#!/bin/bash

#

# Kdump common variables and functions

#

. /usr/lib/kdump/kdump-lib-initramfs.sh

FADUMP_ENABLED_SYS_NODE="/sys/kernel/fadump_enabled"

is_fadump_capable()

{

	# Check if firmware-assisted dump is enabled

	# if no, fallback to kdump check

	if [[ -f $FADUMP_ENABLED_SYS_NODE ]]; then

		rc=$(< $FADUMP_ENABLED_SYS_NODE)

		[[ $rc -eq 1 ]] && return 0

	fi

	return 1

}

is_squash_available()

{

	for kmodule in squashfs overlay loop; do

		if [[ -z $KDUMP_KERNELVER ]]; then

			modprobe --dry-run $kmodule &> /dev/null || return 1

		else

			modprobe -S "$KDUMP_KERNELVER" --dry-run $kmodule &> /dev/null || return 1

		fi

	done

}

is_zstd_command_available()

{

	[[ -x "$(command -v zstd)" ]]

}

dracut_have_option()

{

	local _option=$1

	! dracut "$_option" 2>&1 | grep -q "unrecognized option"

}

perror_exit()

{

	derror "$@"

	exit 1

}

# Check if fence kdump is configured in Pacemaker cluster

is_pcs_fence_kdump()

{

	# no pcs or fence_kdump_send executables installed?

	type -P pcs > /dev/null || return 1

	[[ -x $FENCE_KDUMP_SEND ]] || return 1

	# fence kdump not configured?

	(pcs cluster cib | grep 'type="fence_kdump"') &> /dev/null || return 1

}

# Check if fence_kdump is configured using kdump options

is_generic_fence_kdump()

{

	[[ -x $FENCE_KDUMP_SEND ]] || return 1

	[[ $(kdump_get_conf_val fence_kdump_nodes) ]]

}

to_dev_name()

{

	local dev="${1//\"/}"

	case "$dev" in

	UUID=*)

		blkid -U "${dev#UUID=}"

		;;

	LABEL=*)

		blkid -L "${dev#LABEL=}"

		;;

	*)

		echo "$dev"

		;;

	esac

}

is_user_configured_dump_target()

{

	[[ $(kdump_get_conf_val "ext[234]\|xfs\|btrfs\|minix\|raw\|nfs\|ssh\|virtiofs") ]] || is_mount_in_dracut_args

}

get_block_dump_target()

{

	local _target _fstype

	if is_ssh_dump_target || is_nfs_dump_target; then

		return

	fi

	_target=$(kdump_get_conf_val "ext[234]\|xfs\|btrfs\|minix\|raw\|virtiofs")

	[[ -n $_target ]] && to_dev_name "$_target" && return

	_target=$(get_dracut_args_target "$(kdump_get_conf_val "dracut_args")")

	[[ -b $_target ]] && to_dev_name "$_target" && return

	_fstype=$(get_dracut_args_fstype "$(kdump_get_conf_val "dracut_args")")

	is_fs_type_virtiofs "$_fstype" && echo "$_target" && return

	_target=$(get_target_from_path "$(get_save_path)")

	[[ -b $_target ]] && to_dev_name "$_target" && return

	_fstype=$(get_fs_type_from_target "$_target")

	is_fs_type_virtiofs "$_fstype" && echo "$_target" && return

}

is_dump_to_rootfs()

{

	[[ $(kdump_get_conf_val 'failure_action\|default') == dump_to_rootfs ]]

}

is_lvm2_thinp_dump_target()

{

	_target=$(get_block_dump_target)

	[ -n "$_target" ] && is_lvm2_thinp_device "$_target"

}

get_failure_action_target()

{

	local _target

	if is_dump_to_rootfs; then

		# Get rootfs device name

		_target=$(get_root_fs_device)

		[[ -b $_target ]] && to_dev_name "$_target" && return

		is_fs_type_virtiofs "$(get_fs_type_from_target "$_target")" && echo "$_target" && return

