#!/bin/bash

_DRACUT_KDUMP_NM_TMP_DIR="$DRACUT_TMPDIR/$$-DRACUT_KDUMP_NM"

_save_kdump_netifs() {

    unique_netifs[$1]=1

}

_get_kdump_netifs() {

    echo -n "${!unique_netifs[@]}"

}

kdump_module_init() {

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

        mkdir -p "${initdir}/tmp"

    fi

    mkdir -p "$_DRACUT_KDUMP_NM_TMP_DIR"

    . /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 is_lvm2_thinp_dump_target; then

        if grep -q lvmthinpool-monitor <<< $(dracut --list-modules); then

            add_opt_module lvmthinpool-monitor

        else

            dwarning "Required lvmthinpool-monitor modules is missing! Please upgrade dracut >= 057."

        fi

    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

}

# $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

}

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

}

apply_nm_initrd_generator_timeouts() {

    local _timeout_conf

    _timeout_conf=$_DRACUT_KDUMP_NM_TMP_DIR/timeout_conf

    cat << EOF > "$_timeout_conf"

[device-95-kdump]

carrier-wait-timeout=30000

[connection-95-kdump]

ipv4.dhcp-timeout=90

ipv6.dhcp-timeout=90

EOF

    inst "$_timeout_conf" "/etc/NetworkManager/conf.d/95-kdump-timeouts.conf"

}

use_ipv4_or_ipv6() {

    local _netif=$1 _uuid=$2

    if [[ -v "ipv4_usage[$_netif]" ]]; then

        nmcli connection modify --temporary "$_uuid" ipv4.may-fail no &> >(ddebug)

    fi

    if [[ -v "ipv6_usage[$_netif]" ]]; then

        nmcli connection modify --temporary "$_uuid" ipv6.may-fail no &> >(ddebug)

    fi

    if [[ -v "ipv4_usage[$_netif]" ]] && [[ ! -v "ipv6_usage[$_netif]" ]]; then

        nmcli connection modify --temporary "$_uuid" ipv6.method disabled &> >(ddebug)

    elif [[ ! -v "ipv4_usage[$_netif]" ]] && [[ -v "ipv6_usage[$_netif]" ]]; then

        nmcli connection modify --temporary "$_uuid" ipv4.method disabled &> >(ddebug)

    fi

}

_clone_nmconnection() {

    local _clone_output _name _unique_id

    _unique_id=$1

    _name=$(nmcli --get-values connection.id connection show "$_unique_id")

    if _clone_output=$(nmcli connection clone --temporary uuid "$_unique_id" "$_name"); then

        sed -E -n "s/.* \(.*\) cloned as.*\((.*)\)\.$/\1/p" <<< "$_clone_output"

        return 0

    fi

    return 1

}

_match_nmconnection_by_mac() {

    local _unique_id _dev _mac _mac_field

    _unique_id=$1

    _dev=$2

    _mac=$(kdump_get_perm_addr "$_dev")

    [[ $_mac != 'not set' ]] || return

    _mac_field=$(nmcli --get-values connection.type connection show "$_unique_id").mac-address

    nmcli connection modify --temporary "$_unique_id" "$_mac_field" "$_mac" &> >(ddebug)

    nmcli connection modify --temporary "$_unique_id" "connection.interface-name" "" &> >(ddebug)

}

# Clone and modify NM connection profiles

#

# This function makes use of "nmcli clone" to automatically convert ifcfg-*

# files to Networkmanager .nmconnection connection profiles and also modify the

# properties of .nmconnection if necessary.

clone_and_modify_nmconnection() {

    local _dev _cloned_nmconnection_file_path _tmp_nmconnection_file_path _old_uuid _uuid

    _dev=$1

    _nmconnection_file_path=$2

    _old_uuid=$(nmcli --get-values connection.uuid connection show filename "$_nmconnection_file_path")

    if ! _uuid=$(_clone_nmconnection "$_old_uuid"); then

        derror "Failed to clone $_old_uuid"

        exit 1

    fi

    use_ipv4_or_ipv6 "$_dev" "$_uuid"

    nmcli connection modify --temporary uuid "$_uuid" connection.wait-device-timeout 60000 &> >(ddebug)

