Description of problem:
I tried to use virt-manager as a GUI front-end to creating a qcow2 file backed by an existing raw disk image. However, it appears the GUI is only willing to create a non-chained qcow2 image.
Version-Release number of selected component (if applicable):
Steps to Reproduce:
1. start virt-manager
2. under Edit,Host Details, select the Storage tab
3. Click New Volume
4. Change format to qcow2
5. Try to specify a backing file
No gui way to expose the <backingStore> xml element of <volume>
Ability to create a qcow2 file that uses another file as backing store (and optionally specify the expected format of that backing file) via the gui, since it would be a lot easier than writing the xml by hand and passing it through 'virsh create' on the command line
See also the recent libvirt patches to add 'vol-create-as --backing-vol xyz --backing-vol-format raw ...', which will make this task easier on the command line with virsh 0.8.2:
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Still relevant, moving to rawhide
Moving to upstream tracker
Upstream now, create vol wizard now has UI for specifying backing store