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606902ff09
Status 11931: resolved fixed Reviewed-By: Nitin Conflicts: scripts/storage/qcow2/createtmplt.sh
287 lines
8.8 KiB
Bash
Executable File
287 lines
8.8 KiB
Bash
Executable File
#!/usr/bin/env bash
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# Copyright (C) 2011 Citrix Systems, Inc. All rights reserved
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#
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# This software is licensed under the GNU General Public License v3 or later.
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#
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# It is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or any later version.
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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#
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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)
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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 name>\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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create_snapshot() {
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local disk=$1
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local snapshotname="$2"
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local failed=0
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if [ -b "${disk}" ] && lvm lvs "${disk}" >/dev/null 2>&1; then
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local lv=$( lvm lvs --noheadings --unbuffered --separator=/ "${disk}" 2>/dev/null | sed 's|^[[:space:]]\+||' )
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local lvname=$( echo "${lv}" | awk -F/ '{ print $1 }' )
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local vgname=$( echo "${lv}" | awk -F/ '{ print $2 }' )
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local lvdmname=$( echo "${lvname}" | sed 's|-|--|g' )
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local vgdmname=$( echo "${vgname}" | sed 's|-|--|g' )
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local blockdevname="/dev/mapper/${vgdmname}-${lvdmname}"
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local blockdevsnap="/dev/mapper/${vgdmname}-${snapshotname}"
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local blockdevsize=$( blockdev --getsz "${blockdevname}" )
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lvm lvcreate --name "${snapshotname}-cow" --size "$(blockdev --getsize64 ${blockdevname})b" "${vgname}" >&2 || return 1
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dmsetup suspend "${vgdmname}-${lvdmname}" >&2
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[ $? -ne 0 ] && destroy_snapshot "${disk}" "${snapshotname}" && return 1
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if dmsetup table | awk -v e=1 -v tbl="${vgdmname}-${lvdmname}-real:" '$1 == tbl { e=0 }; END { exit e }'; then
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dmsetup create "${vgdmname}-${snapshotname}" --notable >&2
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[ $? -ne 0 ] && destroy_snapshot "${disk}" "${snapshotname}" && return 1
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echo "0 ${blockdevsize} snapshot ${blockdevname}-real ${blockdevsnap}--cow p 64" | \
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dmsetup load "${vgdmname}-${snapshotname}" >&2
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[ $? -ne 0 ] && destroy_snapshot "${disk}" "${snapshotname}" && return 1
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dmsetup resume "${vgdmname}-${snapshotname}" >&2
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[ $? -ne 0 ] && destroy_snapshot "${disk}" "${snapshotname}" && return 1
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else
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dmsetup create "${vgdmname}-${lvdmname}-real" --notable >&2
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[ $? -ne 0 ] && destroy_snapshot "${disk}" "${snapshotname}" && return 1
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dmsetup table "${vgdmname}-${lvdmname}" | dmsetup load "${vgdmname}-${lvdmname}-real" >&2
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[ $? -ne 0 ] && destroy_snapshot "${disk}" "${snapshotname}" && return 1
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dmsetup resume "${vgdmname}-${lvdmname}-real" >&2
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[ $? -ne 0 ] && destroy_snapshot "${disk}" "${snapshotname}" && return 1
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dmsetup create "${vgdmname}-${snapshotname}" --notable >&2
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[ $? -ne 0 ] && destroy_snapshot "${disk}" "${snapshotname}" && return 1
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echo "0 ${blockdevsize} snapshot ${blockdevname}-real ${blockdevsnap}--cow p 64" | \
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dmsetup load "${vgdmname}-${snapshotname}" >&2
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[ $? -ne 0 ] && destroy_snapshot "${disk}" "${snapshotname}" && return 1
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echo "0 ${blockdevsize} snapshot-origin ${blockdevname}-real" | \
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dmsetup load "${vgdmname}-${lvdmname}"
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[ $? -ne 0 ] && destroy_snapshot "${disk}" "${snapshotname}" && return 1
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dmsetup resume "${vgdmname}-${snapshotname}" >&2
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[ $? -ne 0 ] && destroy_snapshot "${disk}" "${snapshotname}" && return 1
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fi
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dmsetup resume "${vgdmname}-${lvdmname}" >&2
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[ $? -ne 0 ] && destroy_snapshot "${disk}" "${snapshotname}" && return 1
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elif [ -f "${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 [ -b ${disk} ]; then
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local lvname=$( echo "${disk}" | awk -F/ '{ print $(NF) }' ) # '
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local vgname=$( echo "${disk}" | awk -F/ '{ print $(NF-1) }' ) # '
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local lvdmname=$( echo "${lvname}" | sed 's|-|--|g' )
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local vgdmname=$( echo "${vgname}" | sed 's|-|--|g' )
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if [ $( dmsetup --columns --noheadings --separator=: info "${vgdmname}-${lvdmname}-real" | awk -F: '{ print $5 }' ) -le 2 ]; then
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dmsetup suspend "${vgdmname}-${lvdmname}" >&2
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dmsetup table "${vgdmname}-${lvdmname}-real" | dmsetup load "${vgdmname}-${lvdmname}" >&2
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dmsetup resume "${vgdmname}-${lvdmname}" >&2
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dmsetup remove "${vgdmname}-${snapshotname}" >&2
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dmsetup remove "${vgdmname}-${lvdmname}-real" >&2
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else
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dmsetup remove "${vgdmname}-${snapshotname}" >&2
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fi
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lvm lvremove -f "${vgname}/${snapshotname}-cow" >&2
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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" >&2
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return 3
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fi
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fi
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if [ -b ${disk} ] && lvm lvs "${disk}" >/dev/null 2>&1; then
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local lv=$( lvm lvs --noheadings --unbuffered --separator=/ "${disk}" 2>/dev/null | sed 's|^[[:space:]]\+||' )
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local vgname=$( echo "${lv}" | awk -F/ '{ print $2 }' )
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local vgdmname=$( echo "${vgname}" | sed 's|-|--|g' )
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if [ -x "$( dirname $0 )/raw2qcow2.sh" ]; then
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"$( dirname $0 )/raw2qcow2.sh" "/dev/mapper/${vgdmname}-${snapshotname}" "${destPath}/${destName}"
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else
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$qemu_img convert -f raw -O qcow2 "/dev/mapper/${vgdmname}-${snapshotname}" "${destPath}/${destName}"
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fi
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return 0
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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 $disk" >&2
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return 1
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fi
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$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" >&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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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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[ -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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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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