from datetime import datetime from getpass import getuser import msgpack import os import socket import stat import sys from xattr import xattr, XATTR_NOFOLLOW from . import NS_ARCHIVE_METADATA, NS_ARCHIVE_ITEMS, NS_ARCHIVE_CHUNKS, NS_CHUNK from ._speedups import chunkify from .helpers import uid2user, user2uid, gid2group, group2gid, IntegrityError CHUNK_SIZE = 64 * 1024 WINDOW_SIZE = 4096 have_lchmod = hasattr(os, 'lchmod') linux = sys.platform == 'linux2' class Archive(object): class DoesNotExist(Exception): pass def __init__(self, store, keychain, name=None): self.keychain = keychain self.store = store self.items = [] self.chunks = [] self.chunk_idx = {} self.hard_links = {} if name: self.load(self.keychain.id_hash(name)) def load(self, id): self.id = id try: data, self.hash = self.keychain.decrypt(self.store.get(NS_ARCHIVE_METADATA, self.id)) except self.store.DoesNotExist: raise self.DoesNotExist self.metadata = msgpack.unpackb(data) assert self.metadata['version'] == 1 def get_items(self): data, chunks_hash = self.keychain.decrypt(self.store.get(NS_ARCHIVE_CHUNKS, self.id)) chunks = msgpack.unpackb(data) assert chunks['version'] == 1 assert self.metadata['chunks_hash'] == chunks_hash self.chunks = chunks['chunks'] data, items_hash = self.keychain.decrypt(self.store.get(NS_ARCHIVE_ITEMS, self.id)) items = msgpack.unpackb(data) assert items['version'] == 1 assert self.metadata['items_hash'] == items_hash self.items = items['items'] for i, chunk in enumerate(self.chunks): self.chunk_idx[i] = chunk[0] def save(self, name): self.id = self.keychain.id_hash(name) chunks = {'version': 1, 'chunks': self.chunks} data, chunks_hash = self.keychain.encrypt_create(msgpack.packb(chunks)) self.store.put(NS_ARCHIVE_CHUNKS, self.id, data) items = {'version': 1, 'items': self.items} data, items_hash = self.keychain.encrypt_read(msgpack.packb(items)) self.store.put(NS_ARCHIVE_ITEMS, self.id, data) metadata = { 'version': 1, 'name': name, 'chunks_hash': chunks_hash, 'items_hash': items_hash, 'cmdline': sys.argv, 'hostname': socket.gethostname(), 'username': getuser(), 'time': datetime.utcnow().isoformat(), } data, self.hash = self.keychain.encrypt_read(msgpack.packb(metadata)) self.store.put(NS_ARCHIVE_METADATA, self.id, data) self.store.commit() def stats(self, cache): self.get_items() osize = csize = usize = 0 for item in self.items: if stat.S_ISREG(item['mode']) and not 'source' in item: osize += item['size'] for id, size in self.chunks: csize += size if cache.seen_chunk(id) == 1: usize += size return osize, csize, usize def extract_item(self, item, dest=None): dest = dest or os.getcwdu() dir_stat_queue = [] assert item['path'][0] not in ('/', '\\', ':') path = os.path.join(dest, item['path'].decode('utf-8')) mode = item['mode'] if stat.S_ISDIR(mode): if not os.path.exists(path): os.makedirs(path) self.restore_attrs(path, item) elif stat.S_ISFIFO(mode): if not os.path.exists(os.path.dirname(path)): os.makedirs(os.path.dirname(path)) os.mkfifo(path) self.restore_attrs(path, item) elif stat.S_ISLNK(mode): if not os.path.exists(os.path.dirname(path)): os.makedirs(os.path.dirname(path)) source = item['source'] if os.path.exists(path): os.unlink(path) os.symlink(source, path) self.restore_attrs(path, item, symlink=True) elif stat.S_ISREG(mode): if not os.path.exists(os.path.dirname(path)): os.makedirs(os.path.dirname(path)) # Hard link? if 'source' in item: source = os.path.join(dest, item['source']) if os.path.exists(path): os.unlink(path) os.link(source, path) else: with open(path, 'wb') as fd: for chunk in item['chunks']: id = self.chunk_idx[chunk] try: data, hash = self.keychain.decrypt(self.store.get(NS_CHUNK, id)) if self.keychain.id_hash(data) != id: raise IntegrityError('chunk id did not match') fd.write(data) except ValueError: raise Exception('Invalid chunk