| Current File : //sbin/mkdumprd |
#!/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 --hostonly-nics '' -o \"plymouth dash resume ifcfg earlykdump\" --compress=xz"
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/,\(mount\)\?addr=[^,]*//g')
_options=$(echo $_options | sed 's/,\(mount\)\?proto=[^,]*//g')
_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/$SAVE_PATH" ]; then
perror_exit "Dump path \"$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="${1#${_cmd}}"
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" \"$extra_modules\"
fi
# TODO: The below check is not needed anymore with the introduction of
# 'zz-fadumpinit' module, that isolates fadump's capture kernel initrd,
# but still sysroot.mount unit gets generated based on 'root=' kernel
# parameter available in fadump case. So, find a way to fix that first
# before removing this check.
if ! is_fadump_capable; then
# The 2nd rootfs mount stays behind the normal dump target mount,
# so it doesn't affect the logic of check_dump_fs_modified().
is_dump_to_rootfs && add_mount "$(to_dev_name $(get_root_fs_device))"
add_dracut_arg "--no-hostonly-default-device"
if fips-mode-setup --is-enabled 2> /dev/null; then
add_dracut_arg --add-device "$(findmnt -n -o SOURCE --target /boot)"
fi
fi
echo "$dracut_args $@" | xargs dracut