    # For physical NIC i.e. non-user created NIC, ask NM to match a

    # connection profile based on MAC address

    _match_nmconnection_by_mac "$_uuid" "$_dev"

    # If a value contain ":", nmcli by default escape it with "\:" because it

    # also uses ":" as the delimiter to separate values. In our case, escaping is not needed.

    _cloned_nmconnection_file_path=$(nmcli --escape no --get-values UUID,FILENAME connection show | sed -n "s/^${_uuid}://p")

    _tmp_nmconnection_file_path=$_DRACUT_KDUMP_NM_TMP_DIR/$(basename "$_nmconnection_file_path")

    cp "$_cloned_nmconnection_file_path" "$_tmp_nmconnection_file_path"

    # change uuid back to old value in case it's refered by other connection

    # profile e.g. connection.master could be interface name of the master

    # device or UUID of the master connection.

    sed -i -E "s/(^uuid=).*$/\1${_old_uuid}/g" "$_tmp_nmconnection_file_path"

    nmcli connection del "$_uuid" &> >(ddebug)

    echo -n "$_tmp_nmconnection_file_path"

}

_install_nmconnection() {

    local _src _nmconnection_name _dst

    _src=$1

    _nmconnection_name=$(basename "$_src")

    _dst="/etc/NetworkManager/system-connections/$_nmconnection_name"

    inst "$_src" "$_dst"

}

kdump_install_nmconnections() {

    local _netif _nm_conn_path _cloned_nm_path

    while IFS=: read -r _netif _nm_conn_path; do

        [[ -v "unique_netifs[$_netif]" ]] || continue

        if _cloned_nm_path=$(clone_and_modify_nmconnection "$_netif" "$_nm_conn_path"); then

            _install_nmconnection "$_cloned_nm_path"

        else

            derror "Failed to install the .nmconnection for $_netif"

            exit 1

        fi

    done <<< "$(nmcli -t -f device,filename connection show --active)"

    # Stop dracut 35network-manger to calling nm-initrd-generator.

    # Note this line of code can be removed after NetworkManager >= 1.35.2

    # gets released.

    echo > "${initdir}/usr/libexec/nm-initrd-generator"

}

kdump_install_nm_netif_allowlist() {

    local _netif _except_netif _netif_allowlist _netif_allowlist_nm_conf

    for _netif in $1; do

        _per_mac=$(kdump_get_perm_addr "$_netif")

        if [[ "$_per_mac" != 'not set' ]]; then

            _except_netif="mac:$_per_mac"

        else

            _except_netif="interface-name:$_netif"

        fi

        _netif_allowlist="${_netif_allowlist}except:${_except_netif};"

    done

    _netif_allowlist_nm_conf=$_DRACUT_KDUMP_NM_TMP_DIR/netif_allowlist_nm_conf

    cat << EOF > "$_netif_allowlist_nm_conf"

[device-others]

match-device=${_netif_allowlist}

managed=false

EOF

    inst "$_netif_allowlist_nm_conf" "/etc/NetworkManager/conf.d/10-kdump-netif_allowlist.conf"

}

_get_nic_driver() {

    ethtool -i "$1" | sed -n -E "s/driver: (.*)/\1/p"

}

_get_hpyerv_physical_driver() {

    local _physical_nic

    _physical_nic=$(find /sys/class/net/"$1"/ -name 'lower_*' | sed -En "s/\/.*lower_(.*)/\1/p")

    [[ -n $_physical_nic ]] || return

    _get_nic_driver "$_physical_nic"

