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Copy pathvmopsSnapshot
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Copy pathvmopsSnapshot
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executable file
·619 lines (534 loc) · 22.7 KB
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#!/usr/bin/python
# Licensed to the Apache Software Foundation (ASF) under one
# or more contributor license agreements. See the NOTICE file
# distributed with this work for additional information
# regarding copyright ownership. The ASF licenses this file
# to you under the Apache License, Version 2.0 (the
# "License"); you may not use this file except in compliance
# with the License. You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing,
# software distributed under the License is distributed on an
# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
# KIND, either express or implied. See the License for the
# specific language governing permissions and limitations
# under the License.
# Version @VERSION@
#
# A plugin for executing script needed by vmops cloud
import os, sys, time
import XenAPIPlugin
if os.path.exists("/opt/xensource/sm"):
sys.path.extend(["/opt/xensource/sm/", "/usr/local/sbin/", "/sbin/"])
if os.path.exists("/usr/lib/xcp/sm"):
sys.path.extend(["/usr/lib/xcp/sm/", "/usr/local/sbin/", "/sbin/"])
import SR, VDI, SRCommand, util, lvutil
from util import CommandException
import vhdutil
import shutil
import lvhdutil
import errno
import subprocess
import xs_errors
import cleanup
import stat
import random
import cloudstack_pluginlib as lib
import logging
lib.setup_logging("/var/log/cloud/cloud.log")
VHDUTIL = "vhd-util"
VHD_PREFIX = 'VHD-'
CLOUD_DIR = '/var/run/cloud_mount'
def echo(fn):
def wrapped(*v, **k):
name = fn.__name__
logging.debug("#### CLOUD enter %s ####" % name )
res = fn(*v, **k)
logging.debug("#### CLOUD exit %s ####" % name )
return res
return wrapped
@echo
def create_secondary_storage_folder(session, args):
local_mount_path = None
logging.debug("create_secondary_storage_folder, args: " + str(args))
try:
try:
# Mount the remote resource folder locally
remote_mount_path = args["remoteMountPath"]
local_mount_path = os.path.join(CLOUD_DIR, util.gen_uuid())
mount(remote_mount_path, local_mount_path)
# Create the new folder
new_folder = local_mount_path + "/" + args["newFolder"]
if not os.path.isdir(new_folder):
current_umask = os.umask(0)
os.makedirs(new_folder)
os.umask(current_umask)
except OSError, (errno, strerror):
errMsg = "create_secondary_storage_folder failed: errno: " + str(errno) + ", strerr: " + strerror
logging.debug(errMsg)
raise xs_errors.XenError(errMsg)
except:
errMsg = "create_secondary_storage_folder failed."
logging.debug(errMsg)
raise xs_errors.XenError(errMsg)
finally:
if local_mount_path != None:
# Unmount the local folder
umount(local_mount_path)
# Remove the local folder
os.system("rmdir " + local_mount_path)
return "1"
@echo
def delete_secondary_storage_folder(session, args):
local_mount_path = None
logging.debug("delete_secondary_storage_folder, args: " + str(args))
try:
try:
# Mount the remote resource folder locally
remote_mount_path = args["remoteMountPath"]
local_mount_path = os.path.join(CLOUD_DIR, util.gen_uuid())
mount(remote_mount_path, local_mount_path)
# Delete the specified folder
folder = local_mount_path + "/" + args["folder"]
if os.path.isdir(folder):
os.system("rm -f " + folder + "/*")
os.system("rmdir " + folder)
except OSError, (errno, strerror):
errMsg = "delete_secondary_storage_folder failed: errno: " + str(errno) + ", strerr: " + strerror
logging.debug(errMsg)
raise xs_errors.XenError(errMsg)
except:
errMsg = "delete_secondary_storage_folder failed."
