mirror of https://github.com/borgbackup/borg.git
279 lines
10 KiB
Python
279 lines
10 KiB
Python
from datetime import datetime
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from getpass import getuser
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import logging
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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 .cache import NS_ARCHIVES, NS_CHUNKS, NS_CINDEX
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from .chunkifier import chunkify
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from .helpers import uid2user, user2uid, gid2group, group2gid, IntegrityError
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CHUNK_SIZE = 55001
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class Archive(object):
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def __init__(self, store, crypto, name=None):
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self.crypto = crypto
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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.crypto.id_hash(name))
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def load(self, id):
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self.id = id
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data, hash = self.crypto.decrypt(self.store.get(NS_ARCHIVES, self.id))
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archive = msgpack.unpackb(data)
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if archive['version'] != 1:
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raise Exception('Archive version %r not supported' % archive['version'])
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self.items = archive['items']
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self.name = archive['name']
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data, hash = self.crypto.decrypt(self.store.get(NS_CINDEX, self.id))
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cindex = msgpack.unpackb(data)
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assert cindex['version'] == 1
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if archive['cindex'] != hash:
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raise Exception('decryption failed')
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self.chunks = cindex['chunks']
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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.crypto.id_hash(name)
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cindex = {
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'version': 1,
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'chunks': self.chunks,
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}
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data, cindex_hash = self.crypto.encrypt_create(msgpack.packb(cindex))
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self.store.put(NS_CINDEX, self.id, data)
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archive = {
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'version': 1,
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'name': name,
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'cindex': cindex_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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'ts': datetime.utcnow().isoformat(),
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'items': self.items,
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}
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data, self.hash = self.crypto.encrypt_read(msgpack.packb(archive))
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self.store.put(NS_ARCHIVES, 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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osize = csize = usize = 0
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for item in self.items:
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if item['type'] == 'FILE':
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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 list(self):
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for item in self.items:
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print item['path']
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def extract(self, dest=None):
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dest = dest or os.getcwdu()
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dir_stat_queue = []
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for item in self.items:
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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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if item['type'] == 'DIRECTORY':
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logging.info(path)
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if not os.path.exists(path):
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os.makedirs(path)
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dir_stat_queue.append((path, item))
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continue
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elif item['type'] == 'SYMLINK':
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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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logging.info('%s -> %s', path, 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_stat(path, item, symlink=True)
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elif item['type'] == 'HARDLINK':
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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 = os.path.join(dest, item['source'])
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logging.info('%s => %s', path, 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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elif item['type'] == 'FILE':
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logging.info(path)
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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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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.crypto.decrypt(self.store.get(NS_CHUNKS, id))
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if self.crypto.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_stat(path, item)
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else:
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raise Exception('Unknown archive item type %r' % item['type'])
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if dir_stat_queue and not path.startswith(dir_stat_queue[-1][0]):
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self.restore_stat(*dir_stat_queue.pop())
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def restore_stat(self, path, item, symlink=False):
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os.lchmod(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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if hasattr(os, 'lchown'): # Not available on Linux
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os.lchown(path, uid, gid)
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elif not symlink:
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os.chown(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['ctime'], item['mtime']))
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def verify(self):
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for item in self.items:
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if item['type'] == 'FILE':
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item['path'] = item['path'].decode('utf-8')
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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.crypto.decrypt(self.store.get(NS_CHUNKS, id))
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if self.crypto.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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logging.error('%s ... ERROR', item['path'])
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break
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else:
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logging.info('%s ... OK', item['path'])
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def delete(self, cache):
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self.store.delete(NS_ARCHIVES, self.id)
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self.store.delete(NS_CINDEX, 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 _walk(self, path):
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st = os.lstat(path)
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yield path, st
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if stat.S_ISDIR(st.st_mode):
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for f in os.listdir(path):
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for x in self._walk(os.path.join(path, f)):
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yield x
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def create(self, name, paths, cache):
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id = self.crypto.id_hash(name)
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try:
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self.store.get(NS_ARCHIVES, id)
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except self.store.DoesNotExist:
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pass
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else:
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raise NameError('Archive already exists')
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for path in paths:
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for path, st in self._walk(unicode(path)):
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if stat.S_ISDIR(st.st_mode):
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self.process_dir(path, st)
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elif stat.S_ISLNK(st.st_mode):
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self.process_symlink(path, st)
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elif stat.S_ISREG(st.st_mode):
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self.process_file(path, st, cache)
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else:
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logging.error('Unknown file type: %s', path)
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self.save(name)
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cache.save()
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def process_dir(self, path, st):
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path = path.lstrip('/\\:')
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logging.info(path)
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self.items.append({
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'type': 'DIRECTORY', 'path': path,
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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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'ctime': st.st_ctime, 'mtime': st.st_mtime,
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})
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def process_symlink(self, path, st):
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source = os.readlink(path)
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path = path.lstrip('/\\:')
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logging.info('%s -> %s', path, source)
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self.items.append({
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'type': 'SYMLINK', 'path': path, 'source': source,
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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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'ctime': st.st_ctime, 'mtime': st.st_mtime,
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})
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def process_file(self, path, st, cache):
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safe_path = path.lstrip('/\\:')
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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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logging.info('%s => %s', path, source)
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self.items.append({ 'type': 'HARDLINK',
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'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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try:
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fd = open(path, 'rb')
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except IOError, e:
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logging.error(e)
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return
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with fd:
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logging.info(safe_path)
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chunks = []
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size = 0
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for chunk in chunkify(fd, CHUNK_SIZE, 30):
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chunks.append(self.process_chunk(chunk, cache))
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size += len(chunk)
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self.items.append({
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'type': 'FILE', 'path': safe_path, 'chunks': chunks, 'size': size,
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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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'ctime': st.st_ctime, 'mtime': st.st_mtime,
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})
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def process_chunk(self, data, cache):
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id = self.crypto.id_hash(data)
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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.add_chunk(id, data, self.crypto)
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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, crypto):
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for id in store.list(NS_ARCHIVES):
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archive = Archive(store, crypto)
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archive.load(id)
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yield archive
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