		# Then, must be nfs root

		echo "nfs"

	fi

}

# Get kdump targets(including root in case of dump_to_rootfs).

get_kdump_targets()

{

	local _target _root

	local kdump_targets

	_target=$(get_block_dump_target)

	if [[ -n $_target ]]; then

		kdump_targets=$_target

	elif is_ssh_dump_target; then

		kdump_targets="ssh"

	else

		kdump_targets="nfs"

	fi

	# Add the root device if dump_to_rootfs is specified.

	_root=$(get_failure_action_target)

	if [[ -n $_root ]] && [[ $kdump_targets != "$_root" ]]; then

		kdump_targets="$kdump_targets $_root"

	fi

	echo "$kdump_targets"

}

# Return the bind mount source path, return the path itself if it's not bind mounted

# Eg. if /path/to/src is bind mounted to /mnt/bind, then:

# /mnt/bind -> /path/to/src, /mnt/bind/dump -> /path/to/src/dump

#

# findmnt uses the option "-v, --nofsroot" to exclusive the [/dir]

# in the SOURCE column for bind-mounts, then if $_src equals to

# $_src_nofsroot, the mountpoint is not bind mounted directory.

#

# Below is just an example for mount info

# /dev/mapper/atomicos-root[/ostree/deploy/rhel-atomic-host/var], if the

# directory is bind mounted. The former part represents the device path, rest

# part is the bind mounted directory which quotes by bracket "[]".

get_bind_mount_source()

{

	local _mnt _path _src _opt _fstype

	local _fsroot _src_nofsroot

	_mnt=$(df "$1" | tail -1 | awk '{print $NF}')

	_path=${1#$_mnt}

	_src=$(get_mount_info SOURCE target "$_mnt" -f)

	_opt=$(get_mount_info OPTIONS target "$_mnt" -f)

	_fstype=$(get_mount_info FSTYPE target "$_mnt" -f)

	# bind mount in fstab

	if [[ -d $_src ]] && [[ $_fstype == none ]] && (echo "$_opt" | grep -q "\bbind\b"); then

		echo "$_src$_path" && return

	fi

	# direct mount

	_src_nofsroot=$(get_mount_info SOURCE target "$_mnt" -v -f)

	if [[ $_src_nofsroot == "$_src" ]]; then

		echo "$_mnt$_path" && return

	fi

	_fsroot=${_src#${_src_nofsroot}[}

	_fsroot=${_fsroot%]}

	_mnt=$(get_mount_info TARGET source "$_src_nofsroot" -f)

	# for btrfs, _fsroot will also contain the subvol value as well, strip it

	if [[ $_fstype == btrfs ]]; then

		local _subvol

		_subvol=${_opt#*subvol=}

		_subvol=${_subvol%,*}

		_fsroot=${_fsroot#$_subvol}

	fi

	echo "$_mnt$_fsroot$_path"

}

get_mntopt_from_target()

{

	get_mount_info OPTIONS source "$1" -f

}

# Get the path where the target will be mounted in kdump kernel

# $1: kdump target device

get_kdump_mntpoint_from_target()

{

	local _mntpoint

	_mntpoint=$(get_mntpoint_from_target "$1")

	# mount under /sysroot if dump to root disk or mount under

	# mount under /kdumproot if dump target is not mounted in first kernel

	# mount under /kdumproot/$_mntpoint in other cases in 2nd kernel.

	# systemd will be in charge to umount it.

	if [[ -z $_mntpoint ]]; then

		_mntpoint="/kdumproot"

	else

		if [[ $_mntpoint == "/" ]]; then

			_mntpoint="/sysroot"

		else

			_mntpoint="/kdumproot/$_mntpoint"

		fi

	fi

	# strip duplicated "/"

	echo $_mntpoint | tr -s "/"

}

kdump_get_persistent_dev()

{

	local dev="${1//\"/}"

	case "$dev" in

	UUID=*)

		dev=$(blkid -U "${dev#UUID=}")

