Edit - kdump.tar

Edit: kdump.tar

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#
# This comes from the dracut-logger.sh
#
# The logger defined 4 logging levels:
#   - ddebug (4)
#     The DEBUG Level designates fine-grained informational events that are most
#     useful to debug an application.
#   - dinfo (3)
#     The INFO level designates informational messages that highlight the
#     progress of the application at coarse-grained level.
#   - dwarn (2)
#     The WARN level designates potentially harmful situations.
#   - derror (1)
#     The ERROR level designates error events that might still allow the
#     application to continue running.
#
# Logging is controlled by following global variables:
#   - @var kdump_stdloglvl - logging level to standard error (console output)
#   - @var kdump_sysloglvl - logging level to syslog (by logger command)
#   - @var kdump_kmsgloglvl - logging level to /dev/kmsg (only for boot-time)
#
# If any of the variables is not set, the function dlog_init() sets it to default:
#   - In the first kernel:
#     - @var kdump_stdloglvl = 3 (info)
#     - @var kdump_sysloglvl = 0 (no logging)
#     - @var kdump_kmsgloglvl = 0 (no logging)
#
#   -In the second kernel:
#    - @var kdump_stdloglvl = 0 (no logging)
#    - @var kdump_sysloglvl = 3 (info)
#    - @var kdump_kmsgloglvl = 0 (no logging)
#
# First of all you have to start with dlog_init() function which initializes
# required variables. Don't call any other logging function before that one!
#

# Define vairables for the log levels in this module.
kdump_stdloglvl=""
kdump_sysloglvl=""
kdump_kmsgloglvl=""

# The dracut-lib.sh is only available in the second kernel, and it won't
# be used in the first kernel because the dracut-lib.sh is invisible in
# the first kernel.
if [ -f /lib/dracut-lib.sh ]; then
    . /lib/dracut-lib.sh
fi

# @brief Get the log level from kernel command line.
# @retval 1 if something has gone wrong
# @retval 0 on success.
#
get_kdump_loglvl()
{
    (type -p getarg) && kdump_sysloglvl=$(getarg rd.kdumploglvl)
    [ -z "$kdump_sysloglvl" ] && return 1;

(type -p isdigit) && isdigit $kdump_sysloglvl
    [ $? -ne 0 ] && return 1;

return 0
}

# @brief Check the log level.
# @retval 1 if something has gone wrong
# @retval 0 on success.
#
check_loglvl()
{
    case "$1" in
        0|1|2|3|4)
            return 0
           ;;
        *)
            return 1
            ;;
        esac
}

# @brief Initializes Logger.
# @retval 1 if something has gone wrong
# @retval 0 on success.
#
dlog_init() {
    local ret=0; local errmsg

if [ -s /proc/vmcore ];then
        get_kdump_loglvl
        if [ $? -ne 0 ];then
            logger -t "kdump[$$]" -p warn -- "Kdump is using the default log level(3)."
            kdump_sysloglvl=3
        fi
        kdump_stdloglvl=0
        kdump_kmsgloglvl=0
    else
        kdump_stdloglvl=$KDUMP_STDLOGLVL
        kdump_sysloglvl=$KDUMP_SYSLOGLVL
        kdump_kmsgloglvl=$KDUMP_KMSGLOGLVL
    fi

[ -z "$kdump_stdloglvl" ] && kdump_stdloglvl=3
    [ -z "$kdump_sysloglvl" ] && kdump_sysloglvl=0
    [ -z "$kdump_kmsgloglvl" ] && kdump_kmsgloglvl=0

for loglvl in "$kdump_stdloglvl" "$kdump_kmsgloglvl" "$kdump_sysloglvl"; do
        check_loglvl "$loglvl"
        if [ $? -ne 0 ]; then
            echo "Illegal log level: $kdump_stdloglvl $kdump_kmsgloglvl $kdump_sysloglvl"
            return 1
        fi
    done

# Skip initialization if it's already done.
    [ -n "$kdump_maxloglvl" ] && return 0

if [[ $UID -ne 0 ]]; then
        kdump_kmsgloglvl=0
        kdump_sysloglvl=0
    fi

if [[ $kdump_sysloglvl -gt 0 ]]; then
        if [[ -d /run/systemd/journal ]] \
            && type -P systemd-cat &>/dev/null \
            && systemctl --quiet is-active systemd-journald.socket &>/dev/null; then
            readonly _systemdcatfile="/var/tmp/systemd-cat"
            mkfifo "$_systemdcatfile" &>/dev/null
            readonly _dlogfd=15
            systemd-cat -t 'kdump' --level-prefix=true <"$_systemdcatfile" &
            exec 15>"$_systemdcatfile"
        elif ! [ -S /dev/log -a -w /dev/log ] || ! command -v logger >/dev/null; then
            # We cannot log to syslog, so turn this facility off.
            kdump_kmsgloglvl=$kdump_sysloglvl
            kdump_sysloglvl=0
            ret=1
            errmsg="No '/dev/log' or 'logger' included for syslog logging"
        fi
    fi

