422 lines
11 KiB
Bash
Executable File
422 lines
11 KiB
Bash
Executable File
#!/bin/sh
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#
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# Function and variables used in initramfs environment, POSIX compatible
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#
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. /lib/kdump-logger.sh
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DEFAULT_PATH="/var/crash/"
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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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KDUMP_SCRIPT_DIR="/kdumpscripts"
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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_CONFIG_FILE="/etc/kdump.conf"
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#initiate the kdump logger
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dlog_init
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if [ $? -ne 0 ]; then
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echo "failed to initiate the kdump logger."
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exit 1
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fi
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# Read kdump config in well formated style
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kdump_read_conf()
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{
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# Following steps are applied in order: strip trailing comment, strip trailing space,
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# strip heading space, match non-empty line, remove duplicated spaces between conf name and value
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[ -f "$KDUMP_CONFIG_FILE" ] && sed -n -e "s/#.*//;s/\s*$//;s/^\s*//;s/\(\S\+\)\s*\(.*\)/\1 \2/p" $KDUMP_CONFIG_FILE
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}
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# Retrieves config value defined in kdump.conf
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# $1: config name, sed regexp compatible
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kdump_get_conf_val() {
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# For lines matching "^\s*$1\s+", remove matched part (config name including space),
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# remove tailing comment, space, then store in hold space. Print out the hold buffer on last line.
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[ -f "$KDUMP_CONFIG_FILE" ] && \
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sed -n -e "/^\s*\($1\)\s\+/{s/^\s*\($1\)\s\+//;s/#.*//;s/\s*$//;h};\${x;p}" $KDUMP_CONFIG_FILE
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}
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is_mounted()
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{
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findmnt -k -n $1 &>/dev/null
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}
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get_mount_info()
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{
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local _info_type=$1 _src_type=$2 _src=$3; shift 3
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local _info=$(findmnt -k -n -r -o $_info_type --$_src_type $_src $@)
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[ -z "$_info" ] && [ -e "/etc/fstab" ] && _info=$(findmnt -s -n -r -o $_info_type --$_src_type $_src $@)
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echo $_info
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}
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is_ipv6_address()
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{
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echo $1 | grep -q ":"
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}
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is_fs_type_nfs()
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{
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[ "$1" = "nfs" ] || [ "$1" = "nfs4" ]
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}
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# If $1 contains dracut_args "--mount", return <filesystem type>
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get_dracut_args_fstype()
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{
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echo $1 | grep "\-\-mount" | sed "s/.*--mount .\(.*\)/\1/" | cut -d' ' -f3
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}
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# If $1 contains dracut_args "--mount", return <device>
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get_dracut_args_target()
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{
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echo $1 | grep "\-\-mount" | sed "s/.*--mount .\(.*\)/\1/" | cut -d' ' -f1
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}
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get_save_path()
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{
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local _save_path=$(kdump_get_conf_val path)
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[ -z "$_save_path" ] && _save_path=$DEFAULT_PATH
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# strip the duplicated "/"
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echo $_save_path | tr -s /
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}
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get_root_fs_device()
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{
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findmnt -k -f -n -o SOURCE /
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}
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# Return the current underlying device of a path, ignore bind mounts
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get_target_from_path()
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{
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local _target
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_target=$(df $1 2>/dev/null | tail -1 | awk '{print $1}')
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[[ "$_target" == "/dev/root" ]] && [[ ! -e /dev/root ]] && _target=$(get_root_fs_device)
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echo $_target
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}
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get_fs_type_from_target()
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{
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get_mount_info FSTYPE source $1 -f
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}
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get_mntpoint_from_target()
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{
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# --source is applied to ensure non-bind mount is returned
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get_mount_info TARGET source $1 -f
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}
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is_ssh_dump_target()
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{
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[[ $(kdump_get_conf_val ssh) == *@* ]]
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}
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is_raw_dump_target()
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{
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[[ $(kdump_get_conf_val raw) ]]
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}
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is_nfs_dump_target()
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{
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if [[ $(kdump_get_conf_val nfs) ]]; then
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return 0;
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fi
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if is_fs_type_nfs $(get_dracut_args_fstype "$(kdump_get_conf_val dracut_args)"); then
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return 0
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fi
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local _save_path=$(get_save_path)
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local _target=$(get_target_from_path $_save_path)
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local _fstype=$(get_fs_type_from_target $_target)
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if is_fs_type_nfs $_fstype; then
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return 0
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fi
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return 1
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}
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is_fs_dump_target()
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{
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[[ $(kdump_get_conf_val "ext[234]\|xfs\|btrfs\|minix") ]]
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}
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get_kdump_confs()
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{
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local config_opt config_val
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while read config_opt config_val;
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do
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# remove inline comments after the end of a directive.
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case "$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_read_conf)"
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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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# dump_fs <mount point>
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dump_fs()
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{
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local _exitcode
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local _mp=$1
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local _op=$(get_mount_info OPTIONS target $_mp -f)
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ddebug "dump_fs _mp=$_mp _opts=$_op"
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if ! is_mounted "$_mp"; then
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dinfo "dump path \"$_mp\" is not mounted, trying to mount..."
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mount --target $_mp
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if [ $? -ne 0 ]; then
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derror "failed to dump to \"$_mp\", 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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[[ $CORE_COLLECTOR = *makedumpfile* ]] && CORE_COLLECTOR=`echo $CORE_COLLECTOR | sed -e "s/-F//g"`
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local _dump_path=$(echo "$_mp/$KDUMP_PATH/$HOST_IP-$DATEDIR/" | tr -s /)
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dinfo "saving to $_dump_path"
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# Only remount to read-write mode if the dump target is mounted read-only.
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if [[ "$_op" = "ro"* ]]; then
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dinfo "Remounting the dump target in rw mode."
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mount -o remount,rw $_mp || return 1
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fi
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mkdir -p $_dump_path || return 1
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save_vmcore_dmesg_fs ${DMESG_COLLECTOR} "$_dump_path"
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save_opalcore_fs "$_dump_path"
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dinfo "saving vmcore"
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$CORE_COLLECTOR /proc/vmcore $_dump_path/vmcore-incomplete
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_exitcode=$?
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if [ $_exitcode -eq 0 ]; then
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mv $_dump_path/vmcore-incomplete $_dump_path/vmcore
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sync
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dinfo "saving vmcore complete"
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else
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derror "saving vmcore failed, _exitcode:$_exitcode"
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fi
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dinfo "saving the $KDUMP_LOG_FILE to $_dump_path/"
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save_log
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mv $KDUMP_LOG_FILE $_dump_path/
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if [ $_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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save_vmcore_dmesg_fs() {
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local _dmesg_collector=$1
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local _path=$2
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dinfo "saving vmcore-dmesg.txt to ${_path}"
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$_dmesg_collector /proc/vmcore > ${_path}/vmcore-dmesg-incomplete.txt
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_exitcode=$?
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if [ $_exitcode -eq 0 ]; then
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mv ${_path}/vmcore-dmesg-incomplete.txt ${_path}/vmcore-dmesg.txt
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chmod 600 ${_path}/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 ${_path}/vmcore-dmesg-incomplete.txt ]; then
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chmod 600 ${_path}/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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save_opalcore_fs() {
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local _path=$1
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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 ${_path}/opalcore"
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cp $OPALCORE ${_path}/opalcore
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if [ $? -ne 0 ]; 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 _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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