mirror of https://github.com/borgbackup/borg.git
297 lines
11 KiB
Python
297 lines
11 KiB
Python
import os
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import hashlib
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import logging
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import zlib
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import cPickle
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import argparse
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import sys
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from chunkifier import chunkify
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from cache import Cache, NS_ARCHIVES, NS_CHUNKS
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from bandstore import BandStore
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from helpers import location_validator, pretty_size
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CHUNK_SIZE = 55001
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class LevelFilter(logging.Filter):
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def __init__(self, *args, **kwargs):
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super(LevelFilter, self).__init__(args, **kwargs)
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self.count = {}
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def filter(self, record):
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self.count.setdefault(record.levelname, 0)
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self.count[record.levelname] += 1
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return record
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class Archive(object):
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def __init__(self, store, cache, name=None):
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self.store = store
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self.cache = cache
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self.items = []
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self.chunks = []
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self.chunk_idx = {}
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if name:
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self.open(name)
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def open(self, name):
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id = self.cache.archives[name]
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data = self.store.get(NS_ARCHIVES, id)
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if hashlib.sha256(data).digest() != id:
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raise Exception('Archive hash did not match')
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archive = cPickle.loads(zlib.decompress(data))
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self.items = archive['items']
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self.name = archive['name']
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self.chunks = archive['chunks']
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for i, (id, csize, osize) in enumerate(archive['chunks']):
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self.chunk_idx[i] = id
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def save(self, name):
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archive = {'name': name, 'items': self.items, 'chunks': self.chunks}
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data = zlib.compress(cPickle.dumps(archive))
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self.id = hashlib.sha256(data).digest()
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self.store.put(NS_ARCHIVES, self.id, data)
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self.store.commit()
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def add_chunk(self, id, csize, osize):
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try:
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return self.chunk_idx[id]
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except KeyError:
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idx = len(self.chunks)
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self.chunks.append((id, csize, osize))
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self.chunk_idx[id] = idx
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return idx
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def stats(self, cache):
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total_osize = 0
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total_csize = 0
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total_usize = 0
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chunk_count = {}
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for item in self.items:
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if item['type'] == 'FILE':
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total_osize += item['size']
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for idx in item['chunks']:
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id = self.chunk_idx[idx]
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chunk_count.setdefault(id, 0)
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chunk_count[id] += 1
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for id, c in chunk_count.items():
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count, csize, osize = cache.chunkmap[id]
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total_csize += csize
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if c == count:
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total_usize += csize
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return dict(osize=total_osize, csize=total_csize, usize=total_usize)
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def list(self):
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for item in self.items:
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print item['path']
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def extract(self, dest=None):
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dest = dest or os.getcwdu()
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for item in self.items:
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assert item['path'][0] not in ('/', '\\', ':')
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path = os.path.join(dest, item['path'])
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logging.info(path)
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if item['type'] == 'DIR':
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if not os.path.exists(path):
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os.makedirs(path)
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if item['type'] == 'FILE':
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if not os.path.exists(os.path.dirname(path)):
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os.makedirs(os.path.dirname(path))
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with open(path, 'wb') as fd:
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for chunk in item['chunks']:
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id = self.chunk_idx[chunk]
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data = self.store.get(NS_CHUNKS, id)
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cid = data[:32]
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data = data[32:]
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if hashlib.sha256(data).digest() != cid:
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raise Exception('Invalid chunk checksum')
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if hashlib.sha256(zlib.decompress(data)).digest() != id:
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raise Exception('Invalid chunk checksum')
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fd.write(zlib.decompress(data))
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def verify(self):
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for item in self.items:
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if item['type'] == 'FILE':
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for chunk in item['chunks']:
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id = self.chunk_idx[chunk]
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data = self.store.get(NS_CHUNKS, id)
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data = self.store.get(NS_CHUNKS, id)
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cid = data[:32]
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data = data[32:]
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if (hashlib.sha256(data).digest() != cid or
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hashlib.sha256(zlib.decompress(data)).digest() != id):
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logging.error('%s ... ERROR', item['path'])
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break
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else:
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logging.info('%s ... OK', item['path'])
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def delete(self, cache):
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self.store.delete(NS_ARCHIVES, self.cache.archives[self.name])
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for item in self.items:
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if item['type'] == 'FILE':
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for c in item['chunks']:
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id = self.chunk_idx[c]
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cache.chunk_decref(id)
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self.store.commit()
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del cache.archives[self.name]
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cache.save()
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def create(self, name, paths, cache):
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if name in cache.archives:
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raise NameError('Archive already exists')
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for path in paths:
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for root, dirs, files in os.walk(path):
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for d in dirs:
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p = os.path.join(root, d)
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self.items.append(self.process_dir(p, cache))
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for f in files:
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p = os.path.join(root, f)
