mirror of
https://github.com/borgbackup/borg.git
synced 2025-02-24 07:01:59 +00:00
1163 lines
48 KiB
Python
1163 lines
48 KiB
Python
from contextlib import contextmanager
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from datetime import datetime, timezone, timedelta
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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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from .logger import create_logger
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logger = create_logger()
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from .key import key_factory
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from .remote import cache_if_remote
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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 . import xattr
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from .helpers import Error, uid2user, user2uid, gid2group, group2gid, bin_to_hex, \
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parse_timestamp, to_localtime, format_time, format_timedelta, remove_surrogates, \
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Manifest, Statistics, decode_dict, make_path_safe, StableDict, int_to_bigint, bigint_to_int, \
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ProgressIndicatorPercent, IntegrityError
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from .platform import acl_get, acl_set
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from .chunker import Chunker
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from .hashindex import ChunkIndex
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from .repository import Repository
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import msgpack
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ITEMS_BUFFER = 1024 * 1024
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CHUNK_MIN_EXP = 19 # 2**19 == 512kiB
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CHUNK_MAX_EXP = 23 # 2**23 == 8MiB
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HASH_WINDOW_SIZE = 0xfff # 4095B
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HASH_MASK_BITS = 21 # results in ~2MiB chunks statistically
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# defaults, use --chunker-params to override
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CHUNKER_PARAMS = (CHUNK_MIN_EXP, CHUNK_MAX_EXP, HASH_MASK_BITS, HASH_WINDOW_SIZE)
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# chunker params for the items metadata stream, finer granularity
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ITEMS_CHUNKER_PARAMS = (15, 19, 17, HASH_WINDOW_SIZE)
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has_lchmod = hasattr(os, 'lchmod')
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has_lchflags = hasattr(os, 'lchflags')
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flags_normal = os.O_RDONLY | getattr(os, 'O_BINARY', 0)
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flags_noatime = flags_normal | getattr(os, 'O_NOATIME', 0)
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def is_special(mode):
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# file types that get special treatment in --read-special mode
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return stat.S_ISBLK(mode) or stat.S_ISCHR(mode) or stat.S_ISFIFO(mode)
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class BackupOSError(Exception):
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"""
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Wrapper for OSError raised while accessing backup files.
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Borg does different kinds of IO, and IO failures have different consequences.
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This wrapper represents failures of input file or extraction IO.
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These are non-critical and are only reported (exit code = 1, warning).
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Any unwrapped IO error is critical and aborts execution (for example repository IO failure).
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"""
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def __init__(self, os_error):
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self.os_error = os_error
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self.errno = os_error.errno
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self.strerror = os_error.strerror
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self.filename = os_error.filename
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def __str__(self):
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return str(self.os_error)
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@contextmanager
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def backup_io():
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"""Context manager changing OSError to BackupOSError."""
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try:
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yield
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except OSError as os_error:
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raise BackupOSError(os_error) from os_error
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def backup_io_iter(iterator):
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while True:
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try:
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with backup_io():
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item = next(iterator)
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except StopIteration:
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return
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yield item
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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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"""
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Return iterator of items.
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*ids* is a chunk ID list of an item stream. *filter* is a callable
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to decide whether an item will be yielded. *preload* preloads the data chunks of every yielded item.
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Warning: if *preload* is True then all data chunks of every yielded item have to be retrieved,
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otherwise preloaded chunks will accumulate in RemoteRepository and create a memory leak.
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"""
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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, chunker_params=ITEMS_CHUNKER_PARAMS):
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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(self.key.chunk_seed, *chunker_params)
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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, chunker_params=ITEMS_CHUNKER_PARAMS):
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super().__init__(key, chunker_params)
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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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class IncompatibleFilesystemEncodingError(Error):
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"""Failed to encode filename "{}" into file system encoding "{}". Consider configuring the LANG environment variable."""
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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, noatime=False, noctime=False, progress=False,
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chunker_params=CHUNKER_PARAMS, start=None, start_monotonic=None, end=None):
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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.show_progress = progress
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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.noatime = noatime
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self.noctime = noctime
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assert (start is None) == (start_monotonic is None), 'Logic error: if start is given, start_monotonic must be given as well and vice versa.'
