Petr Šabata f5bf49
#!/bin/sh
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#
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# The main kdump routine in capture kernel, bash may not be the
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# default shell. Any code added must be POSIX compliant.
Petr Šabata f5bf49
Petr Šabata f5bf49
. /lib/dracut-lib.sh
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. /lib/kdump-logger.sh
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. /lib/kdump-lib-initramfs.sh
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#initiate the kdump logger
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if ! dlog_init; then
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	echo "failed to initiate the kdump logger."
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	exit 1
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fi
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KDUMP_PATH="/var/crash"
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KDUMP_LOG_FILE="/run/initramfs/kexec-dmesg.log"
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CORE_COLLECTOR=""
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DEFAULT_CORE_COLLECTOR="makedumpfile -l --message-level 7 -d 31"
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DMESG_COLLECTOR="/sbin/vmcore-dmesg"
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FAILURE_ACTION="systemctl reboot -f"
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DATEDIR=$(date +%Y-%m-%d-%T)
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HOST_IP='127.0.0.1'
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DUMP_INSTRUCTION=""
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SSH_KEY_LOCATION="/root/.ssh/kdump_id_rsa"
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DD_BLKSIZE=512
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FINAL_ACTION="systemctl reboot -f"
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KDUMP_PRE=""
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KDUMP_POST=""
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NEWROOT="/sysroot"
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OPALCORE="/sys/firmware/opal/mpipl/core"
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KDUMP_CONF_PARSED="/tmp/kdump.conf.$$"
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# POSIX doesn't have pipefail, only apply when using bash
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# shellcheck disable=SC3040
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[ -n "$BASH" ] && set -o pipefail
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DUMP_RETVAL=0
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kdump_read_conf > $KDUMP_CONF_PARSED
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get_kdump_confs()
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{
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	while read -r config_opt config_val; do
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		# remove inline comments after the end of a directive.
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		case "$config_opt" in
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		path)
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			KDUMP_PATH="$config_val"
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			;;
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		core_collector)
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			[ -n "$config_val" ] && CORE_COLLECTOR="$config_val"
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			;;
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		sshkey)
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			if [ -f "$config_val" ]; then
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				SSH_KEY_LOCATION=$config_val
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			fi
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			;;
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		kdump_pre)
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			KDUMP_PRE="$config_val"
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			;;
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		kdump_post)
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			KDUMP_POST="$config_val"
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			;;
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		fence_kdump_args)
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			FENCE_KDUMP_ARGS="$config_val"
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			;;
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		fence_kdump_nodes)
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			FENCE_KDUMP_NODES="$config_val"
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			;;
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		failure_action | default)
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			case $config_val in
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			shell)
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				FAILURE_ACTION="kdump_emergency_shell"
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				;;
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			reboot)
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				FAILURE_ACTION="systemctl reboot -f && exit"
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				;;
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			halt)
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				FAILURE_ACTION="halt && exit"
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				;;
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			poweroff)
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				FAILURE_ACTION="systemctl poweroff -f && exit"
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				;;
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			dump_to_rootfs)
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				FAILURE_ACTION="dump_to_rootfs"
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				;;
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			esac
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			;;
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		final_action)
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			case $config_val in
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			reboot)
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				FINAL_ACTION="systemctl reboot -f"
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				;;
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			halt)
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				FINAL_ACTION="halt"
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				;;
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			poweroff)
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				FINAL_ACTION="systemctl poweroff -f"
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				;;
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			esac
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			;;
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		esac
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	done < "$KDUMP_CONF_PARSED"
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	if [ -z "$CORE_COLLECTOR" ]; then
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		CORE_COLLECTOR="$DEFAULT_CORE_COLLECTOR"
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		if is_ssh_dump_target || is_raw_dump_target; then
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			CORE_COLLECTOR="$CORE_COLLECTOR -F"
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		fi
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	fi
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}
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# store the kexec kernel log to a file.
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save_log()
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{
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	dmesg -T > $KDUMP_LOG_FILE
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	if command -v journalctl > /dev/null; then
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		journalctl -ab >> $KDUMP_LOG_FILE
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	fi
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	chmod 600 $KDUMP_LOG_FILE
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}
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# $1: dump path, must be a mount point
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dump_fs()
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{
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	ddebug "dump_fs _mp=$1"
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	if ! is_mounted "$1"; then
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		dinfo "dump path '$1' is not mounted, trying to mount..."
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		if ! mount --target "$1"; then
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			derror "failed to dump to '$1', it's not a mount point!"
