No option to close a Target

[Kafow]

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 https://github.com/fox-it/dissect.target/blob/d1fcfe4428136c9c08f5104eb79e9df57341c632/dissect/target/containers/qcow2.py#L10-L17 As you can see we are opening a file handle to the path specified: https://github.com/fox-it/dissect.target/blob/d1fcfe4428136c9c08f5104eb79e9df57341c632/dissect/target/containers/qcow2.py#L14

  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: https://github.com/fox-it/dissect.target/blob/d1fcfe4428136c9c08f5104eb79e9df57341c632/dissect/target/containers/qcow2.py#L39-L40 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

[Schamper]

Hi @Kafow! That is indeed correct and something we wish to clean up. It hasn't been an issue for us so far because most of our use-cases for dissect.target are fairly short-lived programs, so dangling file handles weren't an issue (they'd be cleaned up as the program exits).

If you could create a PR with a start for fixing this, that'd be appreciated!