		;;

	LABEL=*)

		dev=$(blkid -L "${dev#LABEL=}")

		;;

	esac

	echo $(get_persistent_dev "$dev")

}

is_atomic()

{

	grep -q "ostree" /proc/cmdline

}

# get ip address or hostname from nfs/ssh config value

get_remote_host()

{

	local _config_val=$1

	# ipv6 address in kdump.conf is around with "[]",

	# factor out the ipv6 address

	_config_val=${_config_val#*@}

	_config_val=${_config_val%:/*}

	_config_val=${_config_val#[}

	_config_val=${_config_val%]}

	echo "$_config_val"

}

is_hostname()

{

	local _hostname

	_hostname=$(echo "$1" | grep ":")

	if [[ -n $_hostname ]]; then

		return 1

	fi

	echo "$1" | grep -q "[a-zA-Z]"

}

# Copied from "/etc/sysconfig/network-scripts/network-functions"

get_hwaddr()

{

	if [[ -f "/sys/class/net/$1/address" ]]; then

		awk '{ print toupper($0) }' < "/sys/class/net/$1/address"

	elif [[ -d "/sys/class/net/$1" ]]; then

		LC_ALL="" LANG="" ip -o link show "$1" 2> /dev/null |

			awk '{ print toupper(gensub(/.*link\/[^ ]* ([[:alnum:]:]*).*/,

                                        "\\1", 1)); }'

	fi

}

# Get value by a field using "nmcli -g"

# Usage: get_nmcli_value_by_field <field> <nmcli command>

#

# "nmcli --get-values" allows us to retrive value(s) by field, for example,

# nmcli --get-values <field> connection show /org/freedesktop/NetworkManager/ActiveConnection/1

# returns the following value for the corresponding field respectively,

#   Field                                  Value

#   IP4.DNS                                "10.19.42.41 | 10.11.5.19 | 10.5.30.160"

#   802-3-ethernet.s390-subchannels        ""

#   bond.options                           "mode=balance-rr"

get_nmcli_value_by_field()

{

	LANG=C nmcli --get-values "$@"

}

# Get nmcli field value of an connection apath (a D-Bus active connection path)

# Usage: get_nmcli_field_by_apath <field> <apath>

get_nmcli_field_by_conpath()

{

	local _field=$1 _apath=$2

	get_nmcli_value_by_field "$_field" connection show "$_apath"

}

# Get nmcli connection apath (a D-Bus active connection path ) by ifname

#

# apath is used for nmcli connection operations, e.g.

#  $ nmcli connection show $apath

get_nmcli_connection_apath_by_ifname()

{

	local _ifname=$1

	get_nmcli_value_by_field "GENERAL.CON-PATH" device show "$_ifname"

}

get_ifcfg_by_device()

{

	grep -E -i -l "^[[:space:]]*DEVICE=\"*${1}\"*[[:space:]]*$" \

		/etc/sysconfig/network-scripts/ifcfg-* 2> /dev/null | head -1

}

get_ifcfg_by_hwaddr()

{

	grep -E -i -l "^[[:space:]]*HWADDR=\"*${1}\"*[[:space:]]*$" \

		/etc/sysconfig/network-scripts/ifcfg-* 2> /dev/null | head -1

}

get_ifcfg_by_uuid()

{

	grep -E -i -l "^[[:space:]]*UUID=\"*${1}\"*[[:space:]]*$" \

		/etc/sysconfig/network-scripts/ifcfg-* 2> /dev/null | head -1

}

get_ifcfg_by_name()

{

	grep -E -i -l "^[[:space:]]*NAME=\"*${1}\"*[[:space:]]*$" \

		/etc/sysconfig/network-scripts/ifcfg-* 2> /dev/null | head -1

}

is_nm_running()

{

	[[ "$(LANG=C nmcli -t --fields running general status 2> /dev/null)" == "running" ]]

}

is_nm_handling()

