41980f30d9
Use a modified and minimized version of emergency shell.
The differences of this kdump shell and dracut emergency shell are:
- Kdump shell won't generate a rdsosreport automatically
- Customized prompts
- Never ask root password
- Won't tangle with dracut's emergency_action. If emergency_action is
set, dracut emergency shell will perform dracut's emergency_action
instead of kdump final_action on exit.
- If rd.shell=no is set, kdump shell will still work, dracut emergency
shell won't, even if kdump failure_action is set to shell.
Signed-off-by: Kairui Song <kasong@redhat.com>
Acked-by: Coiby Xu <coxu@redhat.com>
282 lines
7.5 KiB
Bash
Executable File
282 lines
7.5 KiB
Bash
Executable File
# These variables and functions are useful in 2nd kernel
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. /lib/kdump-lib.sh
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. /lib/kdump-logger.sh
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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_CONF="/etc/kdump.conf"
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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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#initiate the kdump logger
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dlog_init
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if [ $? -ne 0 ]; then
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echo "failed to initiate the kdump logger."
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exit 1
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fi
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get_kdump_confs()
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{
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local config_opt config_val
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while read config_opt config_val;
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do
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# remove inline comments after the end of a directive.
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case "$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 $config_val in
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reboot)
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FINAL_ACTION="systemctl reboot -f"
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;;
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halt)
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FINAL_ACTION="halt"
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;;
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poweroff)
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FINAL_ACTION="systemctl poweroff -f"
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;;
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esac
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;;
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esac
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done <<< "$(read_strip_comments $KDUMP_CONF)"
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if [ -z "$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.*$/\1/p") == "inactive" ]]; then
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dinfo "Trying to bring up initqueue for rootfs mount"
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systemctl start dracut-initqueue
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fi
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dinfo "Waiting for rootfs mount, will timeout after 90 seconds"
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systemctl start sysroot.mount
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ddebug "NEWROOT=$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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