mirror of https://github.com/borgbackup/borg.git
719 lines
27 KiB
Python
719 lines
27 KiB
Python
from datetime import datetime, timedelta, timezone
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from getpass import getuser
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from itertools import groupby
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import errno
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import shutil
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import tempfile
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from attic.key import key_factory
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from attic.remote import cache_if_remote
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import msgpack
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import os
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import socket
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import stat
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import sys
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import time
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from io import BytesIO
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from attic import xattr
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from attic.platform import acl_get, acl_set
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from attic.chunker import Chunker
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from attic.hashindex import ChunkIndex
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from attic.helpers import Error, uid2user, user2uid, gid2group, group2gid, \
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Manifest, Statistics, decode_dict, st_mtime_ns, make_path_safe, StableDict, int_to_bigint, bigint_to_int
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ITEMS_BUFFER = 1024 * 1024
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CHUNK_MIN = 1024
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WINDOW_SIZE = 0xfff
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CHUNK_MASK = 0xffff
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utime_supports_fd = os.utime in getattr(os, 'supports_fd', {})
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utime_supports_follow_symlinks = os.utime in getattr(os, 'supports_follow_symlinks', {})
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has_mtime_ns = sys.version >= '3.3'
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has_lchmod = hasattr(os, 'lchmod')
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has_lchflags = hasattr(os, 'lchflags')
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# Python <= 3.2 raises OSError instead of PermissionError (See #164)
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try:
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PermissionError = PermissionError
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except NameError:
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PermissionError = OSError
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class DownloadPipeline:
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def __init__(self, repository, key):
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self.repository = repository
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self.key = key
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def unpack_many(self, ids, filter=None, preload=False):
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unpacker = msgpack.Unpacker(use_list=False)
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for data in self.fetch_many(ids):
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unpacker.feed(data)
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items = [decode_dict(item, (b'path', b'source', b'user', b'group')) for item in unpacker]
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if filter:
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items = [item for item in items if filter(item)]
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if preload:
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for item in items:
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if b'chunks' in item:
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self.repository.preload([c[0] for c in item[b'chunks']])
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for item in items:
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yield item
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def fetch_many(self, ids, is_preloaded=False):
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for id_, data in zip(ids, self.repository.get_many(ids, is_preloaded=is_preloaded)):
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yield self.key.decrypt(id_, data)
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class ChunkBuffer:
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BUFFER_SIZE = 1 * 1024 * 1024
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def __init__(self, key):
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self.buffer = BytesIO()
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self.packer = msgpack.Packer(unicode_errors='surrogateescape')
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self.chunks = []
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self.key = key
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self.chunker = Chunker(WINDOW_SIZE, CHUNK_MASK, CHUNK_MIN, self.key.chunk_seed)
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def add(self, item):
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self.buffer.write(self.packer.pack(StableDict(item)))
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if self.is_full():
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self.flush()
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def write_chunk(self, chunk):
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raise NotImplementedError
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def flush(self, flush=False):
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if self.buffer.tell() == 0:
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return
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self.buffer.seek(0)
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chunks = list(bytes(s) for s in self.chunker.chunkify(self.buffer))
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self.buffer.seek(0)
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self.buffer.truncate(0)
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# Leave the last partial chunk in the buffer unless flush is True
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end = None if flush or len(chunks) == 1 else -1
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for chunk in chunks[:end]:
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self.chunks.append(self.write_chunk(chunk))
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if end == -1:
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self.buffer.write(chunks[-1])
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def is_full(self):
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return self.buffer.tell() > self.BUFFER_SIZE
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class CacheChunkBuffer(ChunkBuffer):
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def __init__(self, cache, key, stats):
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super(CacheChunkBuffer, self).__init__(key)
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self.cache = cache
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self.stats = stats
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def write_chunk(self, chunk):
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id_, _, _ = self.cache.add_chunk(self.key.id_hash(chunk), chunk, self.stats)
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return id_
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class Archive:
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class DoesNotExist(Error):
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"""Archive {} does not exist"""
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class AlreadyExists(Error):
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"""Archive {} already exists"""
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def __init__(self, repository, key, manifest, name, cache=None, create=False,
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checkpoint_interval=300, numeric_owner=False):
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self.cwd = os.getcwd()
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self.key = key
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self.repository = repository
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self.cache = cache
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self.manifest = manifest
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self.hard_links = {}
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self.stats = Statistics()
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self.name = name
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self.checkpoint_interval = checkpoint_interval
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self.numeric_owner = numeric_owner
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self.items_buffer = CacheChunkBuffer(self.cache, self.key, self.stats)
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self.pipeline = DownloadPipeline(self.repository, self.key)
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self.chunker = Chunker(WINDOW_SIZE, CHUNK_MASK, CHUNK_MIN, self.key.chunk_seed)
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if create:
