#!/bin/bash

. $dracutfunctions

. /lib/kdump/kdump-lib.sh

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

    mkdir -p "${initdir}/tmp"

fi

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"

    add_opt_module() {

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

    }

    if is_squash_available && ! is_fadump_capable; 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 "$( find /sys/devices -name drm )" ] || [ -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

    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: netdev name

kdump_setup_dns() {

    local _nameserver _dns

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

    source_ifcfg_file $1

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

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

    while read content;

    do

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

        [ -z "$_nameserver" ] && continue

        _dns=$(echo $_nameserver | cut -d' ' -f2)

        [ -z "$_dns" ] && continue

        if [ ! -f $_dnsfile ] || [ ! $(cat $_dnsfile | grep -q $_dns) ]; then

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

        fi

    done < "/etc/resolv.conf"

}

#$1: netdev name

#$2: srcaddr

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

kdump_static_ip() {

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

    local _netmask _gateway _ipaddr _target _nexthop

    _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

            _netmask=$(ipcalc -m $_ipaddr | cut -d'=' -f2)

        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 _route; do

        _target=`echo $_route | cut -d ' ' -f1`

        _nexthop=`echo $_route | cut -d ' ' -f3`

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

            _target="[$_target]"

            _nexthop="[$_nexthop]"

        fi

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

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

    kdump_handle_mulitpath_route $_netdev $_srcaddr

}

kdump_handle_mulitpath_route() {

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

    local _target _nexthop _route _weight _max_weight _rule

    if is_ipv6_address $_srcaddr; then

        _ipv6_flag="-6"

    fi

    while IFS="" read _route; do

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

            _route=$(echo "$_route" | sed -e 's/^[[: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]:$_netdev"

                else

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

                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=$(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 `ls /sys/class/net/$_netdev/brif/`; do

        _kdumpdev=$_dev

        if kdump_is_bond "$_dev"; then

            kdump_setup_bond "$_dev"

        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=$_netdev:$(echo $_brif | sed -e 's/,$//')" >> ${initdir}/etc/cmdline.d/41bridge.conf

}

kdump_setup_bond() {

    local _netdev=$1

    local _dev _mac _slaves _kdumpdev

    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=$_netdev:$(echo $_slaves | sed 's/,$//')" >> ${initdir}/etc/cmdline.d/42bond.conf

    # Get bond options specified in ifcfg

    source_ifcfg_file $_netdev

    bondoptions=":$(echo $BONDING_OPTS | xargs echo | tr " " ",")"

    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=$_netdev:$(echo $_slaves | sed -e 's/,$//')" >> ${initdir}/etc/cmdline.d/44team.conf

    #Buggy version teamdctl outputs to stderr!

    #Try to use the latest version of teamd.

    teamdctl "$_netdev" config dump > ${initdir}/tmp/$$-$_netdev.conf

    if [ $? -ne 0 ]

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

    local _netmac="$(kdump_get_mac_addr $_phydev)"

    local _kdumpdev

    #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"

        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

}

# setup s390 znet cmdline

# $1: netdev name

kdump_setup_znet() {

    local _options=""

    local _netdev=$1

    source_ifcfg_file $_netdev

    for i in $OPTIONS; do

        _options=${_options},$i

    done

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

}

kdump_get_ip_route()

{

    local _route=$(/sbin/ip -o route get to $1 2>&1)

    [ $? != 0 ] && die "Bad kdump network destination: $1"

    echo $_route

}

kdump_get_ip_route_field()

{

    if `echo $1 | grep -q $2`; then

        echo ${1##*$2} | cut -d ' ' -f1

    fi

}

kdump_get_remote_ip()

{

    local _remote=$(get_remote_host $1) _remote_temp

    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 | cut -d' ' -f1`

    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

    local _static _proto _ip_conf _ip_opts _ifname_opts

    _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")

    _netmac=$(kdump_get_mac_addr $_netdev)

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

        kdump_setup_znet $_netdev

    fi

    _static=$(kdump_static_ip $_netdev $_srcaddr)

