2dd07068a3
Combining --ephemeral with --grow-image= truncated the file passed to --image= to the requested size before the VM was started, so a mode whose entire purpose is to leave the original image untouched modified it on disk. Skip growing the original image when running ephemeral, and instead create the qcow2 overlay with the requested virtual size, so the guest sees the larger disk while the base image stays read-only. As only the overlay is sized in that case, the base image format no longer matters, so allow --grow-image= together with qcow2 images when running ephemeral. The round up to a multiple of 4096 moves to option parsing so both paths apply the same value. The vmspawn drive test grows an ephemeral VM and checks that the image passed to --image= keeps its size, and that the overlay QEMU runs off is created at the requested one.
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