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# vim: tabstop=4 shiftwidth=4 softtabstop=4
#
# Copyright 2013 Cloudbase Solutions Srl
# All Rights Reserved.
#
# Licensed 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.
import os
import shutil
from nova.openstack.common.gettextutils import _
from nova.openstack.common import log as logging
from nova import utils
from oslo.config import cfg
LOG = logging.getLogger(__name__)
hyperv_opts = [
cfg.StrOpt('instances_path_share',
default="",
help='The name of a Windows share name mapped to the '
'"instances_path" dir and used by the resize feature '
'to copy files to the target host. If left blank, an '
'administrative share will be used, looking for the same '
'"instances_path" used locally'),
]
CONF = cfg.CONF
CONF.register_opts(hyperv_opts, 'hyperv')
CONF.import_opt('instances_path', 'nova.compute.manager')
class PathUtils(object):
def open(self, path, mode):
"""Wrapper on __builtin__.open used to simplify unit testing."""
import __builtin__
return __builtin__.open(path, mode)
def exists(self, path):
return os.path.exists(path)
def makedirs(self, path):
os.makedirs(path)
def remove(self, path):
os.remove(path)
def rename(self, src, dest):
os.rename(src, dest)
def copyfile(self, src, dest):
self.copy(src, dest)
def copy(self, src, dest):
# With large files this is 2x-3x faster than shutil.copy(src, dest),
# especially when copying to a UNC target.
# shutil.copyfileobj(...) with a proper buffer is better than
# shutil.copy(...) but still 20% slower than a shell copy.
# It can be replaced with Win32 API calls to avoid the process
# spawning overhead.
output, ret = utils.execute('cmd.exe', '/C', 'copy', '/Y', src, dest)
if ret:
raise IOError(_('The file copy from %(src)s to %(dest)s failed')
% {'src': src, 'dest': dest})
def rmtree(self, path):
shutil.rmtree(path)
def get_instances_dir(self, remote_server=None):
local_instance_path = os.path.normpath(CONF.instances_path)
if remote_server:
if CONF.hyperv.instances_path_share:
path = CONF.hyperv.instances_path_share
else:
# Use an administrative share
path = local_instance_path.replace(':', '$')
return ('\\\\%(remote_server)s\\%(path)s' %
{'remote_server': remote_server, 'path': path})
else:
return local_instance_path
def _check_create_dir(self, path):
if not self.exists(path):
LOG.debug(_('Creating directory: %s') % path)
self.makedirs(path)
def _check_remove_dir(self, path):
if self.exists(path):
LOG.debug(_('Removing directory: %s') % path)
self.rmtree(path)
def _get_instances_sub_dir(self, dir_name, remote_server=None,
create_dir=True, remove_dir=False):
instances_path = self.get_instances_dir(remote_server)
path = os.path.join(instances_path, dir_name)
if remove_dir:
self._check_remove_dir(path)
if create_dir:
self._check_create_dir(path)
return path
def get_instance_migr_revert_dir(self, instance_name, create_dir=False,
remove_dir=False):
dir_name = '%s_revert' % instance_name
return self._get_instances_sub_dir(dir_name, None, create_dir,
remove_dir)
def get_instance_dir(self, instance_name, remote_server=None,
create_dir=True, remove_dir=False):
return self._get_instances_sub_dir(instance_name, remote_server,
create_dir, remove_dir)
def _lookup_vhd_path(self, instance_name, vhd_path_func):
vhd_path = None
for format_ext in ['vhd', 'vhdx']:
test_path = vhd_path_func(instance_name, format_ext)
if self.exists(test_path):
vhd_path = test_path
break
return vhd_path
def lookup_root_vhd_path(self, instance_name):
return self._lookup_vhd_path(instance_name, self.get_root_vhd_path)
def lookup_ephemeral_vhd_path(self, instance_name):
return self._lookup_vhd_path(instance_name,
self.get_ephemeral_vhd_path)
def get_root_vhd_path(self, instance_name, format_ext):
instance_path = self.get_instance_dir(instance_name)
return os.path.join(instance_path, 'root.' + format_ext.lower())
def get_ephemeral_vhd_path(self, instance_name, format_ext):
instance_path = self.get_instance_dir(instance_name)
return os.path.join(instance_path, 'ephemeral.' + format_ext.lower())
def get_base_vhd_dir(self):
return self._get_instances_sub_dir('_base')
def get_export_dir(self, instance_name):
dir_name = os.path.join('export', instance_name)
return self._get_instances_sub_dir(dir_name, create_dir=True,
remove_dir=True)
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