KERNEL
    if [ $? == 0 ]; then
        dinfo "kexec: loaded early-kdump kernel"
        return 0
    else
        derror "kexec: failed to load early-kdump kernel"
        return 1
    fi
}

set_early_kdump()
{
    if getargbool 0 rd.earlykdump; then
        dinfo "early-kdump is enabled."
        early_kdump_load
    else
        dinfo "early-kdump is disabled."
    fi

    return 0
}

set_early_kdump