kexec-tools/mkdumprd

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#!/bin/bash --norc
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# New mkdumprd
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#
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# Copyright 2011 Red Hat, Inc.
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#
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# Written by Cong Wang <amwang@redhat.com>
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#
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export IN_KDUMP=1
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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"
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extra_modules=""
dracut_args=("--hostonly" "-o" "plymouth dash")
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get_persistent_dev() {
local i _tmp _dev
_dev=$(udevadm info --query=name --name="$1" 2>/dev/null)
[ -z "$_dev" ] && {
echo "Kernel dev name of $1 is not found."
exit 1
}
for i in /dev/mapper/* /dev/disk/by-uuid/* /dev/disk/by-id/*; do
_tmp=$(udevadm info --query=name --name="$i" 2>/dev/null)
if [ "$_tmp" = "$_dev" ]; then
echo $i
return
fi
done
echo "Persistent device name of $1 is not found."
exit 1
}
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add_dracut_arg() {
while [ $# -gt 0 ];
do
dracut_args+=("$1")
shift
done
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}
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
_mntopts="$_t $_o"
#for non-nfs _dev converting to use udev persistent name
if [ -b "$_s" ]; then
_pdev="$(get_persistent_dev $_s)"
else
_pdev=$_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
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")
if [ $? -ne 0 ]; then
echo "checking remote ssh server available size failed."
exit 1
fi
#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 dump target filesystem
#$1=dump target
#caller should ensure $1 is mounted
mkdir_save_path() {
local _mnt=$(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
[ $? -ne 0 ] && {
echo "Mounting $1 as read-write failed."
exit 1;
}
_remount="yes"
fi
mkdir -p ${_mnt}/$SAVE_PATH
_ret=$?
[ "$_remount" = "yes" ] && {
echo "Remounting $1 as read-only."
mount -o remount,ro $1 || {
echo "Remounting $1 as read-only failed."
exit 1
}
}
[ $_ret -ne 0 ] && {
echo "Creating ${_mnt}/$SAVE_PATH failed."
exit 1
}
}
}
#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 [ $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
}
is_ssh_dump_target()
{
grep -q "^ssh.*@" $conf_file
}
is_raw_dump_target()
{
grep -q "^raw" $conf_file
}
# $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" && {
echo "The specified dump target needs makedumpfile \"-F\" option."
exit 1
}
fi
fi
}
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add_mount() {
if ! target_is_root "$1"; then
local _mnt=$(to_mount "$1")
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add_dracut_mount "$_mnt"
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
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
echo "Dump target $config_val is probably not mounted."
exit 1
fi
if [ "$config_opt" = "nfs" ]; then
add_dracut_module "nfs"
fi
add_mount "$config_val"
mkdir_save_path $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 || {
echo "Bad raw disk $config_val"
exit 1
}
add_dracut_arg "--device" "$(get_persistent_dev $config_val)"
check_size raw $config_val
;;
ssh)
if strstr "$config_val" "@";
then
check_size ssh $config_val
add_dracut_module "ssh-client"
add_dracut_sshkey "$SSH_KEY_LOCATION"
else
echo "Bad ssh dump target $config_val"
exit 1
fi
;;
core_collector)
verify_core_collector "$config_val"
;;
blacklist)
add_dracut_arg "--omit-drivers" "$config_val"
;;
*)
if [ -n $(echo $config_opt | grep "^#.*$") ]
then
continue
fi
;;
esac
done < $conf_file
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if [ -n "$extra_modules" ]
then
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add_dracut_arg "--add-drivers" "$extra_modules"
fi
dracut "${dracut_args[@]}" -M "$@"
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_rc=$?
sync
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exit $_rc