kexec-tools/mkdumprd
Baoquan He 2afbb51946 mkdumprd: reorganize the code to make flow of script clear
Move the invocation of check_resettable() to be together with all
other invocation of functions. This can make the flow of script
clearer and more readable.

Signed-off-by: Baoquan He <bhe@redhat.com>
Acked-by: Vivek Goyal <vgoyal@redhat.com>
2014-03-10 13:17:39 +08:00

567 lines
14 KiB
Bash

#!/bin/bash --norc
# New mkdumprd
#
# Copyright 2011 Red Hat, Inc.
#
# Written by Cong Wang <amwang@redhat.com>
#
. /lib/kdump/kdump-lib.sh
export IN_KDUMP=1
conf_file="/etc/kdump.conf"
SSH_KEY_LOCATION="/root/.ssh/kdump_id_rsa"
SAVE_PATH=$(grep ^path $conf_file| cut -d' ' -f2)
[ -z "$SAVE_PATH" ] && SAVE_PATH="/var/crash"
extra_modules=""
dracut_args=("--hostonly" "-o" "plymouth dash")
OVERRIDE_RESETTABLE=0
perror_exit() {
echo $@ >&2
exit 1
}
perror() {
echo $@ >&2
}
get_persistent_dev() {
local i _tmp _dev
_dev=$(udevadm info --query=name --name="$1" 2>/dev/null)
[ -z "$_dev" ] && {
perror_exit "Kernel dev name of $1 is not found."
}
for i in /dev/mapper/* /dev/disk/by-uuid/* /dev/disk/by-id/*; do
_tmp=$(udevadm info --query=name --name="$i" 2>/dev/null)
if [ "$_tmp" = "$_dev" ]; then
echo $i
return
fi
done
perror "WARNING: Persistent device name of $1 not found. Using $1 as dump target name"
echo $1
}
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"
}
# Generic substring function. If $2 is in $1, return 0.
strstr() { [[ $1 =~ $2 ]]; }
target_is_root() {
local _t
_t=$(findmnt -k -n -r -o TARGET $1|sort|head -1)
[ "$_t" = "/" ]
}
# caller should ensure $1 is valid and mounted in 1st kernel
to_mount() {
local _dev=$1 _s _t _o _mntopts _pdev
_s=$(findmnt -k -f -n -r -o SOURCE $_dev)
_t=$(findmnt -k -f -n -r -o TARGET,FSTYPE $_dev)
_o=$(findmnt -k -f -n -r -o OPTIONS $_dev)
_o=${_o/#ro/rw} #mount fs target as rw in 2nd kernel
_o="${_o},nofail" #with nofail set, systemd won't block for mount failure
_mntopts="$_t $_o"
#for non-nfs _dev converting to use udev persistent name
if [ -b "$_s" ]; then
_pdev="$(get_persistent_dev $_s)"
if [ $? -ne 0 ]; then
return 1
fi
else
_pdev=$_dev
fi
echo "$_pdev $_mntopts"
}
to_mount_point() {
echo $(findmnt -k -f -n -r -o TARGET $1)
}
is_readonly_mount() {
local _mnt
_mnt=$(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 $11 instead of $4
_size=$(echo -n $_out|tail -1 | awk '{print $11}')
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
}
#mkdir if save path does not exist on dump target filesystem
#$1=dump target
#caller should ensure $1 is mounted
mkdir_save_path_fs() {
local _mnt=$(to_mount_point $1)
local _remount="no"
local _ret
[ ! -d ${_mnt}/$SAVE_PATH ] && {
if is_readonly_mount $1; then
echo "Mounting $1 as read-write for creating dump directory.."
mount -o remount,rw $1 || {
perror_exit "Mounting $1 as read-write failed."
}
_remount="yes"
fi
mkdir -p ${_mnt}/$SAVE_PATH
_ret=$?
[ "$_remount" = "yes" ] && {
echo "Remounting $1 as read-only."
mount -o remount,ro $1 || {
perror_exit "Remounting $1 as read-only failed."
}
}
[ $_ret -ne 0 ] && {
perror_exit "Creating ${_mnt}/$SAVE_PATH failed."
}
}
}
#Function: get_fs_size
#$1=dump target
get_fs_size() {
local _mnt=$(to_mount_point $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() {
if ! target_is_root "$1"; then
local _mnt=$(to_mount "$1")
if [ $? -ne 0 ]; then
exit 1
fi
add_dracut_mount "$_mnt"
fi
}
# get_maj_min <device>
# Prints the major and minor of a device node.
# Example:
# $ get_maj_min /dev/sda2
# 8:2
get_maj_min() {
local _dev
_dev=$(stat -L -c '$((0x%t)):$((0x%T))' "$1" 2>/dev/null)
_dev=$(eval "echo $_dev")
echo $_dev
}
# ugly workaround for the lvm design
# There is no volume group device,
# so, there are no slave devices for volume groups.
# Logical volumes only have the slave devices they really live on,
# but you cannot create the logical volume without the volume group.
# And the volume group might be bigger than the devices the LV needs.
check_vol_slaves() {