local lvl; local maxloglvl_l=0
    for lvl in $kdump_stdloglvl $kdump_sysloglvl $kdump_kmsgloglvl; do
        [[ $lvl -gt $maxloglvl_l ]] && maxloglvl_l=$lvl
    done
    readonly kdump_maxloglvl=$maxloglvl_l
    export kdump_maxloglvl

if [[ $kdump_stdloglvl -lt 4 ]] && [[ $kdump_kmsgloglvl -lt 4 ]] && [[ $kdump_sysloglvl -lt 4 ]]; then
        unset ddebug
        ddebug() { :; };
    fi

if [[ $kdump_stdloglvl -lt 3 ]] && [[ $kdump_kmsgloglvl -lt 3 ]] && [[ $kdump_sysloglvl -lt 3 ]]; then
        unset dinfo
        dinfo() { :; };
    fi

if [[ $kdump_stdloglvl -lt 2 ]] && [[ $kdump_kmsgloglvl -lt 2 ]] && [[ $kdump_sysloglvl -lt 2 ]]; then
        unset dwarn
        dwarn() { :; };
        unset dwarning
        dwarning() { :; };
    fi

if [[ $kdump_stdloglvl -lt 1 ]] && [[ $kdump_kmsgloglvl -lt 1 ]] && [[ $kdump_sysloglvl -lt 1 ]]; then
        unset derror
        derror() { :; };
    fi

[ -n "$errmsg" ] && derror "$errmsg"

return $ret
}

## @brief Converts numeric level to logger priority defined by POSIX.2.
#
# @param lvl Numeric logging level in range from 1 to 4.
# @retval 1 if @a lvl is out of range.
# @retval 0 if @a lvl is correct.
# @result Echoes logger priority.
_lvl2syspri() {
    case "$1" in
        1) echo error;;
        2) echo warning;;
        3) echo info;;
        4) echo debug;;
        *) return 1;;
    esac
}

## @brief Converts logger numeric level to syslog log level
#
# @param lvl Numeric logging level in range from 1 to 4.
# @retval 1 if @a lvl is out of range.
# @retval 0 if @a lvl is correct.
# @result Echoes kernel console numeric log level
#
# Conversion is done as follows:
#
# <tt>
#   none     -> LOG_EMERG (0)
#   none     -> LOG_ALERT (1)
#   none     -> LOG_CRIT (2)
#   ERROR(1) -> LOG_ERR (3)
#   WARN(2)  -> LOG_WARNING (4)
#   none     -> LOG_NOTICE (5)
#   INFO(3)  -> LOG_INFO (6)
#   DEBUG(4) -> LOG_DEBUG (7)
# </tt>
#
# @see /usr/include/sys/syslog.h
_dlvl2syslvl() {
    local lvl

case "$1" in
        1) lvl=3;;
        2) lvl=4;;
        3) lvl=6;;
        4) lvl=7;;
        *) return 1;;
    esac

# The number is constructed by multiplying the facility by 8 and then
    # adding the level.
    # About The Syslog Protocol, please refer to the RFC5424 for more details.
    echo $((24+$lvl))
}

## @brief Prints to stderr, to syslog and/or /dev/kmsg given message with
#  given level (priority).
#
# @param lvl Numeric logging level.
# @param msg Message.
# @retval 0 It's always returned, even if logging failed.
#
# @note This function is not supposed to be called manually. Please use
# dinfo(), ddebug(), or others instead which wrap this one.
#
# This is core logging function which logs given message to standard error
# and/or syslog (with POSIX shell command <tt>logger</tt>) and/or to /dev/kmsg.
# The format is following:
#
# <tt>X: some message</tt>
#
# where @c X is the first letter of logging level. See module description for
# details on that.
#
# Message to syslog is sent with tag @c kdump. Priorities are mapped as
# following:
#   - @c ERROR to @c error
#   - @c WARN to @c warning
#   - @c INFO to @c info
#   - @c DEBUG to @c debug
_do_dlog() {
    local lvl="$1"; shift
    local msg="$*"

[[ $lvl -le $kdump_stdloglvl ]] && printf -- 'kdump: %s\n' "$msg" >&2

if [[ $lvl -le $kdump_sysloglvl ]]; then
        if [[ "$_dlogfd" ]]; then
            printf -- "<%s>%s\n" "$(($(_dlvl2syslvl $lvl) & 7))" "$msg" >&$_dlogfd
        else
            logger -t "kdump[$$]" -p $(_lvl2syspri $lvl) -- "$msg"
        fi
    fi

[[ $lvl -le $kdump_kmsgloglvl ]] && \
        echo "<$(_dlvl2syslvl $lvl)>kdump[$$] $msg" >/dev/kmsg
}

