fa9d060094
As per IRC conversation, backup should be image so it can mean backup or restore since they will basically be inverses of each other. Change-Id: Ic0d14cc7bfa9071bf45d70b0731e02c106b58277
131 lines
4.2 KiB
Python
Executable File
131 lines
4.2 KiB
Python
Executable File
#!/usr/bin/env python
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# Copyright 2016 Sam Yaple
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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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# Copied and licensed from https://github.com/SamYaple/osdk
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import argparse
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from hashlib import sha1
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import math
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import os
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import sys
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from ekko.manifest import structure as manifest_structure
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from six.moves import range
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from stevedore import driver
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def parse_args():
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parser = argparse.ArgumentParser(description='Backup Block Device')
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parser.add_argument('--backup', required=True,
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help='Path to backup file or device')
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parser.add_argument('--manifest', required=True,
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help='manifest file')
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parser.add_argument('--cbt', required=False,
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help='change block tracking info')
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parser.add_argument('--backend', required=False, default='raw',
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choices=['raw'], help='backend driver')
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parser.add_argument('--storage', required=False, default='local',
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choices=['local'], help='storage driver')
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parser.add_argument('--location', required=True, help='storage path')
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parser.add_argument('--driver', required=False, default='sqlite',
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choices=['osdk', 'sqlite'], help='manifest driver')
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return parser.parse_args()
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def read_segments(segments, metadata, backend):
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size = metadata.segment_size
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reads = [(segment * size, size) for segment in segments[:-1]]
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# NOTE(SamYaple): If are reading the last segment on the disk and the
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# normal read size is greater than the disk, shrink the read size to the
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# appropriate size.
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if segments[-1] * size > metadata.size_of_disk:
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reads.append((segments[-1] * size, metadata.size_of_disk % size))
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else:
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reads.append((segments[-1] * size, size))
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# NOTE(SamYaple): One of the few optimizations we may ever need to do is
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# the dropping of segments that are 100% full of zero bytes. This can
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# potentially greatly reduce the size of a manifest but more importantantly
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# it reduces the number of objects we will need to track
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with open('/dev/zero', 'rb') as f:
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zero_blob = f.read(size)
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for start, data in backend.get_data(reads):
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if data == zero_blob:
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continue
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yield data, manifest_structure.Segment(
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metadata.backupset_id,
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metadata.incremental,
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start / size,
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0,
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0,
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sha1(data).digest()
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)
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def check_manifest(manifest_file):
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return os.path.isfile(manifest_file)
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def main():
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args = parse_args()
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if check_manifest(args.manifest):
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print('manifest exists; exiting')
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return
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manifest = driver.DriverManager(
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namespace='ekko.manifest.drivers',
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name=args.driver,
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invoke_on_load=True,
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invoke_args=[args.manifest]
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).driver
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image = driver.DriverManager(
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namespace='ekko.image.drivers',
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name=args.backend,
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invoke_on_load=True,
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invoke_args=[args.backup]
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).driver
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storage = driver.DriverManager(
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namespace='ekko.storage.drivers',
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name=args.storage,
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invoke_on_load=True,
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invoke_args=[args.location]
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).driver
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size_of_disk = image.get_size()
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incremental = 0
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metadata = manifest_structure.Metadata(incremental, size_of_disk)
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manifest.initialize()
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manifest.put_metadata(metadata)
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segments_list = list(range(0, int(math.ceil(
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float(size_of_disk)/metadata.segment_size))))
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data_segments = read_segments(segments_list, metadata, image)
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segments = [
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storage.put_data(data_segment) for data_segment in data_segments
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]
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manifest.put_segments(segments, metadata)
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if __name__ == '__main__':
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sys.exit(main())
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