Hi Robie,
about:
"Since we're changing behaviour I'm also concerned that this is high risk of 
regression for some use case we haven't considered where the previous behaviour 
is being depended upon. Thoughts on how to mitigate this would be appreciated. 
I appreciate that Christian has already come up with and tested a variety of 
use cases here - how comprehensive do you think these are when compared to 
"weird" things users might be doing?"

Answer: the current workaround would server there as well, one can tweak in 
file /etc/libvirt/qemu.conf
  # Whether libvirt should dynamically change file ownership
  # to match the configured user/group above. Defaults to 1.
  # Set to 0 to disable file ownership changes.
  #dynamic_ownership = 1

Currently this is enabled, changing the file to the runtime perms needed and 
then back (the bug) to root.
If you just chown the files to root and disable this feature it will match the 
former behavior (which now restores the proper former owner).

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https://bugs.launchpad.net/bugs/691590

Title:
  libvirt restore exactly the old ownership of images

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