#!/bin/bash --norc

# New mkdumprd

#

# Copyright 2011 Red Hat, Inc.

#

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

#

if [ -f /etc/sysconfig/kdump ]; then

	. /etc/sysconfig/kdump

fi

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

. $dracutbasedir/dracut-functions.sh

. /lib/kdump/kdump-lib.sh

. /lib/kdump/kdump-logger.sh

export IN_KDUMP=1

#initiate the kdump logger

dlog_init

if [ $? -ne 0 ]; then

	echo "failed to initiate the kdump logger."

	exit 1

fi

conf_file="/etc/kdump.conf"

SSH_KEY_LOCATION="/root/.ssh/kdump_id_rsa"

SAVE_PATH=$(get_save_path)

OVERRIDE_RESETTABLE=0

extra_modules=""

dracut_args="--add kdumpbase --quiet --hostonly --hostonly-cmdline --hostonly-i18n --hostonly-mode strict -o \"plymouth dash resume ifcfg earlykdump\""

readonly MKDUMPRD_TMPDIR="$(mktemp -d -t mkdumprd.XXXXXX)"

[ -d "$MKDUMPRD_TMPDIR" ] || perror_exit "dracut: mktemp -p -d -t dracut.XXXXXX failed."

readonly MKDUMPRD_TMPMNT="$MKDUMPRD_TMPDIR/target"

trap '

    ret=$?;

    is_mounted $MKDUMPRD_TMPMNT && umount -f $MKDUMPRD_TMPMNT;

    [[ -d $MKDUMPRD_TMPDIR ]] && rm --one-file-system -rf -- "$MKDUMPRD_TMPDIR";

    exit $ret;

    ' EXIT

# clean up after ourselves no matter how we die.

trap 'exit 1;' SIGINT

add_dracut_arg() {

    dracut_args="$dracut_args $@"

}

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 _target=$1 _fstype=$2 _options=$3 _new_mntpoint _pdev

    _new_mntpoint=$(get_kdump_mntpoint_from_target $_target)

    _fstype="${_fstype:-$(get_fs_type_from_target $_target)}"

    _options="${_options:-$(get_mntopt_from_target $_target)}"

    _options="${_options:-defaults}"

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

        _pdev=$_target

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

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

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

    else

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

        _pdev="$(kdump_get_persistent_dev $_target)"

        if [ -z "$_pdev" ]; then

            return 1

        fi

    fi

    #mount fs target as rw in 2nd kernel

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

    # with 'noauto' in fstab nfs and non-root disk mount will fail in 2nd

    # kernel, filter it out here.

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

    # use both nofail and x-systemd.before to ensure systemd will try best to

    # mount it before kdump starts, this is an attempt to improve robustness

    _options="$_options,nofail,x-systemd.before=initrd-fs.target"

    echo "$_pdev $_new_mntpoint $_fstype $_options"

}

#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 $1:$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 $1:$SAVE_PATH"

    fi

    #check whether user has write permission on $1:$SAVE_PATH

    _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 $1:$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

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

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

    fi

}

check_save_path_fs()

{

    local _path=$1

    if [ ! -d $_path ]; then

        perror_exit "Dump path $_path does not exist."

    fi

}

check_user_configured_target()

{

    local _target=$1 _cfg_fs_type=$2 _mounted

    local _mnt=$(get_mntpoint_from_target $_target)

    local _opt=$(get_mntopt_from_target $_target)

    local _fstype=$(get_fs_type_from_target $_target)

    if [ -n "$_fstype" ]; then

        # In case of nfs4, nfs should be used instead, nfs* options is deprecated in kdump.conf

        [[ $_fstype = "nfs"* ]] && _fstype=nfs

        if [ -n "$_cfg_fs_type" ] && [ "$_fstype" != "$_cfg_fs_type" ]; then

            perror_exit "\"$_target\" have a wrong type config \"$_cfg_fs_type\", expected \"$_fstype\""

        fi

    else

        _fstype="$_cfg_fs_type"

        _fstype="$_cfg_fs_type"

    fi

    # For noauto mount, mount it inplace with default value.

    # Else use the temporary target directory

    if [ -n "$_mnt" ]; then

        if ! is_mounted "$_mnt"; then

            if [[ $_opt  = *",noauto"* ]]; then

                mount $_mnt

                [ $? -ne 0 ] && perror_exit "Failed to mount $_target on $_mnt for kdump preflight check."

                _mounted=$_mnt

            else

                perror_exit "Dump target \"$_target\" is neither mounted nor configured as \"noauto\""

            fi

        fi

    else

        _mnt=$MKDUMPRD_TMPMNT

        mkdir -p $_mnt

        mount $_target $_mnt -t $_fstype -o defaults

        [ $? -ne 0 ] && perror_exit "Failed to mount $_target for kdump preflight check."

        _mounted=$_mnt

    fi

    # For user configured target, use $SAVE_PATH as the dump path within the target

    if [ ! -d "$_mnt/$SAVE_PATH" ]; then

        perror_exit "Dump path \"$_mnt/$SAVE_PATH\" does not exist in dump target \"$_target\""

    fi

    check_size fs "$_target"

    # Unmount it early, if function is interrupted and didn't reach here, the shell trap will clear it up anyway

    if [ -n "$_mounted" ]; then

        umount -f -- $_mounted

    fi

}

# $1: core_collector config value

verify_core_collector() {

    local _cmd="${1%% *}"

    local _params="${1#* }"

    if [ "$_cmd" != "makedumpfile" ]; then

        if is_raw_dump_target; then

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

        fi

        return

    fi

    if is_ssh_dump_target || is_raw_dump_target; then

        if ! strstr "$_params" "-F"; then

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

        fi

        _params="$_params vmcore"

    else

        _params="$_params vmcore dumpfile"

    fi

    if ! $_cmd --check-params $_params; then

        perror_exit "makedumpfile parameter check failed."

    fi

}

add_mount() {

    local _mnt=$(to_mount $@)

    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

    _save_path=$(get_bind_mount_source $SAVE_PATH)

    _target=$(get_target_from_path $_save_path)

    _mntpoint=$(get_mntpoint_from_target $_target)

    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}')

            derror "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

}

check_crypt()

{

    local _dev

    for _dev in $(get_kdump_targets); do

        if [[ -n $(get_luks_crypt_dev "$(get_maj_min "$_dev")") ]]; then

            derror "Device $_dev is encrypted." && return 1

        fi

    done

}

if ! check_resettable; then

    exit 1

fi

if ! check_crypt; then

    dwarn "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

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)

        check_user_configured_target "$config_val" "$config_opt"

        add_mount "$config_val" "$config_opt"

        ;;

    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" kdump_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_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

echo "$dracut_args $@" | xargs dracut

_rc=$?

sync

exit $_rc