Edit File: prune_debug
#!/bin/sh ###################################################################### # Prune undesired systemd.debug entries in kernels that are not # marked for debugging. See Red Hat bugzilla 1285601. ###################################################################### PATH=/usr/bin:/usr/sbin EPOCH_DATE=$(date +"%s") LOG_DIR="/var/log" LOG_FILE="${LOG_DIR}/grubby_prune_debug" display_event() { EVENT_LABEL="$1" EVENT_DATA="$2" JUSTIFIED_LABEL=$(printf "%-12s" "${EVENT_LABEL}") LOG_TIMESTAMP=$(date +"%s") echo "[${LOG_TIMESTAMP}] ${JUSTIFIED_LABEL}: ${EVENT_DATA}" >> "${LOG_FILE}" } exit_event() { display_event "Exit" "Exiting script" exit $1 } find_entry_by_title() { SEARCH_TITLE=$1 display_event "Examine" "Searching for entry title - ${SEARCH_TITLE}" for current_index in $(grubby --info=ALL|grep "^index="| sed 's/^index=//') ; do CURRENT_TITLE=$(grubby --info="${current_index}" 2> /dev/null |grep "^title=" | sed 's/^title=//') # do not do anything if this was empty [ -z "${CURRENT_TITLE}" ] && continue if [ "${CURRENT_TITLE}" = "${SEARCH_TITLE}" ]; then echo "${current_index}" break; fi done } [ -d "${LOG_DIR}" ] || mkdir -p -m 0755 "${LOG_DIR}" display_event "Start" "Begin search for extraneous debug arguments" if [ "$(id -u)" -ne 0 ]; then display_event "Error" "This script may only run as root." exit_event 0 fi ###################################################################### # Back up the grub.cfg for sanity ###################################################################### BOOTLOADER_CFG= BOOTLOADER_CFG_BK= if [ -f "/etc/grub2.cfg" ]; then BOOTLOADER_CFG=$(realpath "/etc/grub2.cfg") BOOTLOADER_CFG_BK="${BOOTLOADER_CFG}.${EPOCH_DATE}.rpmsave" elif [ -f "/etc/grub2-efi.cfg" ]; then BOOTLOADER_CFG=$(realpath "/etc/grub2-efi.cfg") BOOTLOADER_CFG_BK="${BOOTLOADER_CFG}.${EPOCH_DATE}.rpmsave" elif [ -f "/etc/zipl.conf" ]; then BOOTLOADER_CFG=$(realpath "/etc/zipl.conf") BOOTLOADER_CFG_BK="${BOOTLOADER_CFG}.${EPOCH_DATE}.rpmsave" elif [ -f "/etc/yaboot.conf" ]; then BOOTLOADER_CFG=$(realpath "/etc/yaboot.conf") BOOTLOADER_CFG_BK="${BOOTLOADER_CFG}.${EPOCH_DATE}.rpmsave" fi if [ -z "${BOOTLOADER_CFG}" ]; then display_event "Error" "Could not find a bootloader configuration to back up" exit_event 0 fi if [ -f "${BOOTLOADER_CFG}" ]; then if cp -a "${BOOTLOADER_CFG}" "${BOOTLOADER_CFG_BK}" 2> /dev/null; then display_event "Copied" \ "Current configuration backed up to ${BOOTLOADER_CFG_BK}" else display_event "Error" "Could not write ${BOOTLOADER_CFG_BK}" exit_event 0 fi fi ###################################################################### # Figure out what the debugging tag will look like ###################################################################### ARCH=$(uname -m) if [ $ARCH = 's390' -o $ARCH = 's390x' ]; then DEBUGGING_TAG="_with_debugging" else DEBUGGING_TAG=" with debugging" fi ###################################################################### # Remove the systemd.debug kernel arguments from standard non-debug # kernel entries only ###################################################################### display_event "Examine" "Searching for distribution provided debugging entries" for entry_index in $(grubby --info=ALL|grep "^index="| sed 's/^index=//') ; do INDEX_TITLE=$(grubby --info="${entry_index}" 2> /dev/null |grep "^title=" | sed 's/^title=//') # do not do anything if this was empty [ -z "${INDEX_TITLE}" ] && continue if echo "${INDEX_TITLE}" | grep -q "${DEBUGGING_TAG}$"; then display_event "Found" "Found distribution provided debugging entry - ${INDEX_TITLE}" NON_DEBUG_TITLE=$(echo "${INDEX_TITLE}" | sed "s/${DEBUGGING_TAG}$//") NON_DEBUG_INDEX=$(find_entry_by_title "${NON_DEBUG_TITLE}") if [ -n "${NON_DEBUG_INDEX}" ]; then display_event "Found" "Found matching non-debugging entry - ${NON_DEBUG_TITLE}" KERNEL_ARGS=$(grubby --info="${NON_DEBUG_INDEX}" 2> /dev/null |grep "^args=") if echo "${KERNEL_ARGS}" | grep -E -q 'systemd.debug|systemd.log_level=debug|systemd.log_target=kmsg'; then if grubby --update-kernel="${NON_DEBUG_INDEX}" --remove-args="systemd.debug systemd.log_level=debug systemd.log_target=kmsg"; then display_event "Update" "Removed debugging arguments for ${NON_DEBUG_TITLE}" else display_event "Error" "grubby failed to remove debug argument from ${NON_DEBUG_TITLE}" fi else display_event "Skip" "No debugging arguments to remove for ${NON_DEBUG_TITLE}" fi else display_event "Error" "Could not find the matching non-debugging entry - ${NON_DEBUG_TITLE}" fi fi done ###################################################################### # The default entry should not have debugging statements ###################################################################### # source of ALLOW_DEBUGGING_DEFAULT [ -f /etc/sysconfig/kernel ] && . /etc/sysconfig/kernel CURRENT_DEFAULT_INDEX=$(grubby --default-index) CURRENT_TITLE=$(grubby --info="${CURRENT_DEFAULT_INDEX}" 2> /dev/null |grep "^title=" | sed 's/^title=//') if echo "${CURRENT_TITLE}" | grep -q "${DEBUGGING_TAG}$"; then case "${ALLOW_DEBUGGING_DEFAULT}" in [Yy][Ee][Ss]|[Tt][Rr][Uu][Ee]|1) display_event "Examine" "Detected user preference to allow debugging default entries if present" exit_event 0 ;; esac display_event "Examine" "Search for entry without debugging to replace default entry - ${CURRENT_TITLE}" unset NON_DEBUG_INDEX unset NON_DEBUG_TITLE ARCH=$(uname -m) NON_DEBUG_TITLE=$(echo "${CURRENT_TITLE}" | sed "s/${DEBUGGING_TAG}$//") NON_DEBUG_INDEX=$(find_entry_by_title "${NON_DEBUG_TITLE}") if [ -n "${NON_DEBUG_INDEX}" ]; then if grubby --set-default-index="${NON_DEBUG_INDEX}"; then display_event "Update" "Selected ${NON_DEBUG_TITLE} as the new default entry" else display_event "Error" "Could not set ${NON_DEBUG_TITLE} as default" fi else display_event "Error" "Could not find the matching non-debugging entry" fi fi exit_event 0