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297 lines
8.3 KiB
Bash
Executable File
297 lines
8.3 KiB
Bash
Executable File
#!/usr/bin/env bash
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# Licensed to the Apache Software Foundation (ASF) under one
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# or more contributor license agreements. See the NOTICE file
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# distributed with this work for additional information
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# regarding copyright ownership. The ASF licenses this file
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# to you under the Apache License, Version 2.0 (the
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# "License"); you may not use this file except in compliance
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# with the License. You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing,
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# software distributed under the License is distributed on an
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# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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# KIND, either express or implied. See the License for the
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# specific language governing permissions and limitations
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# under the License.
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# $Id: managesnapshot.sh 11601 2010-08-11 17:26:15Z kris $ $HeadURL: svn://svn.lab.vmops.com/repos/branches/2.1.refactor/java/scripts/storage/qcow2/managesnapshot.sh $
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# managesnapshot.sh -- manage snapshots for a single disk (create, destroy, rollback, backup)
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usage() {
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printf "Usage: %s: -c <path to disk> -n <snapshot name>\n" $(basename $0) >&2
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printf "Usage: %s: -d <path to disk> -n <snapshot name>\n" $(basename $0) >&2
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printf "Usage: %s: -r <path to disk> -n <snapshot name>\n" $(basename $0) >&2
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printf "Usage: %s: -b <path to disk> -n <snapshot name> -p <dest dir> -t <dest file>\n" $(basename $0) >&2
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exit 2
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}
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qemu_img="cloud-qemu-img"
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which $qemu_img >& /dev/null
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if [ $? -gt 0 ]
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then
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which qemu-img >& /dev/null
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if [ $? -eq 0 ]
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then
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qemu_img="qemu-img"
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fi
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fi
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is_lv() {
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# Must be a block device
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if [ -b "${1}" ]; then
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# But not a volume group or physical volume
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lvm vgs "${1}" > /dev/null 2>&1 && return 1
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# And a logical volume
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lvm lvs "${1}" > /dev/null 2>&1 && return 0
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fi
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return 1
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}
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get_vg() {
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lvm lvs --noheadings --unbuffered --separator=/ "${1}" | cut -d '/' -f 2
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}
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get_lv() {
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lvm lvs --noheadings --unbuffered --separator=/ "${1}" | cut -d '/' -f 1
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}
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double_hyphens() {
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echo ${1} | sed -e "s/-/--/g"
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}
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create_snapshot() {
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local disk=$1
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local snapshotname="$2"
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local failed=0
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if [ ${dmsnapshot} = "yes" ] && is_lv ${disk}; then
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local lv=`get_lv ${disk}`
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local vg=`get_vg ${disk}`
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local lv_dm=`double_hyphens ${lv}`
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local vg_dm=`double_hyphens ${vg}`
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local lvdevice=/dev/mapper/${vg_dm}-${lv_dm}
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local lv_bytes=`blockdev --getsize64 ${lvdevice}`
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local lv_sectors=`blockdev --getsz ${lvdevice}`
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lvm lvcreate --size ${lv_bytes}b --name "${snapshotname}-cow" ${vg} >&2 || return 2
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dmsetup suspend ${vg_dm}-${lv_dm} >&2
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if dmsetup info -c --noheadings -o name ${vg_dm}-${lv_dm}-real > /dev/null 2>&1; then
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echo "0 ${lv_sectors} snapshot ${lvdevice}-real /dev/mapper/${vg_dm}-${snapshotname}--cow p 64" | \
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dmsetup create "${vg_dm}-${snapshotname}" >&2 || ( destroy_snapshot ${disk} "${snapshotname}"; return 2 )
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dmsetup resume "${vg_dm}-${snapshotname}" >&2 || ( destroy_snapshot ${disk} "${snapshotname}"; return 2 )
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else
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dmsetup table ${vg_dm}-${lv_dm} | dmsetup create ${vg_dm}-${lv_dm}-real >&2 || ( destroy_snapshot ${disk} "${snapshotname}"; return 2 )
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dmsetup resume ${vg_dm}-${lv_dm}-real >&2 || ( destroy_snapshot ${disk} "${snapshotname}"; return 2 )
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echo "0 ${lv_sectors} snapshot ${lvdevice}-real /dev/mapper/${vg_dm}-${snapshotname}--cow p 64" | \
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dmsetup create "${vg_dm}-${snapshotname}" >&2 || ( destroy_snapshot ${disk} "${snapshotname}"; return 2 )
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echo "0 ${lv_sectors} snapshot-origin ${lvdevice}-real" | \
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dmsetup load ${vg_dm}-${lv_dm} >&2 || ( destroy_snapshot ${disk} "${snapshotname}"; return 2 )
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dmsetup resume "${vg_dm}-${snapshotname}" >&2 || ( destroy_snapshot ${disk} "${snapshotname}"; return 2 )
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fi
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dmsetup resume "${vg_dm}-${lv_dm}" >&2
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elif [ -f "${disk}" ]; then
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$qemu_img snapshot -c "$snapshotname" $disk
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if [ $? -gt 0 ]
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then
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failed=2
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printf "***Failed to create snapshot $snapshotname for path $disk\n" >&2
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$qemu_img snapshot -d "$snapshotname" $disk
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if [ $? -gt 0 ]
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then
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printf "***Failed to delete snapshot $snapshotname for path $disk\n" >&2
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fi
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fi
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else
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failed=3
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printf "***Failed to create snapshot $snapshotname, undefined type $disk\n" >&2
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fi
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return $failed
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}
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destroy_snapshot() {
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local disk=$1
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local snapshotname="$2"
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local failed=0
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if is_lv ${disk}; then
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local lv=`get_lv ${disk}`
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local vg=`get_vg ${disk}`
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local lv_dm=`double_hyphens ${lv}`
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local vg_dm=`double_hyphens ${vg}`
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if [ -e /dev/mapper/${vg_dm}-${lv_dm}-real ]; then
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local dm_refcount=`dmsetup info -c --noheadings -o open ${vg_dm}-${lv_dm}-real`
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if [ ${dm_refcount} -le 2 ]; then
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dmsetup suspend ${vg_dm}-${lv_dm} >&2
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dmsetup table ${vg_dm}-${lv_dm}-real | dmsetup load ${vg_dm}-${lv_dm} >&2
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dmsetup resume ${vg_dm}-${lv_dm}
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dmsetup remove "${vg_dm}-${snapshotname}"