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if name in manifest.archives:
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raise self.AlreadyExists(name)
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self.last_checkpoint = time.time()
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i = 0
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while True:
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self.checkpoint_name = '%s.checkpoint%s' % (name, i and ('.%d' % i) or '')
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if not self.checkpoint_name in manifest.archives:
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break
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i += 1
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else:
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if name not in self.manifest.archives:
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raise self.DoesNotExist(name)
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info = self.manifest.archives[name]
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self.load(info[b'id'])
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def load(self, id):
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self.id = id
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data = self.key.decrypt(self.id, self.repository.get(self.id))
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self.metadata = msgpack.unpackb(data)
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if self.metadata[b'version'] != 1:
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raise Exception('Unknown archive metadata version')
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decode_dict(self.metadata, (b'name', b'hostname', b'username', b'time'))
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self.metadata[b'cmdline'] = [arg.decode('utf-8', 'surrogateescape') for arg in self.metadata[b'cmdline']]
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self.name = self.metadata[b'name']
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@property
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def ts(self):
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"""Timestamp of archive creation in UTC"""
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t, f = self.metadata[b'time'].split('.', 1)
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return datetime.strptime(t, '%Y-%m-%dT%H:%M:%S').replace(tzinfo=timezone.utc) + timedelta(seconds=float('.' + f))
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def __repr__(self):
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return 'Archive(%r)' % self.name
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def iter_items(self, filter=None, preload=False):
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for item in self.pipeline.unpack_many(self.metadata[b'items'], filter=filter, preload=preload):
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yield item
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def add_item(self, item):
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self.items_buffer.add(item)
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if time.time() - self.last_checkpoint > self.checkpoint_interval:
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self.write_checkpoint()
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self.last_checkpoint = time.time()
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def write_checkpoint(self):
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self.save(self.checkpoint_name)
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del self.manifest.archives[self.checkpoint_name]
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self.cache.chunk_decref(self.id, self.stats)
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def save(self, name=None):
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name = name or self.name
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if name in self.manifest.archives:
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raise self.AlreadyExists(name)
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self.items_buffer.flush(flush=True)
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metadata = StableDict({
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'version': 1,
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'name': name,
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'items': self.items_buffer.chunks,
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'cmdline': sys.argv,
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'hostname': socket.gethostname(),
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'username': getuser(),
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'time': datetime.utcnow().isoformat(),
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})
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data = msgpack.packb(metadata, unicode_errors='surrogateescape')
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self.id = self.key.id_hash(data)
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self.cache.add_chunk(self.id, data, self.stats)
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self.manifest.archives[name] = {'id': self.id, 'time': metadata['time']}
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self.manifest.write()
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self.repository.commit()
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self.cache.commit()
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def calc_stats(self, cache):
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def add(id):
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count, size, csize = self.cache.chunks[id]
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stats.update(size, csize, count == 1)
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self.cache.chunks[id] = count - 1, size, csize
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def add_file_chunks(chunks):
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for id, _, _ in chunks:
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add(id)
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# This function is a bit evil since it abuses the cache to calculate
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# the stats. The cache transaction must be rolled back afterwards
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unpacker = msgpack.Unpacker(use_list=False)
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cache.begin_txn()
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stats = Statistics()
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add(self.id)
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for id, chunk in zip(self.metadata[b'items'], self.repository.get_many(self.metadata[b'items'])):
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add(id)
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unpacker.feed(self.key.decrypt(id, chunk))
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for item in unpacker:
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if b'chunks' in item:
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stats.nfiles += 1
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add_file_chunks(item[b'chunks'])
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cache.rollback()
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return stats
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def extract_item(self, item, restore_attrs=True, dry_run=False):
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if dry_run:
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if b'chunks' in item:
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for _ in self.pipeline.fetch_many([c[0] for c in item[b'chunks']], is_preloaded=True):
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pass
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return
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dest = self.cwd
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if item[b'path'].startswith('/') or item[b'path'].startswith('..'):
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raise Exception('Path should be relative and local')
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path = os.path.join(dest, item[b'path'])
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# Attempt to remove existing files, ignore errors on failure
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try:
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st = os.lstat(path)
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if stat.S_ISDIR(st.st_mode):
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os.rmdir(path)
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else:
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os.unlink(path)
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except OSError:
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pass
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mode = item[b'mode']
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if stat.S_ISDIR(mode):
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if not os.path.exists(path):
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os.makedirs(path)
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if restore_attrs:
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self.restore_attrs(path, item)
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elif stat.S_ISREG(mode):
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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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# Hard link?