logging.debug(errMsg)
raise xs_errors.XenError(errMsg)
finally:
if local_mount_path != None:
# Unmount the local folder
umount(local_mount_path)
# Remove the local folder
os.system("rmdir " + local_mount_path)
return "1"
@echo
def post_create_private_template(session, args):
local_mount_path = None
try:
try:
# get local template folder
templatePath = args["templatePath"]
local_mount_path = os.path.join(CLOUD_DIR, util.gen_uuid())
mount(templatePath, local_mount_path)
# Retrieve args
filename = args["templateFilename"]
name = args["templateName"]
description = args["templateDescription"]
checksum = args["checksum"]
file_size = args["size"]
virtual_size = args["virtualSize"]
template_id = args["templateId"]
# Create the template.properties file
template_properties_install_path = local_mount_path + "/template.properties"
f = open(template_properties_install_path, "w")
f.write("filename=" + filename + "\n")
f.write("vhd=true\n")
f.write("id=" + template_id + "\n")
f.write("vhd.filename=" + filename + "\n")
f.write("public=false\n")
f.write("uniquename=" + name + "\n")
f.write("vhd.virtualsize=" + virtual_size + "\n")
f.write("virtualsize=" + virtual_size + "\n")
f.write("checksum=" + checksum + "\n")
f.write("hvm=true\n")
f.write("description=" + description + "\n")
f.write("vhd.size=" + str(file_size) + "\n")
f.write("size=" + str(file_size) + "\n")
f.close()
logging.debug("Created template.properties file")
# Set permissions
permissions = stat.S_IREAD | stat.S_IWRITE | stat.S_IRGRP | stat.S_IWGRP | stat.S_IROTH | stat.S_IWOTH
os.chmod(template_properties_install_path, permissions)
logging.debug("Set permissions on template and template.properties")
except:
errMsg = "post_create_private_template failed."
logging.debug(errMsg)
raise xs_errors.XenError(errMsg)
finally:
if local_mount_path != None:
# Unmount the local folder
umount(local_mount_path)
# Remove the local folder
os.system("rmdir " + local_mount_path)
return "1"
def isfile(path, isISCSI):
errMsg = ''
exists = True
if isISCSI:
exists = checkVolumeAvailablility(path)
else:
exists = os.path.isfile(path)
if not exists:
errMsg = "File " + path + " does not exist."
logging.debug(errMsg)
raise xs_errors.XenError(errMsg)
return errMsg
def copyfile(fromFile, toFile, isISCSI):
logging.debug("Starting to copy " + fromFile + " to " + toFile)
errMsg = ''
if isISCSI:
bs = "4M"
else:
bs = "128k"
try:
cmd = ['dd', 'if=' + fromFile, 'iflag=direct', 'of=' + toFile, 'oflag=direct', 'bs=' + bs]
txt = util.pread2(cmd)
except:
try:
os.system("rm -f " + toFile)
except:
txt = ''
txt = ''
errMsg = "Error while copying " + fromFile + " to " + toFile + " in secondary storage"
logging.debug(errMsg)
raise xs_errors.XenError(errMsg)
logging.debug("Successfully copied " + fromFile + " to " + toFile)
return errMsg
def chdir(path):
try:
os.chdir(path)
except OSError, (errno, strerror):
errMsg = "Unable to chdir to " + path + " because of OSError with errno: " + str(errno) + " and strerr: " + strerror
logging.debug(errMsg)
raise xs_errors.XenError(errMsg)
logging.debug("Chdired to " + path)
return
def scanParent(path):
# Do a scan for the parent for ISCSI volumes
# Note that the parent need not be visible on the XenServer
parentUUID = ''
try:
lvName = os.path.basename(path)
dirname = os.path.dirname(path)
vgName = os.path.basename(dirname)
vhdInfo = vhdutil.getVHDInfoLVM(lvName, lvhdutil.extractUuid, vgName)
parentUUID = vhdInfo.parentUuid
except:
errMsg = "Could not get vhd parent of " + path
logging.debug(errMsg)
raise xs_errors.XenError(errMsg)
return parentUUID
def getParent(path, isISCSI):
parentUUID = ''
try :
if isISCSI:
parentUUID = vhdutil.getParent(path, lvhdutil.extractUuid)
else:
parentUUID = vhdutil.getParent(path, cleanup.FileVDI.extractUuid)
except:
errMsg = "Could not get vhd parent of " + path
logging.debug(errMsg)
raise xs_errors.XenError(errMsg)
return parentUUID
def getParentOfSnapshot(snapshotUuid, primarySRPath, isISCSI):
snapshotVHD = getVHD(snapshotUuid, isISCSI)
snapshotPath = os.path.join(primarySRPath, snapshotVHD)
baseCopyUuid = ''
if isISCSI:
checkVolumeAvailablility(snapshotPath)
baseCopyUuid = scanParent(snapshotPath)
else:
baseCopyUuid = getParent(snapshotPath, isISCSI)
logging.debug("Base copy of snapshotUuid: " + snapshotUuid + " is " + baseCopyUuid)
return baseCopyUuid
def setParent(parent, child):
try:
cmd = [VHDUTIL, "modify", "-p", parent, "-n", child]
txt = util.pread2(cmd)
except:
errMsg = "Unexpected error while trying to set parent of " + child + " to " + parent
logging.debug(errMsg)
raise xs_errors.XenError(errMsg)