## @brief Internal helper function for _do_dlog()
#
# @param lvl Numeric logging level.
# @param msg Message.
# @retval 0 It's always returned, even if logging failed.
#
# @note This function is not supposed to be called manually. Please use
# dinfo(), ddebug(), or others instead which wrap this one.
#
# This function calls _do_dlog() either with parameter msg, or if
# none is given, it will read standard input and will use every line as
# a message.
#
# This enables:
# dwarn "This is a warning"
# echo "This is a warning" | dwarn
dlog() {
    [ -z "$kdump_maxloglvl" ] && return 0
    [[ $1 -le $kdump_maxloglvl ]] || return 0

if [[ $# -gt 1 ]]; then
        _do_dlog "$@"
    else
        while read line || [ -n "$line" ]; do
            _do_dlog "$1" "$line"
        done
    fi
}

## @brief Logs message at DEBUG level (4)
#
# @param msg Message.
# @retval 0 It's always returned, even if logging failed.
ddebug() {
    set +x
    dlog 4 "$@"
    [ -n "$debug" ] && set -x || :
}

## @brief Logs message at INFO level (3)
#
# @param msg Message.
# @retval 0 It's always returned, even if logging failed.
dinfo() {
    set +x
    dlog 3 "$@"
    [ -n "$debug" ] && set -x || :
}

## @brief Logs message at WARN level (2)
#
# @param msg Message.
# @retval 0 It's always returned, even if logging failed.
dwarn() {
    set +x
    dlog 2 "$@"
    [ -n "$debug" ] && set -x || :
}

## @brief It's an alias to dwarn() function.
#
# @param msg Message.
# @retval 0 It's always returned, even if logging failed.
dwarning() {
    set +x
    dwarn "$@"
    [ -n "$debug" ] && set -x || :
}

## @brief Logs message at ERROR level (1)
#
# @param msg Message.
# @retval 0 It's always returned, even if logging failed.
derror() {
    set +x
    dlog 1 "$@"
    [ -n "$debug" ] && set -x || :
}
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#
# Kdump common variables and functions
#

DEFAULT_PATH="/var/crash/"
FENCE_KDUMP_CONFIG_FILE="/etc/sysconfig/fence_kdump"
FENCE_KDUMP_SEND="/usr/libexec/fence_kdump_send"
FADUMP_ENABLED_SYS_NODE="/sys/kernel/fadump_enabled"
LVM_CONF="/etc/lvm/lvm.conf"

is_fadump_capable()
{
    # Check if firmware-assisted dump is enabled
    # if no, fallback to kdump check
    if [ -f $FADUMP_ENABLED_SYS_NODE ]; then
        rc=`cat $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
}

perror_exit() {
    derror "$@"
    exit 1
}

is_ssh_dump_target()
{
    grep -q "^ssh[[:blank:]].*@" /etc/kdump.conf
}

is_nfs_dump_target()
{
    grep -q "^nfs" /etc/kdump.conf || \
        [[ $(get_dracut_args_fstype "$(grep "^dracut_args .*\-\-mount" /etc/kdump.conf)") = nfs* ]]
}

is_raw_dump_target()
{
    grep -q "^raw" /etc/kdump.conf
}

is_fs_type_nfs()
{
    local _fstype=$1
    [ $_fstype = "nfs" ] || [ $_fstype = "nfs4" ] && return 0
    return 1
}

is_fs_dump_target()
{
    egrep -q "^ext[234]|^xfs|^btrfs|^minix" /etc/kdump.conf
}

is_lvm2_thinp_device()
{
    _device_path=$1
    _lvm2_thin_device=$(lvm lvs -S 'lv_layout=sparse && lv_layout=thin' \
        --nosuffix --noheadings -o vg_name,lv_name "$_device_path" 2> /dev/null)

[ -n "$_lvm2_thin_device" ]
}

strip_comments()
{
    echo $@ | sed -e 's/$.*$#.*/\1/'
}

# Read from kdump config file stripping all comments
read_strip_comments()
{
    # strip heading spaces, and print any content starting with
    # neither space or #, and strip everything after #
    sed -n -e "s/^\s*$[^# \t][^#]\+$.*/\1/gp" $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

grep -q "^fence_kdump_nodes" /etc/kdump.conf
}

to_dev_name() {
    local dev="${1//\"/}"

case "$dev" in
    UUID=*)
        dev=`blkid -U "${dev#UUID=}"`
        ;;
    LABEL=*)
        dev=`blkid -L "${dev#LABEL=}"`
        ;;
    esac
    echo $dev
}

is_user_configured_dump_target()
{
    return $(is_mount_in_dracut_args || is_ssh_dump_target || is_nfs_dump_target || \
             is_raw_dump_target || is_fs_dump_target)
}

get_user_configured_dump_disk()
{
    local _target

_target=$(egrep "^ext[234]|^xfs|^btrfs|^minix|^raw" /etc/kdump.conf 2>/dev/null |awk '{print $2}')
    [ -n "$_target" ] && echo $_target && return