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			return 1
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		fi
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	fi
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	# Remove -F in makedumpfile case. We don't want a flat format dump here.
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	case $CORE_COLLECTOR in
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	*makedumpfile*)
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		CORE_COLLECTOR=$(echo "$CORE_COLLECTOR" | sed -e "s/-F//g")
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		;;
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	esac
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	_dump_fs_path=$(echo "$1/$KDUMP_PATH/$HOST_IP-$DATEDIR/" | tr -s /)
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	dinfo "saving to $_dump_fs_path"
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	# Only remount to read-write mode if the dump target is mounted read-only.
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	_dump_mnt_op=$(get_mount_info OPTIONS target "$1" -f)
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	case $_dump_mnt_op in
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	ro*)
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		dinfo "Remounting the dump target in rw mode."
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		mount -o remount,rw "$1" || return 1
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		;;
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	esac
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	mkdir -p "$_dump_fs_path" || return 1
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	save_vmcore_dmesg_fs ${DMESG_COLLECTOR} "$_dump_fs_path"
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	save_opalcore_fs "$_dump_fs_path"
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	dinfo "saving vmcore"
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	$CORE_COLLECTOR /proc/vmcore "$_dump_fs_path/vmcore-incomplete"
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	_dump_exitcode=$?
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	if [ $_dump_exitcode -eq 0 ]; then
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		mv "$_dump_fs_path/vmcore-incomplete" "$_dump_fs_path/vmcore"
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		sync
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		dinfo "saving vmcore complete"
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	else
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		derror "saving vmcore failed, exitcode:$_dump_exitcode"
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	fi
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	dinfo "saving the $KDUMP_LOG_FILE to $_dump_fs_path/"
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	save_log
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	mv "$KDUMP_LOG_FILE" "$_dump_fs_path/"
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	if [ $_dump_exitcode -ne 0 ]; then
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		return 1
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	fi
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	# improper kernel cmdline can cause the failure of echo, we can ignore this kind of failure
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	return 0
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}
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# $1: dmesg collector
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# $2: dump path
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save_vmcore_dmesg_fs()
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{
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	dinfo "saving vmcore-dmesg.txt to $2"
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	if $1 /proc/vmcore > "$2/vmcore-dmesg-incomplete.txt"; then
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		mv "$2/vmcore-dmesg-incomplete.txt" "$2/vmcore-dmesg.txt"
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		chmod 600 "$2/vmcore-dmesg.txt"
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		# Make sure file is on disk. There have been instances where later
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		# saving vmcore failed and system rebooted without sync and there
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		# was no vmcore-dmesg.txt available.
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		sync
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		dinfo "saving vmcore-dmesg.txt complete"
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	else
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		if [ -f "$2/vmcore-dmesg-incomplete.txt" ]; then
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			chmod 600 "$2/vmcore-dmesg-incomplete.txt"
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		fi
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		derror "saving vmcore-dmesg.txt failed"
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	fi
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}
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# $1: dump path
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save_opalcore_fs()
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{
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	if [ ! -f $OPALCORE ]; then
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		# Check if we are on an old kernel that uses a different path
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		if [ -f /sys/firmware/opal/core ]; then
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			OPALCORE="/sys/firmware/opal/core"
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		else
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			return 0
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		fi
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	fi
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	dinfo "saving opalcore:$OPALCORE to $1/opalcore"
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	if ! cp $OPALCORE "$1/opalcore"; then
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		derror "saving opalcore failed"
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		return 1
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	fi
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	sync
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	dinfo "saving opalcore complete"
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	return 0
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}
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dump_to_rootfs()
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{
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	if [ "$(systemctl status dracut-initqueue | sed -n "s/^\s*Active: \(\S*\)\s.*$/\1/p")" = "inactive" ]; then
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		dinfo "Trying to bring up initqueue for rootfs mount"
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		systemctl start dracut-initqueue
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	fi
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	dinfo "Clean up dead systemd services"
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	systemctl cancel
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	dinfo "Waiting for rootfs mount, will timeout after 90 seconds"
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	systemctl start --no-block sysroot.mount
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	_loop=0
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	while [ $_loop -lt 90 ] && ! is_mounted /sysroot; do
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		sleep 1
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		_loop=$((_loop + 1))
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	done
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	if ! is_mounted /sysroot; then
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		derror "Failed to mount rootfs"
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		return
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	fi
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	ddebug "NEWROOT=$NEWROOT"
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	dump_fs $NEWROOT
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}
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kdump_emergency_shell()
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{
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	ddebug "Switching to kdump emergency shell..."
