kexec-tools/mkdumprd
Kairui Song 43ea36b3e8 Introduce get_kdump_mntpoint_from_target and fix duplicated /
User a helper to get the path to mount dump target in kdump kernel, and
fix duplicated '/' in the mount path problem.

Fixes: bz1785371
Signed-off-by: Kairui Song <kasong@redhat.com>
Acked-by: Dave Young <dyoung@redhat.com>
2020-05-22 16:13:02 +08:00

432 lines
11 KiB
Bash

#!/bin/bash --norc
# New mkdumprd
#
# Copyright 2011 Red Hat, Inc.
#
# Written by Cong Wang <amwang@redhat.com>
#
[[ $dracutbasedir ]] || dracutbasedir=/usr/lib/dracut
. $dracutbasedir/dracut-functions.sh
. /lib/kdump/kdump-lib.sh
export IN_KDUMP=1
conf_file="/etc/kdump.conf"
SSH_KEY_LOCATION="/root/.ssh/kdump_id_rsa"
SAVE_PATH=$(get_save_path)
OVERRIDE_RESETTABLE=0
extra_modules=""
dracut_args="--quiet --hostonly --hostonly-cmdline --hostonly-i18n --hostonly-mode strict -o \"plymouth dash resume ifcfg earlykdump\""
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")
[[ "$active" = "active" ]] && return 0
done
return 1
}
add_dracut_arg() {
dracut_args="$dracut_args $@"
}
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=$1 _source _new_mntpoint _fstype _options _mntopts _pdev
_source=$(findmnt -k -f -n -r -o SOURCE $_dev)
_fstype=$(findmnt -k -f -n -r -o FSTYPE $_dev)
_new_mntpoint=$(get_kdump_mntpoint_from_target $_dev)
[[ -e /etc/fstab ]] && _options=$(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')
# 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')
# drop nofail or nobootwait
_options=$(echo $_options | sed 's/\(^\|,\)nofail\($\|,\)/\1/g')
_options=$(echo $_options | sed 's/\(^\|,\)nobootwait\($\|,\)/\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="$_options,nofail,x-systemd.before=initrd-fs.target"
_mntopts="$_new_mntpoint $_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 $1:$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
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
}
# $1: core_collector config value
verify_core_collector() {
local _cmd="${1%% *}"
local _params="${1#* }"
if [ "$_cmd" != "makedumpfile" ]; then
if is_raw_dump_target; then
echo "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 "$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 $SAVE_PATH
_save_path=$(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}')
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
if is_wdt_addition_needed; then
add_dracut_arg "-a" "watchdog"
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
# User configured target, use $SAVE_PATH as the dump path within the target
check_save_path_user_configured "$config_val" "$SAVE_PATH"
check_size fs "$config_val"
add_mount "$config_val"
;;
raw)
# checking raw disk writable
dd if=$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 $(get_root_fs_device))"
add_dracut_arg "--no-hostonly-default-device"
fi
echo "$dracut_args $@" | xargs dracut
_rc=$?
sync
exit $_rc