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if start is None:
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start = datetime.utcnow()
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start_monotonic = time.monotonic()
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self.start = start
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self.start_monotonic = start_monotonic
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if end is None:
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end = datetime.utcnow()
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self.end = end
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self.pipeline = DownloadPipeline(self.repository, self.key)
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if create:
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self.items_buffer = CacheChunkBuffer(self.cache, self.key, self.stats)
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self.chunker = Chunker(self.key.chunk_seed, *chunker_params)
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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.monotonic()
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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 self.checkpoint_name not 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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self.zeros = b'\0' * (1 << chunker_params[1])
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def _load_meta(self, id):
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data = self.key.decrypt(id, self.repository.get(id))
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metadata = msgpack.unpackb(data, unicode_errors='surrogateescape')
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if metadata[b'version'] != 1:
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raise Exception('Unknown archive metadata version')
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return metadata
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def load(self, id):
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self.id = id
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self.metadata = self._load_meta(self.id)
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decode_dict(self.metadata, (b'name', b'hostname', b'username', b'time', b'time_end'))
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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 (start) in UTC"""
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ts = self.metadata[b'time']
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return parse_timestamp(ts)
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@property
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def ts_end(self):
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"""Timestamp of archive creation (end) in UTC"""
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# fall back to time if there is no time_end present in metadata
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ts = self.metadata.get(b'time_end') or self.metadata[b'time']
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return parse_timestamp(ts)
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@property
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def fpr(self):
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return bin_to_hex(self.id)
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@property
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def duration(self):
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return format_timedelta(self.end - self.start)
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def __str__(self):
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return '''\
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Archive name: {0.name}
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Archive fingerprint: {0.fpr}
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Time (start): {start}
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Time (end): {end}
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Duration: {0.duration}
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Number of files: {0.stats.nfiles}'''.format(
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self,
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start=format_time(to_localtime(self.start.replace(tzinfo=timezone.utc))),
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end=format_time(to_localtime(self.end.replace(tzinfo=timezone.utc))))
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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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unknown_keys = set(item) - self.manifest.item_keys
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assert not unknown_keys, ('unknown item metadata keys detected, please update ITEM_KEYS: %s',
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','.join(k.decode('ascii') for k in unknown_keys))
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if self.show_progress:
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self.stats.show_progress(item=item, dt=0.2)
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self.items_buffer.add(item)
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if time.monotonic() - self.last_checkpoint > self.checkpoint_interval:
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self.write_checkpoint()
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self.last_checkpoint = time.monotonic()
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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, timestamp=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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duration = timedelta(seconds=time.monotonic() - self.start_monotonic)
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if timestamp is None:
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self.end = datetime.utcnow()
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self.start = self.end - duration
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start = self.start
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end = self.end
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else:
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self.end = timestamp
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self.start = timestamp - duration
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end = timestamp
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start = self.start
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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': start.isoformat(),
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'time_end': end.isoformat(),
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})
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data = self.key.pack_and_authenticate_metadata(metadata, context=b'archive')
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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 = cache.chunks[id]
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stats.update(size, csize, count == 1)
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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, stdout=False, sparse=False):
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has_damaged_chunks = b'chunks_healthy' in item
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if dry_run or stdout:
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if b'chunks' in item:
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for data in self.pipeline.fetch_many([c[0] for c in item[b'chunks']], is_preloaded=True):
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if stdout:
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sys.stdout.buffer.write(data)
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if stdout:
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sys.stdout.buffer.flush()
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if has_damaged_chunks:
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logger.warning('File %s has damaged (all-zero) chunks. Try running borg check --repair.' %
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remove_surrogates(item[b'path']))
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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 UnicodeEncodeError:
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raise self.IncompatibleFilesystemEncodingError(path, sys.getfilesystemencoding()) from None
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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_ISREG(mode):
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if not os.path.exists(os.path.dirname(path)):
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with backup_io():
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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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with backup_io():
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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 backup_io():
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fd = open(path, 'wb')
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with 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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with backup_io():
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if sparse and self.zeros.startswith(data):
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# all-zero chunk: create a hole in a sparse file
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fd.seek(len(data), 1)
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else:
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fd.write(data)
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with backup_io():
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pos = fd.tell()
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fd.truncate(pos)
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fd.flush()
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self.restore_attrs(path, item, fd=fd.fileno())
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if has_damaged_chunks:
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logger.warning('File %s has damaged (all-zero) chunks. Try running borg check --repair.' %
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remove_surrogates(item[b'path']))
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return
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with backup_io():
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# No repository access beyond this point.
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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_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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try:
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os.symlink(source, path)
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except UnicodeEncodeError:
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raise self.IncompatibleFilesystemEncodingError(source, sys.getfilesystemencoding()) from None
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self.restore_attrs(path, item, symlink=True)
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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_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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"""
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Restore filesystem attributes on *path* (*fd*) from *item*.
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Does not access the repository.
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"""
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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'])
|
|
if b'atime' in item:
|
|
atime = bigint_to_int(item[b'atime'])
|
|
else:
|
|
# old archives only had mtime in item metadata
|
|
atime = mtime
|
|
if fd:
|
|
os.utime(fd, None, ns=(atime, mtime))
|
|
else:
|
|
os.utime(path, None, ns=(atime, mtime), follow_symlinks=False)
|
|
acl_set(path, item, self.numeric_owner)
|
|
# Only available on OS X and FreeBSD
|
|
if has_lchflags and b'bsdflags' in item:
|
|
try:
|
|
os.lchflags(path, item[b'bsdflags'])
|
|
except OSError:
