mirror of https://github.com/borgbackup/borg.git
379 lines
13 KiB
Python
379 lines
13 KiB
Python
from __future__ import with_statement
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from datetime import datetime, timedelta
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from getpass import getuser
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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 cStringIO import StringIO
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from xattr import xattr, XATTR_NOFOLLOW
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from ._speedups import chunkify
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from .helpers import uid2user, user2uid, gid2group, group2gid, \
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Counter, encode_filename, Statistics
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ITEMS_BUFFER = 1024 * 1024
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CHUNK_SIZE = 64 * 1024
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WINDOW_SIZE = 4096
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have_lchmod = hasattr(os, 'lchmod')
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linux = sys.platform == 'linux2'
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class Archive(object):
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class DoesNotExist(Exception):
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pass
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class AlreadyExists(Exception):
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pass
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def __init__(self, store, key, manifest, name, cache=None, create=False, checkpoint_interval=300):
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self.key = key
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self.store = store
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self.cache = cache
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self.manifest = manifest
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self.items = StringIO()
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self.items_ids = []
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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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if create:
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if name in manifest.archives:
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raise self.AlreadyExists
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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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try:
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info = self.manifest.archives[name]
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except KeyError:
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raise self.DoesNotExist
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self.load(info['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.store.get(self.id))
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self.metadata = msgpack.unpackb(data)
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if self.metadata['version'] != 1:
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raise Exception('Unknown archive metadata version')
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self.name = self.metadata['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['time'].split('.', 1)
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return datetime.strptime(t, '%Y-%m-%dT%H:%M:%S') + 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, callback):
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unpacker = msgpack.Unpacker()
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counter = Counter(0)
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def cb(chunk, error, id):
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if error:
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raise error
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assert not error
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counter.dec()
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data = self.key.decrypt(id, chunk)
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unpacker.feed(data)
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for item in unpacker:
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callback(item)
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for id in self.metadata['items']:
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# Limit the number of concurrent items requests to 10
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self.store.flush_rpc(counter, 10)
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counter.inc()
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self.store.get(id, callback=cb, callback_data=id)
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def add_item(self, item):
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self.items.write(msgpack.packb(item))
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now = time.time()
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if now - self.last_checkpoint > self.checkpoint_interval:
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self.last_checkpoint = now
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self.write_checkpoint()
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if self.items.tell() > ITEMS_BUFFER:
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self.flush_items()
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def flush_items(self, flush=False):
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if self.items.tell() == 0:
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return
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self.items.seek(0)
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chunks = list(str(s) for s in chunkify(self.items, CHUNK_SIZE, WINDOW_SIZE, self.key.chunk_seed))
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self.items.seek(0)
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self.items.truncate()
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for chunk in chunks[:-1]:
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id, _, _ = self.cache.add_chunk(self.key.id_hash(chunk), chunk, self.stats)
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self.items_ids.append(id)
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if flush or len(chunks) == 1:
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id, _, _ = self.cache.add_chunk(self.key.id_hash(chunks[-1]), chunks[-1], self.stats)
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self.items_ids.append(id)
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else:
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self.items.write(chunks[-1])
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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)
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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.flush_items(flush=True)
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metadata = {
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'version': 1,
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'name': name,
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'items': self.items_ids,
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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)
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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.store.commit()
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self.cache.commit()
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def calc_stats(self, cache):
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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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def cb(chunk, error, id):
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assert not error
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data = self.key.decrypt(id, chunk)
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unpacker.feed(data)
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for item in unpacker:
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try:
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for id, size, csize in item['chunks']:
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count, _, _ = self.cache.chunks[id]
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stats.update(size, csize, count == 1)
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stats.nfiles += 1
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self.cache.chunks[id] = count - 1, size, csize
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except KeyError:
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pass
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unpacker = msgpack.Unpacker()
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cache.begin_txn()
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stats = Statistics()
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for id in self.metadata['items']:
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self.store.get(id, callback=cb, callback_data=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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self.store.flush_rpc()
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cache.rollback()
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return stats
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def extract_item(self, item, dest=None, start_cb=None, restore_attrs=True):
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dest = dest or os.getcwdu()
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assert item['path'][0] not in ('/', '\\', ':')
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path = os.path.join(dest, encode_filename(item['path']))
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mode = item['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_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['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_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 'source' in item:
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def link_cb(_, __, item):
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source = os.path.join(dest, item['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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self.store.add_callback(link_cb, item)
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else:
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def extract_cb(chunk, error, (id, i)):
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if i == 0:
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state['fd'] = open(path, 'wb')
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start_cb(item)
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assert not error
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data = self.key.decrypt(id, chunk)
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state['fd'].write(data)
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if i == n - 1:
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state['fd'].close()
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self.restore_attrs(path, item)
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state = {}
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n = len(item['chunks'])
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## 0 chunks indicates an empty (0 bytes) file
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if n == 0:
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open(path, 'wb').close()
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start_cb(item)
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self.restore_attrs(path, item)
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else:
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for i, (id, size, csize) in enumerate(item['chunks']):
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self.store.get(id, callback=extract_cb, callback_data=(id, i))
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else:
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raise Exception('Unknown archive item type %r' % item['mode'])
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def restore_attrs(self, path, item, symlink=False):
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xattrs = item.get('xattrs')
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if xattrs:
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xa = xattr(path, XATTR_NOFOLLOW)
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for k, v in xattrs.items():
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try:
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xa.set(k, v)
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except (IOError, KeyError):
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pass
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if have_lchmod:
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os.lchmod(path, item['mode'])
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elif not symlink:
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os.chmod(path, item['mode'])
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uid = user2uid(item['user']) or item['uid']
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gid = group2gid(item['group']) or item['gid']
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try:
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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 not symlink:
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# FIXME: We should really call futimes here (c extension required)
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os.utime(path, (item['mtime'], item['mtime']))
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def verify_file(self, item, start, result):
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def verify_chunk(chunk, error, (id, i)):
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if error:
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if not state:
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result(item, False)
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state[True] = True
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return
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if i == 0:
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start(item)
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self.key.decrypt(id, chunk)
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if i == n - 1:
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result(item, True)
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state = {}
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n = len(item['chunks'])
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if n == 0:
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start(item)
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result(item, True)
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else:
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for i, (id, size, csize) in enumerate(item['chunks']):
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self.store.get(id, callback=verify_chunk, callback_data=(id, i))
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def delete(self, cache):
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def callback(chunk, error, id):
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assert not error
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data = self.key.decrypt(id, chunk)
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unpacker.feed(data)
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for item in unpacker:
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try:
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for chunk_id, size, csize in item['chunks']:
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self.cache.chunk_decref(chunk_id)
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except KeyError:
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pass
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self.cache.chunk_decref(id)
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unpacker = msgpack.Unpacker()
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for id in self.metadata['items']:
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self.store.get(id, callback=callback, callback_data=id)
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self.store.flush_rpc()
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self.cache.chunk_decref(self.id)
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del self.manifest.archives[self.name]
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self.manifest.write()
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self.store.commit()
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cache.commit()
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def stat_attrs(self, st, path):
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item = {
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'mode': st.st_mode,
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'uid': st.st_uid, 'user': uid2user(st.st_uid),
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'gid': st.st_gid, 'group': gid2group(st.st_gid),
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'mtime': st.st_mtime,
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}
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try:
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xa = xattr(path, XATTR_NOFOLLOW)
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xattrs = {}
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for key in xa:
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# Only store the user namespace on Linux
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if linux and not key.startswith('user'):
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continue
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xattrs[key] = xa[key]
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if xattrs:
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item['xattrs'] = xattrs
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except IOError:
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pass
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return item
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def process_dir(self, path, st):
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item = {'path': path.lstrip('/\\:')}
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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_fifo(self, path, st):
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item = {'path': path.lstrip('/\\:')}
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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 = {'path': path.lstrip('/\\:'), '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 = path.lstrip('/\\:')
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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({'path': safe_path, '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(path)
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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 open(path, 'rb') as fd:
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chunks = []
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for chunk in chunkify(fd, CHUNK_SIZE, WINDOW_SIZE,
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self.key.chunk_seed):
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chunks.append(cache.add_chunk(self.key.id_hash(chunk), chunk, self.stats))
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ids = [id for id, _, _ in chunks]
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cache.memorize_file(path_hash, st, ids)
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item = {'path': safe_path, '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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@staticmethod
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def list_archives(store, key, manifest, cache=None):
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for name, info in manifest.archives.items():
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yield Archive(store, key, manifest, name, cache=cache)
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