#!/bin/bash --norc

# New mkdumprd

#

# Copyright 2011 Red Hat, Inc.

#

# Written by Cong Wang <amwang@redhat.com>

#

[[ $dracutbasedir ]] || dracutbasedir=/usr/lib/dracut

. $dracutbasedir/dracut-functions.sh

. /lib/kdump/kdump-lib.sh

export IN_KDUMP=1

conf_file="/etc/kdump.conf"

SSH_KEY_LOCATION="/root/.ssh/kdump_id_rsa"

SAVE_PATH=$(awk '/^path/ {print $2}' $conf_file)

[ -z "$SAVE_PATH" ] && SAVE_PATH=$DEFAULT_PATH

# strip the duplicated "/"

SAVE_PATH=$(echo $SAVE_PATH | tr -s /)

is_wdt_addition_needed() {

	local active

	is_wdt_mod_omitted

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

	[[ -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

}

WDTCFG=""

is_wdt_addition_needed

[[ $? -eq 0 ]] && WDTCFG="-a watchdog"

extra_modules=""

dracut_args=("--quiet" "--hostonly" "--hostonly-cmdline" "--hostonly-i18n" "--hostonly-mode" "strict" "-o" "plymouth dash resume ifcfg earlykdump" $WDTCFG)

OVERRIDE_RESETTABLE=0

add_dracut_arg() {

    local arg qarg is_quoted=0

    while [ $# -gt 0 ];

    do

        arg="${1//\'/\"}"

        #Handle quoted substring properly for passing it to dracut_args array.

        if [ $is_quoted -eq 0 ]; then

            if [[ "$arg" == "\"" ]] || [[ $arg != ${arg#\"} ]]; then

                is_quoted=1

                arg=${arg#\"}

            fi

        fi

        if [ $is_quoted -eq 1 ]; then

            qarg="$qarg $arg"

            if [[ "$arg" == "\"" ]] || [[ $arg != ${arg%\"} ]]; then

                is_quoted=0

                arg=${qarg%\"}

                qarg=""

            else

                shift

                continue

            fi

        fi

        dracut_args+=("$arg")

        shift

    done

}

add_dracut_module() {

    add_dracut_arg "--add" "$1"

}

add_dracut_mount() {

    add_dracut_arg "--mount" "$1"

}

add_dracut_sshkey() {

    add_dracut_arg "--sshkey" "$1"

}

# caller should ensure $1 is valid and mounted in 1st kernel

to_mount() {

    local _dev=$1 _source _target _fstype _options _mntopts _pdev

    _source=$(findmnt -k -f -n -r -o SOURCE $_dev)

    _target=$(get_mntpoint_from_target $_dev)

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

    #/kdumproot/$_target in other cases in 2nd kernel. systemd

    #will be in charge to umount it.

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

        _target="/sysroot"

    else

        _target="/kdumproot/$_target"

    fi

    _fstype=$(findmnt -k -f -n -r -o FSTYPE $_dev)

    [[ -e /etc/fstab ]] && _options=$(findmnt --fstab -f -n -r -o OPTIONS $_dev)

    if [ -z "$_options" ]; then

        _options=$(findmnt -k -f -n -r -o OPTIONS $_dev)

        if [[ $_fstype == "nfs"* ]]; then

            _options=$(echo $_options | sed 's/,addr=[^,]*//')

            _options=$(echo $_options | sed 's/,proto=[^,]*//')

            _options=$(echo $_options | sed 's/,clientaddr=[^,]*//')

        fi

    fi

    #mount fs target as rw in 2nd kernel

    _options=$(echo $_options | sed 's/\(^\|,\)ro\($\|,\)/\1rw\2/g')

    # filter out 'noauto' here, it will be force appended later, avoid duplication

    _options=$(echo $_options | sed 's/\(^\|,\)noauto\($\|,\)/\1/g')

    # only mount the dump target when needed.

    _options="$_options,noauto"

    _mntopts="$_target $_fstype $_options"

    #for non-nfs _dev converting to use udev persistent name

    if [ -b "$_source" ]; then

        _pdev="$(get_persistent_dev $_source)"

        if [ -z "$_pdev" ]; then

            return 1

        fi

    else

        _pdev=$_dev

    fi

    echo "$_pdev $_mntopts"

}

is_readonly_mount() {

    local _mnt

    _mnt=$(findmnt -k -f -n -r -o OPTIONS $1)

    #fs/proc_namespace.c: show_mountinfo():

    #seq_puts(m, mnt->mnt_flags & MNT_READONLY ? " ro" : " rw");

    [[ "$_mnt" =~ ^ro ]]

}

#Function: get_ssh_size

#$1=dump target

#called from while loop and shouldn't read from stdin, so we're using "ssh -n"

get_ssh_size() {

    local _opt _out _size

    _opt="-i $SSH_KEY_LOCATION -o BatchMode=yes -o StrictHostKeyChecking=yes"

    _out=$(ssh -q -n $_opt $1 "df -P $SAVE_PATH")

    [ $? -ne 0 ] && {

        perror_exit "checking remote ssh server available size failed."

