106 lines
3.5 KiB
Python
106 lines
3.5 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 ctypes
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import json
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import logging
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import os
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import six
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import sys
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from freezer.utils import create_subprocess
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def is_windows():
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"""
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:return: True if the running platform is windows
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"""
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return True if sys.platform == 'win32' else False
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class DisableFileSystemRedirection:
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"""
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When a 32 bit program runs on a 64 bit operating system the paths
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to C:/Windows/System32 automatically get redirected to the 32 bit
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version (C:/Windows/SysWow64), if you really do need to access the
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contents of System32, you need to disable the file system redirector first.
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"""
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def __init__(self):
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if is_windows():
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self._disable = ctypes.windll.kernel32.Wow64DisableWow64FsRedirection
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self._revert = ctypes.windll.kernel32.Wow64RevertWow64FsRedirection
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else:
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raise Exception("Useless if not windows")
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def __enter__(self):
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self.old_value = ctypes.c_long()
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self.success = self._disable(ctypes.byref(self.old_value))
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def __exit__(self, type, value, traceback):
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if self.success:
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self._revert(self.old_value)
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def use_shadow(to_backup, windows_volume):
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""" add the shadow path to the backup directory """
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return to_backup.replace(windows_volume, '{0}freezer_shadowcopy\\'
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.format(windows_volume))
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def stop_sql_server(sql_server_instance):
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""" Stop a SQL Server instance to perform the backup of the db files """
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logging.info('[*] Stopping SQL Server for backup')
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with DisableFileSystemRedirection():
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cmd = 'net stop "SQL Server ({0})"'\
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.format(sql_server_instance)
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(out, err) = create_subprocess(cmd)
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if err != '':
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raise Exception('[*] Error while stopping SQL Server,'
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', error {0}'.format(err))
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def start_sql_server(sql_server_instance):
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""" Start the SQL Server instance after the backup is completed """
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with DisableFileSystemRedirection():
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cmd = 'net start "SQL Server ({0})"'.format(sql_server_instance)
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(out, err) = create_subprocess(cmd)
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if err != '':
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raise Exception('[*] Error while starting SQL Server'
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', error {0}'.format(err))
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logging.info('[*] SQL Server back to normal')
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def save_environment(home):
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"""Read the environment from the terminal where the scheduler is
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initialized and save the environment variables to be reused within the
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windows service
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"""
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env_path = os.path.join(home, 'env.json')
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with open(env_path, 'wb') as tmp:
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json.dump(os.environ.copy(), tmp)
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def set_environment(home):
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"""Read the environment variables saved by the win_daemon and restore it
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here for the windows service
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"""
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json_env = os.path.join(home, 'env.json')
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with open(json_env, 'rb') as fp:
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env = json.loads(fp.read())
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for k, v in six.iteritems(env):
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os.environ[str(k).strip()] = str(v).strip()
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