def retrieve_snapshots(self):
""" Determine snapshot names. Snapshot names are sorted in reverse order (newest first).
stored internally (self.snapshot_names) and also returned. """
self._log_info('retrieving snapshots')
output = self.exec_check_output('btrfs sub list -o "%s"' %
self.container_subvolume_path)
# output is delivered as a byte sequence, decode to unicode string and split lines
lines = output.decode().splitlines()
subvolumes = list(map(lambda x: Subvolume.parse(x), lines))
# verify snapshot subvolume path consistency
if len(subvolumes) > 0:
subvol_path = os.path.dirname(subvolumes[0].path)
subvol_inconsistent_path = \
next((s.path for s in subvolumes if os.path.dirname(s.path) != subvol_path), None)
if subvol_inconsistent_path:
raise Exception(
'inconsistent path detected at %s [%s != %s], indicating a nested'
' folder/subvolume structure within a container subvolume.'
' each backup job must have a dedicated source/destination container subvolume'
% (self.url.path, subvol_path, subvol_inconsistent_path))
# sort and return
snapshots = []
for sv in subvolumes:
try:
snapshots.append(
Snapshot(SnapshotName.parse(os.path.basename(sv.path)),
sv))
except:
# skip snapshot names which cannot be parsed
pass
self.__snapshots = sorted(snapshots,
key=lambda s: s.name.timestamp,
reverse=True)
return self.__snapshots
def retrieve_snapshots(self):
""" Determine snapshot names. Snapshot names are sorted in reverse order (newest first).
stored internally (self.snapshot_names) and also returned. """
self._log_info('retrieving snapshots')
output = self.exec_check_output('btrfs sub list -o "%s"' % self.container_subvolume_path)
# output is delivered as a byte sequence, decode to unicode string and split lines
lines = output.decode().splitlines()
subvolumes = list(map(lambda x: Subvolume.parse(x), lines))
# verify snapshot subvolume path consistency
if len(subvolumes) > 0:
subvol_path = os.path.dirname(subvolumes[0].path)
subvol_inconsistent_path = \
next((s.path for s in subvolumes if os.path.dirname(s.path) != subvol_path), None)
if subvol_inconsistent_path:
raise Exception('inconsistent path detected at %s [%s != %s], indicating a nested'
' folder/subvolume structure within a container subvolume.'
' each backup job must have a dedicated source/destination container subvolume'
% (self.url.path, subvol_path, subvol_inconsistent_path))
# sort and return
snapshots = []
for sv in subvolumes:
try:
snapshots.append(Snapshot(SnapshotName.parse(os.path.basename(sv.path)), sv))
except:
# skip snapshot names which cannot be parsed
pass
self.__snapshots = sorted(snapshots, key=lambda s: s.name.timestamp, reverse=True)
return self.__snapshots
def test_instantiation(self):
print(SnapshotName.parse('sx-20150102-132010-utc'))
