mirror of
https://github.com/borgbackup/borg.git
synced 2024-12-24 16:55:36 +00:00
414 lines
15 KiB
Python
414 lines
15 KiB
Python
from datetime import datetime, timedelta
|
|
from getpass import getuser
|
|
from itertools import zip_longest
|
|
import msgpack
|
|
import os
|
|
import socket
|
|
import stat
|
|
import sys
|
|
import time
|
|
from io import BytesIO
|
|
from . import xattr
|
|
from .chunker import chunkify
|
|
from .helpers import uid2user, user2uid, gid2group, group2gid, \
|
|
Statistics, decode_dict, st_mtime_ns
|
|
|
|
ITEMS_BUFFER = 1024 * 1024
|
|
CHUNK_MIN = 1024
|
|
WINDOW_SIZE = 0xfff
|
|
CHUNK_MASK = 0xffff
|
|
|
|
utime_supports_fd = os.utime in getattr(os, 'supports_fd', {})
|
|
has_mtime_ns = sys.version >= '3.3'
|
|
has_lchmod = hasattr(os, 'lchmod')
|
|
|
|
|
|
class ItemIter(object):
|
|
|
|
def __init__(self, unpacker, filter):
|
|
self.unpacker = iter(unpacker)
|
|
self.filter = filter
|
|
self.stack = []
|
|
self.peeks = 0
|
|
self._peek = None
|
|
self._peek_iter = None
|
|
global foo
|
|
foo = self
|
|
|
|
def __iter__(self):
|
|
return self
|
|
|
|
def __next__(self):
|
|
if self.stack:
|
|
item = self.stack.pop(0)
|
|
else:
|
|
self._peek = None
|
|
item = self.get_next()
|
|
self.peeks = max(0, self.peeks - len(item.get(b'chunks', [])))
|
|
return item
|
|
|
|
def get_next(self):
|
|
while True:
|
|
n = next(self.unpacker)
|
|
decode_dict(n, (b'path', b'source', b'user', b'group'))
|
|
if not self.filter or self.filter(n):
|
|
return n
|
|
|
|
def peek(self):
|
|
while True:
|
|
while not self._peek or not self._peek_iter:
|
|
if self.peeks > 100:
|
|
raise StopIteration
|
|
self._peek = self.get_next()
|
|
self.stack.append(self._peek)
|
|
if b'chunks' in self._peek:
|
|
self._peek_iter = iter(self._peek[b'chunks'])
|
|
else:
|
|
self._peek_iter = None
|
|
try:
|
|
item = next(self._peek_iter)
|
|
self.peeks += 1
|
|
return item
|
|
except StopIteration:
|
|
self._peek = None
|
|
|
|
|
|
class Archive(object):
|
|
|
|
class DoesNotExist(Exception):
|
|
pass
|
|
|
|
class AlreadyExists(Exception):
|
|
pass
|
|
|
|
def __init__(self, repository, key, manifest, name, cache=None, create=False,
|
|
checkpoint_interval=300, numeric_owner=False):
|
|
self.cwd = os.getcwd()
|
|
self.key = key
|
|
self.repository = repository
|
|
self.cache = cache
|
|
self.manifest = manifest
|
|
self.items = BytesIO()
|
|
self.items_ids = []
|
|
self.hard_links = {}
|
|
self.stats = Statistics()
|
|
self.name = name
|
|
self.checkpoint_interval = checkpoint_interval
|
|
self.numeric_owner = numeric_owner
|
|
if create:
|
|
if name in manifest.archives:
|
|
raise self.AlreadyExists(name)
|
|
self.last_checkpoint = time.time()
|
|
i = 0
|
|
while True:
|
|
self.checkpoint_name = '%s.checkpoint%s' % (name, i and ('.%d' % i) or '')
|
|
if not self.checkpoint_name in manifest.archives:
|
|
break
|
|
i += 1
|
|
else:
|
|
if name not in self.manifest.archives:
|
|
raise self.DoesNotExist(name)
|
|
info = self.manifest.archives[name]
|
|
self.load(info[b'id'])
|
|
|
|
def load(self, id):
|
|
self.id = id
|
|
data = self.key.decrypt(self.id, self.repository.get(self.id))
|
|
self.metadata = msgpack.unpackb(data)