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	[ -f /etc/profile ] && . /etc/profile
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	export PS1='kdump:${PWD}# '
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	. /lib/dracut-lib.sh
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	if [ -f /dracut-state.sh ]; then
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		. /dracut-state.sh 2> /dev/null
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	fi
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	source_conf /etc/conf.d
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	type plymouth > /dev/null 2>&1 && plymouth quit
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	source_hook "emergency"
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	while read -r _tty rest; do
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		(
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			echo
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			echo
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			echo 'Entering kdump emergency mode.'
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			echo 'Type "journalctl" to view system logs.'
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			echo 'Type "rdsosreport" to generate a sosreport, you can then'
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			echo 'save it elsewhere and attach it to a bug report.'
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			echo
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			echo
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		) > "/dev/$_tty"
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	done < /proc/consoles
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	sh -i -l
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	/bin/rm -f -- /.console_lock
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}
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do_failure_action()
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{
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	dinfo "Executing failure action $FAILURE_ACTION"
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	eval $FAILURE_ACTION
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}
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do_final_action()
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{
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	dinfo "Executing final action $FINAL_ACTION"
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	eval $FINAL_ACTION
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}
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Petr Šabata f5bf49
do_dump()
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{
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	eval $DUMP_INSTRUCTION
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	_ret=$?
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	if [ $_ret -ne 0 ]; then
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		derror "saving vmcore failed"
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	fi
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	return $_ret
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}
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do_kdump_pre()
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{
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	if [ -n "$KDUMP_PRE" ]; then
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		"$KDUMP_PRE"
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		_ret=$?
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		if [ $_ret -ne 0 ]; then
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			derror "$KDUMP_PRE exited with $_ret status"
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			return $_ret
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		fi
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	fi
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	# if any script fails, it just raises warning and continues
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	if [ -d /etc/kdump/pre.d ]; then
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		for file in /etc/kdump/pre.d/*; do
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			"$file"
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			_ret=$?
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			if [ $_ret -ne 0 ]; then
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				derror "$file exited with $_ret status"
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			fi
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		done
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	fi
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	return 0
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}
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Petr Šabata f5bf49
do_kdump_post()
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{
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	if [ -d /etc/kdump/post.d ]; then
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		for file in /etc/kdump/post.d/*; do
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			"$file" "$1"
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			_ret=$?
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			if [ $_ret -ne 0 ]; then
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				derror "$file exited with $_ret status"
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			fi
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		done
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	fi
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	if [ -n "$KDUMP_POST" ]; then
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		"$KDUMP_POST" "$1"
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		_ret=$?
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		if [ $_ret -ne 0 ]; then
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			derror "$KDUMP_POST exited with $_ret status"
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		fi
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	fi
Petr Šabata f5bf49
}
Petr Šabata f5bf49
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# $1: block target, eg. /dev/sda
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dump_raw()
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{
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	[ -b "$1" ] || return 1
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	dinfo "saving to raw disk $1"
Petr Šabata f5bf49
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	if ! echo "$CORE_COLLECTOR" | grep -q makedumpfile; then
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		_src_size=$(stat --format %s /proc/vmcore)
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		_src_size_mb=$((_src_size / 1048576))
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		/kdumpscripts/monitor_dd_progress $_src_size_mb &
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	fi
Petr Šabata f5bf49
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	dinfo "saving vmcore"
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	$CORE_COLLECTOR /proc/vmcore | dd of="$1" bs=$DD_BLKSIZE >> /tmp/dd_progress_file 2>&1 || return 1
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	sync
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	dinfo "saving vmcore complete"
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	return 0
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}
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# $1: ssh key file
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# $2: ssh address in <user>@<host> format
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dump_ssh()
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{
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	_ret=0
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	_ssh_opt="-i $1 -o BatchMode=yes -o StrictHostKeyChecking=yes"
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	_ssh_dir="$KDUMP_PATH/$HOST_IP-$DATEDIR"
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	if is_ipv6_address "$2"; then
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		_scp_address=${2%@*}@"[${2#*@}]"
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	else
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		_scp_address=$2
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	fi
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	dinfo "saving to $2:$_ssh_dir"
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	cat /var/lib/random-seed > /dev/urandom
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	ssh -q $_ssh_opt "$2" mkdir -p "$_ssh_dir" || return 1
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	save_vmcore_dmesg_ssh "$DMESG_COLLECTOR" "$_ssh_dir" "$_ssh_opt" "$2"
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	dinfo "saving vmcore"
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	save_opalcore_ssh "$_ssh_dir" "$_ssh_opt" "$2" "$_scp_address"
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	if [ "${CORE_COLLECTOR%%[[:blank:]]*}" = "scp" ]; then
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		scp -q $_ssh_opt /proc/vmcore "$_scp_address:$_ssh_dir/vmcore-incomplete"
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		_ret=$?
