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-rw-r--r--scrub/e2scrub_all.in185
1 files changed, 185 insertions, 0 deletions
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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 (( $EUID != 0 )); then
+ echo "e2scrub_all must be run as root"
+ exit 1
+fi
+
+periodic_e2scrub=0
+scrub_all=0
+snap_size_mb=256
+reap=0
+conffile="@root_sysconfdir@/e2scrub.conf"
+
+test -f "${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 @E2FSPROGS_VERSION@ (@E2FSPROGS_DATE@)"
+}
+
+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} "@root_sbindir@/e2scrub" ${scrub_args} "${tgt}"
+done
+
+exitcode 0