}

_get_physical_function_driver() {

    local _physfn_dir=/sys/class/net/"$1"/device/physfn

    if [[ -e "$_physfn_dir" ]]; then

        basename "$(readlink -f "$_physfn_dir"/driver)"

    fi

}

kdump_install_nic_driver() {

    local _netif _driver _drivers

    _drivers=('=drivers/net/phy' '=drivers/net/mdio')

    for _netif in $1; do

        [[ $_netif == lo ]] && continue

        _driver=$(_get_nic_driver "$_netif")

        if [[ -z $_driver ]]; then

            derror "Failed to get the driver of $_netif"

            exit 1

        fi

        if [[ $_driver == "802.1Q VLAN Support" ]]; then

            # ethtool somehow doesn't return the driver name for a VLAN NIC

            _driver=8021q

        elif [[ $_driver == "team" ]]; then

            # install the team mode drivers like team_mode_roundrobin.ko as well

            _driver='=drivers/net/team'

        elif [[ $_driver == "hv_netvsc" ]]; then

            # A Hyper-V VM may have accelerated networking

            # https://learn.microsoft.com/en-us/azure/virtual-network/accelerated-networking-overview

            # Install the driver of physical NIC as well

            _drivers+=("$(_get_hpyerv_physical_driver "$_netif")")

        fi

        _drivers+=("$_driver")

        # For a Single Root I/O Virtualization (SR-IOV) virtual device,

        # the driver of physical device needs to be installed as well

        _drivers+=("$(_get_physical_function_driver "$_netif")")

    done

    [[ -n ${_drivers[*]} ]] || return

    instmods "${_drivers[@]}"

}

kdump_setup_bridge() {

    local _netdev=$1

    local _dev

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

        [[ -e $_dev ]] || continue

        _dev=${_dev##*/}

        if kdump_is_bond "$_dev"; then

            kdump_setup_bond "$_dev" || return 1

        elif kdump_is_team "$_dev"; then

            kdump_setup_team "$_dev"

        elif kdump_is_vlan "$_dev"; then

            kdump_setup_vlan "$_dev"

        fi

        _save_kdump_netifs "$_dev"

    done

}

kdump_setup_bond() {

    local _netdev="$1"

    local _dev

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

        _save_kdump_netifs "$_dev"

    done

}

kdump_setup_team() {

    local _netdev=$1

    local _dev

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

        _save_kdump_netifs "$_dev"

    done

}

kdump_setup_vlan() {

    local _netdev=$1

    local _parent_netif

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

    #Just support vlan over bond and team

    if kdump_is_bridge "$_parent_netif"; then

        derror "Vlan over bridge is not supported!"

        exit 1

    elif kdump_is_bond "$_parent_netif"; then

        kdump_setup_bond "$_parent_netif" || return 1

    elif kdump_is_team "$_parent_netif"; then

        kdump_setup_team "$_parent_netif" || return 1

    fi

    _save_kdump_netifs "$_parent_netif"

}

_find_znet_nmconnection() {

    LANG=C grep -s -E -i -l \

        "^s390-subchannels=([0-9]\.[0-9]\.[a-f0-9]+;){0,2}" \

        "$1"/*.nmconnection | LC_ALL=C sed -e "$2"

}

kdump_setup_ovs() {

    local _netdev="$1"

    local _dev _phy_if

    _phy_if=$(ovs_find_phy_if "$_netdev")

    if kdump_is_bridge "$_phy_if"; then

        kdump_setup_vlan "$_phy_if"

    elif kdump_is_bond "$_phy_if"; then

        kdump_setup_bond "$_phy_if" || return 1

    elif kdump_is_team "$_phy_if"; then

        derror "Ovs bridge over team is not supported!"

        exit 1

    fi

    _save_kdump_netifs "$_phy_if"

}

# setup s390 znet

#

# Note part of code is extracted from ccw_init provided by s390utils

kdump_setup_znet() {

    local _config_file _unique_name _NM_conf_dir

    local __sed_discard_ignored_files='/\(~\|\.bak\|\.old\|\.orig\|\.rpmnew\|\.rpmorig\|\.rpmsave\)$/d'

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

        return

    fi

    _NM_conf_dir="/etc/NetworkManager/system-connections"

