#!/bin/bash

kdump_module_init() {

    if ! [[ -d "${initdir}/tmp" ]]; then

        mkdir -p "${initdir}/tmp"

    fi

    . /lib/kdump/kdump-lib.sh

}

check() {

    [[ $debug ]] && set -x

    #kdumpctl sets this explicitly

    if [[ -z $IN_KDUMP ]] || [[ ! -f /etc/kdump.conf ]]; then

        return 1

    fi

    return 0

}

depends() {

    local _dep="base shutdown"

    kdump_module_init

    add_opt_module() {

        [[ " $omit_dracutmodules " != *\ $1\ * ]] && _dep="$_dep $1"

    }

    if is_squash_available; then

        add_opt_module squash

    else

        dwarning "Required modules to build a squashed kdump image is missing!"

    fi

    if is_wdt_active; then

        add_opt_module watchdog

    fi

    if is_ssh_dump_target; then

        _dep="$_dep ssh-client"

    fi

    if [[ "$(uname -m)" == "s390x" ]]; then

        _dep="$_dep znet"

    fi

    if [[ -n "$(ls -A /sys/class/drm 2> /dev/null)" ]] || [[ -d /sys/module/hyperv_fb ]]; then

        add_opt_module drm

    fi

    if is_generic_fence_kdump || is_pcs_fence_kdump; then

        _dep="$_dep network"

    fi

    echo "$_dep"

}

kdump_is_bridge() {

    [[ -d /sys/class/net/"$1"/bridge ]]

}

kdump_is_bond() {

    [[ -d /sys/class/net/"$1"/bonding ]]

}

kdump_is_team() {

    [[ -f /usr/bin/teamnl ]] && teamnl "$1" ports &> /dev/null

}

kdump_is_vlan() {

    [[ -f /proc/net/vlan/"$1" ]]

}

# $1: netdev name

source_ifcfg_file() {

    local ifcfg_file

    dwarning "Network Scripts are deprecated. You are encouraged to set up network by NetworkManager."

    ifcfg_file=$(get_ifcfg_filename "$1")

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

        . "${ifcfg_file}"

    else

        dwarning "The ifcfg file of $1 is not found!"

    fi

}

kdump_setup_dns() {

    local _netdev="$1"

    local _conpath="$2"

    local _nameserver _dns _tmp array

    local _dnsfile=${initdir}/etc/cmdline.d/42dns.conf

    _tmp=$(get_nmcli_field_by_conpath "IP4.DNS" "$_conpath")

    # shellcheck disable=SC2206

    array=(${_tmp//|/ })

    if [[ ${array[*]} ]]; then

        for _dns in "${array[@]}"; do

            echo "nameserver=$_dns" >> "$_dnsfile"

        done

    else

        dwarning "Failed to get DNS info via nmcli output. Now try sourcing ifcfg script"

        source_ifcfg_file "$_netdev"

        [[ -n $DNS1 ]] && echo "nameserver=$DNS1" > "$_dnsfile"

        [[ -n $DNS2 ]] && echo "nameserver=$DNS2" >> "$_dnsfile"

    fi

    while read -r content; do

        _nameserver=$(echo "$content" | grep ^nameserver)

        [[ -z $_nameserver ]] && continue

        _dns=$(echo "$_nameserver" | awk '{print $2}')

        [[ -z $_dns ]] && continue

        if [[ ! -f $_dnsfile ]] || ! grep -q "$_dns" "$_dnsfile"; then

            echo "nameserver=$_dns" >> "$_dnsfile"

        fi

    done < "/etc/resolv.conf"

}

# $1: repeat times

# $2: string to be repeated

# $3: separator

repeatedly_join_str() {

    local _count="$1"

    local _str="$2"

    local _separator="$3"

    local i _res

    if [[ $_count -le 0 ]]; then

        echo -n ""

        return

    fi

    i=0

    _res="$_str"

    ((_count--))

    while [[ $i -lt $_count ]]; do

        ((i++))

