8f4b53da68
And pep8 fixing (suddenly this pull request was rejected by jenkins and pep8. so this commit also contains some small style changes for pep8.) Currently the default value for logging is INFO and it is hardcoded. Additional command will be helpful for debug/development process. Implements blueprint: logging-level-cli Change-Id: I1105e3da277e2a948f3ff50b04751169eddf26ed
120 lines
4.3 KiB
Python
120 lines
4.3 KiB
Python
# (c) Copyright 2014,2015 Hewlett-Packard Development Company, L.P.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# 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, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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import logging
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import os
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from freezer import utils
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from freezer import winutils
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def vss_create_shadow_copy(windows_volume):
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"""
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Create a new shadow copy for the specified volume
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Windows registry path for vssadmin:
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HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\VSS\Settings
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MaxShadowCopies
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Windows is limited in how many shadow copies can create per volume.
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The default amount of shadow copies is 64, the minimum is 1 and the maxi-
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mum is 512, if you want to change the default value you need to add/edit
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the key MaxShadowCopies and set the amount of shadow copies per volume.
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MinDiffAreaFileSize
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The minimum size of the shadow copy storage area is a per-computer setting
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that can be specified by using the MinDiffAreaFileSize registry value.
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If the MinDiffAreaFileSize registry value is not set, the minimum size of
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the shadow copy storage area is 32 MB for volumes that are smaller than
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500 MB and 320 MB for volumes that are larger than 500 MB.
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If you have not set a maximum size, there is no limit to the amount
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of space that can be used.
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If the MinDiffAreaFileSize registry value does not exist, the backup
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application can create it under the following registry key:
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HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\VolSnap
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Freezer create a shadow copy for each time the client runs it's been
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removed after the backup is complete.
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:param volume: The letter of the windows volume e.g. c:\\
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:return: shadow_id: XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX
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:return: shadow_path: shadow copy path
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"""
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shadow_path = None
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shadow_id = None
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vss_delete_symlink(windows_volume)
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with winutils.DisableFileSystemRedirection():
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path = os.path.dirname(os.path.abspath(__file__))
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script = '{0}\\scripts\\vss.ps1'.format(path)
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(out, err) = utils.create_subprocess(
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['powershell.exe', '-executionpolicy', 'unrestricted',
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'-command', script, '-volume', windows_volume])
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if err != '':
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raise Exception('[*] Error creating a new shadow copy on {0}'
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', error {1}' .format(windows_volume, err))
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for line in out.split('\n'):
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if 'symbolic' in line:
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shadow_path = line.split('>>')[1].strip()
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if '__RELPATH' in line:
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shadow_id = line.split('=')[1].strip().lower() + '}'
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shadow_id = shadow_id[1:]
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logging.info('[*] Created shadow copy {0}'.
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format(shadow_id))
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return shadow_path, shadow_id
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def vss_delete_shadow_copy(shadow_id, windows_volume):
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"""
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Delete a shadow copy from the volume with the given shadow_id
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:param shadow_id: XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX
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:return: bool
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"""
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with winutils.DisableFileSystemRedirection():
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cmd = ['vssadmin', 'delete', 'shadows',
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'/shadow={0}'.format(shadow_id), '/quiet']
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(out, err) = utils.create_subprocess(cmd)
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if err != '':
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raise Exception('[*] Error deleting shadow copy with id {0}'
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', error {1}' .format(shadow_id, err))
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vss_delete_symlink(windows_volume)
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logging.info('[*] Deleting shadow copy {0}'.
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format(shadow_id))
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return True
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def vss_delete_symlink(windows_volume):
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"""Delete shadow copy symlink on the file system"""
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path = os.path.join(windows_volume, 'freezer_shadowcopy')
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try:
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if os.path.exists(path):
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os.rmdir(path)
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except Exception:
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logging.error('Failed to delete shadow copy symlink {0}'.
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format(os.path.join(windows_volume,
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'freezer_shadowcopy')))
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