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lvm2/scripts/vgimportclone.sh

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#!/bin/sh
# 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}
"$RM" -rf -- "${TMP_LVM_SYSTEM_DIR}"
}
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=`"$MKTEMP" -d -t snap.XXXXXXXX`
IMPORT=0
DEBUG=""
VERBOSE=""
DEVNO=0
if [ -n "${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 ${LVM_OPTS}"
shift
;;
-v|--verbose)
if [ -z "$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
# process remaining arguments (which should be disks)
for ARG
do
if [ -b "$ARG" ]
then
ln -s "$ARG" ${TMP_LVM_SYSTEM_DIR}/vgimport${DEVNO}
DISKS="${DISKS} ${TMP_LVM_SYSTEM_DIR}/vgimport${DEVNO}"
DEVNO=$((${DEVNO}+1))
else
die 3 "$ARG is not a block device."
fi
done
# setup LVM_OPTS
if [ -n "${DEBUG}" -o -n "${VERBOSE}" ]
then
LVM_OPTS="${LVM_OPTS} ${DEBUG} ${VERBOSE}"
fi
### check we have suitable values for important variables
if [ -z "${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
"$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 \
'/^[[:space:]]*filter[[:space:]]*=/{print ENVIRON["FILTER"];next} \
/^[[:space:]]*scan[[:space:]]*=/{print "scan = [ \"" DEV "\" ]";next} \
/^[[:space:]]*cache[[:space:]]*=/{print "cache = \"" CACHE "\"";next} \
/^[[:space:]]*cache_dir[[:space:]]*=/{print "cache_dir = \"" CACHE_DIR "\"";next} \
{print $0}' > ${LVMCONF}
checkvalue $? "Failed to generate ${LVMCONF}"
# verify the config contains the filter, scan and cache_dir (or cache) config keywords
"$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(/^[[:space:]]*/,"")} \
{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} incomplete, skipping."
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 ${NEWVGNAME}"
fi
done
#####################################################################
### Restore the old environment
#####################################################################
### set to use old lvm.conf
LVM_SYSTEM_DIR=${ORIG_LVM_SYS_DIR}
### update the device cache and make sure all
### the device nodes we need are straight
"$LVM" vgscan ${LVM_OPTS} --mknodes
exit 0
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