        _res="${_res}${_separator}${_str}"

    done

    echo -n "$_res"

}

# $1: prefix

# $2: ipv6_flag="-6" indicates it's IPv6

# Given a prefix, calculate the netmask (equivalent of "ipcalc -m")

# by concatenating three parts,

#  1) the groups with all bits set 1

#  2) a group with partial bits set to 0

#  3) the groups with all bits set to 0

cal_netmask_by_prefix() {

    local _prefix="$1"

    local _ipv6_flag="$2" _ipv6

    local _bits_per_octet=8

    local _count _res _octets_per_group _octets_total _seperator _total_groups

    local _max_group_value _max_group_value_repr _bits_per_group _tmp _zero_bits

    if [[ $_ipv6_flag == "-6" ]]; then

        _ipv6=1

    else

        _ipv6=0

    fi

    if [[ $_prefix -lt 0 || $_prefix -gt 128 ]] \

        || ( ((!_ipv6)) && [[ $_prefix -gt 32 ]]); then

        derror "Bad prefix:$_prefix for calculating netmask"

        exit 1

    fi

    if ((_ipv6)); then

        _octets_per_group=2

        _octets_total=16

        _seperator=":"

    else

        _octets_per_group=1

        _octets_total=4

        _seperator="."

    fi

    _total_groups=$((_octets_total / _octets_per_group))

    _bits_per_group=$((_octets_per_group * _bits_per_octet))

    _max_group_value=$(((1 << _bits_per_group) - 1))

    if ((_ipv6)); then

        _max_group_value_repr=$(printf "%x" $_max_group_value)

    else

        _max_group_value_repr="$_max_group_value"

    fi

    _count=$((_prefix / _octets_per_group / _bits_per_octet))

    _first_part=$(repeatedly_join_str "$_count" "$_max_group_value_repr" "$_seperator")

    _res="$_first_part"

    _tmp=$((_octets_total * _bits_per_octet - _prefix))

    _zero_bits=$((_tmp % _bits_per_group))

    if [[ $_zero_bits -ne 0 ]]; then

        _second_part=$((_max_group_value >> _zero_bits << _zero_bits))

        if ((_ipv6)); then

            _second_part=$(printf "%x" $_second_part)

        fi

        ((_count++))

        if [[ -z $_first_part ]]; then

            _res="$_second_part"

        else

            _res="${_first_part}${_seperator}${_second_part}"

        fi

    fi

    _count=$((_total_groups - _count))

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

        echo -n "$_res"

        return

    fi

    if ((_ipv6)) && [[ $_count -gt 1 ]]; then

        # use condensed notion for IPv6

        _third_part=":"

    else

        _third_part=$(repeatedly_join_str "$_count" "0" "$_seperator")

    fi

    if [[ -z $_res ]] && ((!_ipv6)); then

        echo -n "${_third_part}"

    else

        echo -n "${_res}${_seperator}${_third_part}"

    fi

}

#$1: netdev name

#$2: srcaddr

#if it use static ip echo it, or echo null

kdump_static_ip() {

    local _netdev="$1" _srcaddr="$2" kdumpnic="$3" _ipv6_flag

    local _netmask _gateway _ipaddr _target _nexthop _prefix

    _ipaddr=$(ip addr show dev "$_netdev" permanent | awk "/ $_srcaddr\/.* /{print \$2}")

    if is_ipv6_address "$_srcaddr"; then

        _ipv6_flag="-6"

    fi

    if [[ -n $_ipaddr ]]; then

        _gateway=$(ip $_ipv6_flag route list dev "$_netdev" \

            | awk '/^default /{print $3}' | head -n 1)

        if [[ "x" != "x"$_ipv6_flag ]]; then

            # _ipaddr="2002::56ff:feb6:56d5/64", _netmask is the number after "/"

            _netmask=${_ipaddr#*\/}

            _srcaddr="[$_srcaddr]"

