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qemu-img rebase
This adds a rebase subcommand to qemu-img which allows to change the backingfile of an image.
In default mode, both the current and the new backing file need to exist, andafter the rebase, the COW image is guaranteed to have the same guest visible...
Documentation: Don't mention old qemu-img options
The old options are still supported for compatibility, but they areinconsistent (for example create -b vs. convert -B for backing files) andincomplete (-F only exists for create) which tends to confuse people. Remove...
Use hxtool for qemu-img command list
Use hxtool to generate the 'command syntax' section of qemu-img's helpmessage, and the corresponding section of the texinfo documentation.
This has the side-effect of adding 'check' to this list of commands inthe texinfo documentation....