#!/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 1.46.5 (30-Dec-2021)"
}
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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