            _gateway="[$_gateway]"

        else

            _prefix=$(cut -d'/' -f2 <<< "$_ipaddr")

            if ! _netmask=$(cal_netmask_by_prefix "$_prefix" "$_ipv6_flag"); then

                derror "Failed to calculate netmask for $_ipaddr"

                exit 1

            fi

        fi

        echo -n "${_srcaddr}::${_gateway}:${_netmask}::"

    fi

    /sbin/ip $_ipv6_flag route show | grep -v default \

        | grep ".*via.* $_netdev " | grep -v "^[[:space:]]*nexthop" \

        | while read -r _route; do

            _target=$(echo "$_route" | awk '{print $1}')

            _nexthop=$(echo "$_route" | awk '{print $3}')

            if [[ "x" != "x"$_ipv6_flag ]]; then

                _target="[$_target]"

                _nexthop="[$_nexthop]"

            fi

            echo "rd.route=$_target:$_nexthop:$kdumpnic"

        done >> "${initdir}/etc/cmdline.d/45route-static.conf"

    kdump_handle_mulitpath_route "$_netdev" "$_srcaddr" "$kdumpnic"

}

kdump_handle_mulitpath_route() {

    local _netdev="$1" _srcaddr="$2" kdumpnic="$3" _ipv6_flag

    local _target _nexthop _route _weight _max_weight _rule

    if is_ipv6_address "$_srcaddr"; then

        _ipv6_flag="-6"

    fi

    while IFS="" read -r _route; do

        if [[ $_route =~ [[:space:]]+nexthop ]]; then

            _route=${_route##[[:space:]]}

            # Parse multipath route, using previous _target

            [[ $_target == 'default' ]] && continue

            [[ $_route =~ .*via.*\ $_netdev ]] || continue

            _weight=$(echo "$_route" | cut -d ' ' -f7)

            if [[ $_weight -gt $_max_weight ]]; then

                _nexthop=$(echo "$_route" | cut -d ' ' -f3)

                _max_weight=$_weight

                if [[ "x" != "x"$_ipv6_flag ]]; then

                    _rule="rd.route=[$_target]:[$_nexthop]:$kdumpnic"

                else

                    _rule="rd.route=$_target:$_nexthop:$kdumpnic"

                fi

            fi

        else

            [[ -n $_rule ]] && echo "$_rule"

            _target=$(echo "$_route" | cut -d ' ' -f1)

            _rule="" _max_weight=0 _weight=0

        fi

    done >> "${initdir}/etc/cmdline.d/45route-static.conf" \

        <<< "$(/sbin/ip $_ipv6_flag route show)"

    [[ -n $_rule ]] && echo "$_rule" >> "${initdir}/etc/cmdline.d/45route-static.conf"

}

kdump_get_mac_addr() {

    cat "/sys/class/net/$1/address"

}

#Bonding or team master modifies the mac address

#of its slaves, we should use perm address

kdump_get_perm_addr() {

    local addr

    addr=$(ethtool -P "$1" | sed -e 's/Permanent address: //')

    if [[ -z $addr ]] || [[ $addr == "00:00:00:00:00:00" ]]; then

        derror "Can't get the permanent address of $1"

    else

        echo "$addr"

    fi

}

# Prefix kernel assigned names with "kdump-". EX: eth0 -> kdump-eth0

# Because kernel assigned names are not persistent between 1st and 2nd

# kernel. We could probably end up with eth0 being eth1, eth0 being

# eth1, and naming conflict happens.

kdump_setup_ifname() {

    local _ifname

    # If ifname already has 'kdump-' prefix, we must be switching from

    # fadump to kdump. Skip prefixing 'kdump-' in this case as adding

    # another prefix may truncate the ifname. Since an ifname with

    # 'kdump-' is already persistent, this should be fine.

    if [[ $1 =~ eth* ]] && [[ ! $1 =~ ^kdump-* ]]; then

        _ifname="kdump-$1"

    else

        _ifname="$1"

    fi

    echo "$_ifname"

