#!/bin/sh

#

# The main kdump routine in capture kernel, bash may not be the

# default shell. Any code added must be POSIX compliant.

. /lib/dracut-lib.sh

. /lib/kdump-logger.sh

. /lib/kdump-lib-initramfs.sh

#initiate the kdump logger

if ! dlog_init; then

	echo "failed to initiate the kdump logger."

	exit 1

fi

KDUMP_PATH="/var/crash"

KDUMP_LOG_FILE="/run/initramfs/kexec-dmesg.log"

CORE_COLLECTOR=""

DEFAULT_CORE_COLLECTOR="makedumpfile -l --message-level 7 -d 31"

DMESG_COLLECTOR="/sbin/vmcore-dmesg"

FAILURE_ACTION="systemctl reboot -f"

DATEDIR=$(date +%Y-%m-%d-%T)

HOST_IP='127.0.0.1'

DUMP_INSTRUCTION=""

SSH_KEY_LOCATION="/root/.ssh/kdump_id_rsa"

DD_BLKSIZE=512

FINAL_ACTION="systemctl reboot -f"

KDUMP_PRE=""

KDUMP_POST=""

NEWROOT="/sysroot"

OPALCORE="/sys/firmware/opal/mpipl/core"

KDUMP_CONF_PARSED="/tmp/kdump.conf.$$"

# POSIX doesn't have pipefail, only apply when using bash

# shellcheck disable=SC3040

[ -n "$BASH" ] && set -o pipefail

DUMP_RETVAL=0

kdump_read_conf > $KDUMP_CONF_PARSED

get_kdump_confs()

{

	while read -r config_opt config_val; do

		# remove inline comments after the end of a directive.

		case "$config_opt" in

		path)

			KDUMP_PATH="$config_val"

			;;

		core_collector)

			[ -n "$config_val" ] && CORE_COLLECTOR="$config_val"

			;;

		sshkey)

			if [ -f "$config_val" ]; then

				SSH_KEY_LOCATION=$config_val

			fi

			;;

		kdump_pre)

			KDUMP_PRE="$config_val"

			;;

		kdump_post)

			KDUMP_POST="$config_val"

			;;

		fence_kdump_args)

			FENCE_KDUMP_ARGS="$config_val"

			;;

		fence_kdump_nodes)

			FENCE_KDUMP_NODES="$config_val"

			;;

		failure_action | default)

			case $config_val in

			shell)

				FAILURE_ACTION="kdump_emergency_shell"

				;;

			reboot)

				FAILURE_ACTION="systemctl reboot -f && exit"

				;;

			halt)

				FAILURE_ACTION="halt && exit"

				;;

			poweroff)

				FAILURE_ACTION="systemctl poweroff -f && exit"

				;;

			dump_to_rootfs)

				FAILURE_ACTION="dump_to_rootfs"

				;;

			esac

			;;

		final_action)

			case $config_val in

			reboot)

				FINAL_ACTION="systemctl reboot -f"

				;;

			halt)

				FINAL_ACTION="halt"

				;;

			poweroff)

				FINAL_ACTION="systemctl poweroff -f"

				;;

			esac

			;;

		esac

	done < "$KDUMP_CONF_PARSED"

	if [ -z "$CORE_COLLECTOR" ]; then

		CORE_COLLECTOR="$DEFAULT_CORE_COLLECTOR"

		if is_ssh_dump_target || is_raw_dump_target; then

			CORE_COLLECTOR="$CORE_COLLECTOR -F"

		fi

	fi

}

# store the kexec kernel log to a file.

save_log()

{

	dmesg -T > $KDUMP_LOG_FILE

	if command -v journalctl > /dev/null; then

		journalctl -ab >> $KDUMP_LOG_FILE

	fi

	chmod 600 $KDUMP_LOG_FILE

}

# $1: dump path, must be a mount point

dump_fs()

{

	ddebug "dump_fs _mp=$1"

	if ! is_mounted "$1"; then

		dinfo "dump path '$1' is not mounted, trying to mount..."

		if ! mount --target "$1"; then

			derror "failed to dump to '$1', it's not a mount point!"

			return 1

		fi

	fi

	# Remove -F in makedumpfile case. We don't want a flat format dump here.

	case $CORE_COLLECTOR in

	*makedumpfile*)

		CORE_COLLECTOR=$(echo "$CORE_COLLECTOR" | sed -e "s/-F//g")

		;;

	esac

	_dump_fs_path=$(echo "$1/$KDUMP_PATH/$HOST_IP-$DATEDIR/" | tr -s /)

	dinfo "saving to $_dump_fs_path"

