[Qemu-devel] [Bug 1811711] Re: qemu-img can not convert virtualbox virtual disk formats qcow

[Daniel Berrange]

This bug was related to an IRC discussion on Jan 14th but this bug
description is not showing the problem that was raised on IRC. The IRC
discussion showed a source image with a 9GB Windows 10 installation,
turning into an image with only 8 MB of data present.  The images in
this bug description don't have any data written so are not illustrating
the data conversion issue.

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https://bugs.launchpad.net/bugs/1811711

Title:
  qemu-img can not convert virtualbox virtual disk formats qcow

Status in QEMU:
  New

Bug description:
  Hello, I'm working with QEMU on macOS, and am experiencing issues
  working with the `qemu-img` command.

  Info
  ----
  $ sw_vers
  ProductName:    Mac OS X
  ProductVersion: 10.13.6
  BuildVersion:   17G4015

  VirtualBox
  ----------
  $ VBoxManage --version
  6.0.0r127566

  $ qemu-system-x86_64 --version
  QEMU emulator version 3.1.50 (v3.1.0-rc2-745-g147923b1a9-dirty)
  Copyright (c) 2003-2018 Fabrice Bellard and the QEMU Project developers

  $ qemu-img --version
  qemu-img version 3.1.50 (v3.1.0-rc2-745-g147923b1a9-dirty)
  Copyright (c) 2003-2018 Fabrice Bellard and the QEMU Project developers

  Steps to reproduce
  ------------------

  > Prereq VirtualBox needs to be installed to run the `VBoxManage`
  command

  $ VBoxManage createmedium disk --filename vbox-vdisk-exp.qcow --format qcow 
--size 5
  0%...10%...20%...30%...40%...50%...60%...70%...80%...90%...100%
  Medium created. UUID: e2b36955-3791-4c0e-93d4-913669b1d9fb

  $ file vbox-vdisk-exp.qcow
  vbox-vdisk-exp.qcow: QEMU QCOW Image (v1), 5242880 bytes

  $ qemu-img info vbox-vdisk-exp.qcow
  image: vbox-vdisk-exp.qcow
  file format: qcow
  virtual size: 5.0M (5242880 bytes)
  disk size: 8.0K
  cluster_size: 4096

  # Convert vbox virtualdisk to qcow2 format using `qemu-img`
  $ qemu-img convert -f qcow vbox-vdisk-exp.qcow -O qcow2 
vbox-vdisk-exp-convert.qcow2

  $ file vbox-vdisk-exp-convert.qcow2
  vbox-vdisk-exp-convert.qcow2: QEMU QCOW Image (v3), 5242880 bytes

  # Print info about qemu-img converted image from vbox created qcow image
  $ qemu-img info vbox-vdisk-exp-convert.qcow2                                  
                 mutts-6 | 0 < 10:53:00
  image: vbox-vdisk-exp-convert.qcow2
  file format: qcow2
  virtual size: 5.0M (5242880 bytes)
  disk size: 196K
  cluster_size: 65536
  Format specific information:
      compat: 1.1
      lazy refcounts: false
      refcount bits: 16
      corrupt: false

  # Print info about vbox created qcow image
  qemu-img info vbox-vdisk-exp.qcow                                             
               mutts-6 | 0 < 10:53:19
  image: vbox-vdisk-exp.qcow
  file format: qcow
  virtual size: 5.0M (5242880 bytes)
  disk size: 8.0K
  cluster_size: 4096

  I've attached a zip file containing the vbox created qcow image along
  with the image that `qemu-img` converted.

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