}

kdump_setup_bridge() {

    local _netdev=$1

    local _brif _dev _mac _kdumpdev

    for _dev in "/sys/class/net/$_netdev/brif/"*; do

        [[ -e $_dev ]] || continue

        _dev=${_dev##*/}

        _kdumpdev=$_dev

        if kdump_is_bond "$_dev"; then

            (kdump_setup_bond "$_dev" "$(get_nmcli_connection_apath_by_ifname "$_dev")") || exit 1

        elif kdump_is_team "$_dev"; then

            kdump_setup_team "$_dev"

        elif kdump_is_vlan "$_dev"; then

            kdump_setup_vlan "$_dev"

        else

            _mac=$(kdump_get_mac_addr "$_dev")

            _kdumpdev=$(kdump_setup_ifname "$_dev")

            echo -n " ifname=$_kdumpdev:$_mac" >> "${initdir}/etc/cmdline.d/41bridge.conf"

        fi

        _brif+="$_kdumpdev,"

    done

    echo " bridge=$_netdev:${_brif%,}" >> "${initdir}/etc/cmdline.d/41bridge.conf"

}

# drauct takes bond=<bondname>[:<bondslaves>:[:<options>]] syntax to parse

#    bond. For example:

#     bond=bond0:eth0,eth1:mode=balance-rr

kdump_setup_bond() {

    local _netdev="$1"

    local _conpath="$2"

    local _dev _mac _slaves _kdumpdev _bondoptions

    for _dev in $(cat "/sys/class/net/$_netdev/bonding/slaves"); do

        _mac=$(kdump_get_perm_addr "$_dev")

        _kdumpdev=$(kdump_setup_ifname "$_dev")

        echo -n " ifname=$_kdumpdev:$_mac" >> "${initdir}/etc/cmdline.d/42bond.conf"

        _slaves+="$_kdumpdev,"

    done

    echo -n " bond=$_netdev:${_slaves%,}" >> "${initdir}/etc/cmdline.d/42bond.conf"

    _bondoptions=$(get_nmcli_field_by_conpath "bond.options" "$_conpath")

    if [[ -z $_bondoptions ]]; then

        dwarning "Failed to get bond configuration via nmlci output. Now try sourcing ifcfg script."

        source_ifcfg_file "$_netdev"

        _bondoptions="$(echo "$BONDING_OPTS" | xargs echo | tr " " ",")"

    fi

    if [[ -z $_bondoptions ]]; then

        derror "Get empty bond options"

        exit 1

    fi

    echo ":$_bondoptions" >> "${initdir}/etc/cmdline.d/42bond.conf"

}

kdump_setup_team() {

    local _netdev=$1

    local _dev _mac _slaves _kdumpdev

    for _dev in $(teamnl "$_netdev" ports | awk -F':' '{print $2}'); do

        _mac=$(kdump_get_perm_addr "$_dev")

        _kdumpdev=$(kdump_setup_ifname "$_dev")

        echo -n " ifname=$_kdumpdev:$_mac" >> "${initdir}/etc/cmdline.d/44team.conf"

        _slaves+="$_kdumpdev,"

    done

    echo " team=$_netdev:${_slaves%,}" >> "${initdir}/etc/cmdline.d/44team.conf"

    #Buggy version teamdctl outputs to stderr!

    #Try to use the latest version of teamd.

    if ! teamdctl "$_netdev" config dump > "${initdir}/tmp/$$-$_netdev.conf"; then

        derror "teamdctl failed."

        exit 1

    fi

    inst_dir /etc/teamd

    inst_simple "${initdir}/tmp/$$-$_netdev.conf" "/etc/teamd/$_netdev.conf"

    rm -f "${initdir}/tmp/$$-$_netdev.conf"

}

kdump_setup_vlan() {

    local _netdev=$1

    local _phydev

    local _netmac

    local _kdumpdev

    _phydev="$(awk '/^Device:/{print $2}' /proc/net/vlan/"$_netdev")"

    _netmac="$(kdump_get_mac_addr "$_phydev")"

    #Just support vlan over bond and team

    if kdump_is_bridge "$_phydev"; then

        derror "Vlan over bridge is not supported!"