	# Only remount to read-write mode if the dump target is mounted read-only.

	_dump_mnt_op=$(get_mount_info OPTIONS target "$1" -f)

	case $_dump_mnt_op in

	ro*)

		dinfo "Remounting the dump target in rw mode."

		mount -o remount,rw "$1" || return 1

		;;

	esac

	mkdir -p "$_dump_fs_path" || return 1

	save_vmcore_dmesg_fs ${DMESG_COLLECTOR} "$_dump_fs_path"

	save_opalcore_fs "$_dump_fs_path"

	dinfo "saving vmcore"

	$CORE_COLLECTOR /proc/vmcore "$_dump_fs_path/vmcore-incomplete"

	_dump_exitcode=$?

	if [ $_dump_exitcode -eq 0 ]; then

		mv "$_dump_fs_path/vmcore-incomplete" "$_dump_fs_path/vmcore"

		sync

		dinfo "saving vmcore complete"

	else

		derror "saving vmcore failed, exitcode:$_dump_exitcode"

	fi

	dinfo "saving the $KDUMP_LOG_FILE to $_dump_fs_path/"

	save_log

	mv "$KDUMP_LOG_FILE" "$_dump_fs_path/"

	if [ $_dump_exitcode -ne 0 ]; then

		return 1

	fi

	# improper kernel cmdline can cause the failure of echo, we can ignore this kind of failure

	return 0

}

# $1: dmesg collector

# $2: dump path

save_vmcore_dmesg_fs()

{

	dinfo "saving vmcore-dmesg.txt to $2"

	if $1 /proc/vmcore > "$2/vmcore-dmesg-incomplete.txt"; then

		mv "$2/vmcore-dmesg-incomplete.txt" "$2/vmcore-dmesg.txt"

		chmod 600 "$2/vmcore-dmesg.txt"

		# Make sure file is on disk. There have been instances where later

		# saving vmcore failed and system rebooted without sync and there

		# was no vmcore-dmesg.txt available.

		sync

		dinfo "saving vmcore-dmesg.txt complete"

	else

		if [ -f "$2/vmcore-dmesg-incomplete.txt" ]; then

			chmod 600 "$2/vmcore-dmesg-incomplete.txt"

		fi

		derror "saving vmcore-dmesg.txt failed"

	fi

}

# $1: dump path

save_opalcore_fs()

{

	if [ ! -f $OPALCORE ]; then

		# Check if we are on an old kernel that uses a different path

		if [ -f /sys/firmware/opal/core ]; then

			OPALCORE="/sys/firmware/opal/core"

		else

			return 0

		fi

	fi

	dinfo "saving opalcore:$OPALCORE to $1/opalcore"

	if ! cp $OPALCORE "$1/opalcore"; then

		derror "saving opalcore failed"

		return 1

	fi

	sync

	dinfo "saving opalcore complete"

	return 0

}

dump_to_rootfs()

{

	if [ "$(systemctl status dracut-initqueue | sed -n "s/^\s*Active: \(\S*\)\s.*$/\1/p")" = "inactive" ]; then

		dinfo "Trying to bring up initqueue for rootfs mount"

		systemctl start dracut-initqueue

	fi

	dinfo "Clean up dead systemd services"

	systemctl cancel

	dinfo "Waiting for rootfs mount, will timeout after 90 seconds"

	systemctl start --no-block sysroot.mount

	_loop=0

	while [ $_loop -lt 90 ] && ! is_mounted /sysroot; do

		sleep 1

		_loop=$((_loop + 1))

	done

	if ! is_mounted /sysroot; then

		derror "Failed to mount rootfs"

		return

	fi

	ddebug "NEWROOT=$NEWROOT"

	dump_fs $NEWROOT

}

kdump_emergency_shell()

{

	ddebug "Switching to kdump emergency shell..."

	[ -f /etc/profile ] && . /etc/profile

	export PS1='kdump:${PWD}# '

	. /lib/dracut-lib.sh

	if [ -f /dracut-state.sh ]; then

		. /dracut-state.sh 2> /dev/null

	fi

	source_conf /etc/conf.d

	type plymouth > /dev/null 2>&1 && plymouth quit

	source_hook "emergency"

	while read -r _tty rest; do

		(

			echo

			echo

			echo 'Entering kdump emergency mode.'

			echo 'Type "journalctl" to view system logs.'

			echo 'Type "rdsosreport" to generate a sosreport, you can then'

			echo 'save it elsewhere and attach it to a bug report.'

			echo

			echo

		) > "/dev/$_tty"

	done < /proc/consoles

	sh -i -l

	/bin/rm -f -- /.console_lock

}

do_failure_action()

{

	dinfo "Executing failure action $FAILURE_ACTION"

	eval $FAILURE_ACTION

}

do_final_action()