|
|
if self.metadata[b'version'] != 1:
|
|
raise Exception('Unknown archive metadata version')
|
|
decode_dict(self.metadata, (b'name', b'hostname', b'username', b'time'))
|
|
self.metadata[b'cmdline'] = [arg.decode('utf-8', 'surrogateescape') for arg in self.metadata[b'cmdline']]
|
|
self.name = self.metadata[b'name']
|
|
|
|
@property
|
|
def ts(self):
|
|
"""Timestamp of archive creation in UTC"""
|
|
t, f = self.metadata[b'time'].split('.', 1)
|
|
return datetime.strptime(t, '%Y-%m-%dT%H:%M:%S') + timedelta(seconds=float('.' + f))
|
|
|
|
def __repr__(self):
|
|
return 'Archive(%r)' % self.name
|
|
|
|
def iter_items(self, filter=None):
|
|
unpacker = msgpack.Unpacker(use_list=False)
|
|
i = 0
|
|
n = 20
|
|
while True:
|
|
items = self.metadata[b'items'][i:i + n]
|
|
i += n
|
|
if not items:
|
|
break
|
|
for id, chunk in [(id, chunk) for id, chunk in zip_longest(items, self.repository.get_many(items))]:
|
|
unpacker.feed(self.key.decrypt(id, chunk))
|
|
iter = ItemIter(unpacker, filter)
|
|
for item in iter:
|
|
yield item, iter.peek
|
|
|
|
def add_item(self, item):
|
|
self.items.write(msgpack.packb(item, unicode_errors='surrogateescape'))
|
|
now = time.time()
|
|
if now - self.last_checkpoint > self.checkpoint_interval:
|
|
self.last_checkpoint = now
|
|
self.write_checkpoint()
|
|
if self.items.tell() > ITEMS_BUFFER:
|
|
self.flush_items()
|
|
|
|
def flush_items(self, flush=False):
|
|
if self.items.tell() == 0:
|
|
return
|
|
self.items.seek(0)
|
|
chunks = list(bytes(s) for s in chunkify(self.items, WINDOW_SIZE, CHUNK_MASK, CHUNK_MIN, self.key.chunk_seed))
|
|
self.items.seek(0)
|
|
self.items.truncate()
|
|
for chunk in chunks[:-1]:
|
|
id, _, _ = self.cache.add_chunk(self.key.id_hash(chunk), chunk, self.stats)
|
|
self.items_ids.append(id)
|
|
if flush or len(chunks) == 1:
|
|
id, _, _ = self.cache.add_chunk(self.key.id_hash(chunks[-1]), chunks[-1], self.stats)
|
|
self.items_ids.append(id)
|
|
else:
|
|
self.items.write(chunks[-1])
|
|
|
|
def write_checkpoint(self):
|
|
self.save(self.checkpoint_name)
|
|
del self.manifest.archives[self.checkpoint_name]
|
|
self.cache.chunk_decref(self.id)
|
|
|
|
def save(self, name=None):
|
|
name = name or self.name
|
|
if name in self.manifest.archives:
|
|
raise self.AlreadyExists(name)
|
|
self.flush_items(flush=True)
|
|
metadata = {
|
|
'version': 1,
|
|
'name': name,
|
|
'items': self.items_ids,
|
|
'cmdline': sys.argv,
|
|
'hostname': socket.gethostname(),
|
|
'username': getuser(),
|
|
'time': datetime.utcnow().isoformat(),
|
|
}
|
|
data = msgpack.packb(metadata, unicode_errors='surrogateescape')
|
|
self.id = self.key.id_hash(data)
|
|
self.cache.add_chunk(self.id, data, self.stats)
|
|
self.manifest.archives[name] = {'id': self.id, 'time': metadata['time']}
|
|
self.manifest.write()
|
|
self.repository.commit()
|
|
self.cache.commit()
|
|
|
|
def calc_stats(self, cache):
|
|
def add(id):
|
|
count, size, csize = self.cache.chunks[id]
|
|
stats.update(size, csize, count == 1)
|
|
self.cache.chunks[id] = count - 1, size, csize
|
|
# This function is a bit evil since it abuses the cache to calculate
|
|