    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=${_static}$(kdump_setup_ifname $_netdev):${_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"

    elif kdump_is_team "$_netdev"; then

        kdump_setup_team "$_netdev"

    elif kdump_is_vlan "$_netdev"; then

        kdump_setup_vlan "$_netdev"

    else

        _ifname_opts=" ifname=$(kdump_setup_ifname $_netdev):$_netmac"

        echo "$_ifname_opts" >> $_ip_conf

    fi

    kdump_setup_dns "$_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

    # 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=$(kdump_setup_ifname $_netdev)" > ${initdir}/etc/cmdline.d/60kdumpnic.conf

        echo "bootdev=$(kdump_setup_ifname $_netdev)" > ${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

    (read_strip_comments /etc/kdump.conf) > ${initdir}/tmp/$$-kdump.conf

    while read _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)

            dracut_install $_val

            ;;

        core_collector)

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

            ;;

        esac

    done <<< "$(read_strip_comments /etc/kdump.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

}

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

# and apply some optimization for kdump

overwrite_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"

    mkdir -p "${initdir}/etc/sysctl.d"

    echo "vm.zone_reclaim_mode = 3" > "${initdir}/etc/sysctl.d/99-zone-reclaim.conf"

}

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 _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; local userpwd_str;

    local username_in; local password_in; local userpwd_in_str;

    local netroot_str ; local initiator_str;

    local netroot_conf="${initdir}/etc/cmdline.d/50iscsi.conf"

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

    dinfo "Found iscsi component $1"

    # Check once before getting explicit values, so we can bail out early,

    # e.g. in case of pure-hardware(all-offload) iscsi.

    if ! /sbin/iscsiadm -m session -r ${path} &>/dev/null ; then

        return 1

    fi

    if is_ibft ${path}; then

        return

    fi

    # Remove software iscsi cmdline generated by 95iscsi,

    # and let kdump regenerate here.

    rm -f ${initdir}/etc/cmdline.d/95iscsi.conf

    tgt_name=$(kdump_iscsi_get_rec_val ${path} "node.name")

    tgt_ipaddr=$(kdump_iscsi_get_rec_val ${path} "node.conn\[0\].address")

    # get and set username and password details

    username=$(kdump_iscsi_get_rec_val ${path} "node.session.auth.username")

    [ "$username" == "<empty>" ] && username=""

    password=$(kdump_iscsi_get_rec_val ${path} "node.session.auth.password")

    [ "$password" == "<empty>" ] && password=""

    username_in=$(kdump_iscsi_get_rec_val ${path} "node.session.auth.username_in")

    [ -n "$username" ] && userpwd_str="$username:$password"

    # get and set incoming username and password details

    [ "$username_in" == "<empty>" ] && username_in=""

    password_in=$(kdump_iscsi_get_rec_val ${path} "node.session.auth.password_in")

    [ "$password_in" == "<empty>" ] && password_in=""

    [ -n "$username_in" ] && userpwd_in_str=":$username_in:$password_in"

    kdump_install_net "$tgt_ipaddr"

    # prepare netroot= command line

    # FIXME: Do we need to parse and set other parameters like protocol, port

    #        iscsi_iface_name, netdev_name, LUN etc.

    if is_ipv6_address $tgt_ipaddr; then

        tgt_ipaddr="[$tgt_ipaddr]"

    fi

    netroot_str="netroot=iscsi:${userpwd_str}${userpwd_in_str}@$tgt_ipaddr::::$tgt_name"

    [[ -f $netroot_conf ]] || touch $netroot_conf

    # If netroot target does not exist already, append.

    if ! grep -q $netroot_str $netroot_conf; then

         echo $netroot_str >> $netroot_conf

         dinfo "Appended $netroot_str to $netroot_conf"

    fi

    # Setup initator

    initiator_str=$(kdump_get_iscsi_initiator)

    [ $? -ne "0" ] && derror "Failed to get initiator name" && return 1

    # If initiator details do not exist already, append.

    if ! grep -q "$initiator_str" $netroot_conf; then

         echo "$initiator_str" >> $netroot_conf

         dinfo "Appended "$initiator_str" to $netroot_conf"

    fi

}

kdump_check_iscsi_targets () {

    # If our prerequisites are not met, fail anyways.

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

    kdump_check_setup_iscsi() (

        local _dev

        _dev=$1

        [[ -L /sys/dev/block/$_dev ]] || return

        cd "$(readlink -f /sys/dev/block/$_dev)"

        until [[ -d sys || -d iscsi_session ]]; do

            cd ..

        done

        [[ -d iscsi_session ]] && kdump_setup_iscsi_device "$PWD"