{

	dinfo "Executing final action $FINAL_ACTION"

	eval $FINAL_ACTION

}

do_dump()

{

	eval $DUMP_INSTRUCTION

	_ret=$?

	if [ $_ret -ne 0 ]; then

		derror "saving vmcore failed"

	fi

	return $_ret

}

do_kdump_pre()

{

	if [ -n "$KDUMP_PRE" ]; then

		"$KDUMP_PRE"

		_ret=$?

		if [ $_ret -ne 0 ]; then

			derror "$KDUMP_PRE exited with $_ret status"

			return $_ret

		fi

	fi

	# if any script fails, it just raises warning and continues

	if [ -d /etc/kdump/pre.d ]; then

		for file in /etc/kdump/pre.d/*; do

			"$file"

			_ret=$?

			if [ $_ret -ne 0 ]; then

				derror "$file exited with $_ret status"

			fi

		done

	fi

	return 0

}

do_kdump_post()

{

	if [ -d /etc/kdump/post.d ]; then

		for file in /etc/kdump/post.d/*; do

			"$file" "$1"

			_ret=$?

			if [ $_ret -ne 0 ]; then

				derror "$file exited with $_ret status"

			fi

		done

	fi

	if [ -n "$KDUMP_POST" ]; then

		"$KDUMP_POST" "$1"

		_ret=$?

		if [ $_ret -ne 0 ]; then

			derror "$KDUMP_POST exited with $_ret status"

		fi

	fi

}

# $1: block target, eg. /dev/sda

dump_raw()

{

	[ -b "$1" ] || return 1

	dinfo "saving to raw disk $1"

	if ! echo "$CORE_COLLECTOR" | grep -q makedumpfile; then

		_src_size=$(stat --format %s /proc/vmcore)

		_src_size_mb=$((_src_size / 1048576))

		/kdumpscripts/monitor_dd_progress $_src_size_mb &

	fi

	dinfo "saving vmcore"

	$CORE_COLLECTOR /proc/vmcore | dd of="$1" bs=$DD_BLKSIZE >> /tmp/dd_progress_file 2>&1 || return 1

	sync

	dinfo "saving vmcore complete"

	return 0

}

# $1: ssh key file

# $2: ssh address in <user>@<host> format

dump_ssh()

{

	_ret=0

	_ssh_opt="-i $1 -o BatchMode=yes -o StrictHostKeyChecking=yes"

	_ssh_dir="$KDUMP_PATH/$HOST_IP-$DATEDIR"

	if is_ipv6_address "$2"; then

		_scp_address=${2%@*}@"[${2#*@}]"

	else

		_scp_address=$2

	fi

	dinfo "saving to $2:$_ssh_dir"

	cat /var/lib/random-seed > /dev/urandom

	ssh -q $_ssh_opt "$2" mkdir -p "$_ssh_dir" || return 1

	save_vmcore_dmesg_ssh "$DMESG_COLLECTOR" "$_ssh_dir" "$_ssh_opt" "$2"

	dinfo "saving vmcore"

	save_opalcore_ssh "$_ssh_dir" "$_ssh_opt" "$2" "$_scp_address"

	if [ "${CORE_COLLECTOR%%[[:blank:]]*}" = "scp" ]; then

		scp -q $_ssh_opt /proc/vmcore "$_scp_address:$_ssh_dir/vmcore-incomplete"

		_ret=$?

		_vmcore="vmcore"

	else

		$CORE_COLLECTOR /proc/vmcore | ssh $_ssh_opt "$2" "umask 0077 && dd bs=512 of='$_ssh_dir/vmcore-incomplete'"

		_ret=$?

		_vmcore="vmcore.flat"

	fi

	if [ $_ret -eq 0 ]; then

		ssh $_ssh_opt "$2" "mv '$_ssh_dir/vmcore-incomplete' '$_ssh_dir/$_vmcore'"

		_ret=$?

		if [ $_ret -ne 0 ]; then

			derror "moving vmcore failed, exitcode:$_ret"

		else

			dinfo "saving vmcore complete"

		fi

	else

		derror "saving vmcore failed, exitcode:$_ret"

	fi

	dinfo "saving the $KDUMP_LOG_FILE to $2:$_ssh_dir/"

	save_log

	if ! scp -q $_ssh_opt $KDUMP_LOG_FILE "$_scp_address:$_ssh_dir/"; then

		derror "saving log file failed, _exitcode:$_ret"

	fi

	return $_ret

}

# $1: dump path

# $2: ssh opts

# $3: ssh address in <user>@<host> format

# $4: scp address, similar with ssh address but IPv6 addresses are quoted

save_opalcore_ssh()