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entry = self.process_file(p, cache)
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if entry:
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self.items.append(entry)
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self.save(name)
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cache.archives[name] = self.id
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cache.save()
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def process_dir(self, path, cache):
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path = path.lstrip('/\\:')
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logging.info(path)
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return {'type': 'DIR', 'path': path}
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def process_file(self, path, cache):
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try:
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fd = open(path, 'rb')
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except IOError, e:
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logging.error(e)
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return
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with fd:
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path = path.lstrip('/\\:')
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logging.info(path)
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chunks = []
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size = 0
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for chunk in chunkify(fd, CHUNK_SIZE, 30):
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size += len(chunk)
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chunks.append(self.add_chunk(*cache.add_chunk(chunk)))
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return {'type': 'FILE', 'path': path, 'chunks': chunks, 'size': size}
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class Archiver(object):
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def open_store(self, location):
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store = BandStore(location.path)
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cache = Cache(store)
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return store, cache
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def exit_code_from_logger(self):
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if not self.level_filter.count.get('ERROR'):
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return 0
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else:
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return 1
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def do_create(self, args):
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store, cache = self.open_store(args.archive)
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archive = Archive(store, cache)
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archive.create(args.archive.archive, args.paths, cache)
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return self.exit_code_from_logger()
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def do_extract(self, args):
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store, cache = self.open_store(args.archive)
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archive = Archive(store, cache, args.archive.archive)
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archive.extract(args.dest)
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return self.exit_code_from_logger()
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def do_delete(self, args):
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store, cache = self.open_store(args.archive)
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archive = Archive(store, cache, args.archive.archive)
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archive.delete(cache)
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return self.exit_code_from_logger()
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def do_list(self, args):
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store, cache = self.open_store(args.src)
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if args.src.archive:
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archive = Archive(store, cache, args.src.archive)
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archive.list()
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else:
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for archive in sorted(cache.archives):
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print archive
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return self.exit_code_from_logger()
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def do_verify(self, args):
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store, cache = self.open_store(args.archive)
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archive = Archive(store, cache, args.archive.archive)
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archive.verify()
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return self.exit_code_from_logger()
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def do_info(self, args):
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store, cache = self.open_store(args.archive)
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archive = Archive(store, cache, args.archive.archive)
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stats = archive.stats(cache)
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print 'Original size:', pretty_size(stats['osize'])
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print 'Compressed size:', pretty_size(stats['csize'])
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print 'Unique data:', pretty_size(stats['usize'])
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return self.exit_code_from_logger()
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def run(self, args=None):
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parser = argparse.ArgumentParser(description='Dedupestore')
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parser.add_argument('-v', '--verbose', dest='verbose', action='store_true',
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default=False,
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help='Verbose output')
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subparsers = parser.add_subparsers(title='Available subcommands')
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subparser = subparsers.add_parser('create')
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subparser.set_defaults(func=self.do_create)
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subparser.add_argument('archive', metavar='ARCHIVE',
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type=location_validator(archive=True),
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help='Archive to create')
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subparser.add_argument('paths', metavar='PATH', nargs='+', type=str,
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help='Paths to add to archive')
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subparser = subparsers.add_parser('extract')
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subparser.set_defaults(func=self.do_extract)
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subparser.add_argument('archive', metavar='ARCHIVE',
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type=location_validator(archive=True),
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help='Archive to create')
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subparser.add_argument('dest', metavar='DEST', type=str, nargs='?',
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help='Where to extract files')
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subparser = subparsers.add_parser('delete')
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subparser.set_defaults(func=self.do_delete)
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subparser.add_argument('archive', metavar='ARCHIVE',
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type=location_validator(archive=True),
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help='Archive to delete')
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subparser = subparsers.add_parser('list')
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subparser.set_defaults(func=self.do_list)
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subparser.add_argument('src', metavar='SRC', type=location_validator(),
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help='Store/Archive to list contents of')
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subparser= subparsers.add_parser('verify')
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subparser.set_defaults(func=self.do_verify)
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subparser.add_argument('archive', metavar='ARCHIVE',
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type=location_validator(archive=True),
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help='Archive to verity integrity of')
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subparser= subparsers.add_parser('info')
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subparser.set_defaults(func=self.do_info)
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subparser.add_argument('archive', metavar='ARCHIVE',
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type=location_validator(archive=True),
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help='Archive to display information about')
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args = parser.parse_args(args)
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if args.verbose:
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logging.basicConfig(level=logging.INFO, format='%(message)s')
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else:
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logging.basicConfig(level=logging.WARNING, format='%(message)s')
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self.level_filter = LevelFilter()
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logging.getLogger('').addFilter(self.level_filter)
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return args.func(args)
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def main():
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archiver = Archiver()
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sys.exit(archiver.run())
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if __name__ == '__main__':
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main()
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