> Sure, but there are plenty of other ways to accidentally mess up the
> permissions of a disk image file. A while back I had to strace qemu to
> figure out why file modifications were vanishing after rebooting the
> VM; the culprit turned out to be an unrelated script that had set the
> image file's mode to 444.

If you really want to do this, do it properly. Make it an error to use a ro 
image if the user [implicitly] requests rw access.

Paul


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