|
|
pass
|
|
# chown removes Linux capabilities, so set the extended attributes at the end, after chown, since they include
|
|
# the Linux capabilities in the "security.capability" attribute.
|
|
xattrs = item.get(b'xattrs', {})
|
|
for k, v in xattrs.items():
|
|
try:
|
|
xattr.setxattr(fd or path, k, v, follow_symlinks=False)
|
|
except OSError as e:
|
|
if e.errno not in (errno.ENOTSUP, errno.EACCES):
|
|
# only raise if the errno is not on our ignore list:
|
|
# ENOTSUP == xattrs not supported here
|
|
# EACCES == permission denied to set this specific xattr
|
|
# (this may happen related to security.* keys)
|
|
raise
|
|
|
|
def rename(self, name):
|
|
if name in self.manifest.archives:
|
|
raise self.AlreadyExists(name)
|
|
metadata = StableDict(self._load_meta(self.id))
|
|
metadata[b'name'] = name
|
|
data = msgpack.packb(metadata, unicode_errors='surrogateescape')
|
|
new_id = self.key.id_hash(data)
|
|
self.cache.add_chunk(new_id, data, self.stats)
|
|
self.manifest.archives[name] = {'id': new_id, 'time': metadata[b'time']}
|
|
self.cache.chunk_decref(self.id, self.stats)
|
|
del self.manifest.archives[self.name]
|
|
|
|
def delete(self, stats, progress=False, forced=False):
|
|
class ChunksIndexError(Error):
|
|
"""Chunk ID {} missing from chunks index, corrupted chunks index - aborting transaction."""
|
|
|
|
def chunk_decref(id, stats):
|
|
nonlocal error
|
|
try:
|
|
self.cache.chunk_decref(id, stats)
|
|
except KeyError:
|
|
cid = bin_to_hex(id)
|
|
raise ChunksIndexError(cid)
|
|
except Repository.ObjectNotFound as e:
|
|
# object not in repo - strange, but we wanted to delete it anyway.
|
|
if not forced:
|
|
raise
|
|
error = True
|
|
|
|
error = False
|
|
try:
|
|
unpacker = msgpack.Unpacker(use_list=False)
|
|
items_ids = self.metadata[b'items']
|
|
pi = ProgressIndicatorPercent(total=len(items_ids), msg="Decrementing references %3.0f%%", same_line=True)
|
|
for (i, (items_id, data)) in enumerate(zip(items_ids, self.repository.get_many(items_ids))):
|
|
if progress:
|
|
pi.show(i)
|
|
unpacker.feed(self.key.decrypt(items_id, data))
|
|
chunk_decref(items_id, stats)
|
|
try:
|
|
for item in unpacker:
|
|
if b'chunks' in item:
|
|
for chunk_id, size, csize in item[b'chunks']:
|
|
chunk_decref(chunk_id, stats)
|
|
except (TypeError, ValueError):
|
|
# if items metadata spans multiple chunks and one chunk got dropped somehow,
|
|
# it could be that unpacker yields bad types
|
|
if not forced:
|
|
raise
|
|
error = True
|
|
if progress:
|
|
pi.finish()
|
|
except (msgpack.UnpackException, Repository.ObjectNotFound):
|
|
# items metadata corrupted
|
|
if not forced:
|
|
raise
|
|
error = True
|
|
# in forced delete mode, we try hard to delete at least the manifest entry,
|
|
# if possible also the archive superblock, even if processing the items raises
|
|
# some harmless exception.
|
|
chunk_decref(self.id, stats)
|
|
del self.manifest.archives[self.name]
|
|
if error:
|
|
logger.warning('forced deletion succeeded, but the deleted archive was corrupted.')
|
|
logger.warning('borg check --repair is required to free all space.')
|
|
|
|
def stat_attrs(self, st, path):
