class MoveFSItemOperation(FSOperationBase):
"""Move a file or directory to the given name"""
__slots__ = ("_source_path", "_destination_path", "_actual_destination_path")
name = "FSItemMove"
def __init__(self, transaction, source_path, destination_path):
super(MoveFSItemOperation, self).__init__(transaction)
self._source_path = Path(source_path).expandvars()
self._destination_path = self._actual_destination_path = Path(destination_path).expandvars()
# if we move into a directory, the filename will just be appended
if self._destination_path.isdir():
self._actual_destination_path = self._destination_path / source_path.basename()
# END handle actual destination
def apply(self):
if self._actual_destination_path.exists():
raise AssertionError("Cannot move item %s onto existing one at %s" %
(self._source_path, self._actual_destination_path))
# END handle existing dsetination
if self._dry_run():
return
self.log.info("moving %s to %s", self._source_path, self._destination_path)
self._source_path.move(self._destination_path)
self._operation_performed = True
def rollback(self):
try:
if not self._operation_performed or not self._actual_destination_path.exists():
return
# fail gracefully
if self._source_path.exists():
raise AssertionError("Cannot move destination %s into existing source %s, source directory should not exist" % (
self._actual_destination_path, self._source_path))
self.log.info("moving %s to %s", self._actual_destination_path, self._source_path)
self._actual_destination_path.move(self._source_path)
finally:
self._reset_state()
# END assure state reset
#{ Interface
def actual_destination(self):
""":return: path to the final destination"""
return self._actual_destination_path