logging.debug("Successfully set parent of " + child + " to " + parent)
return
def rename(originalVHD, newVHD):
try:
os.rename(originalVHD, newVHD)
except OSError, (errno, strerror):
errMsg = "OSError while renaming " + origiinalVHD + " to " + newVHD + "with errno: " + str(errno) + " and strerr: " + strerror
logging.debug(errMsg)
raise xs_errors.XenError(errMsg)
return
def makedirs(path):
if not os.path.isdir(path):
try:
os.makedirs(path)
except OSError, (errno, strerror):
umount(path)
if os.path.isdir(path):
return
errMsg = "OSError while creating " + path + " with errno: " + str(errno) + " and strerr: " + strerror
logging.debug(errMsg)
raise xs_errors.XenError(errMsg)
return
def mount(remoteDir, localDir):
makedirs(localDir)
options = "soft,tcp,timeo=133,retrans=1"
try:
cmd = ['mount', '-o', options, remoteDir, localDir]
txt = util.pread2(cmd)
except:
txt = ''
errMsg = "Unexpected error while trying to mount " + remoteDir + " to " + localDir
logging.debug(errMsg)
raise xs_errors.XenError(errMsg)
logging.debug("Successfully mounted " + remoteDir + " to " + localDir)
return
def umount(localDir):
try:
cmd = ['umount', localDir]
util.pread2(cmd)
except CommandException:
errMsg = "CommandException raised while trying to umount " + localDir
logging.debug(errMsg)
raise xs_errors.XenError(errMsg)
logging.debug("Successfully unmounted " + localDir)
return
def mountSnapshotsDir(secondaryStorageMountPath, localMountPointPath, path):
# The aim is to mount secondaryStorageMountPath on
# And create <accountId>/<instanceId> dir on it, if it doesn't exist already.
# Assuming that secondaryStorageMountPath exists remotely
# Just mount secondaryStorageMountPath/<relativeDir>/SecondaryStorageHost/ everytime
# Never unmount.
# path is like "snapshots/account/volumeId", we mount secondary_storage:/snapshots
relativeDir = path.split("/")[0]
restDir = "/".join(path.split("/")[1:])
snapshotsDir = os.path.join(secondaryStorageMountPath, relativeDir)
makedirs(localMountPointPath)
# if something is not mounted already on localMountPointPath,
# mount secondaryStorageMountPath on localMountPath
if os.path.ismount(localMountPointPath):
# There is more than one secondary storage per zone.
# And we are mounting each sec storage under a zone-specific directory
# So two secondary storage snapshot dirs will never get mounted on the same point on the same XenServer.
logging.debug("The remote snapshots directory has already been mounted on " + localMountPointPath)
else:
mount(snapshotsDir, localMountPointPath)
# Create accountId/instanceId dir on localMountPointPath, if it doesn't exist
backupsDir = os.path.join(localMountPointPath, restDir)
makedirs(backupsDir)
return backupsDir
def unmountAll(path):
try:
for dir in os.listdir(path):
if dir.isdigit():
logging.debug("Unmounting Sub-Directory: " + dir)
localMountPointPath = os.path.join(path, dir)
umount(localMountPointPath)
except:
logging.debug("Ignoring the error while trying to unmount the snapshots dir")
@echo
def unmountSnapshotsDir(session, args):
dcId = args['dcId']
localMountPointPath = os.path.join(CLOUD_DIR, dcId)
localMountPointPath = os.path.join(localMountPointPath, "snapshots")
unmountAll(localMountPointPath)
try:
umount(localMountPointPath)
except:
logging.debug("Ignoring the error while trying to unmount the snapshots dir.")
return "1"
def getPrimarySRPath(primaryStorageSRUuid, isISCSI):
if isISCSI:
primarySRDir = lvhdutil.VG_PREFIX + primaryStorageSRUuid
return os.path.join(lvhdutil.VG_LOCATION, primarySRDir)
else:
return os.path.join(SR.MOUNT_BASE, primaryStorageSRUuid)
def getBackupVHD(UUID):
return UUID + '.' + SR.DEFAULT_TAP
def getVHD(UUID, isISCSI):
if isISCSI:
return VHD_PREFIX + UUID
else:
return UUID + '.' + SR.DEFAULT_TAP
def getIsTrueString(stringValue):
booleanValue = False
if (stringValue and stringValue == 'true'):
booleanValue = True
return booleanValue
def makeUnavailable(uuid, primarySRPath, isISCSI):
if not isISCSI:
return
VHD = getVHD(uuid, isISCSI)
path = os.path.join(primarySRPath, VHD)
manageAvailability(path, '-an')
return
def manageAvailability(path, value):
if path.__contains__("/var/run/sr-mount"):
return
logging.debug("Setting availability of " + path + " to " + value)
try:
cmd = ['/usr/sbin/lvchange', value, path]
util.pread2(cmd)
except: #CommandException, (rc, cmdListStr, stderr):
#errMsg = "CommandException thrown while executing: " + cmdListStr + " with return code: " + str(rc) + " and stderr: " + stderr
errMsg = "Unexpected exception thrown by lvchange"
logging.debug(errMsg)
if value == "-ay":