|
|
item = {
|
|
b'mode': st.st_mode,
|
|
b'uid': st.st_uid, b'user': uid2user(st.st_uid),
|
|
b'gid': st.st_gid, b'group': gid2group(st.st_gid),
|
|
b'mtime': int_to_bigint(st.st_mtime_ns),
|
|
}
|
|
# borg can work with archives only having mtime (older attic archives do not have
|
|
# atime/ctime). it can be useful to omit atime/ctime, if they change without the
|
|
# file content changing - e.g. to get better metadata deduplication.
|
|
if not self.noatime:
|
|
item[b'atime'] = int_to_bigint(st.st_atime_ns)
|
|
if not self.noctime:
|
|
item[b'ctime'] = int_to_bigint(st.st_ctime_ns)
|
|
if self.numeric_owner:
|
|
item[b'user'] = item[b'group'] = None
|
|
with backup_io():
|
|
xattrs = xattr.get_all(path, follow_symlinks=False)
|
|
if xattrs:
|
|
item[b'xattrs'] = StableDict(xattrs)
|
|
if has_lchflags and st.st_flags:
|
|
item[b'bsdflags'] = st.st_flags
|
|
with backup_io():
|
|
acl_get(path, item, st, self.numeric_owner)
|
|
return item
|
|
|
|
def process_dir(self, path, st):
|
|
item = {b'path': make_path_safe(path)}
|
|
item.update(self.stat_attrs(st, path))
|
|
self.add_item(item)
|
|
return 'd' # directory
|
|
|
|
def process_fifo(self, path, st):
|
|
item = {b'path': make_path_safe(path)}
|
|
item.update(self.stat_attrs(st, path))
|
|
self.add_item(item)
|
|
return 'f' # fifo
|
|
|
|
def process_dev(self, path, st):
|
|
item = {b'path': make_path_safe(path), b'rdev': st.st_rdev}
|
|
item.update(self.stat_attrs(st, path))
|
|
self.add_item(item)
|
|
if stat.S_ISCHR(st.st_mode):
|
|
return 'c' # char device
|
|
elif stat.S_ISBLK(st.st_mode):
|
|
return 'b' # block device
|
|
|
|
def process_symlink(self, path, st):
|
|
with backup_io():
|
|
source = os.readlink(path)
|
|
item = {b'path': make_path_safe(path), b'source': source}
|
|
item.update(self.stat_attrs(st, path))
|
|
self.add_item(item)
|
|
return 's' # symlink
|
|
|
|
def process_stdin(self, path, cache):
|
|
uid, gid = 0, 0
|
|
fd = sys.stdin.buffer # binary
|
|
chunks = []
|
|
for chunk in backup_io_iter(self.chunker.chunkify(fd)):
|
|
chunks.append(cache.add_chunk(self.key.id_hash(chunk), chunk, self.stats))
|
|
self.stats.nfiles += 1
|
|
t = int_to_bigint(int(time.time()) * 1000000000)
|
|
item = {
|
|
b'path': path,
|
|
b'chunks': chunks,
|
|
b'mode': 0o100660, # regular file, ug=rw
|
|
b'uid': uid, b'user': uid2user(uid),
|
|
b'gid': gid, b'group': gid2group(gid),
|
|
b'mtime': t, b'atime': t, b'ctime': t,
|
|
}
|
|
self.add_item(item)
|
|
return 'i' # stdin
|
|
|
|
def process_file(self, path, st, cache, ignore_inode=False):
|
|
status = None
|
|
safe_path = make_path_safe(path)
|
|
# Is it a hard link?
|
|
if st.st_nlink > 1:
|
|
source = self.hard_links.get((st.st_ino, st.st_dev))
|
|
if source is not None:
|
|
item = self.stat_attrs(st, path)
|
|
item.update({b'path': safe_path, b'source': source})
|
|
self.add_item(item)
|
|
status = 'h' # regular file, hardlink (to already seen inodes)
|
|
return status
|
|
else:
|
|
self.hard_links[st.st_ino, st.st_dev] = safe_path
|
|
is_special_file = is_special(st.st_mode)
|
|
if not is_special_file:
|
|
path_hash = self.key.id_hash(os.path.join(self.cwd, path).encode('utf-8', 'surrogateescape'))
|
|
ids = cache.file_known_and_unchanged(path_hash, st, ignore_inode)
|
|
else:
|
|
# in --read-special mode, we may be called for special files.
|
|
# there should be no information in the cache about special files processed in
|
|
# read-special mode, but we better play safe as this was wrong in the past:
|
|
path_hash = ids = None
|
|
first_run = not cache.files
|
|
if first_run:
|
|
logger.debug('Processing files ...')
|
|
chunks = None
|
|
if ids is not None:
|
|
# Make sure all ids are available
|
|
for id_ in ids:
|
|
if not cache.seen_chunk(id_):
|
|
break
|
|
else:
|
|
chunks = [cache.chunk_incref(id_, self.stats) for id_ in ids]
|
|
status = 'U' # regular file, unchanged
|
|
else:
|
|
status = 'A' # regular file, added
|
|
item = {b'path': safe_path}
|
|
# Only chunkify the file if needed
|
|
if chunks is None:
|
|
with backup_io():
|
|
fh = Archive._open_rb(path)
|
|
with os.fdopen(fh, 'rb') as fd:
|
|
chunks = []
|
|
for chunk in backup_io_iter(self.chunker.chunkify(fd, fh)):
|
|
chunks.append(cache.add_chunk(self.key.id_hash(chunk), chunk, self.stats))
|
|
if self.show_progress:
|
|
self.stats.show_progress(item=item, dt=0.2)
|
|
if not is_special_file:
|
|
# we must not memorize special files, because the contents of e.g. a
|
|
# block or char device will change without its mtime/size/inode changing.
|
|
cache.memorize_file(path_hash, st, [c[0] for c in chunks])
|
|
status = status or 'M' # regular file, modified (if not 'A' already)
|
|
item[b'chunks'] = chunks
|
|
item.update(self.stat_attrs(st, path))
|
|
if is_special_file:
|
|
# we processed a special file like a regular file. reflect that in mode,
|
|
# so it can be extracted / accessed in FUSE mount like a regular file:
|
|
item[b'mode'] = stat.S_IFREG | stat.S_IMODE(item[b'mode'])
|
|
self.stats.nfiles += 1
|
|
self.add_item(item)
|
|
return status
|
|
|
|
@staticmethod
|
|
def list_archives(repository, key, manifest, cache=None):
