mirror of https://github.com/borgbackup/borg.git
343 lines
12 KiB
Python
343 lines
12 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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from os.path import dirname
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from xattr import xattr, XATTR_NOFOLLOW
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from . import NS_ARCHIVE_METADATA, NS_CHUNK
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from ._speedups import chunkify
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from .helpers import uid2user, user2uid, gid2group, group2gid, IntegrityError
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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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def __init__(self, store, key, name=None, cache=None):
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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.items = ''
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self.items_refs = []
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self.items_prefix = ''
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self.items_ids = []
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self.hard_links = {}
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if name:
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self.load(self.key.archive_hash(name))
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def load(self, id):
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self.id = id
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try:
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data, self.hash = self.key.decrypt(self.store.get(NS_ARCHIVE_METADATA, self.id))
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except self.store.DoesNotExist:
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raise self.DoesNotExist
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self.metadata = msgpack.unpackb(data)
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assert self.metadata['version'] == 1
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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 iter_items(self, callback):
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unpacker = msgpack.Unpacker()
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def cb(chunk, error, id):
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data, items_hash = self.key.decrypt(chunk)
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assert self.key.id_hash(data) == id
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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, size, csize in self.metadata['items']:
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self.store.get(NS_CHUNK, id, callback=cb, callback_data=id)
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def add_item(self, item, refs=None):
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data = msgpack.packb(item)
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prefix = dirname(item['path'])
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if self.items_prefix and self.items_prefix != prefix:
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self.flush_items()
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if refs:
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self.items_refs += refs
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self.items += data
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self.items_prefix = prefix
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def flush_items(self):
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if not self.items:
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return
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id = self.key.id_hash(self.items)
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if self.cache.seen_chunk(id):
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self.items_ids.append(self.cache.chunk_incref(id))
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for id in self.items_refs:
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self.cache.chunk_decref(id)
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else:
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self.items_ids.append(self.cache.add_chunk(id, self.items))
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self.items = ''
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self.items_refs = []
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self.items_prefix = ''
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def save(self, name, cache):
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self.id = self.key.archive_hash(name)
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self.flush_items()
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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, self.hash = self.key.encrypt(msgpack.packb(metadata))
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self.store.put(NS_ARCHIVE_METADATA, self.id, data)
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self.store.commit()
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cache.commit()
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def 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, unique)):
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assert not error
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data, items_hash = self.key.decrypt(chunk)
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assert self.key.id_hash(data) == id
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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['osize'] += size
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stats['csize'] += csize
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if unique and count == 1:
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stats['usize'] += csize
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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 = {'osize': 0, 'csize': 0, 'usize': 0}
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for id, size, csize in self.metadata['items']:
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stats['osize'] += size
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stats['csize'] += csize
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unique = self.cache.seen_chunk(id) == 1
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if unique:
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stats['usize'] += csize
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self.store.get(NS_CHUNK, id, callback=cb, callback_data=(id, unique))
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self.cache.chunk_decref(id)
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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):
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dest = dest or os.getcwdu()
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dir_stat_queue = []
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assert item['path'][0] not in ('/', '\\', ':')
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path = os.path.join(dest, item['path'].decode('utf-8'))
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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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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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source = os.path.join(dest, item['source'].decode('utf-8'))
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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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def extract_cb(chunk, error, (id, i, last)):
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if i==0:
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start_cb(item)
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assert not error
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data, hash = self.key.decrypt(chunk)
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if self.key.id_hash(data) != id:
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raise IntegrityError('chunk hash did not match')
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fd.write(data)
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if last:
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fd.close()
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self.restore_attrs(path, item)
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fd = open(path, 'wb')
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n = len(item['chunks'])
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if n == 0:
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start_cb(item)
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self.restore_attrs(path, item)
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fd.close()
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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(NS_CHUNK, id, callback=extract_cb, callback_data=(id, i, i==n-1))
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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 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, last)):
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if i == 0:
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start(item)
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assert not error
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data, hash = self.key.decrypt(chunk)
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if self.key.id_hash(data) != id:
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result(item, False)
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elif last:
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result(item, True)
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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(NS_CHUNK, id, callback=verify_chunk, callback_data=(id, i, i==n-1))
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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, items_hash = self.key.decrypt(chunk)
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assert self.key.id_hash(data) == id
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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, size, csize in self.metadata['items']:
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if self.cache.seen_chunk(id) == 1:
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self.store.get(NS_CHUNK, id, callback=callback, callback_data=id)
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else:
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self.cache.chunk_decref(id)
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self.store.flush_rpc()
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self.store.delete(NS_ARCHIVE_METADATA, self.id)
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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.encode('utf-8'))
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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) 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))
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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.add_item(item, ids)
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@staticmethod
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def list_archives(store, key):
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for id in list(store.list(NS_ARCHIVE_METADATA)):
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archive = Archive(store, key)
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archive.load(id)
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yield archive
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