def recreate_attr(self, regress_time):
"""
Make regress_time mirror_metadata snapshot by patching
We write to a tempfile first. Otherwise, in case of a crash, it
would seem we would have an intact snapshot and partial diff, not
the reverse.
"""
temprp = [self.data_dir.get_temp_rpath()]
def callback(rp):
temprp[0] = rp
writer = self._meta_main_class(temprp[0],
'wb',
check_path=0,
callback=callback)
for rorp in self._get_meta_main_at_time(regress_time, None):
writer.write_object(rorp)
writer.close()
finalrp = self.data_dir.append(b"mirror_metadata.%b.snapshot.gz" %
Time.timetobytes(regress_time))
assert not finalrp.lstat(), (
"Metadata path '{mrp}' shouldn't exist.".format(mrp=finalrp))
rpath.rename(temprp[0], finalrp)
if Globals.fsync_directories:
self.data_dir.fsync()
def _writer_helper(self, typestr, time, meta_class, force=False):
"""
Returns a writer class or None if the meta class isn't active.
For testing purposes, the force option allows to skip the activity
validation.
"""
if time is None:
timestr = Time.getcurtimestr()
else:
timestr = Time.timetobytes(time)
triple = map(os.fsencode, (meta_class.get_prefix(), timestr, typestr))
filename = b'.'.join(triple)
rp = self.data_dir.append(filename)
assert not rp.lstat(), "File '{rp}' shouldn't exist.".format(rp=rp)
assert rp.isincfile(), (
"Path '{irp}' must be an increment file.".format(irp=rp))
if meta_class.is_active() or force:
# Before API 201, metafiles couldn't be compressed
return meta_class(rp, 'w',
compress=(Globals.compression
or Globals.get_api_version() < 201),
callback=self._add_incrp)
else:
return None
def get_correct(self, mirror_rp, test_time):
"""Return correct version with base mirror_rp at time test_time"""
assert -1 < test_time < 2000000000, test_time
dirname, basename = mirror_rp.dirsplit()
for filename in restore_base_filenames:
comps = filename.split(b".")
base = b".".join(comps[:-1])
t = Time.bytestotime(comps[-1])
if t == test_time and basename == base:
return restore_base_rp.append(filename)
# Correct rp must be empty
return restore_base_rp.append(b"%b.%b" %
(basename, Time.timetobytes(test_time)))