_target=$(get_dracut_args_target "$(grep "^dracut_args .*\-\-mount" /etc/kdump.conf)")
    [ -b "$_target" ] && echo $_target
}

get_root_fs_device()
{
    findmnt -k -f -n -o SOURCE /
}

get_save_path()
{
    local _save_path=$(awk '$1 == "path" {print $2}' /etc/kdump.conf)
    [ -z "$_save_path" ] && _save_path=$DEFAULT_PATH

# strip the duplicated "/"
    echo $_save_path | tr -s /
}

get_block_dump_target()
{
    local _target _path

if is_ssh_dump_target || is_nfs_dump_target; then
        return
    fi

_target=$(get_user_configured_dump_disk)
    [ -n "$_target" ] && echo $(to_dev_name $_target) && return

# Get block device name from local save path
    _path=$(get_save_path)
    _target=$(get_target_from_path $_path)
    [ -b "$_target" ] && echo $(to_dev_name $_target)
}

is_dump_to_rootfs()
{
    grep -E "^(failure_action|default)[[:space:]]dump_to_rootfs" /etc/kdump.conf >/dev/null
}

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" ] && echo $(to_dev_name $_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" -a "$kdump_targets" != "$_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 $_mntpoint equals to
# $_mntpoint_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 _path=$1
    # In case it's a sub path in a mount point, get the mount point first
    local _mnt_top=$(df $_path | tail -1 | awk '{print $NF}')
    local _mntpoint=$(findmnt $_mnt_top | tail -n 1 | awk '{print $2}')
    local _mntpoint_nofsroot=$(findmnt -v $_mnt_top | tail -n 1 | awk '{print $2}')

if [[ "$_mntpoint" = $_mntpoint_nofsroot ]]; then
        echo $_path && return
    fi

_mntpoint=${_mntpoint#*$_mntpoint_nofsroot}
    _mntpoint=${_mntpoint#[}
    _mntpoint=${_mntpoint%]}
    _path=${_path#$_mnt_top}

echo $_mntpoint$_path
}

# Return the current underlaying device of a path, ignore bind mounts
get_target_from_path()
{
    local _target

_target=$(df $1 2>/dev/null | tail -1 |  awk '{print $1}')
    [[ "$_target" == "/dev/root" ]] && [[ ! -e /dev/root ]] && _target=$(get_root_fs_device)
    echo $_target
}

is_mounted()
{
    findmnt -k -n $1 &>/dev/null
}

get_mount_info()
{
    local _info_type=$1 _src_type=$2 _src=$3; shift 3
    local _info=$(findmnt -k -n -r -o $_info_type --$_src_type $_src $@)

[ -z "$_info" ] && [ -e "/etc/fstab" ] && _info=$(findmnt -s -n -r -o $_info_type --$_src_type $_src $@)

echo $_info
}

get_fs_type_from_target()
{
    get_mount_info FSTYPE source $1 -f
}

get_mntopt_from_target()
{
    get_mount_info OPTIONS source $1 -f
}
# Find the general mount point of a dump target, not the bind mount point
get_mntpoint_from_target()
{
    # Expcilitly specify --source to findmnt could ensure non-bind mount is returned
    get_mount_info TARGET source $1 -f
}

# Get the path where the target will be mounted in kdump kernel
# $1: kdump target device
get_kdump_mntpoint_from_target()
{
    local _mntpoint=$(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 "/"
}

# get_option_value <option_name>
# retrieves value of option defined in kdump.conf
get_option_value() {
    strip_comments `grep "^$1[[:space:]]\+" /etc/kdump.conf | tail -1 | cut -d\  -f2-`
}

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_ostree()
{
    test -f /run/ostree-booted
}

# fixme, try the best to decide whether the ipv6 addr is allocated by slaac or dhcp6
is_ipv6_auto()
{
    local _netdev=$1
    local _auto=$(cat /proc/sys/net/ipv6/conf/$_netdev/autoconf)
    if [ $_auto -eq 1 ]; then
        return 0
    else
        return 1
    fi
}

is_ipv6_address()
{
    echo $1 | grep -q ":"
}

# 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=`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_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

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

local 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 -- $(grep  "^dracut_args" /etc/kdump.conf)
    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
}

# If "dracut_args" contains "--mount" information, use it
# directly without any check(users are expected to ensure
# its correctness).
is_mount_in_dracut_args()
{
    grep -q "^dracut_args .*\-\-mount" /etc/kdump.conf
}

