mirror of https://github.com/borgbackup/borg.git
294 lines
10 KiB
Python
294 lines
10 KiB
Python
from datetime import datetime
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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 xattr import xattr, XATTR_NOFOLLOW
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from . import NS_ARCHIVE_METADATA, NS_ARCHIVE_ITEMS, NS_ARCHIVE_CHUNKS, 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, keychain, name=None):
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self.keychain = keychain
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self.store = store
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self.items = []
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self.chunks = []
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self.chunk_idx = {}
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self.hard_links = {}
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if name:
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self.load(self.keychain.id_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.keychain.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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def get_items(self):
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data, chunks_hash = self.keychain.decrypt(self.store.get(NS_ARCHIVE_CHUNKS, self.id))
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chunks = msgpack.unpackb(data)
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assert chunks['version'] == 1
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assert self.metadata['chunks_hash'] == chunks_hash
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self.chunks = chunks['chunks']
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data, items_hash = self.keychain.decrypt(self.store.get(NS_ARCHIVE_ITEMS, self.id))
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items = msgpack.unpackb(data)
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assert items['version'] == 1
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assert self.metadata['items_hash'] == items_hash
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self.items = items['items']
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for i, chunk in enumerate(self.chunks):
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self.chunk_idx[i] = chunk[0]
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def save(self, name):
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self.id = self.keychain.id_hash(name)
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chunks = {'version': 1, 'chunks': self.chunks}
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data, chunks_hash = self.keychain.encrypt_create(msgpack.packb(chunks))
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self.store.put(NS_ARCHIVE_CHUNKS, self.id, data)
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items = {'version': 1, 'items': self.items}
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data, items_hash = self.keychain.encrypt_read(msgpack.packb(items))
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self.store.put(NS_ARCHIVE_ITEMS, self.id, data)
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metadata = {
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'version': 1,
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'name': name,
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'chunks_hash': chunks_hash,
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'items_hash': items_hash,
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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.keychain.encrypt_read(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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def add_chunk(self, id, size):
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try:
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return self.chunk_idx[id]
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except KeyError:
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idx = len(self.chunks)
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self.chunks.append((id, size))
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self.chunk_idx[id] = idx
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return idx
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def stats(self, cache):
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self.get_items()
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osize = csize = usize = 0
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for item in self.items:
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if stat.S_ISREG(item['mode']) and not 'source' in item:
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osize += item['size']
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for id, size in self.chunks:
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csize += size
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if cache.seen_chunk(id) == 1:
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usize += size
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return osize, csize, usize
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def extract_item(self, item, dest=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'])
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if os.path.exists(path):
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os.unlink(path)
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os.link(source, path)
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else:
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with open(path, 'wb') as fd:
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for chunk in item['chunks']:
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id = self.chunk_idx[chunk]
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try:
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data, hash = self.keychain.decrypt(self.store.get(NS_CHUNK, id))
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if self.keychain.id_hash(data) != id:
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raise IntegrityError('chunk id did not match')
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fd.write(data)
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except ValueError:
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raise Exception('Invalid chunk checksum')
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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['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['atime'], item['mtime']))
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def verify_file(self, item):
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for chunk in item['chunks']:
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id = self.chunk_idx[chunk]
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try:
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data, hash = self.keychain.decrypt(self.store.get(NS_CHUNK, id))
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if self.keychain.id_hash(data) != id:
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raise IntegrityError('chunk id did not match')
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except IntegrityError:
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return False
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return True
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def delete(self, cache):
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self.get_items()
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self.store.delete(NS_ARCHIVE_CHUNKS, self.id)
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self.store.delete(NS_ARCHIVE_ITEMS, self.id)
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self.store.delete(NS_ARCHIVE_METADATA, self.id)
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for id, size in self.chunks:
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cache.chunk_decref(id)
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self.store.commit()
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cache.save()
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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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'atime': st.st_atime, '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.items.append(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.items.append(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.items.append(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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self.items.append({'path': path, 'source': source})
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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.keychain.id_hash(path.encode('utf-8'))
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ids, size = cache.file_known_and_unchanged(path_hash, st)
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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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ids = None
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break
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else:
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chunks = [self.process_chunk2(id, cache) for id in ids]
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# Only chunkify the file if needed
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if ids is None:
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fd = open(path, 'rb')
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with open(path, 'rb') as fd:
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size = 0
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ids = []
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chunks = []
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for chunk in chunkify(fd, CHUNK_SIZE, WINDOW_SIZE,
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self.keychain.get_chunkify_seed()):
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id = self.keychain.id_hash(chunk)
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ids.append(id)
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try:
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chunks.append(self.chunk_idx[id])
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except KeyError:
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chunks.append(self.process_chunk(id, chunk, cache))
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size += len(chunk)
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cache.memorize_file_chunks(path_hash, st, ids)
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item = {'path': safe_path, 'chunks': chunks, 'size': size}
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item.update(self.stat_attrs(st, path))
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self.items.append(item)
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def process_chunk2(self, id, cache):
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try:
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return self.chunk_idx[id]
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except KeyError:
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idx = len(self.chunks)
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size = cache.chunk_incref(id)
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self.chunks.append((id, size))
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self.chunk_idx[id] = idx
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return idx
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def process_chunk(self, id, data, cache):
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idx = len(self.chunks)
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size = cache.add_chunk(id, data)
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self.chunks.append((id, size))
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self.chunk_idx[id] = idx
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return idx
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@staticmethod
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def list_archives(store, keychain):
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for id in list(store.list(NS_ARCHIVE_METADATA)):
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archive = Archive(store, keychain)
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archive.load(id)
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yield archive
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