{

	LANG=C nmcli -t --fields device,state dev status 2> /dev/null |

		grep -q "^\(${1}:connected\)\|\(${1}:connecting.*\)$"

}

# $1: netdev name

get_ifcfg_nmcli()

{

	local nm_uuid nm_name

	local ifcfg_file

	# Get the active nmcli config name of $1

	if is_nm_running && is_nm_handling "${1}"; then

		# The configuration "uuid" and "name" generated by nm is wrote to

		# the ifcfg file as "UUID=<nm_uuid>" and "NAME=<nm_name>".

		nm_uuid=$(LANG=C nmcli -t --fields uuid,device c show --active 2> /dev/null |

			grep "${1}" | head -1 | cut -d':' -f1)

		nm_name=$(LANG=C nmcli -t --fields name,device c show --active 2> /dev/null |

			grep "${1}" | head -1 | cut -d':' -f1)

		ifcfg_file=$(get_ifcfg_by_uuid "${nm_uuid}")

		[[ -z ${ifcfg_file} ]] && ifcfg_file=$(get_ifcfg_by_name "${nm_name}")

	fi

	echo -n "${ifcfg_file}"

}

# $1: netdev name

get_ifcfg_legacy()

{

	local ifcfg_file hwaddr

	ifcfg_file="/etc/sysconfig/network-scripts/ifcfg-${1}"

	[[ -f ${ifcfg_file} ]] && echo -n "${ifcfg_file}" && return

	ifcfg_file=$(get_ifcfg_by_name "${1}")

	[[ -f ${ifcfg_file} ]] && echo -n "${ifcfg_file}" && return

	hwaddr=$(get_hwaddr "${1}")

	if [[ -n $hwaddr ]]; then

		ifcfg_file=$(get_ifcfg_by_hwaddr "${hwaddr}")

		[[ -f ${ifcfg_file} ]] && echo -n "${ifcfg_file}" && return

	fi

	ifcfg_file=$(get_ifcfg_by_device "${1}")

	echo -n "${ifcfg_file}"

}

# $1: netdev name

# Return the ifcfg file whole name(including the path) of $1 if any.

get_ifcfg_filename()

{

	local ifcfg_file

	ifcfg_file=$(get_ifcfg_nmcli "${1}")

	if [[ -z ${ifcfg_file} ]]; then

		ifcfg_file=$(get_ifcfg_legacy "${1}")

	fi

	echo -n "${ifcfg_file}"

}

# returns 0 when omission of a module is desired in dracut_args

# returns 1 otherwise

is_dracut_mod_omitted()

{

	local dracut_args dracut_mod=$1

	set -- $(kdump_get_conf_val dracut_args)

	while [ $# -gt 0 ]; do

		case $1 in

		-o | --omit)

			[[ " ${2//[^[:alnum:]]/ } " == *" $dracut_mod "* ]] && return 0

			;;

		esac

		shift

	done

	return 1

}

is_wdt_active()

{

	local active

	[[ -d /sys/class/watchdog ]] || return 1

	for dir in /sys/class/watchdog/*; do

		[[ -f "$dir/state" ]] || continue

		active=$(< "$dir/state")

		[[ $active == "active" ]] && return 0

	done

	return 1

}

have_compression_in_dracut_args()

{

	[[ "$(kdump_get_conf_val dracut_args)" =~ (^|[[:space:]])--(gzip|bzip2|lzma|xz|lzo|lz4|zstd|no-compress|compress|squash-compressor)([[:space:]]|$) ]]

}

# If "dracut_args" contains "--mount" information, use it

# directly without any check(users are expected to ensure

# its correctness).

is_mount_in_dracut_args()

{

	[[ " $(kdump_get_conf_val dracut_args)" =~ .*[[:space:]]--mount[=[:space:]].* ]]

}

check_crash_mem_reserved()

{

	local mem_reserved

	mem_reserved=$(< /sys/kernel/kexec_crash_size)

	if [[ $mem_reserved -eq 0 ]]; then

		derror "No memory reserved for crash kernel"

		return 1

	fi

	return 0

}

check_kdump_feasibility()

{

	if [[ ! -e /sys/kernel/kexec_crash_loaded ]]; then

		derror "Kdump is not supported on this kernel"

		return 1

	fi

	check_crash_mem_reserved

	return $?