|
|
# expensive! see also Manifest.list_archive_infos.
|
|
for name, info in manifest.archives.items():
|
|
yield Archive(repository, key, manifest, name, cache=cache)
|
|
|
|
@staticmethod
|
|
def _open_rb(path):
|
|
try:
|
|
# if we have O_NOATIME, this likely will succeed if we are root or owner of file:
|
|
return os.open(path, flags_noatime)
|
|
except PermissionError:
|
|
if flags_noatime == flags_normal:
|
|
# we do not have O_NOATIME, no need to try again:
|
|
raise
|
|
# Was this EPERM due to the O_NOATIME flag? Try again without it:
|
|
return os.open(path, flags_normal)
|
|
|
|
|
|
# this set must be kept complete, otherwise the RobustUnpacker might malfunction:
|
|
ITEM_KEYS = frozenset([b'path', b'source', b'rdev', b'chunks', b'chunks_healthy',
|
|
b'mode', b'user', b'group', b'uid', b'gid', b'mtime', b'atime', b'ctime',
|
|
b'xattrs', b'bsdflags', b'acl_nfs4', b'acl_access', b'acl_default', b'acl_extended', ])
|
|
|
|
# this is the set of keys that are always present in items:
|
|
REQUIRED_ITEM_KEYS = frozenset([b'path', b'mtime', ])
|
|
|
|
# this set must be kept complete, otherwise rebuild_manifest might malfunction:
|
|
ARCHIVE_KEYS = frozenset([b'version', b'name', b'items', b'cmdline', b'hostname', b'username', b'time', b'time_end', ])
|
|
|
|
# this is the set of keys that are always present in archives:
|
|
REQUIRED_ARCHIVE_KEYS = frozenset([b'version', b'name', b'items', b'cmdline', b'time', ])
|
|
|
|
|
|
def valid_msgpacked_dict(d, keys_serialized):
|
|
"""check if the data <d> looks like a msgpacked dict"""
|
|
d_len = len(d)
|
|
if d_len == 0:
|
|
return False
|
|
if d[0] & 0xf0 == 0x80: # object is a fixmap (up to 15 elements)
|
|
offs = 1
|
|
elif d[0] == 0xde: # object is a map16 (up to 2^16-1 elements)
|
|
offs = 3
|
|
else:
|
|
# object is not a map (dict)
|
|
# note: we must not have dicts with > 2^16-1 elements
|
|
return False
|
|
if d_len <= offs:
|
|
return False
|
|
# is the first dict key a bytestring?
|
|
if d[offs] & 0xe0 == 0xa0: # key is a small bytestring (up to 31 chars)
|
|
pass
|
|
elif d[offs] in (0xd9, 0xda, 0xdb): # key is a str8, str16 or str32
|
|
pass
|
|
else:
|
|
# key is not a bytestring
|
|
return False
|
|
# is the bytestring any of the expected key names?
|
|
key_serialized = d[offs:]
|
|
return any(key_serialized.startswith(pattern) for pattern in keys_serialized)
|
|
|
|
|
|
class RobustUnpacker:
|
|
"""A restartable/robust version of the streaming msgpack unpacker
|
|
"""
|
|
class UnpackerCrashed(Exception):
|
|
"""raise if unpacker crashed"""
|
|
|
|
def __init__(self, validator, item_keys):
|
|
super().__init__()
|
|
self.item_keys = [msgpack.packb(name) for name in item_keys]
|
|
self.validator = validator
|
|
self._buffered_data = []
|
|
self._resync = False
|
|
self._unpacker = msgpack.Unpacker(object_hook=StableDict)
|
|
|
|
def resync(self):
|
|
self._buffered_data = []
|
|
self._resync = True
|
|
|
|
def feed(self, data):
|
|
if self._resync:
|
|
self._buffered_data.append(data)
|
|
else:
|
|
self._unpacker.feed(data)
|
|
|
|
def __iter__(self):
|
|
return self
|
|
|
|
def __next__(self):
|
|
def unpack_next():
|
|
try:
|
|
return next(self._unpacker)
|
|
except (TypeError, ValueError) as err:
|
|
# transform exceptions that might be raised when feeding
|
|
# msgpack with invalid data to a more specific exception
|
|
raise self.UnpackerCrashed(str(err))
|
|
|
|
if self._resync:
|
|
data = b''.join(self._buffered_data)
|
|
while self._resync:
|
|
if not data:
|
|
raise StopIteration
|
|
# Abort early if the data does not look like a serialized item dict
|
|
if not valid_msgpacked_dict(data, self.item_keys):
|
|
data = data[1:]
|
|
continue
|
|
self._unpacker = msgpack.Unpacker(object_hook=StableDict)
|
|
self._unpacker.feed(data)
|
|
try:
|
|
item = unpack_next()
|
|
except (self.UnpackerCrashed, StopIteration):
|
|
# as long as we are resyncing, we also ignore StopIteration
|
|
pass
|
|
else:
|
|
if self.validator(item):
|
|
self._resync = False
|
|
return item
|
|
data = data[1:]
|
|
else:
|
|
return unpack_next()
|
|
|
|
|
|
class ArchiveChecker:
|
|
|
|
def __init__(self):
|
|
self.error_found = False
|
|
self.possibly_superseded = set()
|
|
|
|
def check(self, repository, repair=False, archive=None, last=None, prefix=None, save_space=False):
|
|
logger.info('Starting archive consistency check...')
