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fix determination of newest mtime, fixes #1860

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bug:
if no files were added/modified, _newest_mtime stayed at its initial 0 value.
when saving the files cache, this killed all age 0 entries.

Now using None as initial value, so we can spot that circumstance.

The 2 ** 63 - 1 value is just so it is MAX_INT on a 64bit platform, for better performance.
It can be easily increased when y2262 is coming.
This commit is contained in:
Thomas Waldmann 2016-11-20 00:08:33 +01:00
parent ea6515d1aa
commit cabcbc5887
1 changed files with 5 additions and 2 deletions
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7
borg/cache.py
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@ -191,7 +191,7 @@ def close(self):
def _read_files(self):
self.files = {}
self._newest_mtime = 0
self._newest_mtime = None
logger.debug('Reading files cache ...')
with open(os.path.join(self.path, 'files'), 'rb') as fd:
u = msgpack.Unpacker(use_list=True)
@ -222,6 +222,9 @@ def commit(self):
if not self.txn_active:
return
if self.files is not None:
if self._newest_mtime is None:
# was never set because no files were modified/added
self._newest_mtime = 2 ** 63 - 1 # nanoseconds, good until y2262
ttl = int(os.environ.get('BORG_FILES_CACHE_TTL', 20))
with open(os.path.join(self.path, 'files'), 'wb') as fd:
for path_hash, item in self.files.items():
@ -451,4 +454,4 @@ def memorize_file(self, path_hash, st, ids):
# Entry: Age, inode, size, mtime, chunk ids
mtime_ns = st.st_mtime_ns
self.files[path_hash] = msgpack.packb((0, st.st_ino, st.st_size, int_to_bigint(mtime_ns), ids))
self._newest_mtime = max(self._newest_mtime, mtime_ns)
self._newest_mtime = max(self._newest_mtime or 0, mtime_ns)