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Also add a volatile? argument to the virtual-machine record. When volatile? is true generate a QEMU script that mounts an overlay on top of a read only storage. When volatile? is false, use a persistent, read-write storage. * gnu/system/vm.scm (common-qemu-options): Add a rw-image? argument to use a persistent storage. (system-qemu-image/shared-store-script): Add a volatile? argument and honor it. Use the image API to build the QEMU image. (<virtual-machine>)[volatile?]: New field. (virtual-machine-compiler): Pass the volatile? argument to the system-qemu-image/shared-store-script procedure.