# If $1 contains dracut_args "--mount", return <filesystem type>
get_dracut_args_fstype()
{
    echo $1 | grep "\-\-mount" | sed "s/.*--mount .$.*$/\1/" | cut -d' ' -f3
}

# If $1 contains dracut_args "--mount", return <device>
get_dracut_args_target()
{
    echo $1 | grep "\-\-mount" | sed "s/.*--mount .$.*$/\1/" | cut -d' ' -f1
}

get_reserved_mem_size()
{
	local reserved_mem_size=0

if is_fadump_capable; then
		reserved_mem_size=$(< /sys/kernel/fadump/mem_reserved)
	else
		reserved_mem_size=$(< /sys/kernel/kexec_crash_size)
	fi

echo "$reserved_mem_size"
}

check_crash_mem_reserved()
{
    local mem_reserved

mem_reserved=$(get_reserved_mem_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=`cat /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" && "$(cat /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 [ "$ARCH" == "i686" -o "$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

# For secureboot enabled machines, use new kexec file based syscall.
    # Old syscall will always fail as it does not have capability to do
    # kernel signature verification.
    if is_secure_boot_enforced; then
        dinfo "Secure Boot is enabled. Using kexec file based syscall."
        kexec_args="$kexec_args -s"
    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"

# The kernel of OSTree based systems is not in the standard locations.
    if is_ostree; then
        boot_dirlist="$(echo /boot/ostree/*) $boot_dirlist"
    fi

# Use BOOT_IMAGE as reference if possible, strip the GRUB root device prefix in (hd0,gpt1) format
    boot_img="$(grep -P -o '^BOOT_IMAGE=(\S+)' /proc/cmdline | sed "s/^BOOT_IMAGE=$(\S*)$\?$\S*$/\2/")"
    if [[ "$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 enviromental 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

if [ -z "$1" ]; then
        cmdline=$(cat /proc/cmdline)
    else
        cmdline="$1"
    fi

# These params should always be removed
    cmdline=$(remove_cmdline_param "$cmdline" crashkernel panic_on_warn)
    # These params can be removed configurably
    cmdline=$(remove_cmdline_param "$cmdline" "$2")

# Always remove "root=X", as we now explicitly generate all kinds
    # of dump target mount information including root fs.
    #
    # We do this before KDUMP_COMMANDLINE_APPEND, if one really cares
    # about it(e.g. for debug purpose), then can pass "root=X" using
    # KDUMP_COMMANDLINE_APPEND.
    cmdline=$(remove_cmdline_param "$cmdline" root)

# With the help of "--hostonly-cmdline", we can avoid some interitage.
    cmdline=$(remove_cmdline_param "$cmdline" rd.lvm.lv rd.luks.uuid rd.dm.uuid rd.md.uuid fcoe)

# Remove netroot, rd.iscsi.initiator and iscsi_initiator since
    # we get duplicate entries for the same in case iscsi code adds
    # it as well.
    cmdline=$(remove_cmdline_param "$cmdline" netroot rd.iscsi.initiator iscsi_initiator)

cmdline="${cmdline} $3"

id=$(get_bootcpu_apicid)
    if [ ! -z ${id} ] ; then
        cmdline=$(append_cmdline "${cmdline}" disable_cpu_apicid ${id})
    fi

# If any watchdog is used, set it's pretimeout to 0. pretimeout let
    # watchdog panic the kernel first, and reset the system after the
    # panic. If the system is already in kdump, panic is not helpful
    # and only increase the chance of watchdog failure.
    for i in $(get_watchdog_drvs); do
        cmdline+=" $i.pretimeout=0"

if [[ $i == hpwdt ]]; then
            # hpwdt have a special parameter kdumptimeout, is's only suppose
            # to be set to non-zero in first kernel. In kdump, non-zero
            # value could prevent the watchdog from resetting the system.
            cmdline+=" $i.kdumptimeout=0"
        fi
    done

echo ${cmdline}
}

#get system memory size in the unit of GB
get_system_size()
{
    result=$(cat /proc/iomem  | grep "System RAM" | awk -F ":" '{ print $1 }' | tr [:lower:] [:upper:] | paste -sd+)
    result="+$result"
    # replace '-' with '+0x' and '+' with '-0x'
    sum=$( echo $result | sed -e 's/-/K0x/g' | sed -e 's/+/-0x/g' | sed -e 's/K/+/g' )
    size=$(printf "%d\n" $(($sum)))