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		_vmcore="vmcore"
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	else
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		$CORE_COLLECTOR /proc/vmcore | ssh $_ssh_opt "$2" "umask 0077 && dd bs=512 of='$_ssh_dir/vmcore-incomplete'"
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		_ret=$?
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		_vmcore="vmcore.flat"
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	fi
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	if [ $_ret -eq 0 ]; then
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		ssh $_ssh_opt "$2" "mv '$_ssh_dir/vmcore-incomplete' '$_ssh_dir/$_vmcore'"
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		_ret=$?
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		if [ $_ret -ne 0 ]; then
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			derror "moving vmcore failed, exitcode:$_ret"
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		else
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			dinfo "saving vmcore complete"
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		fi
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	else
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		derror "saving vmcore failed, exitcode:$_ret"
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	fi
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	dinfo "saving the $KDUMP_LOG_FILE to $2:$_ssh_dir/"
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	save_log
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	if ! scp -q $_ssh_opt $KDUMP_LOG_FILE "$_scp_address:$_ssh_dir/"; then
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		derror "saving log file failed, _exitcode:$_ret"
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	fi
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	return $_ret
Petr Šabata f5bf49
}
Petr Šabata f5bf49
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# $1: dump path
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# $2: ssh opts
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# $3: ssh address in <user>@<host> format
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# $4: scp address, similar with ssh address but IPv6 addresses are quoted
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save_opalcore_ssh()
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{
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	if [ ! -f $OPALCORE ]; then
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		# Check if we are on an old kernel that uses a different path
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		if [ -f /sys/firmware/opal/core ]; then
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			OPALCORE="/sys/firmware/opal/core"
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		else
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			return 0
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		fi
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	fi
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	dinfo "saving opalcore:$OPALCORE to $3:$1"
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	if ! scp $2 $OPALCORE "$4:$1/opalcore-incomplete"; then
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		derror "saving opalcore failed"
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		return 1
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	fi
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	ssh $2 "$3" mv "$1/opalcore-incomplete" "$1/opalcore"
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	dinfo "saving opalcore complete"
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	return 0
Petr Šabata f5bf49
}
Petr Šabata f5bf49
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# $1: dmesg collector
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# $2: dump path
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# $3: ssh opts
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# $4: ssh address in <user>@<host> format
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save_vmcore_dmesg_ssh()
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{
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	dinfo "saving vmcore-dmesg.txt to $4:$2"
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	if $1 /proc/vmcore | ssh $3 "$4" "umask 0077 && dd of='$2/vmcore-dmesg-incomplete.txt'"; then
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		ssh -q $3 "$4" mv "$2/vmcore-dmesg-incomplete.txt" "$2/vmcore-dmesg.txt"
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		dinfo "saving vmcore-dmesg.txt complete"
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	else
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		derror "saving vmcore-dmesg.txt failed"
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	fi
Petr Šabata f5bf49
}
Petr Šabata f5bf49
Petr Šabata f5bf49
get_host_ip()
Petr Šabata f5bf49
{
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	if is_nfs_dump_target || is_ssh_dump_target; then
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		kdumpnic=$(getarg kdumpnic=)
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		if [ -z "$kdumpnic" ]; then
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			derror "failed to get kdumpnic!"
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			return 1
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		fi
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		if ! kdumphost=$(ip addr show dev "$kdumpnic" | grep '[ ]*inet'); then
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			derror "wrong kdumpnic: $kdumpnic"
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			return 1
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		fi
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		kdumphost=$(echo "$kdumphost" | head -n 1 | awk '{print $2}')
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		kdumphost="${kdumphost%%/*}"
5e60aa
		if [ -z "$kdumphost" ]; then
5e60aa
			derror "wrong kdumpnic: $kdumpnic"
5e60aa
			return 1
5e60aa
		fi
5e60aa
		HOST_IP=$kdumphost
5e60aa
	fi
5e60aa
	return 0
Petr Šabata f5bf49
}
Petr Šabata f5bf49
67b8dd
read_kdump_confs()
Petr Šabata f5bf49
{
5e60aa
	if [ ! -f "$KDUMP_CONFIG_FILE" ]; then
5e60aa
		derror "$KDUMP_CONFIG_FILE not found"
