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Background ---------- A complaint I'm hearing is that some tools which take a long time to run (virt-resize in particular) need to have progress bars to indicate how long they are expected to run. This is also a basic usability principle, see for example this paper: http://www.chrisharrison.net/projects/progressbars/ProgBarHarrison.pdf If you look at how virt-resize is implemented, the bulk of the time is spent copying partitions in a single long-running function, copy_size: http://libguestfs.org/guestfs.3.html#guestfs_copy_size The current protocol is entirely synchronous so tha...