}

check_current_kdump_status()

{

	if [[ ! -f /sys/kernel/kexec_crash_loaded ]]; then

		derror "Perhaps CONFIG_CRASH_DUMP is not enabled in kernel"

		return 1

	fi

	rc=$(< /sys/kernel/kexec_crash_loaded)

	if [[ $rc == 1 ]]; then

		return 0

	else

		return 1

	fi

}

# remove_cmdline_param <kernel cmdline> <param1> [<param2>] ... [<paramN>]

# Remove a list of kernel parameters from a given kernel cmdline and print the result.

# For each "arg" in the removing params list, "arg" and "arg=xxx" will be removed if exists.

remove_cmdline_param()

{

	local cmdline=$1

	shift

	for arg in "$@"; do

		cmdline=$(echo "$cmdline" |

			sed -e "s/\b$arg=[^ ]*//g" \

				-e "s/^$arg\b//g" \

				-e "s/[[:space:]]$arg\b//g" \

				-e "s/\s\+/ /g")

	done

	echo "$cmdline"

}

#

# This function returns the "apicid" of the boot

# cpu (cpu 0) if present.

#

get_bootcpu_apicid()

{

	awk '                                                       \

        BEGIN { CPU = "-1"; }                                   \

        $1=="processor" && $2==":"      { CPU = $NF; }          \

        CPU=="0" && /^apicid/           { print $NF; }          \

        ' \

		/proc/cpuinfo

}

#

# append_cmdline <kernel cmdline> <parameter name> <parameter value>

# This function appends argument "$2=$3" to string ($1) if not already present.

#

append_cmdline()

{

	local cmdline=$1

	local newstr=${cmdline/$2/""}

	# unchanged str implies argument wasn't there

	if [[ $cmdline == "$newstr" ]]; then

		cmdline="${cmdline} ${2}=${3}"

	fi

	echo "$cmdline"

}

# This function check iomem and determines if we have more than

# 4GB of ram available. Returns 1 if we do, 0 if we dont

need_64bit_headers()

{

	return "$(tail -n 1 /proc/iomem | awk '{ split ($1, r, "-");

        print (strtonum("0x" r[2]) > strtonum("0xffffffff")); }')"

}

# Check if secure boot is being enforced.

#

# Per Peter Jones, we need check efivar SecureBoot-$(the UUID) and

# SetupMode-$(the UUID), they are both 5 bytes binary data. The first four

# bytes are the attributes associated with the variable and can safely be

# ignored, the last bytes are one-byte true-or-false variables. If SecureBoot

# is 1 and SetupMode is 0, then secure boot is being enforced.

#

# Assume efivars is mounted at /sys/firmware/efi/efivars.

is_secure_boot_enforced()

{

	local secure_boot_file setup_mode_file

	local secure_boot_byte setup_mode_byte

	# On powerpc, secure boot is enforced if:

	#   host secure boot: /ibm,secure-boot/os-secureboot-enforcing DT property exists

	#   guest secure boot: /ibm,secure-boot >= 2

	if [[ -f /proc/device-tree/ibm,secureboot/os-secureboot-enforcing ]]; then

		return 0

	fi

	if [[ -f /proc/device-tree/ibm,secure-boot ]] &&

		[[ $(lsprop /proc/device-tree/ibm,secure-boot | tail -1) -ge 2 ]]; then

			return 0

	fi

	# Detect secure boot on x86 and arm64

	secure_boot_file=$(find /sys/firmware/efi/efivars -name "SecureBoot-*" 2> /dev/null)

	setup_mode_file=$(find /sys/firmware/efi/efivars -name "SetupMode-*" 2> /dev/null)