    )

    [[ $hostonly ]] || [[ $mount_needs ]] && {

        for_each_host_dev_and_slaves_all kdump_check_setup_iscsi

    }

}

# hostname -a is deprecated, do it by ourself

get_alias() {

    local ips

    local entries

    local alias_set

    ips=$(hostname -I)

    for ip in $ips

    do

            # in /etc/hosts, alias can come at the 2nd column

            entries=$(grep $ip /etc/hosts | awk '{ $1=""; print $0 }')

            if [ $? -eq 0 ]; then

                    alias_set="$alias_set $entries"

            fi

    done

    echo $alias_set

}

is_localhost() {

    local hostnames=$(hostname -A)

    local shortnames=$(hostname -A -s)

    local aliasname=$(get_alias)

    local nodename=$1

    hostnames="$hostnames $shortnames $aliasname"

    for name in ${hostnames}; do

        if [ "$name" == "$nodename" ]; then

            return 0

        fi

    done

    return 1

}

# retrieves fence_kdump nodes from Pacemaker cluster configuration

get_pcs_fence_kdump_nodes() {

    local nodes

    pcs cluster sync > /dev/null 2>&1 && pcs cluster cib-upgrade > /dev/null 2>&1

    # get cluster nodes from cluster cib, get interface and ip address

    nodelist=`pcs cluster cib | xmllint --xpath "/cib/status/node_state/@uname" -`

    # nodelist is formed as 'uname="node1" uname="node2" ... uname="nodeX"'

    # we need to convert each to node1, node2 ... nodeX in each iteration

    for node in ${nodelist}; do

        # convert $node from 'uname="nodeX"' to 'nodeX'

        eval $node

        nodename=$uname

        # Skip its own node name

        if is_localhost $nodename; then

            continue

        fi

        nodes="$nodes $nodename"

    done

    echo $nodes

}

# retrieves fence_kdump args from config file

get_pcs_fence_kdump_args() {

    if [ -f $FENCE_KDUMP_CONFIG_FILE ]; then

        . $FENCE_KDUMP_CONFIG_FILE

        echo $FENCE_KDUMP_OPTS

    fi

}

get_generic_fence_kdump_nodes() {

    local filtered

    local nodes

    nodes=$(get_option_value "fence_kdump_nodes")

    for node in ${nodes}; do

        # Skip its own node name

        if is_localhost $node; then

            continue

        fi

        filtered="$filtered $node"

    done

    echo $filtered

}

# setup fence_kdump in cluster

# setup proper network and install needed files

kdump_configure_fence_kdump () {

    local kdump_cfg_file=$1

    local nodes

    local args

    if is_generic_fence_kdump; then

        nodes=$(get_generic_fence_kdump_nodes)

    elif is_pcs_fence_kdump; then

        nodes=$(get_pcs_fence_kdump_nodes)

        # set appropriate options in kdump.conf

        echo "fence_kdump_nodes $nodes" >> ${kdump_cfg_file}

        args=$(get_pcs_fence_kdump_args)

        if [ -n "$args" ]; then

            echo "fence_kdump_args $args" >> ${kdump_cfg_file}

        fi

    else

        # fence_kdump not configured

        return 1

    fi

    # setup network for each node

    for node in ${nodes}; do

        kdump_install_net $node

    done

    dracut_install /etc/hosts

    dracut_install /etc/nsswitch.conf

    dracut_install $FENCE_KDUMP_SEND

}

# Install a random seed used to feed /dev/urandom

# By the time kdump service starts, /dev/uramdom is already fed by systemd

kdump_install_random_seed() {

    local poolsize=`cat /proc/sys/kernel/random/poolsize`

    if [ ! -d ${initdir}/var/lib/ ]; then

        mkdir -p ${initdir}/var/lib/

    fi

    dd if=/dev/urandom of=${initdir}/var/lib/random-seed \

       bs=$poolsize count=1 2> /dev/null

}

kdump_install_systemd_conf() {

    local failure_action=$(get_option_value "failure_action")