    }

    #ssh output removed the line break, so print field NF-2

    _size=$(echo -n $_out| awk '{avail=NF-2; print $avail}')

    echo -n $_size

}

#mkdir if save path does not exist on ssh dump target

#$1=ssh dump target

#caller should ensure write permission on $DUMP_TARGET:$SAVE_PATH

#called from while loop and shouldn't read from stdin, so we're using "ssh -n"

mkdir_save_path_ssh()

{

    local _opt _dir

    _opt="-i $SSH_KEY_LOCATION -o BatchMode=yes -o StrictHostKeyChecking=yes"

    ssh -qn $_opt $1 mkdir -p $SAVE_PATH 2>&1 > /dev/null

    _ret=$?

    if [ $_ret -ne 0 ]; then

        perror_exit "mkdir failed on $DUMP_TARGET:$SAVE_PATH"

    fi

    #check whether user has write permission on $SAVE_PATH/$DUMP_TARGET

    _dir=$(ssh -qn $_opt $1 mktemp -dqp $SAVE_PATH 2>/dev/null)

    _ret=$?

    if [ $_ret -ne 0 ]; then

        perror_exit "Could not create temporary directory on $DUMP_TARGET:$SAVE_PATH. Make sure user has write permission on destination"

    fi

    ssh -qn $_opt $1 rmdir $_dir

    return 0

}

#Function: get_fs_size

#$1=dump target

get_fs_size() {

    local _mnt=$(get_mntpoint_from_target $1)

    echo -n $(df -P "${_mnt}/$SAVE_PATH"|tail -1|awk '{print $4}')

}

#Function: get_raw_size

#$1=dump target

get_raw_size() {

        echo -n $(fdisk -s "$1")

}

#Function: check_size

#$1: dump type string ('raw', 'fs', 'ssh')

#$2: dump target

check_size() {

    local avail memtotal

    memtotal=$(awk '/MemTotal/{print $2}' /proc/meminfo)

    case "$1" in

        raw)

            avail=$(get_raw_size "$2")

            ;;

        ssh)

            avail=$(get_ssh_size "$2")

            ;;

        fs)

            avail=$(get_fs_size "$2")

            ;;

        *)

            return

    esac

    if [ $? -ne 0 ]; then

            perror_exit "Check dump target size failed"

    fi

    if [ $avail -lt $memtotal ]; then

        echo "Warning: There might not be enough space to save a vmcore."

        echo "         The size of $2 should be greater than $memtotal kilo bytes."

    fi

}

# $1: core_collector config value

verify_core_collector() {

    if grep -q "^raw" $conf_file && [ "${1%% *}" != "makedumpfile" ]; then

        echo "Warning: specifying a non-makedumpfile core collector, you will have to recover the vmcore manually."

    fi

    if is_ssh_dump_target || is_raw_dump_target; then

        if [ "${1%% *}" = "makedumpfile" ]; then

            ! strstr "$1" "-F" && {

                perror_exit "The specified dump target needs makedumpfile \"-F\" option."

            }

        fi

    fi

}

add_mount() {

    local _mnt=$(to_mount "$1")

    if [ $? -ne 0 ]; then

        exit 1

    fi

    add_dracut_mount "$_mnt"

}

#handle the case user does not specify the dump target explicitly

handle_default_dump_target()

{

    local _target

    local _mntpoint

    is_user_configured_dump_target && return

    check_save_path_fs $SAVE_PATH

    _mntpoint=$(get_mntpoint_from_path $SAVE_PATH)

    _target=$(get_target_from_path $SAVE_PATH)

    if is_atomic && is_bind_mount $_mntpoint; then

        SAVE_PATH=${SAVE_PATH##"$_mntpoint"}

        # the real dump path in the 2nd kernel, if the mount point is bind mounted.

        SAVE_PATH=$(get_bind_mount_directory $_mntpoint)/$SAVE_PATH

        _mntpoint=$(get_mntpoint_from_target $_target)

        # the absolute path in the 1st kernel

        SAVE_PATH=$_mntpoint/$SAVE_PATH

    fi

    SAVE_PATH=${SAVE_PATH##"$_mntpoint"}

    add_mount "$_target"

    check_size fs $_target

}

get_override_resettable()

{

    local override_resettable

    override_resettable=$(grep "^override_resettable" $conf_file)

    if [ -n "$override_resettable" ]; then

        OVERRIDE_RESETTABLE=$(echo $override_resettable | cut -d' '  -f2)

        if [ "$OVERRIDE_RESETTABLE" != "0" ] && [ "$OVERRIDE_RESETTABLE" != "1" ];then

            perror_exit "override_resettable value $OVERRIDE_RESETTABLE is invalid"

        fi

    fi

}

# $1: function name

for_each_block_target()

