[Libguestfs] [PATCH] v2v: Allow Windows virtio ISO to be a block device as well as a regular file.

[Richard W.M. Jones]

On Thu, Jul 04, 2019 at 03:52:20PM +0100, Richard W.M. Jones wrote:
> Thanks: Steven Rosenberg
> ---
>  v2v/windows_virtio.ml | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/v2v/windows_virtio.ml b/v2v/windows_virtio.ml
> index 59b0bf493..56c7a6757 100644
> --- a/v2v/windows_virtio.ml
> +++ b/v2v/windows_virtio.ml
> @@ -338,7 +338,7 @@ and copy_from_virtio_win g inspect srcdir destdir filter missing =
>        ) paths
>      )
>    )
> -  else if is_regular_file virtio_win then (
> +  else if is_regular_file virtio_win || is_block_device virtio_win then (
>      debug "windows: copy_from_virtio_win: guest tools source ISO %s" virtio_win;

I've now tested this patch.  Here's how.  (Note step (2) is the test).

Steven: You will need to include this information in your bug report
so that the QE team have a way to reproduce the problem.

(1)

VIRTIO_WIN=~/d/libguestfs/test-data/fake-virtio-win/fake-virtio-win.iso \
./run virt-v2v -vx -i disk test-data/phony-guests/windows.img -o null |&
  tee /tmp/log

Observe in /tmp/log that there is the following line:

windows: copy_from_virtio_win: guest tools source ISO /home/rjones/d/libguestfs/test-data/fake-virtio-win/fake-virtio-win.iso

This is expected because we're using a regular file.


(2)

Loopback mount the ISO:

$ sudo losetup /dev/loop0 `pwd`/fake-virtio-win.iso

$ ll /dev/loop0 
brw-rw----. 1 root disk 7, 0 Jul  4 16:01 /dev/loop0
$ sudo blockdev --getsize64 /dev/loop0 
2738176

Now run the same command as above but pointing to /dev/loop0, and
of course virt-v2v will now need to be run as root:

sudo VIRTIO_WIN=/dev/loop0 \
../run virt-v2v -vx -i disk test-data/phony-guests/windows.img -o null |&
  tee /tmp/log

To show that it used the block device:

$ grep copy_from_virtio_win /tmp/log
windows: copy_from_virtio_win: guest tools source ISO /dev/loop0

To clean up:

$ sudo losetup -d /dev/loop0


Rich.

-- 
Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones
Read my programming and virtualization blog: http://rwmj.wordpress.com
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