5e60aa
		return
5e60aa
	fi
5e60aa
5e60aa
	get_kdump_confs
5e60aa
5e60aa
	# rescan for add code for dump target
5e60aa
	while read -r config_opt config_val; do
5e60aa
		# remove inline comments after the end of a directive.
5e60aa
		case "$config_opt" in
5e60aa
		dracut_args)
5e60aa
			config_val=$(get_dracut_args_target "$config_val")
5e60aa
			if [ -n "$config_val" ]; then
5e60aa
				config_val=$(get_mntpoint_from_target "$config_val")
5e60aa
				DUMP_INSTRUCTION="dump_fs $config_val"
5e60aa
			fi
5e60aa
			;;
dcaec9
		ext[234] | xfs | btrfs | minix | nfs | virtiofs)
5e60aa
			config_val=$(get_mntpoint_from_target "$config_val")
5e60aa
			DUMP_INSTRUCTION="dump_fs $config_val"
5e60aa
			;;
5e60aa
		raw)
5e60aa
			DUMP_INSTRUCTION="dump_raw $config_val"
5e60aa
			;;
5e60aa
		ssh)
5e60aa
			DUMP_INSTRUCTION="dump_ssh $SSH_KEY_LOCATION $config_val"
5e60aa
			;;
5e60aa
		esac
5e60aa
	done < "$KDUMP_CONF_PARSED"
Petr Šabata f5bf49
}
Petr Šabata f5bf49
Petr Šabata f5bf49
fence_kdump_notify()
Petr Šabata f5bf49
{
5e60aa
	if [ -n "$FENCE_KDUMP_NODES" ]; then
5e60aa
		# shellcheck disable=SC2086
5e60aa
		$FENCE_KDUMP_SEND $FENCE_KDUMP_ARGS $FENCE_KDUMP_NODES &
5e60aa
	fi
Petr Šabata f5bf49
}
Petr Šabata f5bf49
13a24c
if [ "$1" = "--error-handler" ]; then
5e60aa
	get_kdump_confs
5e60aa
	do_failure_action
5e60aa
	do_final_action
13a24c
5e60aa
	exit $?
13a24c
fi
13a24c
13a24c
# continue here only if we have to save dump.
13a24c
if [ -f /etc/fadump.initramfs ] && [ ! -f /proc/device-tree/rtas/ibm,kernel-dump ] && [ ! -f /proc/device-tree/ibm,opal/dump/mpipl-boot ]; then
5e60aa
	exit 0
13a24c
fi
13a24c
67b8dd
read_kdump_confs
Petr Šabata f5bf49
fence_kdump_notify
Petr Šabata f5bf49
eb6eaf
if ! get_host_ip; then
5e60aa
	derror "get_host_ip exited with non-zero status!"
5e60aa
	exit 1
Petr Šabata f5bf49
fi
Petr Šabata f5bf49
Petr Šabata f5bf49
if [ -z "$DUMP_INSTRUCTION" ]; then
5e60aa
	DUMP_INSTRUCTION="dump_fs $NEWROOT"
Petr Šabata f5bf49
fi
Petr Šabata f5bf49
eb6eaf
if ! do_kdump_pre; then
5e60aa
	derror "kdump_pre script exited with non-zero status!"
5e60aa
	do_final_action
5e60aa
	# During systemd service to reboot the machine, stop this shell script running
5e60aa
	exit 1
Petr Šabata f5bf49
fi
Petr Šabata f5bf49
make_trace_mem "kdump saving vmcore" '1:shortmem' '2+:mem' '3+:slab'
Petr Šabata f5bf49
do_dump
Petr Šabata f5bf49
DUMP_RETVAL=$?
Petr Šabata f5bf49
eb6eaf
if ! do_kdump_post $DUMP_RETVAL; then
5e60aa
	derror "kdump_post script exited with non-zero status!"
Petr Šabata f5bf49
fi
Petr Šabata f5bf49
Petr Šabata f5bf49
if [ $DUMP_RETVAL -ne 0 ]; then
5e60aa
	exit 1
Petr Šabata f5bf49
fi
Petr Šabata f5bf49
Petr Šabata f5bf49
do_final_action