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if b'source' in item:
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source = os.path.join(dest, item[b'source'])
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if os.path.exists(path):
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os.unlink(path)
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os.link(source, path)
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else:
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with open(path, 'wb') as fd:
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ids = [c[0] for c in item[b'chunks']]
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for data in self.pipeline.fetch_many(ids, is_preloaded=True):
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fd.write(data)
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fd.flush()
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self.restore_attrs(path, item, fd=fd.fileno())
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elif stat.S_ISFIFO(mode):
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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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os.mkfifo(path)
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self.restore_attrs(path, item)
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elif stat.S_ISLNK(mode):
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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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source = item[b'source']
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if os.path.exists(path):
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os.unlink(path)
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os.symlink(source, path)
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self.restore_attrs(path, item, symlink=True)
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elif stat.S_ISCHR(mode) or stat.S_ISBLK(mode):
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os.mknod(path, item[b'mode'], item[b'rdev'])
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self.restore_attrs(path, item)
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else:
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raise Exception('Unknown archive item type %r' % item[b'mode'])
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def restore_attrs(self, path, item, symlink=False, fd=None):
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xattrs = item.get(b'xattrs')
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if xattrs:
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for k, v in xattrs.items():
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try:
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xattr.setxattr(fd or path, k, v, follow_symlinks=False)
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except OSError as e:
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if e.errno != errno.ENOTSUP:
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raise
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uid = gid = None
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if not self.numeric_owner:
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uid = user2uid(item[b'user'])
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gid = group2gid(item[b'group'])
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uid = item[b'uid'] if uid is None else uid
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gid = item[b'gid'] if gid is None else gid
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# This code is a bit of a mess due to os specific differences
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try:
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if fd:
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os.fchown(fd, uid, gid)
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else:
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os.lchown(path, uid, gid)
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except OSError:
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pass
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if fd:
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os.fchmod(fd, item[b'mode'])
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elif not symlink:
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os.chmod(path, item[b'mode'])
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elif has_lchmod: # Not available on Linux
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os.lchmod(path, item[b'mode'])
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mtime = bigint_to_int(item[b'mtime'])
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if fd and utime_supports_fd: # Python >= 3.3
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os.utime(fd, None, ns=(mtime, mtime))
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elif utime_supports_follow_symlinks: # Python >= 3.3
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os.utime(path, None, ns=(mtime, mtime), follow_symlinks=False)
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elif not symlink:
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os.utime(path, (mtime / 1e9, mtime / 1e9))
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acl_set(path, item, self.numeric_owner)
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# Only available on OS X and FreeBSD
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if has_lchflags and b'bsdflags' in item:
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try:
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os.lchflags(path, item[b'bsdflags'])
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except OSError:
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pass
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def delete(self, stats):
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unpacker = msgpack.Unpacker(use_list=False)
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for items_id, data in zip(self.metadata[b'items'], self.repository.get_many(self.metadata[b'items'])):
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unpacker.feed(self.key.decrypt(items_id, data))
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self.cache.chunk_decref(items_id, stats)
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for item in unpacker:
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if b'chunks' in item:
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for chunk_id, size, csize in item[b'chunks']:
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self.cache.chunk_decref(chunk_id, stats)
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self.cache.chunk_decref(self.id, stats)
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del self.manifest.archives[self.name]
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def stat_attrs(self, st, path):
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item = {
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b'mode': st.st_mode,
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b'uid': st.st_uid, b'user': uid2user(st.st_uid),
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b'gid': st.st_gid, b'group': gid2group(st.st_gid),
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b'mtime': int_to_bigint(st_mtime_ns(st))
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}
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if self.numeric_owner:
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item[b'user'] = item[b'group'] = None
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xattrs = xattr.get_all(path, follow_symlinks=False)
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if xattrs:
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item[b'xattrs'] = StableDict(xattrs)
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if has_lchflags and st.st_flags:
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item[b'bsdflags'] = st.st_flags
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acl_get(path, item, st, self.numeric_owner)
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return item
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def process_item(self, path, st):
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item = {b'path': make_path_safe(path)}
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item.update(self.stat_attrs(st, path))
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self.add_item(item)
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def process_dev(self, path, st):
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item = {b'path': make_path_safe(path), b'rdev': st.st_rdev}
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item.update(self.stat_attrs(st, path))
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self.add_item(item)
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def process_symlink(self, path, st):
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source = os.readlink(path)
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item = {b'path': make_path_safe(path), b'source': source}
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item.update(self.stat_attrs(st, path))
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self.add_item(item)
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def process_file(self, path, st, cache):
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safe_path = make_path_safe(path)
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# Is it a hard link?