    _config_file=$(_find_znet_nmconnection "$initdir/$_NM_conf_dir" "$__sed_discard_ignored_files")

    if [[ -n "$_config_file" ]]; then

        ddebug "$_config_file has already contained the znet config"

        return

    fi

    _config_file=$(LANG=C grep -s -E -i -l \

        "^[[:space:]]*SUBCHANNELS=['\"]?([0-9]\.[0-9]\.[a-f0-9]+,){0,2}" \

        /etc/sysconfig/network-scripts/ifcfg-* \

        | LC_ALL=C sed -e "$__sed_discard_ignored_files")

    if [[ -z "$_config_file" ]]; then

        _config_file=$(_find_znet_nmconnection "$_NM_conf_dir" "$__sed_discard_ignored_files")

    fi

    if [[ -n "$_config_file" ]]; then

        _unique_name=$(cat /proc/sys/kernel/random/uuid)

        nmcli connection clone --temporary "$_config_file" "$_unique_name" &> >(ddebug)

        nmcli connection modify --temporary "$_unique_name" connection.autoconnect false

        inst "/run/NetworkManager/system-connections/${_unique_name}.nmconnection" "${_NM_conf_dir}/${_unique_name}.nmconnection"

        nmcli connection del "$_unique_name" &> >(ddebug)

    fi

}

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"

}

# Find the physical interface of Open vSwitch (Ovs) bridge

#

# The physical network interface has the same MAC address as the Ovs bridge

ovs_find_phy_if() {

    local _mac _dev

    _mac=$(kdump_get_mac_addr $1)

    for _dev in $(ovs-vsctl list-ifaces $1); do

        if [[ $_mac == $(

            echo -n "$_dev"

            return

        fi

    done

    return 1

}

# Tell if a network interface is an Open vSwitch (Ovs) bridge

kdump_is_ovs_bridge() {

    [[ $(_get_nic_driver $1) == openvswitch ]]

}

# Collect netifs needed by kdump

# $1: destination host

kdump_collect_netif_usage() {

    local _destaddr _srcaddr _route _netdev

    _destaddr=$(kdump_get_remote_ip "$1")

    if ! _route=$(kdump_get_ip_route "$_destaddr"); then

        derror "Bad kdump network destination: $_destaddr"

        exit 1

    fi

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

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

    if kdump_is_bridge "$_netdev"; then

        kdump_setup_bridge "$_netdev"

    elif kdump_is_bond "$_netdev"; then

        kdump_setup_bond "$_netdev" || return 1

    elif kdump_is_team "$_netdev"; then

        kdump_setup_team "$_netdev"

    elif kdump_is_vlan "$_netdev"; then

        kdump_setup_vlan "$_netdev"

    elif kdump_is_ovs_bridge "$_netdev"; then

        has_ovs_bridge=yes

        kdump_setup_ovs "$_netdev"

    fi

    _save_kdump_netifs "$_netdev"

    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

    if [[ ! -f ${initdir}/etc/cmdline.d/60kdumpip.conf ]]; then

        echo "kdump_remote_ip=$_destaddr" > "${initdir}/etc/cmdline.d/60kdumpip.conf"

    fi

    if is_ipv6_address "$_srcaddr"; then

        ipv6_usage[$_netdev]=1

    else

        ipv4_usage[$_netdev]=1

    fi

}

kdump_install_resolv_conf() {

    local _resolv_conf=/etc/resolv.conf _nm_conf_dir=/etc/NetworkManager/conf.d

    # Some users may choose to manage /etc/resolve.conf manually [1]

    # by setting dns=none or use a symbolic link resolve.conf [2].

    # So resolve.conf should be installed to kdump initrd as well. To prevent

    # NM frome overwritting the user-configured resolve.conf in kdump initrd,

    # also set dns=none for NM.

    #

    # Note:

    # 1. When resolv.conf is managed by systemd-resolved.service, it could also be a

    #    symbolic link. So exclude this case by teling if systemd-resolved is enabled.

    #

    # 2. It's harmless to blindly copy /etc/resolve.conf to the initrd because

    #    by default in initramfs this file will be overwritten by

    #    NetworkManager. If user manages it via a symbolic link, it's still

    #    preserved because NM won't touch a symbolic link file.

    #

    # [1] https://bugzilla.gnome.org/show_bug.cgi?id=690404

    # [2] https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/8/html/configuring_and_managing_networking/manually-configuring-the-etc-resolv-conf-file_configuring-and-managing-networking

