New answers tagged libvirtd
Under evaluation, there is no support, but what you describe sounds like a bug. I would ask this question in the RHEV user groups at access.redhat.com, you will probably get response from support and engineering both.
I think you can do in this way: in /etc/libvirt/libvirtd.conf unix_sock_group = "libvirt" unix_sock_rw_perms = "0770" auth_unix_rw = "none" After that restart the libvirtd daemon
If you create the new image file in advance (e.g., using qemu-img create -f qcow2 -b <backing file> <new image name>) you could mount that drive as a loop device, then modify the files, unmount it and start the virtual machine. Mounting can be a little tricky at times since you have to skip past the partition table and the like. Probably easier ...
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