        exit 1

    elif kdump_is_bond "$_phydev"; then

        (kdump_setup_bond "$_phydev" "$(get_nmcli_connection_apath_by_ifname "$_phydev")") || exit 1

        echo " vlan=$(kdump_setup_ifname "$_netdev"):$_phydev" > "${initdir}/etc/cmdline.d/43vlan.conf"

    else

        _kdumpdev="$(kdump_setup_ifname "$_phydev")"

        echo " vlan=$(kdump_setup_ifname "$_netdev"):$_kdumpdev ifname=$_kdumpdev:$_netmac" > "${initdir}/etc/cmdline.d/43vlan.conf"

    fi

}

# find online znet device

# return ifname (_netdev)

# code reaped from the list_configured function of

# https://github.com/hreinecke/s390-tools/blob/master/zconf/znetconf

find_online_znet_device() {

    local CCWGROUPBUS_DEVICEDIR="/sys/bus/ccwgroup/devices"

    local NETWORK_DEVICES d ifname ONLINE

    [[ ! -d $CCWGROUPBUS_DEVICEDIR ]] && return

    NETWORK_DEVICES=$(find $CCWGROUPBUS_DEVICEDIR)

    for d in $NETWORK_DEVICES; do

        [[ ! -f "$d/online" ]] && continue

        read -r ONLINE < "$d/online"

        if [[ $ONLINE -ne 1 ]]; then

            continue

        fi

        # determine interface name, if there (only for qeth and if

        # device is online)

        if [[ -f $d/if_name ]]; then

            read -r ifname < "$d/if_name"

        elif [[ -d $d/net ]]; then

            ifname=$(ls "$d/net/")

        fi

        [[ -n $ifname ]] && break

    done

    echo -n "$ifname"

}

# setup s390 znet cmdline

# $1: netdev (ifname)

# $2: nmcli connection path

kdump_setup_znet() {

    local _netdev="$1"

    local _conpath="$2"

    local s390_prefix="802-3-ethernet.s390-"

    local _options=""

    local NETTYPE

    local SUBCHANNELS

    NETTYPE=$(get_nmcli_field_by_conpath "${s390_prefix}nettype" "$_conpath")

    SUBCHANNELS=$(get_nmcli_field_by_conpath "${s390_prefix}subchannels" "$_conpath")

    _options=$(get_nmcli_field_by_conpath "${s390_prefix}options" "$_conpath")

    if [[ -z $NETTYPE || -z $SUBCHANNELS || -z $_options ]]; then

        dwarning "Failed to get znet configuration via nmlci output. Now try sourcing ifcfg script."

        source_ifcfg_file "$_netdev"

        for i in $OPTIONS; do

            _options=${_options},$i

        done

    fi

    if [[ -z $NETTYPE || -z $SUBCHANNELS || -z $_options ]]; then

        exit 1

    fi

    echo "rd.znet=${NETTYPE},${SUBCHANNELS},${_options} rd.znet_ifname=$_netdev:${SUBCHANNELS}" > "${initdir}/etc/cmdline.d/30znet.conf"

}

kdump_get_ip_route() {

    local _route

    if ! _route=$(/sbin/ip -o route get to "$1" 2>&1;; then

        derror "Bad kdump network destination: $1"

        exit 1

    fi

    echo "$_route"

}

kdump_get_ip_route_field() {

    echo "$1" | sed -n -e "s/^.*\<$2\>\s\+\(\S\+\).*$/\1/p"

}

kdump_get_remote_ip() {

    local _remote _remote_temp

    _remote=$(get_remote_host "$1")

    if is_hostname "$_remote"; then

        _remote_temp=$(getent ahosts "$_remote" | grep -v : | head -n 1)

        if [[ -z $_remote_temp ]]; then

            _remote_temp=$(getent ahosts "$_remote" | head -n 1)

        fi

        _remote=$(echo "$_remote_temp" | awk '{print $1}')

    fi

    echo "$_remote"

