scrub/e2scrub_all.in

   1 #!/bin/bash
   2
   3 #  Copyright (C) 2018 Oracle.  All Rights Reserved.
   4 #
   5 #  Author: Darrick J. Wong <darrick.wong@oracle.com>
   6 #
   7 #  This program is free software; you can redistribute it and/or
   8 #  modify it under the terms of the GNU General Public License
   9 #  as published by the Free Software Foundation; either version 2
  10 #  of the License, or (at your option) any later version.
  11 #
  12 #  This program is distributed in the hope that it would be useful,
  13 #  but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 #  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 #  GNU General Public License for more details.
  16 #
  17 #  You should have received a copy of the GNU General Public License
  18 #  along with this program; if not, write the Free Software Foundation,
  19 #  Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301, USA.
  20
  21 PATH=/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin
  22
  23 if (( $EUID != 0 )); then
  24     echo "e2scrub_all must be run as root"
  25     exit 1
  26 fi
  27
  28 scrub_all=0
  29 snap_size_mb=256
  30 reap=0
  31 conffile="@root_sysconfdir@/e2scrub.conf"
  32
  33 test -f "${conffile}" && . "${conffile}"
  34
  35 scrub_args=""
  36
  37 print_help() {
  38         echo "Usage: $0 [OPTIONS]"
  39         echo " -n: Show what commands e2scrub_all would execute."
  40         echo " -r: Remove e2scrub snapshots."
  41         echo " -A: Scrub all ext[234] filesystems even if not mounted."
  42         echo " -V: Print version information and exit."
  43 }
  44
  45 print_version() {
  46         echo "e2scrub_all @E2FSPROGS_VERSION@ (@E2FSPROGS_DATE@)"
  47 }
  48
  49 exitcode() {
  50         ret="$1"
  51
  52         # If we're being run as a service, the return code must fit the LSB
  53         # init script action error guidelines, which is to say that we
  54         # compress all errors to 1 ("generic or unspecified error", LSB 5.0
  55         # section 22.2) and hope the admin will scan the log for what
  56         # actually happened.
  57
  58         # We have to sleep 2 seconds here because journald uses the pid to
  59         # connect our log messages to the systemd service.  This is critical
  60         # for capturing all the log messages if the scrub fails, because the
  61         # fail service uses the service name to gather log messages for the
  62         # error report.
  63         if [ -n "${SERVICE_MODE}" ]; then
  64                 test "${ret}" -ne 0 && ret=1
  65                 sleep 2
  66         fi
  67
  68         exit "${ret}"
  69 }
  70
  71 while getopts "nrAV" opt; do
  72         case "${opt}" in
  73         "n") DBG="echo Would execute: " ;;
  74         "r") scrub_args="${scrub_args} -r"; reap=1;;
  75         "A") scrub_all=1;;
  76         "V") print_version; exitcode 0;;
  77         *) print_help; exitcode 2;;
  78         esac
  79 done
  80 shift "$((OPTIND - 1))"
  81
  82 # If some prerequisite packages are not installed, exit with a code
  83 # indicating success to avoid spamming the sysadmin with fail messages
  84 # when e2scrub_all is run out of cron or a systemd timer.
  85
  86 if ! type lsblk >& /dev/null ; then
  87     test -n "${SERVICE_MODE}" && exitcode 0
  88     echo "e2scrub_all: can't find lsblk --- is util-linux installed?"
  89     exitcode 1
  90 fi
  91
  92 if ! type lvcreate >& /dev/null ; then
  93     test -n "${SERVICE_MODE}" && exitcode 0
  94     echo "e2scrub_all: can't find lvcreate --- is lvm2 installed?"
  95     exitcode 1
  96 fi
  97
  98 # Find scrub targets, make sure we only do this once.
  99 ls_scan_targets() {
 100     local devices=$(lvs -o lv_path --noheadings -S "lv_active=active,lv_role=public,lv_role!=snapshot,vg_free>${snap_size_mb}")
 101
 102     if [ -z "$devices" ]; then
 103         return 0;
 104     fi
 105     lsblk -o NAME,MOUNTPOINT,FSTYPE,TYPE -P -n -p $devices | \
 106         grep FSTYPE=\"ext\[234\]\" | grep TYPE=\"lvm\" | \
 107         while read vars ; do
 108                 eval "${vars}"
 109
 110                 if [ "${scrub_all}" -eq 1 ] || [ -n "${MOUNTPOINT}" ]; then
 111                     echo ${MOUNTPOINT:-${NAME}}
 112                 fi
 113         done
 114 }
 115
 116 # Find leftover scrub snapshots
 117 ls_reap_targets() {
 118         lvs -o lv_path -S lv_role=snapshot -S lv_name=~\(e2scrub$\) --noheadings
 119 }
 120
 121 # Figure out what we're targeting
 122 ls_targets() {
 123         if [ "${reap}" -eq 1 ]; then
 124                 ls_reap_targets
 125         else
 126                 ls_scan_targets
 127         fi
 128 }
 129
 130 # systemd doesn't know to do path escaping on the instance variable we pass
 131 # to the e2scrub service, which breaks things if there is a dash in the path
 132 # name.  Therefore, do the path escaping ourselves if needed.
 133 #
 134 # systemd path escaping also drops the initial slash so we add that back in so
 135 # that log messages from the service units preserve the full path and users can
 136 # look up log messages using full paths.  However, for "/" the escaping rules
 137 # do /not/ drop the initial slash, so we have to special-case that here.
 138 escape_path_for_systemd() {
 139         local path="$1"
 140
 141         if [ "${path}" != "/" ]; then
 142                 echo "-$(systemd-escape --path "${path}")"
 143         else
 144                 echo "-"
 145         fi
 146 }
 147
 148 # Scrub any mounted fs on lvm by creating a snapshot and fscking that.
 149 stdin="$(realpath /dev/stdin)"
 150 ls_targets | while read tgt; do
 151         # If we're not reaping and systemd is present, try invoking the
 152         # systemd service.
 153         if [ "${reap}" -ne 1 ] && type systemctl > /dev/null 2>&1; then
 154                 tgt_esc="$(escape_path_for_systemd "${tgt}")"
 155                 ${DBG} systemctl start "e2scrub@${tgt_esc}" 2> /dev/null < "${stdin}"
 156                 res=$?
 157                 if [ "${res}" -eq 0 ] || [ "${res}" -eq 1 ]; then
 158                         continue;
 159                 fi
 160         fi
 161
 162         # Otherwise use direct invocation
 163         ${DBG} "@root_sbindir@/e2scrub" ${scrub_args} "${tgt}" < "${stdin}"
 164 done
 165
 166 exitcode 0