# Raise an error only if we are trying to make it available.
# Just warn if we are trying to make it unavailable after the
# snapshot operation is done.
raise xs_errors.XenError(errMsg)
return
def checkVolumeAvailablility(path):
try:
if not isVolumeAvailable(path):
# The VHD file is not available on XenSever. The volume is probably
# inactive or detached.
# Do lvchange -ay to make it available on XenServer
manageAvailability(path, '-ay')
except:
errMsg = "Could not determine status of ISCSI path: " + path
logging.debug(errMsg)
raise xs_errors.XenError(errMsg)
success = False
i = 0
while i < 6:
i = i + 1
# Check if the vhd is actually visible by checking for the link
# set isISCSI to true
success = isVolumeAvailable(path)
if success:
logging.debug("Made vhd: " + path + " available and confirmed that it is visible")
break
# Sleep for 10 seconds before checking again.
time.sleep(10)
# If not visible within 1 min fail
if not success:
logging.debug("Could not make vhd: " + path + " available despite waiting for 1 minute. Does it exist?")
return success
def isVolumeAvailable(path):
# Check if iscsi volume is available on this XenServer.
status = "0"
try:
p = subprocess.Popen(["/bin/bash", "-c", "if [ -L " + path + " ]; then echo 1; else echo 0;fi"], stdout=subprocess.PIPE)
status = p.communicate()[0].strip("\n")
except:
errMsg = "Could not determine status of ISCSI path: " + path
logging.debug(errMsg)
raise xs_errors.XenError(errMsg)
return (status == "1")
def getVhdParent(session, args):
logging.debug("getParent with " + str(args))
primaryStorageSRUuid = args['primaryStorageSRUuid']
snapshotUuid = args['snapshotUuid']
isISCSI = getIsTrueString(args['isISCSI'])
primarySRPath = getPrimarySRPath(primaryStorageSRUuid, isISCSI)
logging.debug("primarySRPath: " + primarySRPath)
baseCopyUuid = getParentOfSnapshot(snapshotUuid, primarySRPath, isISCSI)
return baseCopyUuid
def getSnapshotSize(session, args):
primaryStorageSRUuid = args['primaryStorageSRUuid']
snapshotUuid = args['snapshotUuid']
isISCSI = getIsTrueString(args['isISCSI'])
primarySRPath = getPrimarySRPath(primaryStorageSRUuid, isISCSI)
logging.debug("primarySRPath: " + primarySRPath)
snapshotVHD = getVHD(snapshotUuid, isISCSI)
snapshotPath = os.path.join(primarySRPath, snapshotVHD)
physicalSize = vhdutil.getSizePhys(snapshotPath)
return str(physicalSize)
def backupSnapshot(session, args):
logging.debug("Called backupSnapshot with " + str(args))
primaryStorageSRUuid = args['primaryStorageSRUuid']
secondaryStorageMountPath = args['secondaryStorageMountPath']
snapshotUuid = args['snapshotUuid']
prevBackupUuid = args['prevBackupUuid']
backupUuid = args['backupUuid']
isISCSI = getIsTrueString(args['isISCSI'])
path = args['path']
localMountPoint = args['localMountPoint']
primarySRPath = getPrimarySRPath(primaryStorageSRUuid, isISCSI)
logging.debug("primarySRPath: " + primarySRPath)
baseCopyUuid = getParentOfSnapshot(snapshotUuid, primarySRPath, isISCSI)
baseCopyVHD = getVHD(baseCopyUuid, isISCSI)
baseCopyPath = os.path.join(primarySRPath, baseCopyVHD)
logging.debug("Base copy path: " + baseCopyPath)
