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lvm2/scripts/vgimportclone.sh
Petr Rockai 05bf4b8cc3 vgimportclone: override global_filter in lvm.conf 
The global filter in system's lvm.conf may conflict with the custom filter we
set up in vgimportclone (they can easily fail to intersect). Since we explicitly
avoid talking to lvmetad in vgimportclone, it is safe and reasonable to do so.
2013-06-02 00:47:17 +02:00

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#!/bin/bash
# Copyright (C) 2009 Chris Procter All rights reserved.
# Copyright (C) 2009 Red Hat, Inc. All rights reserved.
#
# This file is part of LVM2.
#
# This copyrighted material is made available to anyone wishing to use,
# modify, copy, or redistribute it subject to the terms and conditions
# of the GNU General Public License v.2.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software Foundation,
# Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
#
# vgimportclone: This script is used to rename the VG and change the associated
# VG and PV UUIDs (primary application being HW snapshot restore)
# following external commands are used throughout the script
# echo and test are internal in bash at least
RM=rm
BASENAME=basename
MKTEMP=mktemp
AWK=awk
CUT=cut
TR=tr
READLINK=readlink
GREP=grep
GETOPT=getopt
# user may override lvm location by setting LVM_BINARY
LVM="${LVM_BINARY:-lvm}"
die() {
code=$1; shift
echo "Fatal: $@" 1>&2
exit $code
}
"$LVM" version >& /dev/null || die 2 "Could not run lvm binary '$LVM'"
function getvgname {
### get a unique vg name
### $1 = list of exists VGs
### $2 = the name we want
VGLIST=$1
VG=$2
NEWVG=$3
BNAME="${NEWVG:-${VG}}"
NAME="${BNAME}"
I=0
while [[ "${VGLIST}" =~ "${NAME}" ]]
do
I=$(($I+1))
NAME="${BNAME}$I"
done
echo "${NAME}"
}
function checkvalue {
### check return value and error if non zero
if [ $1 -ne 0 ]
then
die $1 "$2, error: $1"
fi
}
function usage {
### display usage message
echo "Usage: ${SCRIPTNAME} [options] PhysicalVolume [PhysicalVolume...]"
echo " -n|--basevgname - Base name for the new volume group(s)"
echo " -i|--import - Import any exported volume groups found"
echo " -t|--test - Run in test mode"
echo " --quiet - Suppress output"
echo " -v|--verbose - Set verbose level"
echo " -d|--debug - Set debug level"
echo " --version - Display version information"
echo " -h|--help - Display this help message"
echo ""
exit 1
}
function cleanup {
#set to use old lvm.conf
LVM_SYSTEM_DIR=${ORIG_LVM_SYS_DIR}
if [ $KEEP_TMP_LVM_SYSTEM_DIR -eq 1 ]; then
echo "${SCRIPTNAME}: LVM_SYSTEM_DIR (${TMP_LVM_SYSTEM_DIR}) must be cleaned up manually."
else
"$RM" -rf -- "${TMP_LVM_SYSTEM_DIR}"
fi
}
SCRIPTNAME=`"$BASENAME" $0`
if [ "$UID" != "0" -a "$EUID" != "0" ]
then
die 3 "${SCRIPTNAME} must be run as root."