# the stats. The cache transaction must be rolled back afterwards
|
|
unpacker = msgpack.Unpacker(use_list=False)
|
|
cache.begin_txn()
|
|
stats = Statistics()
|
|
add(self.id)
|
|
for id, chunk in zip_longest(self.metadata[b'items'], self.repository.get_many(self.metadata[b'items'])):
|
|
add(id)
|
|
unpacker.feed(self.key.decrypt(id, chunk))
|
|
for item in unpacker:
|
|
try:
|
|
for id, size, csize in item[b'chunks']:
|
|
add(id)
|
|
stats.nfiles += 1
|
|
except KeyError:
|
|
pass
|
|
cache.rollback()
|
|
return stats
|
|
|
|
def extract_item(self, item, restore_attrs=True, peek=None):
|
|
dest = self.cwd
|
|
assert item[b'path'][:1] not in ('/', '\\', ':')
|
|
path = os.path.join(dest, item[b'path'])
|
|
# Attempt to remove existing files, ignore errors on failure
|
|
try:
|
|
st = os.lstat(path)
|
|
if stat.S_ISDIR(st.st_mode):
|
|
os.rmdir(path)
|
|
else:
|
|
os.unlink(path)
|
|
except OSError:
|
|
pass
|
|
mode = item[b'mode']
|
|
if stat.S_ISDIR(mode):
|
|
if not os.path.exists(path):
|
|
os.makedirs(path)
|
|
if restore_attrs:
|
|
self.restore_attrs(path, item)
|
|
elif stat.S_ISREG(mode):
|
|
if not os.path.exists(os.path.dirname(path)):
|
|
os.makedirs(os.path.dirname(path))
|
|
# Hard link?
|
|
if b'source' in item:
|
|
source = os.path.join(dest, item[b'source'])
|
|
if os.path.exists(path):
|
|
os.unlink(path)
|
|
os.link(source, path)
|
|
else:
|
|
with open(path, 'wb') as fd:
|
|
ids = [id for id, size, csize in item[b'chunks']]
|
|
for id, chunk in zip_longest(ids, self.repository.get_many(ids, peek)):
|
|
data = self.key.decrypt(id, chunk)
|
|
fd.write(data)
|
|
fd.flush()
|
|
self.restore_attrs(path, item, fd=fd.fileno())
|
|
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[b'source']
|
|
if os.path.exists(path):
|
|
os.unlink(path)
|
|
os.symlink(source, path)
|
|
self.restore_attrs(path, item, symlink=True)
|
|
elif stat.S_ISCHR(mode) or stat.S_ISBLK(mode):
|
|
os.mknod(path, item[b'mode'], item[b'rdev'])
|
|
self.restore_attrs(path, item)
|
|
else:
|
|
raise Exception('Unknown archive item type %r' % item[b'mode'])
|
|
|
|
def restore_attrs(self, path, item, symlink=False, fd=None):
|
|
xattrs = item.get(b'xattrs')
|
|
if xattrs:
|
|
for k, v in xattrs.items():
|
|
xattr.setxattr(fd or path, k, v)
|
|
uid = gid = None
|
|
if not self.numeric_owner:
|
|
uid = user2uid(item[b'user'])
|
|
gid = group2gid(item[b'group'])
|
|
uid = uid or item[b'uid']
|
|
gid = gid or item[b'gid']
|
|
# This code is a bit of a mess due to os specific differences
|
|
try:
|
|
if fd:
|
|
os.fchown(fd, uid, gid)
|
|
else:
|
|
os.lchown(path, uid, gid)
|
|
except OSError:
|
|
pass
|
|
if fd:
|
|
os.fchmod(fd, item[b'mode'])
|
|
elif not symlink:
|
|
os.chmod(path, item[b'mode'])
|
|
elif has_lchmod: # Not available on Linux
|
|
os.lchmod(path, item[b'mode'])
|
|
if fd and utime_supports_fd: # Python >= 3.3
|
|
os.utime(fd, None, ns=(item[b'mtime'], item[b'mtime']))
|
|
elif utime_supports_fd: # Python >= 3.3
|
|
os.utime(path, None, ns=(item[b'mtime'], item[b'mtime']), follow_symlinks=False)
|
|
elif not symlink:
|
|
os.utime(path, (item[b'mtime'] / 10**9, item[b'mtime'] / 10**9))
|
|
|
|
def verify_file(self, item, start, result, peek=None):