|
|
self.check_all = archive is None and last is None and prefix is None
|
|
self.repair = repair
|
|
self.repository = repository
|
|
self.init_chunks()
|
|
if not self.chunks:
|
|
logger.error('Repository contains no apparent data at all, cannot continue check/repair.')
|
|
return False
|
|
self.key = self.identify_key(repository)
|
|
if Manifest.MANIFEST_ID not in self.chunks:
|
|
logger.error("Repository manifest not found!")
|
|
self.error_found = True
|
|
self.manifest = self.rebuild_manifest()
|
|
else:
|
|
try:
|
|
self.manifest, _ = Manifest.load(repository, key=self.key)
|
|
except IntegrityError as exc:
|
|
logger.error('Repository manifest is corrupted: %s', exc)
|
|
self.error_found = True
|
|
del self.chunks[Manifest.MANIFEST_ID]
|
|
self.manifest = self.rebuild_manifest()
|
|
self.rebuild_refcounts(archive=archive, last=last, prefix=prefix)
|
|
self.orphan_chunks_check()
|
|
self.finish(save_space=save_space)
|
|
if self.error_found:
|
|
logger.error('Archive consistency check complete, problems found.')
|
|
else:
|
|
logger.info('Archive consistency check complete, no problems found.')
|
|
return self.repair or not self.error_found
|
|
|
|
def init_chunks(self):
|
|
"""Fetch a list of all object keys from repository
|
|
"""
|
|
# Explicitly set the initial hash table capacity to avoid performance issues
|
|
# due to hash table "resonance".
|
|
# Since reconstruction of archive items can add some new chunks, add 10 % headroom
|
|
capacity = int(len(self.repository) / ChunkIndex.MAX_LOAD_FACTOR * 1.1)
|
|
self.chunks = ChunkIndex(capacity)
|
|
marker = None
|
|
while True:
|
|
result = self.repository.list(limit=10000, marker=marker)
|
|
if not result:
|
|
break
|
|
marker = result[-1]
|
|
for id_ in result:
|
|
self.chunks[id_] = (0, 0, 0)
|
|
|
|
def identify_key(self, repository):
|
|
try:
|
|
some_chunkid, _ = next(self.chunks.iteritems())
|
|
except StopIteration:
|
|
# repo is completely empty, no chunks
|
|
return None
|
|
cdata = repository.get(some_chunkid)
|
|
return key_factory(repository, cdata)
|
|
|
|
def rebuild_manifest(self):
|
|
"""Rebuild the manifest object if it is missing
|
|
|
|
Iterates through all objects in the repository looking for archive metadata blocks.
|
|
"""
|
|
def valid_archive(obj):
|
|
if not isinstance(obj, dict):
|
|
return False
|
|
keys = set(obj)
|
|
return REQUIRED_ARCHIVE_KEYS.issubset(keys)
|
|
|
|
logger.info('Rebuilding missing manifest, this might take some time...')
|
|
# as we have lost the manifest, we do not know any more what valid item keys we had.
|
|
# collecting any key we encounter in a damaged repo seems unwise, thus we just use
|
|
# the hardcoded list from the source code. thus, it is not recommended to rebuild a
|
|
# lost manifest on a older borg version than the most recent one that was ever used
|
|
# within this repository (assuming that newer borg versions support more item keys).
|
|
manifest = Manifest(self.key, self.repository)
|
|
archive_keys_serialized = [msgpack.packb(name) for name in ARCHIVE_KEYS]
|
|
for chunk_id, _ in self.chunks.iteritems():
|
|
cdata = self.repository.get(chunk_id)
|
|
try:
|
|
data = self.key.decrypt(chunk_id, cdata)
|
|
except IntegrityError as exc:
|
|
logger.error('Skipping corrupted chunk: %s', exc)
|
|
self.error_found = True
|
|
continue
|
|
if not valid_msgpacked_dict(data, archive_keys_serialized):
|
|
continue
|
|
if b'cmdline' not in data or b'\xa7version\x01' not in data:
|
|
continue
|
|
try:
|
|
archive = msgpack.unpackb(data)
|
|
# Ignore exceptions that might be raised when feeding
|
|
# msgpack with invalid data
|
|
except (TypeError, ValueError, StopIteration):
|
|
continue
|
|
if valid_archive(archive):
|
|
name = archive[b'name'].decode()
|
|
logger.info('Found archive %s', name)
|
|
if name in manifest.archives:
|
|
i = 1
|
|
while True:
|
|
new_name = '%s.%d' % (name, i)
|
|
if new_name not in manifest.archives:
|
|
break
|
|
i += 1
|
|
logger.warning('Duplicate archive name %s, storing as %s', name, new_name)
|
|
name = new_name
|
|
manifest.archives[name] = {b'id': chunk_id, b'time': archive[b'time']}
|
|
logger.info('Manifest rebuild complete.')