}

# Setup dracut to bring up network interface that enable

# initramfs accessing giving destination

# $1: destination host

kdump_install_net() {

    local _destaddr _srcaddr _route _netdev _conpath kdumpnic

    local _static _proto _ip_conf _ip_opts _ifname_opts

    local _znet_netdev _znet_conpath

    _destaddr=$(kdump_get_remote_ip "$1")

    _route=$(kdump_get_ip_route "$_destaddr")

    _srcaddr=$(kdump_get_ip_route_field "$_route" "src")

    _netdev=$(kdump_get_ip_route_field "$_route" "dev")

    _conpath=$(get_nmcli_connection_apath_by_ifname "$_netdev")

    _netmac=$(kdump_get_mac_addr "$_netdev")

    kdumpnic=$(kdump_setup_ifname "$_netdev")

    _znet_netdev=$(find_online_znet_device)

    if [[ -n $_znet_netdev ]]; then

        _znet_conpath=$(get_nmcli_connection_apath_by_ifname "$_znet_netdev")

        if ! (kdump_setup_znet "$_znet_netdev" "$_znet_conpath"); then

            derror "Failed to set up znet"

            exit 1

        fi

    fi

    _static=$(kdump_static_ip "$_netdev" "$_srcaddr" "$kdumpnic")

    if [[ -n $_static ]]; then

        _proto=none

    elif is_ipv6_address "$_srcaddr"; then

        _proto=auto6

    else

        _proto=dhcp

    fi

    _ip_conf="${initdir}/etc/cmdline.d/40ip.conf"

    _ip_opts=" ip=${_static}$kdumpnic:${_proto}"

    # dracut doesn't allow duplicated configuration for same NIC, even they're exactly the same.

    # so we have to avoid adding duplicates

    # We should also check /proc/cmdline for existing ip=xx arg.

    # For example, iscsi boot will specify ip=xxx arg in cmdline.

    if [[ ! -f $_ip_conf ]] || ! grep -q "$_ip_opts" "$_ip_conf" \

        && ! grep -q "ip=[^[:space:]]*$_netdev" /proc/cmdline; then

        echo "$_ip_opts" >> "$_ip_conf"

    fi

    if kdump_is_bridge "$_netdev"; then

        kdump_setup_bridge "$_netdev"

    elif kdump_is_bond "$_netdev"; then

        (kdump_setup_bond "$_netdev" "$_conpath") || exit 1

    elif kdump_is_team "$_netdev"; then

        kdump_setup_team "$_netdev"

    elif kdump_is_vlan "$_netdev"; then

        kdump_setup_vlan "$_netdev"

    else

        _ifname_opts=" ifname=$kdumpnic:$_netmac"

        echo "$_ifname_opts" >> "$_ip_conf"

    fi

    kdump_setup_dns "$_netdev" "$_conpath"

    if [[ ! -f ${initdir}/etc/cmdline.d/50neednet.conf ]]; then

        # network-manager module needs this parameter

        echo "rd.neednet" >> "${initdir}/etc/cmdline.d/50neednet.conf"

    fi

    # Save netdev used for kdump as cmdline

    # Whoever calling kdump_install_net() is setting up the default gateway,

    # ie. bootdev/kdumpnic. So don't override the setting if calling

    # kdump_install_net() for another time. For example, after setting eth0 as

    # the default gate way for network dump, eth1 in the fence kdump path will

    # call kdump_install_net again and we don't want eth1 to be the default

    # gateway.

    if [[ ! -f ${initdir}/etc/cmdline.d/60kdumpnic.conf ]] \

        && [[ ! -f ${initdir}/etc/cmdline.d/70bootdev.conf ]]; then

        echo "kdumpnic=$kdumpnic" > "${initdir}/etc/cmdline.d/60kdumpnic.conf"

        echo "bootdev=$kdumpnic" > "${initdir}/etc/cmdline.d/70bootdev.conf"

