kexec-tools/mkdumprd
Dave Young 631d979eb3 drop dracut duplicate functions
We maintained several kdump specific functions which are duplicate with the
similar versions in dracut,  Dracut upstream splitted dracut init stuff from
dracut-functions.sh so that we can source it now.

Notes about kdump_get_presistent_dev:
Dracut now has a persistent_policy feature, for kdump when we dump to
raw disks we do not care the filesystem uuid and labels so we prefer to
search disk id instead. For raw disk set the persistent_policy before calling
get_persistent_dev ensure kdump logic still work.

Tested filesystem and raw dump in kvm guests.

[Xunlei: drop other functions other than get_persistent_dev.]

Signed-off-by: Dave Young <dyoung@redhat.com>
Reviewed-by: Xunlei Pang <xlpang@redhat.com>
2016-11-28 10:41:22 +08:00

521 lines
14 KiB
Bash

#!/bin/bash --norc
# New mkdumprd
#
# Copyright 2011 Red Hat, Inc.
#
# Written by Cong Wang <amwang@redhat.com>
#
[[ $dracutbasedir ]] || dracutbasedir=/usr/lib/dracut
. $dracutbasedir/dracut-functions.sh
. /lib/kdump/kdump-lib.sh
export IN_KDUMP=1
conf_file="/etc/kdump.conf"
SSH_KEY_LOCATION="/root/.ssh/kdump_id_rsa"
SAVE_PATH=$(grep ^path $conf_file| cut -d' ' -f2)
[ -z "$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=("--hostonly" "-o" "plymouth dash resume ifcfg" $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" "$1"
}
target_is_root() {
local _t
_t=$(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=$1 _source _target _fstype _options _mntopts _pdev
_source=$(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 $_dev)
[ -z "$_options" ] && _options=$(findmnt -k -f -n -r -o OPTIONS $_dev)
# with 'noauto' in fstab nfs and non-root disk mount will fail in 2nd
# kernel, filter it out here.
_options=$(echo $_options | sed 's/noauto//')
_options=${_options/#ro/rw} #mount fs target as rw in 2nd kernel
# "x-initrd.mount" mount failure will trigger isolate emergency service
# W/o this, systemd won't isolate, thus we won't get to emergency.
# This is not applicable to remote fs mount, because if we use
# "x-initrd.mount", remote mount will become required by
# "initrd-root-fs.target", instead of "remote-fs.target". That's how it is
# handled within systemd internal. We need remote mount to be required
# "remote-fs.target", because we need to bring up network before any remote
# mount and "remote-fs.target" can be a checkpoint of that.
# If remote mount fails, dracut-initqueue will still start and once
# dracut-initqueue finishes, kdump service will start. Because remote mount
# failed, kdump service will fail and it will lead to kdump error handler.
if ! is_nfs_dump_target; then
_options="$_options,x-initrd.mount"
fi
_mntopts="$_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() {
if ! target_is_root "$1"; then
local _mnt=$(to_mount "$1")
if [ $? -ne 0 ]; then
exit 1
fi
add_dracut_mount "$_mnt"
fi
}
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)
}
#handle the case user does not specify the dump target explicitly
handle_default_dump_target()
{
local _target
local _mntpoint
local _fstype
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/$SAVE_PATH
fi
if [ "$_mntpoint" != "/" ]; then
SAVE_PATH=${SAVE_PATH##"$_mntpoint"}
_fstype=$(get_fs_type_from_target $_target)
add_mount "$_target"
check_size fs $_target
fi
}
get_default_action_target()
{
local _target
local _action=$(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 $config_val is probably not mounted."
fi
_absolute_save_path=$(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
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 < $conf_file
handle_default_dump_target
if [ -n "$extra_modules" ]
then
add_dracut_arg "--add-drivers" "$extra_modules"
fi
dracut "${dracut_args[@]}" "$@"
_rc=$?
sync
exit $_rc