{

	if [ ! -f $OPALCORE ]; then

		# Check if we are on an old kernel that uses a different path

		if [ -f /sys/firmware/opal/core ]; then

			OPALCORE="/sys/firmware/opal/core"

		else

			return 0

		fi

	fi

	dinfo "saving opalcore:$OPALCORE to $3:$1"

	if ! scp $2 $OPALCORE "$4:$1/opalcore-incomplete"; then

		derror "saving opalcore failed"

		return 1

	fi

	ssh $2 "$3" mv "$1/opalcore-incomplete" "$1/opalcore"

	dinfo "saving opalcore complete"

	return 0

}

# $1: dmesg collector

# $2: dump path

# $3: ssh opts

# $4: ssh address in <user>@<host> format

save_vmcore_dmesg_ssh()

{

	dinfo "saving vmcore-dmesg.txt to $4:$2"

	if $1 /proc/vmcore | ssh $3 "$4" "umask 0077 && dd of='$2/vmcore-dmesg-incomplete.txt'"; then

		ssh -q $3 "$4" mv "$2/vmcore-dmesg-incomplete.txt" "$2/vmcore-dmesg.txt"

		dinfo "saving vmcore-dmesg.txt complete"

	else

		derror "saving vmcore-dmesg.txt failed"

	fi

}

get_host_ip()

{

	if is_nfs_dump_target || is_ssh_dump_target; then

		kdumpnic=$(getarg kdumpnic=)

		if [ -z "$kdumpnic" ]; then

			derror "failed to get kdumpnic!"

			return 1

		fi

		if ! kdumphost=$(ip addr show dev "$kdumpnic" | grep '[ ]*inet'); then

			derror "wrong kdumpnic: $kdumpnic"

			return 1

		fi

		kdumphost=$(echo "$kdumphost" | head -n 1 | awk '{print $2}')

		kdumphost="${kdumphost%%/*}"

		if [ -z "$kdumphost" ]; then

			derror "wrong kdumpnic: $kdumpnic"

			return 1

		fi

		HOST_IP=$kdumphost

	fi

	return 0

}

read_kdump_confs()

{

	if [ ! -f "$KDUMP_CONFIG_FILE" ]; then

		derror "$KDUMP_CONFIG_FILE not found"

		return

	fi

	get_kdump_confs

	# rescan for add code for dump target

	while read -r config_opt config_val; do

		# remove inline comments after the end of a directive.

		case "$config_opt" in

		dracut_args)

			config_val=$(get_dracut_args_target "$config_val")

			if [ -n "$config_val" ]; then

				config_val=$(get_mntpoint_from_target "$config_val")

				DUMP_INSTRUCTION="dump_fs $config_val"

			fi

			;;

		ext[234] | xfs | btrfs | minix | nfs)

			config_val=$(get_mntpoint_from_target "$config_val")

			DUMP_INSTRUCTION="dump_fs $config_val"

			;;

		raw)

			DUMP_INSTRUCTION="dump_raw $config_val"

			;;

		ssh)

			DUMP_INSTRUCTION="dump_ssh $SSH_KEY_LOCATION $config_val"

			;;

		esac

	done < "$KDUMP_CONF_PARSED"

}

fence_kdump_notify()

{

	if [ -n "$FENCE_KDUMP_NODES" ]; then

		# shellcheck disable=SC2086

		$FENCE_KDUMP_SEND $FENCE_KDUMP_ARGS $FENCE_KDUMP_NODES &

	fi

}

if [ "$1" = "--error-handler" ]; then

	get_kdump_confs

	do_failure_action

	do_final_action

	exit $?

fi

# continue here only if we have to save dump.

if [ -f /etc/fadump.initramfs ] && [ ! -f /proc/device-tree/rtas/ibm,kernel-dump ] && [ ! -f /proc/device-tree/ibm,opal/dump/mpipl-boot ]; then

	exit 0

fi

read_kdump_confs

fence_kdump_notify

if ! get_host_ip; then

	derror "get_host_ip exited with non-zero status!"

	exit 1

fi

if [ -z "$DUMP_INSTRUCTION" ]; then

	DUMP_INSTRUCTION="dump_fs $NEWROOT"

fi

if ! do_kdump_pre; then

	derror "kdump_pre script exited with non-zero status!"

	do_final_action

	# During systemd service to reboot the machine, stop this shell script running

	exit 1

fi

make_trace_mem "kdump saving vmcore" '1:shortmem' '2+:mem' '3+:slab'

do_dump

DUMP_RETVAL=$?

if ! do_kdump_post $DUMP_RETVAL; then

	derror "kdump_post script exited with non-zero status!"

fi

if [ $DUMP_RETVAL -ne 0 ]; then

	exit 1

fi

do_final_action