    systemctl -q is-enabled systemd-resolved 2> /dev/null && return 0

    inst "$_resolv_conf"

    if NetworkManager --print-config | grep -qs "^dns=none"; then

        printf "[main]\ndns=none\n" > "${initdir}/${_nm_conf_dir}"/90-dns-none.conf

    fi

}

kdump_install_ovs_deps() {

    [[ $has_ovs_bridge == yes ]] || return 0

    inst_multiple -o $(rpm -ql NetworkManager-ovs) $(rpm -ql $(rpm -qf /usr/lib/systemd/system/openvswitch.service)) /sbin/sysctl /usr/bin/uuidgen /usr/bin/hostname /usr/bin/touch /usr/bin/expr /usr/bin/id /usr/bin/install /usr/bin/setpriv /usr/bin/nice /usr/bin/df

    # 1. Overwrite the copied /etc/sysconfig/openvswitch so

    # ovsdb-server.service can run as the default user root.

    # /etc/sysconfig/openvswitch by default intructs ovsdb-server.service to

    # run as USER=openvswitch, However openvswitch doesn't have the permission

    # to write to /tmp in kdump initrd and ovsdb-server.servie will fail

    # with the error "ovs-ctl[1190]: ovsdb-server: failed to create temporary

    # file (Permission denied)". So run ovsdb-server.service as root instead

    #

    # 2. Bypass the error "referential integrity violation: Table Port column

    # interfaces row" caused by we changing the connection profiles

    echo "OPTIONS=\"--ovsdb-server-options='--disable-file-column-diff'\"" >"${initdir}/etc/sysconfig/openvswitch"

    KDUMP_DROP_IN_DIR="${initdir}/etc/systemd/system/nm-initrd.service.d"

    mkdir -p "$KDUMP_DROP_IN_DIR"

    printf "[Unit]\nAfter=openvswitch.service\n" >$KDUMP_DROP_IN_DIR/01-after-ovs.conf

    $SYSTEMCTL -q --root "$initdir" enable openvswitch.service

    $SYSTEMCTL -q --root "$initdir" add-wants basic.target openvswitch.service

}

# Setup dracut to bring up network interface that enable

# initramfs accessing giving destination

kdump_install_net() {

    local _netifs

    _netifs=$(_get_kdump_netifs)

    if [[ -n "$_netifs" ]]; then

        kdump_install_nmconnections

        apply_nm_initrd_generator_timeouts

        kdump_setup_znet

        kdump_install_nm_netif_allowlist "$_netifs"

        kdump_install_nic_driver "$_netifs"

        kdump_install_resolv_conf

        kdump_install_ovs_deps

    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_collect_netif_usage "$_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 | virtiofs)

                _pdev=$(kdump_get_persistent_dev "$_val")

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

                ;;

            ssh | nfs)

                kdump_collect_netif_usage "$_val"

                ;;

            dracut_args)

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

                    kdump_collect_netif_usage "$(get_dracut_args_target "$_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() {

    local result

    # The open-iscsi 742 release changed to using flat files in

    # /var/lib/iscsi.

    result=$(/sbin/iscsiadm --show -m session -r "$1" | grep "^${2} = ")

    result=${result##* = }

    echo "$result"

}

kdump_get_iscsi_initiator() {

    local _initiator

    local initiator_conf="/etc/iscsi/initiatorname.iscsi"

    [[ -f $initiator_conf ]] || return 1

    while read -r _initiator; do

        [[ -z ${_initiator%%#*} ]] && continue # Skip comment lines

        case $_initiator in

            InitiatorName=*)

                initiator=${_initiator#InitiatorName=}

                echo "rd.iscsi.initiator=${initiator}"

                return 0

                ;;

            *) ;;

        esac

    done < ${initiator_conf}

    return 1

}

# Figure out iBFT session according to session type

is_ibft() {

    [[ "$(kdump_iscsi_get_rec_val "$1" "node.discovery_type")" == fw ]]

}

kdump_setup_iscsi_device() {

    local path=$1

    local tgt_name

    local tgt_ipaddr

    local username

    local password