Hi,

qemu-nbd[1] is a way to "attach" qcow2 image to a nbd[2] device,
but we don't have nbd yet. Though Patrick made it working
for Bitrig[3]. Would it be usable in OpenBSD?

If qemu-nbd is not an option, what are other ways to get
data from various qemu-supported images (if not running qemu
itself and getting data over tcp/ip)?

I found vdfuse[4] but it would need VirtualBox libs working
on OpenBSD...

Jiri

[1] http://ask.xmodulo.com/mount-qcow2-disk-image-linux.html
[2] https://en.wikipedia.org/wiki/Network_block_device
  An example mounting OpenBSD partitions inside qcow2 on Linux:

  # qemu-nbd --connect=/dev/nbd0 /var/lib/libvirt/images/instsrv2.qcow2
  
  # fdisk -l /dev/nbd0
  Disk /dev/nbd0: 20 GiB, 21474836480 bytes, 41943040 sectors
  Units: sectors of 1 * 512 = 512 bytes
  Sector size (logical/physical): 512 bytes / 512 bytes
  I/O size (minimum/optimal): 512 bytes / 512 bytes
  Disklabel type: dos
  Disk identifier: 0x00000000
  
  Device      Boot Start      End  Sectors Size Id Type
  /dev/nbd0p4 *       64 41929649 41929586  20G a6 OpenBSD
  
  # dmesg | grep -A1 nbd0:
  [670102.643817]  nbd0: p4
                   p4: <openbsd: p5 p6 p7 p8 p9 p10 p11 p12 p13 >
  
  # mount -t ufs -o ufstype=44bsd /dev/nbd0p5 /mnt

[3] https://github.com/bitrig/bitrig/wiki/Roadmap
[4] https://github.com/SophosLabs/vdfuse

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