Hey,
When opening a target there is no option to close its resources that have opened on the filesystem.
For example, consider opening A qcow2 target:

• In order to open a qcow2 target we will initialize qcow2container
  

  dissect.target/dissect/target/containers/qcow2.py

  Lines 10 to 17 in d1fcfe4

  	class QCow2Container(Container):
  	def __init__(self, fh: Union[BinaryIO, Path], data_file=None, backing_file=None, *args, **kwargs):
  	f = fh
  	if not hasattr(fh, "read"):
  	f = fh.open("rb")
  	self.qcow2 = qcow2.QCow2(f, data_file, backing_file)
  	super().__init__(fh, self.qcow2.size, *args, **kwargs)

  
  As you can see we are opening a file handle to the path specified:
  

  dissect.target/dissect/target/containers/qcow2.py

  Line 14 in d1fcfe4

  f = fh.open("rb")

  However, consider we wanna free that target, we will try to call something like

  for disk in target.disks:
      disk.close()

  But as it seems, the close function is not implemented in most of the containers, for example Qcow2Container:
  

  dissect.target/dissect/target/containers/qcow2.py

  Lines 39 to 40 in d1fcfe4

  	def close(self) -> None:
  	pass

  
  So the only way to close a file handle right now is to do some workaround like this (considering you have different types of disks):

  for disk in target.disks:
      if hasattr(disk, "qcow2"):
          disk.qcow2.fh.close()
      if hasattr(disk, "vhdx"):
          disk.vhdx.fh.close()
      
      .....

  Instead of just doing a way cleaner code like:

  for disk in target.disks:
      disk.close()

  I might try and do a PR later fixing this issue.
  Thanks,
  Ofek