{

    local dev majmin

    for dev in $(get_kdump_targets); do

        [ -b "$dev" ] || continue

        majmin=$(get_maj_min $dev)

        check_block_and_slaves $1 $majmin && return 1

    done

    return 0

}

#judge if a specific device with $1 is unresettable

#return false if unresettable.

is_unresettable()

{

    local path="/sys/$(udevadm info --query=all --path=/sys/dev/block/$1 | awk '/^P:/ {print $2}' | sed -e 's/\(cciss[0-9]\+\/\).*/\1/g' -e 's/\/block\/.*$//')/resettable"

    local resettable=1

    if [ -f "$path" ]

    then

        resettable="$(cat $path)"

        [ $resettable -eq 0 -a "$OVERRIDE_RESETTABLE" -eq 0 ] && {

            local device=$(udevadm info --query=all --path=/sys/dev/block/$1 | awk -F= '/DEVNAME/{print $2}')

            echo "Error: Can not save vmcore because device $device is unresettable"

            return 0

        }

    fi

    return 1

}

#check if machine is resettable.

#return true if resettable

check_resettable()

{

    local _ret _target

    get_override_resettable

    for_each_block_target is_unresettable

    _ret=$?

    [ $_ret -eq 0 ] && return

    return 1

}

# $1: maj:min

is_crypt()

{

    local majmin=$1 dev line ID_FS_TYPE=""

    line=$(udevadm info --query=property --path=/sys/dev/block/$majmin \

            | grep "^ID_FS_TYPE")

    eval "$line"

    [[ "$ID_FS_TYPE" = "crypto_LUKS" ]] && {

        dev=$(udevadm info --query=all --path=/sys/dev/block/$majmin | awk -F= '/DEVNAME/{print $2}')

        echo "Device $dev is encrypted."

        return 0

    }

    return 1

}

check_crypt()

{

    local _ret _target

    for_each_block_target is_crypt

    _ret=$?

    [ $_ret -eq 0 ] && return

    return 1

}

if ! check_resettable; then

    exit 1

fi

if ! check_crypt; then

    echo "Warning: Encrypted device is in dump path. User will prompted for password during second kernel boot." 

fi

# firstly get right SSH_KEY_LOCATION

keyfile=$(awk '/^sshkey/ {print $2}' $conf_file)

if [ -f "$keyfile" ]; then

    # canonicalize the path

    SSH_KEY_LOCATION=$(/usr/bin/readlink -m $keyfile)

fi

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

    add_dracut_module "znet"

fi

while read config_opt config_val;

do

    # remove inline comments after the end of a directive.

    case "$config_opt" in

    extra_modules)

        extra_modules="$extra_modules $config_val"

        ;;

    ext[234]|xfs|btrfs|minix|nfs)

        if ! findmnt $config_val >/dev/null; then

            perror_exit "Dump target $config_val is probably not mounted."

        fi

        _absolute_save_path=$(make_absolute_save_path $config_val)

        _mntpoint=$(get_mntpoint_from_path $_absolute_save_path)

        if is_atomic && is_bind_mount $_mntpoint; then

            SAVE_PATH=${_absolute_save_path##"$_mntpoint"}

            # the real dump path in the 2nd kernel, if the mount point is bind mounted.

            SAVE_PATH=$(get_bind_mount_directory $_mntpoint)/$SAVE_PATH

        fi

        add_mount "$config_val"

        check_save_path_fs $_absolute_save_path

        check_size fs $config_val

        ;;

    raw)

        #checking raw disk writable

        dd if=$config_val count=1 of=/dev/null > /dev/null 2>&1 || {

            perror_exit "Bad raw disk $config_val"

        }

        _praw=$(persistent_policy="by-id" get_persistent_dev $config_val)

        if [ -z "$_praw" ]; then

            exit 1

        fi

        add_dracut_arg "--device" "$_praw"

        check_size raw $config_val

        ;;

    ssh)

        if strstr "$config_val" "@";

        then

            mkdir_save_path_ssh $config_val

            check_size ssh $config_val

            add_dracut_module "ssh-client"

            add_dracut_sshkey "$SSH_KEY_LOCATION"

        else

            perror_exit "Bad ssh dump target $config_val"

        fi

        ;;

    core_collector)

        verify_core_collector "$config_val"

        ;;

    dracut_args)

        add_dracut_arg $config_val

        ;;

    *)

        ;;

    esac

done <<< "$(read_strip_comments $conf_file)"

handle_default_dump_target

if [ -n "$extra_modules" ]

then

    add_dracut_arg "--add-drivers" "$extra_modules"

fi

if ! is_fadump_capable; then

    # The 2nd rootfs mount stays behind the normal dump target mount,

    # so it doesn't affect the logic of check_dump_fs_modified().

    is_dump_to_rootfs && add_mount "$(to_dev_name $(get_root_fs_device))"

    add_dracut_arg "--no-hostonly-default-device"

fi

dracut "${dracut_args[@]}" "$@"

_rc=$?

sync

exit $_rc