|
|
return manifest
|
|
|
|
def rebuild_refcounts(self, archive=None, last=None, prefix=None):
|
|
"""Rebuild object reference counts by walking the metadata
|
|
|
|
Missing and/or incorrect data is repaired when detected
|
|
"""
|
|
# Exclude the manifest from chunks
|
|
del self.chunks[Manifest.MANIFEST_ID]
|
|
|
|
def mark_as_possibly_superseded(id_):
|
|
if self.chunks.get(id_, (0,))[0] == 0:
|
|
self.possibly_superseded.add(id_)
|
|
|
|
def add_callback(chunk):
|
|
id_ = self.key.id_hash(chunk)
|
|
cdata = self.key.encrypt(chunk)
|
|
add_reference(id_, len(chunk), len(cdata), cdata)
|
|
return id_
|
|
|
|
def add_reference(id_, size, csize, cdata=None):
|
|
try:
|
|
self.chunks.incref(id_)
|
|
except KeyError:
|
|
assert cdata is not None
|
|
self.chunks[id_] = 1, size, csize
|
|
if self.repair:
|
|
self.repository.put(id_, cdata)
|
|
|
|
def verify_file_chunks(item):
|
|
"""Verifies that all file chunks are present.
|
|
|
|
Missing file chunks will be replaced with new chunks of the same length containing all zeros.
|
|
If a previously missing file chunk re-appears, the replacement chunk is replaced by the correct one.
|
|
"""
|
|
offset = 0
|
|
chunk_list = []
|
|
chunks_replaced = False
|
|
has_chunks_healthy = b'chunks_healthy' in item
|
|
chunks_current = item[b'chunks']
|
|
chunks_healthy = item[b'chunks_healthy'] if has_chunks_healthy else chunks_current
|
|
assert len(chunks_current) == len(chunks_healthy)
|
|
for chunk_current, chunk_healthy in zip(chunks_current, chunks_healthy):
|
|
chunk_id, size, csize = chunk_healthy
|
|
if chunk_id not in self.chunks:
|
|
# a chunk of the healthy list is missing
|
|
if chunk_current == chunk_healthy:
|
|
logger.error('{}: New missing file chunk detected (Byte {}-{}). '
|
|
'Replacing with all-zero chunk.'.format(
|
|
item[b'path'].decode('utf-8', 'surrogateescape'), offset, offset + size))
|
|
self.error_found = chunks_replaced = True
|
|
data = bytes(size)
|
|
chunk_id = self.key.id_hash(data)
|
|
cdata = self.key.encrypt(data)
|
|
csize = len(cdata)
|
|
add_reference(chunk_id, size, csize, cdata)
|
|
else:
|
|
logger.info('{}: Previously missing file chunk is still missing (Byte {}-{}). '
|
|
'It has a all-zero replacement chunk already.'.format(
|
|
item[b'path'].decode('utf-8', 'surrogateescape'), offset, offset + size))
|
|
chunk_id, size, csize = chunk_current
|
|
add_reference(chunk_id, size, csize)
|
|
else:
|
|
if chunk_current == chunk_healthy:
|
|
# normal case, all fine.
|
|
add_reference(chunk_id, size, csize)
|
|
else:
|
|
logger.info('{}: Healed previously missing file chunk! (Byte {}-{}).'.format(
|
|
item[b'path'].decode('utf-8', 'surrogateescape'), offset, offset + size))
|
|
add_reference(chunk_id, size, csize)
|
|
mark_as_possibly_superseded(chunk_current[0]) # maybe orphaned the all-zero replacement chunk
|
|
chunk_list.append([chunk_id, size, csize]) # list-typed element as chunks_healthy is list-of-lists
|
|
offset += size
|
|
if chunks_replaced and not has_chunks_healthy:
|
|
# if this is first repair, remember the correct chunk IDs, so we can maybe heal the file later
|
|
item[b'chunks_healthy'] = item[b'chunks']
|
|
if has_chunks_healthy and chunk_list == chunks_healthy:
|
|
logger.info('{}: Completely healed previously damaged file!'.format(
|
|
item[b'path'].decode('utf-8', 'surrogateescape')))
|
|
del item[b'chunks_healthy']
|
|
item[b'chunks'] = chunk_list
|
|
|
|
def robust_iterator(archive):
|
|
"""Iterates through all archive items
|
|
|
|
Missing item chunks will be skipped and the msgpack stream will be restarted
|
|
"""
|
|
item_keys = self.manifest.item_keys
|
|
unpacker = RobustUnpacker(lambda item: isinstance(item, dict) and b'path' in item, item_keys)
|
|
_state = 0
|
|
|
|
def missing_chunk_detector(chunk_id):
|
|
nonlocal _state
|
|
if _state % 2 != int(chunk_id not in self.chunks):
|
|
_state += 1
|
|
return _state
|
|
|
|
def report(msg, chunk_id, chunk_no):
|
|
cid = bin_to_hex(chunk_id)
|
|
msg += ' [chunk: %06d_%s]' % (chunk_no, cid) # see debug-dump-archive-items
|
|
self.error_found = True
|
|
logger.error(msg)
|
|
|
|
def list_keys_safe(keys):
|
|
return ', '.join((k.decode() if isinstance(k, bytes) else str(k) for k in keys))
|
|
|
|
def valid_item(obj):
|
|
if not isinstance(obj, StableDict):
|
|
return False, 'not a dictionary'