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dmsetup remove ${vg_dm}-${lv_dm}-real
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else
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dmsetup remove "${vg_dm}-${snapshotname}"
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fi
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else
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dmsetup remove "${vg_dm}-${snapshotname}"
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fi
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lvm lvremove -f "${vg}/${snapshotname}-cow"
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elif [ -f $disk ]; then
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$qemu_img snapshot -d "$snapshotname" $disk
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if [ $? -gt 0 ]
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then
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failed=2
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printf "Failed to delete snapshot $snapshotname for path $disk\n" >&2
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fi
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else
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failed=3
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printf "***Failed to delete snapshot $snapshotname, undefined type $disk\n" >&2
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fi
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return $failed
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}
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rollback_snapshot() {
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local disk=$1
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local snapshotname="$2"
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local failed=0
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$qemu_img snapshot -a $snapshotname $disk
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if [ $? -gt 0 ]
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then
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printf "***Failed to apply snapshot $snapshotname for path $disk\n" >&2
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failed=1
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fi
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return $failed
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}
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backup_snapshot() {
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local disk=$1
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local snapshotname="$2"
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local destPath=$3
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local destName=$4
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if [ ! -d $destPath ]
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then
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mkdir -p $destPath >& /dev/null
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if [ $? -gt 0 ]
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then
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printf "Failed to create $destPath\n" >&2
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return 3
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fi
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fi
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if [ ${dmsnapshot} = "yes" ] && is_lv ${disk}; then
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local vg=`get_vg ${disk}`
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local vg_dm=`double_hyphens ${vg}`
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local scriptdir=`dirname ${0}`
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if ! dmsetup info -c --noheadings -o name ${vg_dm}-${snapshotname} > /dev/null 2>&1; then
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printf "Disk ${disk} has no snapshot called ${snapshotname}.\n" >&2
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return 1
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fi
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${qemu_img} convert -f raw -O qcow2 "/dev/mapper/${vg_dm}-${snapshotname}" "${destPath}/${destName}" || \
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( printf "${qemu_img} failed to create backup of snapshot ${snapshotname} for disk ${disk} to ${destPath}.\n" >&2; return 2 )
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elif [ -f ${disk} ]; then
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# Does the snapshot exist?
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$qemu_img snapshot -l $disk|grep -w "$snapshotname" >& /dev/null
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if [ $? -gt 0 ]
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then
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printf "there is no $snapshotname on disk $disk\n" >&2
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return 1
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fi
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$qemu_img convert -f qcow2 -O qcow2 -s $snapshotname $disk $destPath/$destName >& /dev/null
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if [ $? -gt 0 ]
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then
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printf "Failed to backup $snapshotname for disk $disk to $destPath\n" >&2
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return 2
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fi
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else
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printf "***Failed to backup snapshot $snapshotname, undefined type $disk\n" >&2
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return 3
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fi
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return 0
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}
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#set -x
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cflag=
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dflag=
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rflag=
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bflag=
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nflag=
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pathval=
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snapshot=
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tmplName=
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deleteDir=
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dmsnapshot=no
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dmrollback=no
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while getopts 'c:d:r:n:b:p:t:f' OPTION
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do
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case $OPTION in
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c) cflag=1
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pathval="$OPTARG"
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;;
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d) dflag=1
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pathval="$OPTARG"
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;;
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r) rflag=1
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pathval="$OPTARG"
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;;
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b) bflag=1
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pathval="$OPTARG"
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;;
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n) nflag=1
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snapshot="$OPTARG"
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;;
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p) destPath="$OPTARG"
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;;
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t) tmplName="$OPTARG"
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;;
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f) deleteDir=1
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;;
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?) usage
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;;
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esac
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done
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if modprobe dm-snapshot; then
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dmsnapshot=yes
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dmsetup targets | grep -q "^snapshot-merge" && dmrollback=yes
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fi
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[ -z "${snapshot}" ] && usage
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[ -b "$pathval" ] && snapshot=`echo "${snapshot}" | md5sum -t | awk '{ print $1 }'`
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if [ "$cflag" == "1" ]
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then
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create_snapshot $pathval "$snapshot"
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exit $?
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elif [ "$dflag" == "1" ]
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then
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destroy_snapshot $pathval "$snapshot" $deleteDir
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exit $?
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elif [ "$bflag" == "1" ]
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then
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[ -z "${destPath}" -o -z "${tmplName}" ] && usage
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backup_snapshot $pathval $snapshot $destPath $tmplName
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exit $?
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elif [ "$rflag" == "1" ]
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then
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rollback_snapshot $pathval "$snapshot" $destPath
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exit $?
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fi
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exit 0
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