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#!/bin/bash # Copyright (C) 2018 Oracle. All Rights Reserved. # # Author: Darrick J. Wong <darrick.wong@oracle.com> # # This program is free software; you can redistribute it and/or # modify it under the terms of the GNU General Public License # as published by the Free Software Foundation; either version 2 # of the License, or (at your option) any later version. # # This program is distributed in the hope that it would be useful, # but WITHOUT ANY WARRANTY; without even the implied warranty of # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the # GNU General Public License for more details. # # You should have received a copy of the GNU General Public License # along with this program; if not, write the Free Software Foundation, # Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA. PATH=/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin if (( $EUID != 0 )); then echo "e2scrub_all must be run as root" exit 1 fi periodic_e2scrub=0 scrub_all=0 snap_size_mb=256 reap=0 conffile="/etc/e2scrub.conf" test -f "${conffile}" && . "${conffile}" scrub_args="" print_help() { echo "Usage: $0 [OPTIONS]" echo " -n: Show what commands e2scrub_all would execute." echo " -r: Remove e2scrub snapshots." echo " -A: Scrub all ext[234] filesystems even if not mounted." echo " -V: Print version information and exit." } print_version() { echo "e2scrub_all 1.45.5 (07-Jan-2020)" } exitcode() { ret="$1" # If we're being run as a service, the return code must fit the LSB # init script action error guidelines, which is to say that we # compress all errors to 1 ("generic or unspecified error", LSB 5.0 # section 22.2) and hope the admin will scan the log for what # actually happened. if [ -n "${SERVICE_MODE}" -a "${ret}" -ne 0 ]; then test "${ret}" -ne 0 && ret=1 fi exit "${ret}" } while getopts "nrAV" opt; do case "${opt}" in "n") DBG="echo Would execute: " ;; "r") scrub_args="${scrub_args} -r"; reap=1;; "A") scrub_all=1;; "V") print_version; exitcode 0;; *) print_help; exitcode 2;; esac done shift "$((OPTIND - 1))" # If we're in service mode and the service is not enabled via config file... if [ -n "${SERVICE_MODE}" -a "${periodic_e2scrub}" -ne 1 ]; then # ...don't start e2scrub processes. if [ "${reap}" -eq 0 ]; then exitcode 0 fi # ...and if we don't see any leftover e2scrub snapshots, don't # run the reaping process either, because lvs can be slow. if ! readlink -q -s -e /dev/mapper/*.e2scrub* > /dev/null; then exitcode 0 fi fi # close file descriptor 3 (from cron) since it causes lvm to kvetch exec 3<&- # If some prerequisite packages are not installed, exit with a code # indicating success to avoid spamming the sysadmin with fail messages # when e2scrub_all is run out of cron or a systemd timer. if ! type mapfile >& /dev/null ; then test -n "${SERVICE_MODE}" && exitcode 0 echo "e2scrub_all: can't find mapfile --- is bash 4.xx installed?" exitcode 1 fi if ! type lsblk >& /dev/null ; then test -n "${SERVICE_MODE}" && exitcode 0 echo "e2scrub_all: can't find lsblk --- is util-linux installed?" exitcode 1 fi if ! type lvcreate >& /dev/null ; then test -n "${SERVICE_MODE}" && exitcode 0 echo "e2scrub_all: can't find lvcreate --- is lvm2 installed?" exitcode 1 fi # Find scrub targets, make sure we only do this once. ls_scan_targets() { local devices=$(lvs -o lv_path --noheadings -S "lv_active=active,lv_role=public,lv_role!=snapshot,vg_free>=${snap_size_mb}") if [ -z "$devices" ]; then return 0; fi lsblk -o NAME,MOUNTPOINT,FSTYPE,TYPE -P -n -p $devices | \ grep FSTYPE=\"ext\[234\]\" | grep TYPE=\"lvm\" | \ while read vars ; do eval "${vars}" if [ "${scrub_all}" -eq 1 ] || [ -n "${MOUNTPOINT}" ]; then echo ${MOUNTPOINT:-${NAME}} fi done } # Find leftover scrub snapshots ls_reap_targets() { lvs -o lv_path -S lv_role=snapshot -S lv_name=~\(e2scrub$\) \ --noheadings | sed -e 's/.e2scrub$//' } # Figure out what we're targeting ls_targets() { if [ "${reap}" -eq 1 ]; then ls_reap_targets else ls_scan_targets fi } # systemd doesn't know to do path escaping on the instance variable we pass # to the e2scrub service, which breaks things if there is a dash in the path # name. Therefore, do the path escaping ourselves if needed. # # systemd path escaping also drops the initial slash so we add that back in so # that log messages from the service units preserve the full path and users can # look up log messages using full paths. However, for "/" the escaping rules # do /not/ drop the initial slash, so we have to special-case that here. escape_path_for_systemd() { local path="$1" if [ "${path}" != "/" ]; then echo "-$(systemd-escape --path "${path}")" else echo "-" fi } # Scrub any mounted fs on lvm by creating a snapshot and fscking that. mapfile -t targets < <(ls_targets) for tgt in "${targets[@]}"; do # If we're not reaping and systemd is present, try invoking the # systemd service. if [ "${reap}" -ne 1 ] && type systemctl > /dev/null 2>&1; then tgt_esc="$(escape_path_for_systemd "${tgt}")" ${DBG} systemctl start "e2scrub@${tgt_esc}" 2> /dev/null res=$? if [ "${res}" -eq 0 ] || [ "${res}" -eq 1 ]; then continue; fi fi # Otherwise use direct invocation ${DBG} "/sbin/e2scrub" ${scrub_args} "${tgt}" done exitcode 0
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