|
|
# A bug in Attic up to and including release 0.13 added a (meaningless) b'acl' key to every item.
|
|
# We ignore it here, should it exist. See test_attic013_acl_bug for details.
|
|
obj.pop(b'acl', None)
|
|
keys = set(obj)
|
|
if not REQUIRED_ITEM_KEYS.issubset(keys):
|
|
return False, 'missing required keys: ' + list_keys_safe(REQUIRED_ITEM_KEYS - keys)
|
|
if not keys.issubset(item_keys):
|
|
return False, 'invalid keys: ' + list_keys_safe(keys - item_keys)
|
|
return True, ''
|
|
|
|
i = 0
|
|
for state, items in groupby(archive[b'items'], missing_chunk_detector):
|
|
items = list(items)
|
|
if state % 2:
|
|
for chunk_id in items:
|
|
report('item metadata chunk missing', chunk_id, i)
|
|
i += 1
|
|
continue
|
|
if state > 0:
|
|
unpacker.resync()
|
|
for chunk_id, cdata in zip(items, repository.get_many(items)):
|
|
unpacker.feed(self.key.decrypt(chunk_id, cdata))
|
|
try:
|
|
for item in unpacker:
|
|
valid, reason = valid_item(item)
|
|
if valid:
|
|
yield item
|
|
else:
|
|
report('Did not get expected metadata dict when unpacking item metadata (%s)' % reason, chunk_id, i)
|
|
except RobustUnpacker.UnpackerCrashed as err:
|
|
report('Unpacker crashed while unpacking item metadata, trying to resync...', chunk_id, i)
|
|
unpacker.resync()
|
|
except Exception:
|
|
report('Exception while unpacking item metadata', chunk_id, i)
|
|
raise
|
|
i += 1
|
|
|
|
if archive is None:
|
|
# we need last N or all archives
|
|
archive_items = sorted(self.manifest.archives.items(), reverse=True,
|
|
key=lambda name_info: name_info[1][b'time'])
|
|
if prefix is not None:
|
|
archive_items = [item for item in archive_items if item[0].startswith(prefix)]
|
|
num_archives = len(archive_items)
|
|
end = None if last is None else min(num_archives, last)
|
|
else:
|
|
# we only want one specific archive
|
|
archive_items = [item for item in self.manifest.archives.items() if item[0] == archive]
|
|
num_archives = 1
|
|
end = 1
|
|
|
|
with cache_if_remote(self.repository) as repository:
|
|
for i, (name, info) in enumerate(archive_items[:end]):
|
|
logger.info('Analyzing archive {} ({}/{})'.format(name, num_archives - i, num_archives))
|
|
archive_id = info[b'id']
|
|
if archive_id not in self.chunks:
|
|
logger.error('Archive metadata block is missing!')
|
|
self.error_found = True
|
|
del self.manifest.archives[name]
|
|
continue
|
|
mark_as_possibly_superseded(archive_id)
|
|
cdata = self.repository.get(archive_id)
|
|
data = self.key.decrypt(archive_id, cdata)
|
|
archive = StableDict(msgpack.unpackb(data))
|
|
if archive[b'version'] != 1:
|
|
raise Exception('Unknown archive metadata version')
|
|
decode_dict(archive, (b'name', b'hostname', b'username', b'time', b'time_end'))
|
|
archive[b'cmdline'] = [arg.decode('utf-8', 'surrogateescape') for arg in archive[b'cmdline']]
|
|
items_buffer = ChunkBuffer(self.key)
|
|
items_buffer.write_chunk = add_callback
|
|
for item in robust_iterator(archive):
|
|
if b'chunks' in item:
|
|
verify_file_chunks(item)
|
|
items_buffer.add(item)
|
|
items_buffer.flush(flush=True)
|
|
for previous_item_id in archive[b'items']:
|
|
mark_as_possibly_superseded(previous_item_id)
|
|
archive[b'items'] = items_buffer.chunks
|
|
data = msgpack.packb(archive, unicode_errors='surrogateescape')
|
|
new_archive_id = self.key.id_hash(data)
|
|
cdata = self.key.encrypt(data)
|
|
add_reference(new_archive_id, len(data), len(cdata), cdata)
|
|
info[b'id'] = new_archive_id
|
|
|
|
def orphan_chunks_check(self):
|
|
if self.check_all:
|
|
unused = set()
|
|
for id_, (count, size, csize) in self.chunks.iteritems():
|
|
if count == 0:
|
|
unused.add(id_)
|
|
orphaned = unused - self.possibly_superseded
|
|
if orphaned:
|
|
logger.error('{} orphaned objects found!'.format(len(orphaned)))
|
|
self.error_found = True
|
|
if self.repair:
|
|
for id_ in unused:
|
|
self.repository.delete(id_)
|
|
else:
|
|
logger.info('Orphaned objects check skipped (needs all archives checked).')
|
|
|
|
def finish(self, save_space=False):
|
|
if self.repair:
|
|
self.manifest.write()
|
|
self.repository.commit(save_space=save_space)
|