# in MB unit
    let size=$size/1024/1024
    # since RHEL-8.5 kernel round up total memory to 128M, so should user space
    let size=($size+127)/128
    let size=$size*128
    # in GB unit
    let size=$size/1024

echo $size
}

get_recommend_size()
{
    local mem_size=$1
    local _ck_cmdline=$2
    local OLDIFS="$IFS"

last_sz=""
    last_unit=""

start=${_ck_cmdline: :1}
    if [ $mem_size -lt $start ]; then
        echo "0M"
        return
    fi
    IFS=','
    for i in $_ck_cmdline; do
        end=$(echo $i | awk -F "-" '{ print $2 }' | awk -F ":" '{ print $1 }')
        recommend=$(echo $i | awk -F "-" '{ print $2 }' | awk -F ":" '{ print $2 }')
        size=${end: : -1}
        unit=${end: -1}
        if [ $unit == 'T' ]; then
            let size=$size*1024
        fi
        if [ $mem_size -lt $size ]; then
            echo $recommend
            IFS="$OLDIFS"
            return
        fi
    done
    IFS="$OLDIFS"
}

# return recommended size based on current system RAM size
kdump_get_arch_recommend_size()
{
    if ! [[ -r "/proc/iomem" ]] ; then
        echo "Error, can not access /proc/iomem."
        return 1
    fi
    arch=$(lscpu | grep Architecture | awk -F ":" '{ print $2 }' | tr [:lower:] [:upper:])

if [ $arch == "X86_64" ] || [ $arch == "S390X" ]; then
        ck_cmdline="1G-4G:160M,4G-64G:192M,64G-1T:256M,1T-:512M"
    elif [ $arch == "AARCH64" ]; then
        ck_cmdline="2G-:448M"
    elif [ $arch == "PPC64LE" ]; then
        if is_fadump_capable; then
            ck_cmdline="4G-16G:768M,16G-64G:1G,64G-128G:2G,128G-1T:4G,1T-2T:6G,2T-4T:12G,4T-8T:20G,8T-16T:36G,16T-32T:64G,32T-64T:128G,64T-:180G"
        else
            ck_cmdline="2G-4G:384M,4G-16G:512M,16G-64G:1G,64G-128G:2G,128G-:4G"
        fi
    fi

ck_cmdline=$(echo $ck_cmdline | sed -e 's/-:/-102400T:/g')
    sys_mem=$(get_system_size)
    result=$(get_recommend_size $sys_mem "$ck_cmdline")
    echo $result
    return 0
}

# Print all underlying crypt devices of a block device
# print nothing if device is not on top of a crypt device
# $1: the block device to be checked in maj:min format
get_luks_crypt_dev()
{
    local _type

[[ -b /dev/block/$1 ]] || return 1

_type=$(blkid -u filesystem,crypto -o export -- "/dev/block/$1" | \
            sed -n -E "s/^TYPE=(.*)$/\1/p")
    [[ $_type == "crypto_LUKS" ]] && echo $1

for _x in /sys/dev/block/$1/slaves/*; do
        [[ -f $_x/dev ]] || continue
        [[ $_x/subsystem -ef /sys/class/block ]] || continue
        get_luks_crypt_dev "$(< "$_x/dev")"
    done
}

# kdump_get_maj_min <device>
# Prints the major and minor of a device node.
# Example:
# $ get_maj_min /dev/sda2
# 8:2
kdump_get_maj_min() {
    local _majmin
    _majmin="$(stat -L -c '%t:%T' "$1" 2> /dev/null)"
    printf "%s" "$((0x${_majmin%:*})):$((0x${_majmin#*:}))"
}

get_all_kdump_crypt_dev()
{
    local _dev _crypt

for _dev in $(get_block_dump_target); do
        _crypt=$(get_luks_crypt_dev $(kdump_get_maj_min "$_dev"))
        [[ -n "$_crypt" ]] && echo $_crypt
    done
}

check_vmlinux()
{
    # Use readelf to check if it's a valid ELF
    readelf -h $1 &>/dev/null || return 1
}

get_vmlinux_size()
{
    local size=0

while read _type _offset _virtaddr _physaddr _fsize _msize _flg _aln; do
        size=$(( $size + $_msize ))
    done <<< $(readelf -l -W $1 | grep "^  LOAD" 2>/dev/stderr)

echo $size
}

try_decompress()
{
    # The obscure use of the "tr" filter is to work around older versions of
    # "grep" that report the byte offset of the line instead of the pattern.

# Try to find the header ($1) and decompress from here
    for pos in `tr "$1\n$2" "\n$2=" < "$4" | grep -abo "^$2"`
    do
        if ! type -P $3 > /dev/null; then
            ddebug "Signiature detected but '$3' is missing, skip this decompressor"
            break
        fi

pos=${pos%%:*}
        tail -c+$pos "$img" | $3 > $5 2> /dev/null
        if check_vmlinux $5; then
            ddebug "Kernel is extracted with '$3'"
            return 0
        fi
    done

return 1
}

# Borrowed from linux/scripts/extract-vmlinux
get_kernel_size()
{
    # Prepare temp files:
    local img=$1 tmp=$(mktemp /tmp/vmlinux-XXX)
    trap "rm -f $tmp" 0