checksum') self.restore_attrs(path, item) else: raise Exception('Unknown archive item type %r' % item['mode']) def restore_attrs(self, path, item, symlink=False): xattrs = item.get('xattrs') if xattrs: xa = xattr(path, XATTR_NOFOLLOW) for k, v in xattrs.items(): try: xa.set(k, v) except KeyError: pass if have_lchmod: os.lchmod(path, item['mode']) elif not symlink: os.chmod(path, item['mode']) uid = user2uid(item['user']) or item['uid'] gid = group2gid(item['group']) or item['gid'] try: os.lchown(path, uid, gid) except OSError: pass if not symlink: # FIXME: We should really call futimes here (c extension required) os.utime(path, (item['atime'], item['mtime'])) def verify_file(self, item): for chunk in item['chunks']: id = self.chunk_idx[chunk] try: data, hash = self.keychain.decrypt(self.store.get(NS_CHUNK, id)) if self.keychain.id_hash(data) != id: raise IntegrityError('chunk id did not match') except IntegrityError: return False return True def delete(self, cache): self.get_items() self.store.delete(NS_ARCHIVE_CHUNKS, self.id) self.store.delete(NS_ARCHIVE_ITEMS, self.id) self.store.delete(NS_ARCHIVE_METADATA, self.id) for id, size in self.chunks: cache.chunk_decref(id) self.store.commit() cache.save() def stat_attrs(self, st, path): item = { 'mode': st.st_mode, 'uid': st.st_uid, 'user': uid2user(st.st_uid), 'gid': st.st_gid, 'group': gid2group(st.st_gid), 'atime': st.st_atime, 'mtime': st.st_mtime, } try: xa = xattr(path, XATTR_NOFOLLOW) xattrs = {} for key in xa: # Only store the user namespace on Linux if linux and not key.startswith('user'): continue xattrs[key] = xa[key] if xattrs: item['xattrs'] = xattrs except IOError: pass return item def process_dir(self, path, st): item = {'path': path.lstrip('/\\:')} item.update(self.stat_attrs(st, path)) self.items.append(item) def process_fifo(self, path, st): item = {'path': path.lstrip('/\\:')} item.update(self.stat_attrs(st, path)) self.items.append(item) def process_symlink(self, path, st): source = os.readlink(path) item = {'path': path.lstrip('/\\:'), 'source': source} item.update(self.stat_attrs(st, path)) self.items.append(item) def process_file(self, path, st, cache): safe_path = path.lstrip('/\\:') # Is it a hard link? if st.st_nlink > 1: source = self.hard_links.get((st.st_ino, st.st_dev)) if (st.st_ino, st.st_dev) in self.hard_links: self.items.append({'path': path, 'source': source}) return else: self.hard_links[st.st_ino, st.st_dev] = safe_path path_hash = self.keychain.id_hash(path.encode('utf-8')) ids, size = cache.file_known_and_unchanged(path_hash, st) if ids is not None: # Make sure all ids are available for id in ids: if not cache.seen_chunk(id): ids = None break else: chunks = [self.process_chunk2(id, cache) for id in ids] # Only chunkify the file if needed if ids is None: fd = open(path, 'rb') with open(path, 'rb') as fd: size = 0 ids = [] chunks = [] for chunk in chunkify(fd, CHUNK_SIZE, WINDOW_SIZE, self.keychain.get_chunkify_seed()): id = self.keychain.id_hash(chunk) ids.append(id) try: chunks.append(self.chunk_idx[id]) except KeyError: chunks.append(self.process_chunk(id, chunk, cache)) size += len(chunk) cache.memorize_file_chunks(path_hash, st, ids) item = {'path': safe_path, 'chunks': chunks, 'size': size} item.update(self.stat_attrs(st, path)) self.items.append(item) def process_chunk2(self, id, cache): try: return self.chunk_idx[id] except KeyError: idx = len(self.chunks) id, size = cache.chunk_incref(id) self.chunks.append((id, size)) self.chunk_idx[id] = idx return idx def process_chunk(self, id, data, cache): idx = len(self.chunks) id, size = cache.add_chunk(id, data) self.chunks.append((id, size)) self.chunk_idx[id] = idx return idx @staticmethod def list_archives(store, keychain): for id in list(store.list(NS_ARCHIVE_METADATA)): archive = Archive(store, keychain) archive.load(id) yield archive