fi
LVM_OPTS=""
TEST_OPT=""
DISKS=""
# for compatibility: using mktemp -t rather than --tmpdir
TMP_LVM_SYSTEM_DIR=`"$MKTEMP" -d -t snap.XXXXXXXX`
KEEP_TMP_LVM_SYSTEM_DIR=0
CHANGES_MADE=0
IMPORT=0
DEBUG=""
VERBOSE=""
VERBOSE_COUNT=0
DEVNO=0
if [ -n "${LVM_SYSTEM_DIR}" ]; then
export ORIG_LVM_SYS_DIR="${LVM_SYSTEM_DIR}"
fi
trap cleanup 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18
#####################################################################
### Get and check arguments
#####################################################################
OPTIONS=`"$GETOPT" -o n:dhitv \
-l basevgname:,debug,help,import,quiet,test,verbose,version \
-n "${SCRIPTNAME}" -- "$@"`
[ $? -ne 0 ] && usage
eval set -- "$OPTIONS"
while true
do
case $1 in
-n|--basevgname)
NEWVG="$2"; shift; shift
;;
-i|--import)
IMPORT=1; shift
;;
-t|--test)
TEST_OPT="-t"
shift
;;
--quiet)
LVM_OPTS="--quiet ${LVM_OPTS}"
shift
;;
-v|--verbose)
let VERBOSE_COUNT=VERBOSE_COUNT+1
if [ -z "$VERBOSE" ]
then
VERBOSE="-v"
else
VERBOSE="${VERBOSE}v"
fi
shift
;;
-d|--debug)
if [ -z "$DEBUG" ]
then
DEBUG="-d"
set -x
else
DEBUG="${DEBUG}d"
fi
shift
;;
--version)
"$LVM" version
shift
exit 0
;;
-h|--help)
usage; shift
;;
--)
shift; break
;;
*)
usage
;;
esac
done
# turn on DEBUG (special case associated with -v use)
if [ -z "$DEBUG" -a $VERBOSE_COUNT -gt 3 ]; then
DEBUG="-d"
set -x
fi
# setup LVM_OPTS
if [ -n "${DEBUG}" -o -n "${VERBOSE}" ]
then
LVM_OPTS="${LVM_OPTS} ${DEBUG} ${VERBOSE}"
fi
# process remaining arguments (which should be disks)
for ARG
do
if [ -b "$ARG" ]
then
PVS_OUT=`"${LVM}" pvs ${LVM_OPTS} --noheadings -o vg_name "$ARG" 2>/dev/null`
checkvalue $? "$ARG is not a PV."
PV_VGNAME=$(echo $PVS_OUT | $GREP -v '[[:space:]]+$')
[ -z "$PV_VGNAME" ] && die 3 "$ARG is not in a VG."
ln -s "$ARG" ${TMP_LVM_SYSTEM_DIR}/vgimport${DEVNO}
DISKS="${DISKS} ${TMP_LVM_SYSTEM_DIR}/vgimport${DEVNO}"
DEVNO=$((${DEVNO}+1))
else
die 3 "$ARG is not a block device."
fi
done
### check we have suitable values for important variables
if [ -z "${DISKS}" ]
then
usage
fi
#####################################################################
### Get the existing state so we can use it later
#####################################################################
OLDVGS=`"${LVM}" vgs ${LVM_OPTS} -o name --noheadings 2>/dev/null`
checkvalue $? "Current VG names could not be collected without errors"
#####################################################################
### Prepare the temporary lvm environment
#####################################################################
for BLOCK in ${DISKS}
do
FILTER="\"a|^${BLOCK}$|\", ${FILTER}"
done
export FILTER="filter=[ ${FILTER} \"r|.*|\" ]"
LVMCONF=${TMP_LVM_SYSTEM_DIR}/lvm.conf
# FIXME convert to cmdline override
"$LVM" dumpconfig ${LVM_OPTS} | \
"$AWK" -v DEV=${TMP_LVM_SYSTEM_DIR} -v CACHE=${TMP_LVM_SYSTEM_DIR}/.cache \
-v CACHE_DIR=${TMP_LVM_SYSTEM_DIR}/cache \
'/^[ \t]*filter[ \t]*=/{print ENVIRON["FILTER"];next} \
/^[ \t]*scan[ \t]*=/{print "scan = [ \"" DEV "\" ]";next} \
/^[ \t]*cache[ \t]*=/{print "cache = \"" CACHE "\"";next} \
/^[ \t]*use_lvmetad[ \t]*=/{print "use_lvmetad = 0";next} \
/^[ \t]*global_filter[ \t]*=/{print "global_filter = [ \"a|.*|\" ]";next} \
/^[ \t]*cache_dir[ \t]*=/{print "cache_dir = \"" CACHE_DIR "\"";next} \
{print $0}' > ${LVMCONF}
checkvalue $? "Failed to generate ${LVMCONF}"
# Only keep TMP_LVM_SYSTEM_DIR if it contains something worth keeping
[ -n "${DEBUG}" ] && KEEP_TMP_LVM_SYSTEM_DIR=1
# verify the config contains the filter, scan and cache_dir (or cache) config keywords
"$GREP" -q '^[[:space:]]*filter[[:space:]]*=' ${LVMCONF} || \
die 5 "Temporary lvm.conf must contain 'filter' config."