# Try to check if it's a vmlinux already
    check_vmlinux $img && get_vmlinux_size $img && return 0

# That didn't work, so retry after decompression.
    try_decompress '\037\213\010' xy    gunzip    $img $tmp || \
    try_decompress '\3757zXZ\000' abcde unxz      $img $tmp || \
    try_decompress 'BZh'          xy    bunzip2   $img $tmp || \
    try_decompress '\135\0\0\0'   xxx   unlzma    $img $tmp || \
    try_decompress '\211\114\132' xy    'lzop -d' $img $tmp || \
    try_decompress '\002!L\030'   xxx   'lz4 -d'  $img $tmp || \
    try_decompress '(\265/\375'   xxx   unzstd    $img $tmp

# Finally check for uncompressed images or objects:
    [[ $? -eq 0 ]] && get_vmlinux_size $tmp && return 0

# Fallback to use iomem
    local _size=0
    for _seg in $(cat /proc/iomem  | grep -E "Kernel (code|rodata|data|bss)" | cut -d ":" -f 1); do
	    _size=$(( $_size + 0x${_seg#*-} - 0x${_seg%-*} ))
    done
    echo $_size
}
���������������������������������������������������������������������������������������������������������������������������������������kdump-lib-initramfs.sh������������������������������������������������������������������������������0000644�����������������00000015404�15146345531�0010771 0����������������������������������������������������������������������������������������������������ustar�00�������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������# These variables and functions are useful in 2nd kernel

. /lib/kdump-lib.sh
. /lib/kdump-logger.sh

KDUMP_PATH="/var/crash"
KDUMP_LOG_FILE="/run/initramfs/kexec-dmesg.log"
CORE_COLLECTOR=""
DEFAULT_CORE_COLLECTOR="makedumpfile -l --message-level 7 -d 31"
DMESG_COLLECTOR="/sbin/vmcore-dmesg"
FAILURE_ACTION="systemctl reboot -f"
DATEDIR=`date +%Y-%m-%d-%T`
HOST_IP='127.0.0.1'
DUMP_INSTRUCTION=""
SSH_KEY_LOCATION="/root/.ssh/kdump_id_rsa"
KDUMP_SCRIPT_DIR="/kdumpscripts"
DD_BLKSIZE=512
FINAL_ACTION="systemctl reboot -f"
KDUMP_CONF="/etc/kdump.conf"
KDUMP_PRE=""
KDUMP_POST=""
NEWROOT="/sysroot"
OPALCORE="/sys/firmware/opal/mpipl/core"

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

get_kdump_confs()
{
    local config_opt config_val

while read config_opt config_val;
    do
        # remove inline comments after the end of a directive.
        case "$config_opt" in
            path)
                KDUMP_PATH="$config_val"
            ;;
            core_collector)
                [ -n "$config_val" ] && CORE_COLLECTOR="$config_val"
            ;;
            sshkey)
                if [ -f "$config_val" ]; then
                    SSH_KEY_LOCATION=$config_val
                fi
            ;;
            kdump_pre)
                KDUMP_PRE="$config_val"
            ;;
            kdump_post)
                KDUMP_POST="$config_val"
            ;;
            fence_kdump_args)
                FENCE_KDUMP_ARGS="$config_val"
            ;;
            fence_kdump_nodes)
                FENCE_KDUMP_NODES="$config_val"
            ;;
            failure_action|default)
                case $config_val in
                    shell)
                        FAILURE_ACTION="kdump_emergency_shell"
                    ;;
                    reboot)
                        FAILURE_ACTION="systemctl reboot -f && exit"
                    ;;
                    halt)
                        FAILURE_ACTION="halt && exit"
                    ;;
                    poweroff)
                        FAILURE_ACTION="systemctl poweroff -f && exit"
                    ;;
                    dump_to_rootfs)
                        FAILURE_ACTION="dump_to_rootfs"
                    ;;
                esac
            ;;
            final_action)
                case $config_val in
                    reboot)
                        FINAL_ACTION="systemctl reboot -f"
                    ;;
                    halt)
                        FINAL_ACTION="halt"
                    ;;
                    poweroff)
                        FINAL_ACTION="systemctl poweroff -f"
                    ;;
                esac
            ;;
        esac
    done <<< "$(read_strip_comments $KDUMP_CONF)"

if [ -z "$CORE_COLLECTOR" ]; then
        CORE_COLLECTOR="$DEFAULT_CORE_COLLECTOR"
        if is_ssh_dump_target || is_raw_dump_target; then
            CORE_COLLECTOR="$CORE_COLLECTOR -F"
        fi
    fi
}

# store the kexec kernel log to a file.
save_log()
{
    dmesg -T > $KDUMP_LOG_FILE

if command -v journalctl > /dev/null; then
        journalctl -ab >> $KDUMP_LOG_FILE
    fi
    chmod 600 $KDUMP_LOG_FILE
}