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if st.st_nlink > 1:
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source = self.hard_links.get((st.st_ino, st.st_dev))
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if (st.st_ino, st.st_dev) in self.hard_links:
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item = self.stat_attrs(st, path)
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item.update({b'path': safe_path, b'source': source})
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self.add_item(item)
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return
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else:
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self.hard_links[st.st_ino, st.st_dev] = safe_path
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path_hash = self.key.id_hash(os.path.join(self.cwd, path).encode('utf-8', 'surrogateescape'))
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ids = cache.file_known_and_unchanged(path_hash, st)
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chunks = None
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if ids is not None:
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# Make sure all ids are available
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for id_ in ids:
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if not cache.seen_chunk(id_):
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break
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else:
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chunks = [cache.chunk_incref(id_, self.stats) for id_ in ids]
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# Only chunkify the file if needed
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if chunks is None:
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with Archive._open_rb(path, st) as fd:
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chunks = []
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for chunk in self.chunker.chunkify(fd):
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chunks.append(cache.add_chunk(self.key.id_hash(chunk), chunk, self.stats))
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cache.memorize_file(path_hash, st, [c[0] for c in chunks])
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item = {b'path': safe_path, b'chunks': chunks}
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item.update(self.stat_attrs(st, path))
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self.stats.nfiles += 1
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self.add_item(item)
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|
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@staticmethod
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def list_archives(repository, key, manifest, cache=None):
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for name, info in manifest.archives.items():
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yield Archive(repository, key, manifest, name, cache=cache)
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@staticmethod
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def _open_rb(path, st):
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flags_noatime = None
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euid = None
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def open_simple(p, s):
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return open(p, 'rb')
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def open_noatime_if_owner(p, s):
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if s.st_uid == euid:
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return os.fdopen(os.open(p, flags_noatime), 'rb')
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else:
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return open(p, 'rb')
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def open_noatime(p, s):
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try:
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fd = os.open(p, flags_noatime)
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except PermissionError:
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# Was this EPERM due to the O_NOATIME flag?
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fo = open(p, 'rb')
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# Yes, it was -- otherwise the above line would have thrown
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# another exception.
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euid = os.geteuid()
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# So in future, let's check whether the file is owned by us
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# before attempting to use O_NOATIME.
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Archive._open_rb = open_noatime_if_owner
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return fo
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return os.fdopen(fd, 'rb')
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o_noatime = getattr(os, 'O_NOATIME', None)
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if o_noatime is not None:
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flags_noatime = os.O_RDONLY | getattr(os, 'O_BINARY', 0) | o_noatime
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# Always use O_NOATIME version.
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Archive._open_rb = open_noatime
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else:
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# Always use non-O_NOATIME version.