local _lv _vg _pv
for i in /dev/mapper/*; do
_lv=$(get_maj_min $i)
if [[ $_lv = $2 ]]; then
_vg=$(lvm lvs --noheadings -o vg_name $i 2>/dev/null)
# strip space
_vg=$(echo $_vg)
if [[ $_vg ]]; then
for _pv in $(lvm vgs --noheadings -o pv_name "$_vg" 2>/dev/null)
do
check_block_and_slaves $1 $(get_maj_min $_pv) && return 0
done
fi
fi
done
return 1
}
# Walk all the slave relationships for a given block device.
# Stop when our helper function returns success
# $1 = function to call on every found block device
# $2 = block device in major:minor format
check_block_and_slaves() {
local _x
[[ -b /dev/block/$2 ]] || return 1 # Not a block device? So sorry.
"$1" $2 && return
check_vol_slaves "$@" && return 0
if [[ -f /sys/dev/block/$2/../dev ]]; then
check_block_and_slaves $1 $(cat "/sys/dev/block/$2/../dev") && return 0
fi
[[ -d /sys/dev/block/$2/slaves ]] || return 1
for _x in /sys/dev/block/$2/slaves/*/dev; do
[[ -f $_x ]] || continue
check_block_and_slaves $1 $(cat "$_x") && return 0
done
return 1
}
to_dev_name() {
local dev="${1//\"/}"
case "$dev" in
UUID=*)
dev=`blkid -U "${dev#UUID=}"`
;;
LABEL=*)
dev=`blkid -L "${dev#LABEL=}"`
;;
esac
echo $dev
}
get_block_dump_target()
{
local _target
_target=$(get_user_configured_dump_disk)
[ -n "$_target" ] && echo $(to_dev_name $_target) && return
#get rootfs device name
_target=$(get_root_fs_device)
[ -b "$_target" ] && echo $(to_dev_name $_target)
}
get_default_action_target()
{
local _target
local _action=$(grep "^default" /etc/kdump.conf 2>/dev/null | awk '{print $2}')
if [ -n "$_action" ] && [ "$_action" = "dump_to_rootfs" ]; then
#get rootfs device name
_target=$(findmnt -k -f -n -o SOURCE /)
[ -b "$_target" ] && echo $(to_dev_name $_target)
fi
return
}
get_override_resettable()
{
local override_resettable
override_resettable=$(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
}
# $1: function name
for_each_block_target()
{
local dev majmin
#check dump target
dev=$(get_block_dump_target)
if [ -n "$dev" ]; then
majmin=$(get_maj_min $dev)
check_block_and_slaves $1 $majmin && return 1
fi
#check rootfs when default action dump_to_rootfs is set
dev=$(get_default_action_target)
if [ -n "$dev" ]; then
majmin=$(get_maj_min $dev)
check_block_and_slaves $1 $majmin && return 2
fi
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 "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
if [ $_ret -eq 1 ]; then
_target=$(get_block_dump_target)
perror "Can not save vmcore to target device $_target . This device can not be initialized in kdump kernel as it is not resettable"
elif [ $_ret -eq 2 ]; then
_target=$(get_default_action_target)
perror "Rootfs device $_target is not resettable, can not be used as the default target, please specify a default action"
fi
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.
config_val=$(strip_comments $config_val)
case "$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 $config_val is probably not mounted."
fi
if [ "$config_opt" = "nfs" ]; then
add_dracut_module "nfs"
fi
add_mount "$config_val"
mkdir_save_path_fs $config_val
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 $config_val"
}
_praw=$(get_persistent_dev $config_val)
if [ $? -ne 0 ]; then
exit 1
fi
add_dracut_arg "--device" "$_praw"
check_size raw $config_val
;;
ssh)
if strstr "$config_val" "@";
then
check_size ssh $config_val
mkdir_save_path_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
;;
*)
if [ -n $(echo $config_opt | grep "^#.*$") ]
then
continue
fi
;;
esac
done < $conf_file
if [ -n "$extra_modules" ]
then
add_dracut_arg "--add-drivers" "$extra_modules"
fi
dracut "${dracut_args[@]}" "$@"
_rc=$?
sync
exit $_rc