    fi

}

# install etc/kdump/pre.d and /etc/kdump/post.d

kdump_install_pre_post_conf() {

    if [[ -d /etc/kdump/pre.d ]]; then

        for file in /etc/kdump/pre.d/*; do

            if [[ -x $file ]]; then

                dracut_install "$file"

            elif [[ $file != "/etc/kdump/pre.d/*" ]]; then

                echo "$file is not executable"

            fi

        done

    fi

    if [[ -d /etc/kdump/post.d ]]; then

        for file in /etc/kdump/post.d/*; do

            if [[ -x $file ]]; then

                dracut_install "$file"

            elif [[ $file != "/etc/kdump/post.d/*" ]]; then

                echo "$file is not executable"

            fi

        done

    fi

}

default_dump_target_install_conf() {

    local _target _fstype

    local _mntpoint _save_path

    is_user_configured_dump_target && return

    _save_path=$(get_bind_mount_source "$(get_save_path)")

    _target=$(get_target_from_path "$_save_path")

    _mntpoint=$(get_mntpoint_from_target "$_target")

    _fstype=$(get_fs_type_from_target "$_target")

    if is_fs_type_nfs "$_fstype"; then

        kdump_install_net "$_target"

        _fstype="nfs"

    else

        _target=$(kdump_get_persistent_dev "$_target")

    fi

    echo "$_fstype $_target" >> "${initdir}/tmp/$$-kdump.conf"

    # don't touch the path under root mount

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

        _save_path=${_save_path##"$_mntpoint"}

    fi

    #erase the old path line, then insert the parsed path

    sed -i "/^path/d" "${initdir}/tmp/$$-kdump.conf"

    echo "path $_save_path" >> "${initdir}/tmp/$$-kdump.conf"

}

#install kdump.conf and what user specifies in kdump.conf

kdump_install_conf() {

    local _opt _val _pdev

    kdump_read_conf > "${initdir}/tmp/$$-kdump.conf"

    while read -r _opt _val; do

        # remove inline comments after the end of a directive.

        case "$_opt" in

            raw)

                _pdev=$(persistent_policy="by-id" kdump_get_persistent_dev "$_val")

                sed -i -e "s#^${_opt}[[:space:]]\+$_val#$_opt $_pdev#" "${initdir}/tmp/$$-kdump.conf"

                ;;

            ext[234] | xfs | btrfs | minix)

                _pdev=$(kdump_get_persistent_dev "$_val")

                sed -i -e "s#^${_opt}[[:space:]]\+$_val#$_opt $_pdev#" "${initdir}/tmp/$$-kdump.conf"

                ;;

            ssh | nfs)

                kdump_install_net "$_val"

                ;;

            dracut_args)

                if [[ $(get_dracut_args_fstype "$_val") == nfs* ]]; then

                    kdump_install_net "$(get_dracut_args_target "$_val")"

                fi

                ;;

            kdump_pre | kdump_post | extra_bins)

                # shellcheck disable=SC2086

                dracut_install $_val

                ;;

            core_collector)

                dracut_install "${_val%%[[:blank:]]*}"

                ;;

        esac

    done <<< "$(kdump_read_conf)"

    kdump_install_pre_post_conf

    default_dump_target_install_conf

    kdump_configure_fence_kdump "${initdir}/tmp/$$-kdump.conf"

    inst "${initdir}/tmp/$$-kdump.conf" "/etc/kdump.conf"

    rm -f "${initdir}/tmp/$$-kdump.conf"

}

# Default sysctl parameters should suffice for kdump kernel.

# Remove custom configurations sysctl.conf & sysctl.d/*

remove_sysctl_conf() {

    # As custom configurations like vm.min_free_kbytes can lead

    # to OOM issues in kdump kernel, avoid them

    rm -f "${initdir}/etc/sysctl.conf"

    rm -rf "${initdir}/etc/sysctl.d"

    rm -rf "${initdir}/run/sysctl.d"

    rm -rf "${initdir}/usr/lib/sysctl.d"

}

kdump_iscsi_get_rec_val() {