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Archive._open_rb = open_simple
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return Archive._open_rb(path, st)
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class RobustUnpacker():
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"""A restartable/robust version of the streaming msgpack unpacker
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"""
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item_keys = [msgpack.packb(name) for name in ('path', 'mode', 'source', 'chunks', 'rdev', 'xattrs', 'user', 'group', 'uid', 'gid', 'mtime')]
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def __init__(self, validator):
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super(RobustUnpacker, self).__init__()
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self.validator = validator
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self._buffered_data = []
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self._resync = False
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self._unpacker = msgpack.Unpacker(object_hook=StableDict)
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def resync(self):
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self._buffered_data = []
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self._resync = True
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def feed(self, data):
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if self._resync:
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self._buffered_data.append(data)
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else:
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self._unpacker.feed(data)
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def __iter__(self):
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return self
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def __next__(self):
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if self._resync:
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data = b''.join(self._buffered_data)
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while self._resync:
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if not data:
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raise StopIteration
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# Abort early if the data does not look like a serialized dict
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if len(data) < 2 or ((data[0] & 0xf0) != 0x80) or ((data[1] & 0xe0) != 0xa0):
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data = data[1:]
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continue
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# Make sure it looks like an item dict
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for pattern in self.item_keys:
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if data[1:].startswith(pattern):
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break
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else:
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data = data[1:]
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continue
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self._unpacker = msgpack.Unpacker(object_hook=StableDict)
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self._unpacker.feed(data)
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try:
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item = next(self._unpacker)
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if self.validator(item):
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self._resync = False
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return item
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# Ignore exceptions that might be raised when feeding
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# msgpack with invalid data
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except (TypeError, ValueError, StopIteration):
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pass
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data = data[1:]
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else:
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return next(self._unpacker)
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class ArchiveChecker:
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def __init__(self):
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self.error_found = False
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self.possibly_superseded = set()
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self.tmpdir = tempfile.mkdtemp()
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def __del__(self):
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shutil.rmtree(self.tmpdir)
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def check(self, repository, repair=False):
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self.report_progress('Starting archive consistency check...')
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self.repair = repair
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self.repository = repository
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self.init_chunks()
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self.key = self.identify_key(repository)
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if not Manifest.MANIFEST_ID in self.chunks:
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self.manifest = self.rebuild_manifest()
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else:
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self.manifest, _ = Manifest.load(repository, key=self.key)
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self.rebuild_refcounts()
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self.verify_chunks()
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if not self.error_found:
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self.report_progress('Archive consistency check complete, no problems found.')
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return self.repair or not self.error_found
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def init_chunks(self):
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"""Fetch a list of all object keys from repository
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"""
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# Explicity set the initial hash table capacity to avoid performance issues
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# due to hash table "resonance"
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capacity = int(len(self.repository) * 1.2)
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self.chunks = ChunkIndex(capacity)
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marker = None
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while True:
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result = self.repository.list(limit=10000, marker=marker)
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if not result:
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break
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marker = result[-1]
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for id_ in result:
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self.chunks[id_] = (0, 0, 0)
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def report_progress(self, msg, error=False):
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if error:
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self.error_found = True
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print(msg, file=sys.stderr if error else sys.stdout)
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def identify_key(self, repository):
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cdata = repository.get(next(self.chunks.iteritems())[0])
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return key_factory(repository, cdata)
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def rebuild_manifest(self):
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"""Rebuild the manifest object if it is missing
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Iterates through all objects in the repository looking for archive metadata blocks.
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"""
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self.report_progress('Rebuilding missing manifest, this might take some time...', error=True)
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manifest = Manifest(self.key, self.repository)
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for chunk_id, _ in self.chunks.iteritems():
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cdata = self.repository.get(chunk_id)
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data = self.key.decrypt(chunk_id, cdata)
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# Some basic sanity checks of the payload before feeding it into msgpack
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if len(data) < 2 or ((data[0] & 0xf0) != 0x80) or ((data[1] & 0xe0) != 0xa0):
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continue
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if not b'cmdline' in data or not b'\xa7version\x01' in data:
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continue
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try:
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archive = msgpack.unpackb(data)
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except:
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continue
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if isinstance(archive, dict) and b'items' in archive and b'cmdline' in archive:
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self.report_progress('Found archive ' + archive[b'name'].decode('utf-8'), error=True)
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manifest.archives[archive[b'name'].decode('utf-8')] = {b'id': chunk_id, b'time': archive[b'time']}
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self.report_progress('Manifest rebuild complete', error=True)
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return manifest
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def rebuild_refcounts(self):
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"""Rebuild object reference counts by walking the metadata
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Missing and/or incorrect data is repaired when detected
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"""
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# Exclude the manifest from chunks
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del self.chunks[Manifest.MANIFEST_ID]
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def mark_as_possibly_superseded(id_):
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if self.chunks.get(id_, (0,))[0] == 0:
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self.possibly_superseded.add(id_)
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def add_callback(chunk):
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id_ = self.key.id_hash(chunk)
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cdata = self.key.encrypt(chunk)
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add_reference(id_, len(chunk), len(cdata), cdata)
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return id_
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def add_reference(id_, size, csize, cdata=None):
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try:
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count, _, _ = self.chunks[id_]
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self.chunks[id_] = count + 1, size, csize
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except KeyError:
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assert cdata is not None
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self.chunks[id_] = 1, size, csize
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if self.repair:
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self.repository.put(id_, cdata)
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def verify_file_chunks(item):
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"""Verifies that all file chunks are present
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Missing file chunks will be replaced with new chunks of the same
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length containing all zeros.