|
|
if not item[b'chunks']:
|
|
start(item)
|
|
result(item, True)
|
|
else:
|
|
start(item)
|
|
ids = [id for id, size, csize in item[b'chunks']]
|
|
try:
|
|
for id, chunk in zip_longest(ids, self.repository.get_many(ids, peek)):
|
|
self.key.decrypt(id, chunk)
|
|
except Exception:
|
|
result(item, False)
|
|
return
|
|
result(item, True)
|
|
|
|
def delete(self, cache):
|
|
unpacker = msgpack.Unpacker(use_list=False)
|
|
for id in self.metadata[b'items']:
|
|
unpacker.feed(self.key.decrypt(id, self.repository.get(id)))
|
|
for item in unpacker:
|
|
try:
|
|
for chunk_id, size, csize in item[b'chunks']:
|
|
self.cache.chunk_decref(chunk_id)
|
|
except KeyError:
|
|
pass
|
|
self.cache.chunk_decref(id)
|
|
self.cache.chunk_decref(self.id)
|
|
del self.manifest.archives[self.name]
|
|
self.manifest.write()
|
|
self.repository.commit()
|
|
cache.commit()
|
|
|
|
def stat_attrs(self, st, path):
|
|
item = {
|
|
b'mode': st.st_mode,
|
|
b'uid': st.st_uid, b'user': uid2user(st.st_uid),
|
|
b'gid': st.st_gid, b'group': gid2group(st.st_gid),
|
|
b'mtime': st_mtime_ns(st),
|
|
}
|
|
if self.numeric_owner:
|
|
item[b'user'] = item[b'group'] = None
|
|
try:
|
|
xattrs = xattr.get_all(path, follow_symlinks=False)
|
|
if xattrs:
|
|
item[b'xattrs'] = xattrs
|
|
except PermissionError:
|
|
pass
|
|
return item
|
|
|
|
def process_item(self, path, st):
|
|
item = {b'path': path.lstrip('/\\:')}
|
|
item.update(self.stat_attrs(st, path))
|
|
self.add_item(item)
|
|
|
|
def process_dev(self, path, st):
|
|
item = {b'path': path.lstrip('/\\:'), b'rdev': st.st_rdev}
|
|
item.update(self.stat_attrs(st, path))
|
|
self.add_item(item)
|
|
|
|
def process_symlink(self, path, st):
|
|
source = os.readlink(path)
|
|
item = {b'path': path.lstrip('/\\:'), b'source': source}
|
|
item.update(self.stat_attrs(st, path))
|
|
self.add_item(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:
|
|
item = self.stat_attrs(st, path)
|
|
item.update({b'path': safe_path, b'source': source})
|
|
self.add_item(item)
|
|
return
|
|
else:
|
|
self.hard_links[st.st_ino, st.st_dev] = safe_path
|
|
path_hash = self.key.id_hash(os.path.join(self.cwd, path).encode('utf-8', 'surrogateescape'))
|
|
ids = cache.file_known_and_unchanged(path_hash, st)
|
|
chunks = None
|
|
if ids is not None:
|
|
# Make sure all ids are available
|
|
for id in ids:
|
|
if not cache.seen_chunk(id):
|
|
break
|
|
else:
|
|
chunks = [cache.chunk_incref(id, self.stats) for id in ids]
|
|
# Only chunkify the file if needed
|
|
if chunks is None:
|
|
with open(path, 'rb') as fd:
|
|
chunks = []
|
|
for chunk in chunkify(fd, WINDOW_SIZE, CHUNK_MASK, CHUNK_MIN, self.key.chunk_seed):
|
|
chunks.append(cache.add_chunk(self.key.id_hash(chunk), chunk, self.stats))
|
|
ids = [id for id, _, _ in chunks]
|
|
cache.memorize_file(path_hash, st, ids)
|
|
item = {b'path': safe_path, b'chunks': chunks}
|
|
item.update(self.stat_attrs(st, path))
|
|
self.stats.nfiles += 1
|
|
self.add_item(item)
|
|
|
|
@staticmethod
|
|
def list_archives(repository, key, manifest, cache=None):
|
|
for name, info in manifest.archives.items():
|
|
yield Archive(repository, key, manifest, name, cache=cache)
|