	if [[ -f $secure_boot_file ]] && [[ -f $setup_mode_file ]]; then

		secure_boot_byte=$(hexdump -v -e '/1 "%d\ "' "$secure_boot_file" | cut -d' ' -f 5)

		setup_mode_byte=$(hexdump -v -e '/1 "%d\ "' "$setup_mode_file" | cut -d' ' -f 5)

		if [[ $secure_boot_byte == "1" ]] && [[ $setup_mode_byte == "0" ]]; then

			return 0

		fi

	fi

	# Detect secure boot on s390x

	if [[ -e "/sys/firmware/ipl/secure" && "$(< /sys/firmware/ipl/secure)" == "1" ]]; then

		return 0

	fi

	return 1

}

#

# prepare_kexec_args <kexec args>

# This function prepares kexec argument.

#

prepare_kexec_args()

{

	local kexec_args=$1

	local found_elf_args

	ARCH=$(uname -m)

	if [[ $ARCH == "i686" ]] || [[ $ARCH == "i386" ]]; then

		need_64bit_headers

		if [[ $? == 1 ]]; then

			found_elf_args=$(echo "$kexec_args" | grep elf32-core-headers)

			if [[ -n $found_elf_args ]]; then

				dwarn "Warning: elf32-core-headers overrides correct elf64 setting"

			else

				kexec_args="$kexec_args --elf64-core-headers"

			fi

		else

			found_elf_args=$(echo "$kexec_args" | grep elf64-core-headers)

			if [[ -z $found_elf_args ]]; then

				kexec_args="$kexec_args --elf32-core-headers"

			fi

		fi

	fi

	echo "$kexec_args"

}

# prepare_kdump_kernel <kdump_kernelver>

# This function return kdump_kernel given a kernel version.

prepare_kdump_kernel()

{

	local kdump_kernelver=$1

	local dir img boot_dirlist boot_imglist kdump_kernel machine_id

	read -r machine_id < /etc/machine-id

	boot_dirlist=${KDUMP_BOOTDIR:-"/boot /boot/efi /efi /"}

	boot_imglist="$KDUMP_IMG-$kdump_kernelver$KDUMP_IMG_EXT $machine_id/$kdump_kernelver/$KDUMP_IMG"

	# Use BOOT_IMAGE as reference if possible, strip the GRUB root device prefix in (hd0,gpt1) format

	boot_img="$(sed "s/^BOOT_IMAGE=\((\S*)\)\?\(\S*\) .*/\2/" /proc/cmdline)"

	if [[ "$boot_img" == *"$kdump_kernelver" ]]; then

		boot_imglist="$boot_img $boot_imglist"

	fi

	for dir in $boot_dirlist; do

		for img in $boot_imglist; do

			if [[ -f "$dir/$img" ]]; then

				kdump_kernel=$(echo "$dir/$img" | tr -s '/')

				break 2

			fi

		done

	done

	echo "$kdump_kernel"

}

#

# Detect initrd and kernel location, results are stored in global environmental variables:

# KDUMP_BOOTDIR, KDUMP_KERNELVER, KDUMP_KERNEL, DEFAULT_INITRD, and KDUMP_INITRD

#

# Expectes KDUMP_BOOTDIR, KDUMP_IMG, KDUMP_IMG_EXT, KDUMP_KERNELVER to be loaded from config already

# and will prefer already set values so user can specify custom kernel/initramfs location

#

prepare_kdump_bootinfo()

{

	local boot_initrdlist nondebug_kernelver debug_kernelver

	local default_initrd_base var_target_initrd_dir

	if [[ -z $KDUMP_KERNELVER ]]; then

		KDUMP_KERNELVER=$(uname -r)