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"""
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offset = 0
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chunk_list = []
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for chunk_id, size, csize in item[b'chunks']:
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if not chunk_id in self.chunks:
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# If a file chunk is missing, create an all empty replacement chunk
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self.report_progress('{}: Missing file chunk detected (Byte {}-{})'.format(item[b'path'].decode('utf-8', 'surrogateescape'), offset, offset + size), error=True)
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data = bytes(size)
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chunk_id = self.key.id_hash(data)
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cdata = self.key.encrypt(data)
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csize = len(cdata)
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add_reference(chunk_id, size, csize, cdata)
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else:
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add_reference(chunk_id, size, csize)
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chunk_list.append((chunk_id, size, csize))
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offset += size
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item[b'chunks'] = chunk_list
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def robust_iterator(archive):
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"""Iterates through all archive items
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Missing item chunks will be skipped and the msgpack stream will be restarted
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"""
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unpacker = RobustUnpacker(lambda item: isinstance(item, dict) and b'path' in item)
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_state = 0
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def missing_chunk_detector(chunk_id):
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nonlocal _state
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if _state % 2 != int(not chunk_id in self.chunks):
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_state += 1
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return _state
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for state, items in groupby(archive[b'items'], missing_chunk_detector):
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items = list(items)
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if state % 2:
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self.report_progress('Archive metadata damage detected', error=True)
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continue
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if state > 0:
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unpacker.resync()
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for chunk_id, cdata in zip(items, repository.get_many(items)):
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unpacker.feed(self.key.decrypt(chunk_id, cdata))
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for item in unpacker:
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yield item
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repository = cache_if_remote(self.repository)
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num_archives = len(self.manifest.archives)
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for i, (name, info) in enumerate(list(self.manifest.archives.items()), 1):
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self.report_progress('Analyzing archive {} ({}/{})'.format(name, i, num_archives))
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archive_id = info[b'id']
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if not archive_id in self.chunks:
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self.report_progress('Archive metadata block is missing', error=True)
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del self.manifest.archives[name]
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continue
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mark_as_possibly_superseded(archive_id)
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cdata = self.repository.get(archive_id)
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data = self.key.decrypt(archive_id, cdata)
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archive = StableDict(msgpack.unpackb(data))
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if archive[b'version'] != 1:
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raise Exception('Unknown archive metadata version')
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decode_dict(archive, (b'name', b'hostname', b'username', b'time')) # fixme: argv
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items_buffer = ChunkBuffer(self.key)
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items_buffer.write_chunk = add_callback
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for item in robust_iterator(archive):
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if b'chunks' in item:
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verify_file_chunks(item)
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items_buffer.add(item)
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items_buffer.flush(flush=True)
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for previous_item_id in archive[b'items']:
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mark_as_possibly_superseded(previous_item_id)
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archive[b'items'] = items_buffer.chunks
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data = msgpack.packb(archive, unicode_errors='surrogateescape')
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new_archive_id = self.key.id_hash(data)
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cdata = self.key.encrypt(data)
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add_reference(new_archive_id, len(data), len(cdata), cdata)
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info[b'id'] = new_archive_id
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def verify_chunks(self):
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unused = set()
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for id_, (count, size, csize) in self.chunks.iteritems():
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if count == 0:
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unused.add(id_)
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orphaned = unused - self.possibly_superseded
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if orphaned:
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self.report_progress('{} orphaned objects found'.format(len(orphaned)), error=True)
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if self.repair:
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for id_ in unused:
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self.repository.delete(id_)
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self.manifest.write()
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self.repository.commit()
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