# Mount secondary storage mount path on XenServer along the path
# /var/run/sr-mount/<dcId>/snapshots/ and create <accountId>/<volumeId> dir
# on it.
backupsDir = mountSnapshotsDir(secondaryStorageMountPath, localMountPoint, path)
logging.debug("Backups dir " + backupsDir)
prevBackupUuid = prevBackupUuid.split("/")[-1]
# Check existence of snapshot on primary storage
isfile(baseCopyPath, isISCSI)
physicalSize = vhdutil.getSizePhys(baseCopyPath)
if prevBackupUuid:
# Check existence of prevBackupFile
prevBackupVHD = getBackupVHD(prevBackupUuid)
prevBackupFile = os.path.join(backupsDir, prevBackupVHD)
isfile(prevBackupFile, False)
# copy baseCopyPath to backupsDir with new uuid
backupVHD = getBackupVHD(backupUuid)
backupFile = os.path.join(backupsDir, backupVHD)
logging.debug("Back up " + baseCopyUuid + " to Secondary Storage as " + backupUuid)
copyfile(baseCopyPath, backupFile, isISCSI)
vhdutil.setHidden(backupFile, False)
# Because the primary storage is always scanned, the parent of this base copy is always the first base copy.
# We don't want that, we want a chain of VHDs each of which is a delta from the previous.
# So set the parent of the current baseCopyVHD to prevBackupVHD
if prevBackupUuid:
# If there was a previous snapshot
setParent(prevBackupFile, backupFile)
txt = "1#" + backupUuid + "#" + str(physicalSize)
return txt
@echo
def deleteSnapshotBackup(session, args):
logging.debug("Calling deleteSnapshotBackup with " + str(args))
secondaryStorageMountPath = args['secondaryStorageMountPath']
backupUUID = args['backupUUID']
path = args['path']
localMountPoint = args['localMountPoint']
backupsDir = mountSnapshotsDir(secondaryStorageMountPath, localMountPoint, path)
# chdir to the backupsDir for convenience
chdir(backupsDir)
backupVHD = getBackupVHD(backupUUID)
logging.debug("checking existence of " + backupVHD)
# The backupVHD is on secondary which is NFS and not ISCSI.
if not os.path.isfile(backupVHD):
logging.debug("backupVHD " + backupVHD + "does not exist. Not trying to delete it")
return "1"
logging.debug("backupVHD " + backupVHD + " exists.")
# Just delete the backupVHD
try:
os.remove(backupVHD)
except OSError, (errno, strerror):
errMsg = "OSError while removing " + backupVHD + " with errno: " + str(errno) + " and strerr: " + strerror
logging.debug(errMsg)
raise xs_errors.XenError(errMsg)
return "1"
@echo
def revert_memory_snapshot(session, args):
logging.debug("Calling revert_memory_snapshot with " + str(args))
vmName = args['vmName']
snapshotUUID = args['snapshotUUID']
oldVmUuid = args['oldVmUuid']
snapshotMemory = args['snapshotMemory']
hostUUID = args['hostUUID']
try:
cmd = '''xe vbd-list vm-uuid=%s | grep 'vdi-uuid' | grep -v 'not in database' | sed -e 's/vdi-uuid ( RO)://g' ''' % oldVmUuid
vdiUuids = os.popen(cmd).read().split()
cmd2 = '''xe vm-param-get param-name=power-state uuid=''' + oldVmUuid
if os.popen(cmd2).read().split()[0] != 'halted':
os.system("xe vm-shutdown force=true vm=" + vmName)
os.system("xe vm-destroy uuid=" + oldVmUuid)
os.system("xe snapshot-revert snapshot-uuid=" + snapshotUUID)
if snapshotMemory == 'true':
os.system("xe vm-resume vm=" + vmName + " on=" + hostUUID)
for vdiUuid in vdiUuids:
os.system("xe vdi-destroy uuid=" + vdiUuid)
except OSError, (errno, strerror):
errMsg = "OSError while reverting vm " + vmName + " to snapshot " + snapshotUUID + " with errno: " + str(errno) + " and strerr: " + strerror
logging.debug(errMsg)
raise xs_errors.XenError(errMsg)
return "0"
if __name__ == "__main__":
XenAPIPlugin.dispatch({"getVhdParent":getVhdParent, "create_secondary_storage_folder":create_secondary_storage_folder, "delete_secondary_storage_folder":delete_secondary_storage_folder, "post_create_private_template":post_create_private_template, "backupSnapshot": backupSnapshot, "deleteSnapshotBackup": deleteSnapshotBackup, "unmountSnapshotsDir": unmountSnapshotsDir, "revert_memory_snapshot":revert_memory_snapshot, "getSnapshotSize":getSnapshotSize})