    # Kdump turns out to require longer default systemd mount timeout

    # than 1st kernel(90s by default), we use default 300s for kdump.

    grep -r "^[[:space:]]*DefaultTimeoutStartSec=" ${initdir}/etc/systemd/system.conf* &>/dev/null

    if [ $? -ne 0 ]; then

        mkdir -p ${initdir}/etc/systemd/system.conf.d

        echo "[Manager]" > ${initdir}/etc/systemd/system.conf.d/kdump.conf

        echo "DefaultTimeoutStartSec=300s" >> ${initdir}/etc/systemd/system.conf.d/kdump.conf

    fi

    # Forward logs to console directly, and don't read Kmsg, this avoids

    # unneccessary memory consumption and make console output more useful.

    # Only do so for non fadump image.

    if ! is_fadump_capable; then

        mkdir -p ${initdir}/etc/systemd/journald.conf.d

        echo "[Journal]" > ${initdir}/etc/systemd/journald.conf.d/kdump.conf

        echo "Storage=volatile" >> ${initdir}/etc/systemd/journald.conf.d/kdump.conf

        echo "ReadKMsg=no" >> ${initdir}/etc/systemd/journald.conf.d/kdump.conf

        echo "ForwardToConsole=yes" >> ${initdir}/etc/systemd/journald.conf.d/kdump.conf

    fi

}

install() {

    kdump_install_conf

    overwrite_sysctl_conf

    if is_ssh_dump_target; then

        kdump_install_random_seed

    fi

    dracut_install -o /etc/adjtime /etc/localtime

    inst "$moddir/monitor_dd_progress" "/kdumpscripts/monitor_dd_progress"

    chmod +x ${initdir}/kdumpscripts/monitor_dd_progress

    inst "/bin/dd" "/bin/dd"

    inst "/bin/tail" "/bin/tail"

    inst "/bin/date" "/bin/date"

    inst "/bin/sync" "/bin/sync"

    inst "/bin/cut" "/bin/cut"

    inst "/bin/head" "/bin/head"

    inst "/bin/awk" "/bin/awk"

    inst "/bin/sed" "/bin/sed"

    inst "/sbin/makedumpfile" "/sbin/makedumpfile"

    inst "/sbin/vmcore-dmesg" "/sbin/vmcore-dmesg"

    inst "/usr/bin/printf" "/sbin/printf"

    inst "/usr/bin/logger" "/sbin/logger"

    inst "/lib/kdump/kdump-lib.sh" "/lib/kdump-lib.sh"

    inst "/lib/kdump/kdump-lib-initramfs.sh" "/lib/kdump-lib-initramfs.sh"

    inst "/lib/kdump/kdump-logger.sh" "/lib/kdump-logger.sh"

    inst "$moddir/kdump.sh" "/usr/bin/kdump.sh"

    inst "$moddir/kdump-capture.service" "$systemdsystemunitdir/kdump-capture.service"

    systemctl -q --root "$initdir" add-wants initrd.target kdump-capture.service

    inst "$moddir/kdump-error-handler.sh" "/usr/bin/kdump-error-handler.sh"

    inst "$moddir/kdump-error-handler.service" "$systemdsystemunitdir/kdump-error-handler.service"

    # Replace existing emergency service and emergency target

    cp "$moddir/kdump-emergency.service" "$initdir/$systemdsystemunitdir/emergency.service"

    cp "$moddir/kdump-emergency.target" "$initdir/$systemdsystemunitdir/emergency.target"

    # Also redirect dracut-emergency to kdump error handler

    ln_r "$systemdsystemunitdir/emergency.service" "$systemdsystemunitdir/dracut-emergency.service"

    # Check for all the devices and if any device is iscsi, bring up iscsi

    # target. Ideally all this should be pushed into dracut iscsi module

    # at some point of time.

    kdump_check_iscsi_targets

    kdump_install_systemd_conf

    # nfs/ssh dump will need to get host ip in second kernel and need to call 'ip' tool, see get_host_ip for more detail

    if is_nfs_dump_target || is_ssh_dump_target; then

        inst "ip"

    fi

    # For the lvm type target under kdump, in /etc/lvm/lvm.conf we can

    # safely replace "reserved_memory=XXXX"(default value is 8192) with

    # "reserved_memory=1024" to lower memory pressure under kdump. We do

    # it unconditionally here, if "/etc/lvm/lvm.conf" doesn't exist, it

    # actually does nothing.

    sed -i -e \

      's/\(^[[:space:]]*reserved_memory[[:space:]]*=\)[[:space:]]*[[:digit:]]*/\1 1024/' \