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files cache: improve exception handling, fixes #3553

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now deals with:
- corrupted files cache (truncated or modified not by borg)
- inaccessible/unreadable files cache
- missing files cache

The latter fix is not sufficient, the cache transaction processing
would still stumble over expected, but missing files in the cache.

(cherry picked from commit 423ec4ba1e)
This commit is contained in:
Thomas Waldmann 2018-01-20 06:36:54 +01:00
parent 208ff77ddd
commit 2493598eef
1 changed files with 26 additions and 19 deletions
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45
src/borg/cache.py
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@ -502,25 +502,32 @@ class LocalCache(CacheStatsMixin):
self.files = {}
self._newest_cmtime = None
logger.debug('Reading files cache ...')
with IntegrityCheckedFile(path=os.path.join(self.path, 'files'), write=False,
integrity_data=self.cache_config.integrity.get('files')) as fd:
u = msgpack.Unpacker(use_list=True)
while True:
data = fd.read(64 * 1024)
if not data:
break
u.feed(data)
try:
for path_hash, item in u:
entry = FileCacheEntry(*item)
# in the end, this takes about 240 Bytes per file
self.files[path_hash] = msgpack.packb(entry._replace(age=entry.age + 1))
except (TypeError, ValueError) as exc:
logger.warning('The files cache seems corrupt, ignoring it. '
'Expect lower performance. [%s]' % str(exc))
self.files = {}
return
msg = None
try:
with IntegrityCheckedFile(path=os.path.join(self.path, 'files'), write=False,
integrity_data=self.cache_config.integrity.get('files')) as fd:
u = msgpack.Unpacker(use_list=True)
while True:
data = fd.read(64 * 1024)
if not data:
break
u.feed(data)
try:
for path_hash, item in u:
entry = FileCacheEntry(*item)
# in the end, this takes about 240 Bytes per file
self.files[path_hash] = msgpack.packb(entry._replace(age=entry.age + 1))
except (TypeError, ValueError) as exc:
msg = "The files cache seems invalid. [%s]" % str(exc)
break
except OSError as exc:
msg = "The files cache can't be read. [%s]" % str(exc)
except FileIntegrityError as fie:
msg = "The files cache is corrupted. [%s]" % str(fie)
if msg is not None:
logger.warning(msg)
logger.warning('Continuing without files cache - expect lower performance.')
self.files = {}
def begin_txn(self):
# Initialize transaction snapshot