"$GREP" -q '^[[:space:]]*scan[[:space:]]*=' ${LVMCONF} || \
die 6 "Temporary lvm.conf must contain 'scan' config."
# check for either 'cache' or 'cache_dir' config values
"$GREP" -q '[[:space:]]*cache[[:space:]]*=' ${LVMCONF}
CACHE_RET=$?
"$GREP" -q '^[[:space:]]*cache_dir' ${LVMCONF}
CACHE_DIR_RET=$?
[ $CACHE_RET -eq 0 -o $CACHE_DIR_RET -eq 0 ] || \
die 7 "Temporary lvm.conf must contain 'cache' or 'cache_dir' config."
### set to use new lvm.conf
export LVM_SYSTEM_DIR=${TMP_LVM_SYSTEM_DIR}
#####################################################################
### Rename the VG(s) and change the VG and PV UUIDs.
#####################################################################
PVINFO=`"${LVM}" pvs ${LVM_OPTS} -o pv_name,vg_name,vg_attr --noheadings --separator : 2>/dev/null`
checkvalue $? "PV info could not be collected without errors"
# output VG info so each line looks like: name:exported?:disk1,disk2,...
VGINFO=`echo "${PVINFO}" | \
"$AWK" -F : '{{sub(/^[ \t]*/,"")} \
{sub(/unknown device/,"unknown_device")} \
{vg[$2]=$1","vg[$2]} if($3 ~ /^..x/){x[$2]="x"}} \
END{for(k in vg){printf("%s:%s:%s\n", k, x[k], vg[k])}}'`
checkvalue $? "PV info could not be parsed without errors"
for VG in ${VGINFO}
do
VGNAME=`echo "${VG}" | "$CUT" -d: -f1`
EXPORTED=`echo "${VG}" | "$CUT" -d: -f2`
PVLIST=`echo "${VG}" | "$CUT" -d: -f3- | "$TR" , ' '`
if [ -z "${VGNAME}" ]
then
FOLLOWLIST=""
for DEV in $PVLIST; do
FOLLOW=`"$READLINK" $DEV`
FOLLOWLIST="$FOLLOW $FOLLOWLIST"
done
die 8 "Specified PV(s) ($FOLLOWLIST) don't belong to a VG."
fi
if [ -n "${EXPORTED}" ]
then
if [ ${IMPORT} -eq 1 ]
then
"$LVM" vgimport ${LVM_OPTS} ${TEST_OPT} "${VGNAME}"
checkvalue $? "Volume Group ${VGNAME} could not be imported"
else
echo "Volume Group ${VGNAME} exported, skipping."
continue
fi
fi
### change the pv uuids
if [[ "${PVLIST}" =~ "unknown" ]]
then
echo "Volume Group ${VGNAME} has unknown PV(s), skipping."
echo "- Were all associated PV(s) supplied as arguments?"
continue
fi
for BLOCKDEV in ${PVLIST}
do
"$LVM" pvchange ${LVM_OPTS} ${TEST_OPT} --uuid ${BLOCKDEV} --config 'global{activation=0}'
checkvalue $? "Unable to change PV uuid for ${BLOCKDEV}"
done
NEWVGNAME=`getvgname "${OLDVGS}" "${VGNAME}" "${NEWVG}"`
"$LVM" vgchange ${LVM_OPTS} ${TEST_OPT} --uuid "${VGNAME}" --config 'global{activation=0}'
checkvalue $? "Unable to change VG uuid for ${VGNAME}"
## if the name isn't going to get changed dont even try.
if [ "${VGNAME}" != "${NEWVGNAME}" ]
then
"$LVM" vgrename ${LVM_OPTS} ${TEST_OPT} "${VGNAME}" "${NEWVGNAME}"
checkvalue $? "Unable to rename ${VGNAME} to ${NEWVGNAME}"
fi
CHANGES_MADE=1
done
#####################################################################
### Restore the old environment
#####################################################################
### set to use old lvm.conf
if [ -z "${ORIG_LVM_SYS_DIR}" ]
then
unset LVM_SYSTEM_DIR
else
LVM_SYSTEM_DIR=${ORIG_LVM_SYS_DIR}
fi
### update the device cache and make sure all
### the device nodes we need are straight
if [ ${CHANGES_MADE} -eq 1 ]
then
"$LVM" vgscan ${LVM_OPTS} --mknodes
fi
exit 0
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