		# Fadump uses the regular bootloader, unlike kdump. So, use the same version

		# for default kernel and capture kernel unless specified explicitly with

		# KDUMP_KERNELVER option.

		if ! is_fadump_capable; then

			nondebug_kernelver=$(sed -n -e 's/\(.*\)+debug$/\1/p' <<< "$KDUMP_KERNELVER")

		fi

	fi

	# Use nondebug kernel if possible, because debug kernel will consume more memory and may oom.

	if [[ -n $nondebug_kernelver ]]; then

		dinfo "Trying to use $nondebug_kernelver."

		debug_kernelver=$KDUMP_KERNELVER

		KDUMP_KERNELVER=$nondebug_kernelver

	fi

	KDUMP_KERNEL=$(prepare_kdump_kernel "$KDUMP_KERNELVER")

	if ! [[ -e $KDUMP_KERNEL ]]; then

		if [[ -n $debug_kernelver ]]; then

			dinfo "Fallback to using debug kernel"

			KDUMP_KERNELVER=$debug_kernelver

			KDUMP_KERNEL=$(prepare_kdump_kernel "$KDUMP_KERNELVER")

		fi

	fi

	if ! [[ -e $KDUMP_KERNEL ]]; then

		derror "Failed to detect kdump kernel location"

		return 1

	fi

	if [[ "$KDUMP_KERNEL" == *"+debug" ]]; then

		dwarn "Using debug kernel, you may need to set a larger crashkernel than the default value."

	fi

	# Set KDUMP_BOOTDIR to where kernel image is stored

	KDUMP_BOOTDIR=$(dirname "$KDUMP_KERNEL")

	# Default initrd should just stay aside of kernel image, try to find it in KDUMP_BOOTDIR

	boot_initrdlist="initramfs-$KDUMP_KERNELVER.img initrd"

	for initrd in $boot_initrdlist; do

		if [[ -f "$KDUMP_BOOTDIR/$initrd" ]]; then

			default_initrd_base="$initrd"

			DEFAULT_INITRD="$KDUMP_BOOTDIR/$default_initrd_base"

			break

		fi

	done

	# Create kdump initrd basename from default initrd basename

	# initramfs-5.7.9-200.fc32.x86_64.img => initramfs-5.7.9-200.fc32.x86_64kdump.img

	# initrd => initrdkdump

	if [[ -z $default_initrd_base ]]; then

		kdump_initrd_base=initramfs-${KDUMP_KERNELVER}kdump.img

	elif [[ $default_initrd_base == *.* ]]; then

		kdump_initrd_base=${default_initrd_base%.*}kdump.${DEFAULT_INITRD##*.}

	else

		kdump_initrd_base=${default_initrd_base}kdump

	fi

	# Place kdump initrd in $(/var/lib/kdump) if $(KDUMP_BOOTDIR) not writable

	if [[ ! -w $KDUMP_BOOTDIR ]]; then

		var_target_initrd_dir="/var/lib/kdump"

		mkdir -p "$var_target_initrd_dir"

		KDUMP_INITRD="$var_target_initrd_dir/$kdump_initrd_base"

	else

		KDUMP_INITRD="$KDUMP_BOOTDIR/$kdump_initrd_base"

	fi

}

get_watchdog_drvs()

{

	local _wdtdrvs _drv _dir

	for _dir in /sys/class/watchdog/*; do

		# device/modalias will return driver of this device

		[[ -f "$_dir/device/modalias" ]] || continue

		_drv=$(< "$_dir/device/modalias")

		_drv=$(modprobe --set-version "$KDUMP_KERNELVER" -R "$_drv" 2> /dev/null)

		for i in $_drv; do

			if ! [[ " $_wdtdrvs " == *" $i "* ]]; then

				_wdtdrvs="$_wdtdrvs $i"

			fi

		done

	done

	echo "$_wdtdrvs"

}

#

# prepare_cmdline <commandline> <commandline remove> <commandline append>

# This function performs a series of edits on the command line.

# Store the final result in global $KDUMP_COMMANDLINE.

prepare_cmdline()

{

	local cmdline id arg

	if [[ -z $1 ]]; then

		cmdline=$(< /proc/cmdline)

	else

		cmdline="$1"

	fi