# dump_fs <mount point>
dump_fs()
{
    local _exitcode
    local _mp=$1
    ddebug "dump_fs _mp=$_mp"

if ! is_mounted "$_mp"; then
        dinfo "dump path \"$_mp\" is not mounted, trying to mount..."
        mount --target $_mp
        if [ $? -ne 0 ]; then
            derror "failed to dump to \"$_mp\", it's not a mount point!"
            return 1
        fi
    fi

# Remove -F in makedumpfile case. We don't want a flat format dump here.
    [[ $CORE_COLLECTOR = *makedumpfile* ]] && CORE_COLLECTOR=`echo $CORE_COLLECTOR | sed -e "s/-F//g"`

dinfo "saving to $_mp/$KDUMP_PATH/$HOST_IP-$DATEDIR/"

mount -o remount,rw $_mp || return 1
    mkdir -p $_mp/$KDUMP_PATH/$HOST_IP-$DATEDIR || return 1

save_vmcore_dmesg_fs ${DMESG_COLLECTOR} "$_mp/$KDUMP_PATH/$HOST_IP-$DATEDIR/"
    save_opalcore_fs "$_mp/$KDUMP_PATH/$HOST_IP-$DATEDIR/"

dinfo "saving vmcore"
    $CORE_COLLECTOR /proc/vmcore $_mp/$KDUMP_PATH/$HOST_IP-$DATEDIR/vmcore-incomplete
    _exitcode=$?
    if [ $_exitcode -eq 0 ]; then
        sync -f "$_mp/$KDUMP_PATH/$HOST_IP-$DATEDIR/vmcore-incomplete"
        _sync_exitcode=$?
        if [ $_sync_exitcode -eq 0 ]; then
            mv "$_mp/$KDUMP_PATH/$HOST_IP-$DATEDIR/vmcore-incomplete" "$_mp/$KDUMP_PATH/$HOST_IP-$DATEDIR/vmcore"
            dinfo "saving vmcore complete"
        else
            derror "sync vmcore failed, _exitcode:$_sync_exitcode"
            return 1
        fi
    else
        derror "saving vmcore failed, _exitcode:$_exitcode"
    fi

dinfo "saving the $KDUMP_LOG_FILE to $_mp/$KDUMP_PATH/$HOST_IP-$DATEDIR/"
    save_log
    mv $KDUMP_LOG_FILE $_mp/$KDUMP_PATH/$HOST_IP-$DATEDIR/
    if [ $_exitcode -ne 0 ]; then
        return 1
    fi

# improper kernel cmdline can cause the failure of echo, we can ignore this kind of failure
    return 0
}

save_vmcore_dmesg_fs() {
    local _dmesg_collector=$1
    local _path=$2

dinfo "saving vmcore-dmesg.txt to ${_path}"
    $_dmesg_collector /proc/vmcore > ${_path}/vmcore-dmesg-incomplete.txt
    _exitcode=$?
    if [ $_exitcode -eq 0 ]; then
        mv ${_path}/vmcore-dmesg-incomplete.txt ${_path}/vmcore-dmesg.txt
        chmod 600 ${_path}/vmcore-dmesg.txt

# Make sure file is on disk. There have been instances where later
        # saving vmcore failed and system rebooted without sync and there
        # was no vmcore-dmesg.txt available.
        sync
        dinfo "saving vmcore-dmesg.txt complete"
    else
        derror "saving vmcore-dmesg.txt failed"
    fi
}

save_opalcore_fs() {
    local _path=$1

if [ ! -f $OPALCORE ]; then
        # Check if we are on an old kernel that uses a different path
        if [ -f /sys/firmware/opal/core ]; then
            OPALCORE="/sys/firmware/opal/core"
        else
            return 0
        fi
    fi

dinfo "saving opalcore:$OPALCORE to ${_path}/opalcore"
    cp $OPALCORE ${_path}/opalcore
    if [ $? -ne 0 ]; then
        derror "saving opalcore failed"
        return 1
    fi

sync
    dinfo "saving opalcore complete"
    return 0
}

dump_to_rootfs()
{

dinfo "Trying to bring up rootfs device"
    systemctl start dracut-initqueue
    dinfo "Waiting for rootfs mount, will timeout after 90 seconds"
    systemctl start sysroot.mount

ddebug "NEWROOT=$NEWROOT"

dump_fs $NEWROOT
}

kdump_emergency_shell()
{
    echo "PS1=\"kdump:\\\${PWD}# \"" >/etc/profile
    ddebug "Switching to dracut emergency..."
    /bin/dracut-emergency
    rm -f /etc/profile
}

do_failure_action()
{
    dinfo "Executing failure action $FAILURE_ACTION"
    eval $FAILURE_ACTION
}

do_final_action()
{
    dinfo "Executing final action $FINAL_ACTION"
    eval $FINAL_ACTION
}
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