[Qemu-devel] [Bug 1738840] Re: qemu-img convert qcow2 to raw fails on OS X

[John Snow]

We've had APFS bugs before, if memory serves... perhaps something to do
with sparse gap handling?

Do you have the ability to take a "good" conversion of the qcow2 file
(made on a non-APFS partition) and compare it against the "bad"
conversion?

Highlighting the differences might inspire some ideas as to where this
has gone wrong, but at present I don't have an OSX computer to test this
with, personally.

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https://bugs.launchpad.net/bugs/1738840

Title:
  qemu-img convert qcow2 to raw fails on OS X

Status in QEMU:
  New

Bug description:
  I try to convert a image from qcow2 to raw and the result is a not bootable 
image.
  I dont know if it is a bug in qemu-img convert or with the image it self.

  See this error report for better readability:
  https://github.com/coreos/bugs/issues/1121#issuecomment-351968518

  As a reply here they use 2.9.0 version of

  
  $ qemu-img -V
  qemu-img version 2.11.0
  Copyright (c) 2003-2017 Fabrice Bellard and the QEMU Project developers

  $ uname -v
  Darwin Kernel Version 17.2.0

  $ mount ./
  /dev/disk1s1 on / (apfs, local, journaled)

  $  wget https://beta.release.core-
  os.net/amd64-usr/current/coreos_production_openstack_image.img.bz2

  $ date
  Fri Dec 14 17:15:57 CET 2017

  $ bunzip2 coreos_production_openstack_image.img.bz2

  
  $ cp -a coreos_production_openstack_image.img.org 
coreos_production_openstack_image.img

  $ shasum coreos_production_openstack_image.img.org
  ae2119c6f0390dc36f247f7016923ea85de5d8e6  
coreos_production_openstack_image.img.org

  $ qemu-img convert -f qcow2 -O raw
  coreos_production_openstack_image.img.org
  coreos_production_openstack_image.bin

  $ qemu-system-x86_64 -m 256 -nographic -hda 
coreos_production_openstack_image.img -boot c
  SeaBIOS (version rel-1.11.0-0-g63451fca13-prebuilt.qemu-project.org)

  
  iPXE (http://ipxe.org) 00:03.0 C980 PCI2.10 PnP PMM+0FF915A0+0FEF15A0 C980
                                                                                
 

  
  Booting from Hard Disk...
  GRUB loading....
  Welcome to GRUB!
  ....

  $ qemu-system-x86_64 -m 256 -nographic -hda
  coreos_production_openstack_image.bin -boot c

  SeaBIOS (version rel-1.11.0-0-g63451fca13-prebuilt.qemu-project.org)

  
  iPXE (http://ipxe.org) 00:03.0 C980 PCI2.10 PnP PMM+0FF915A0+0FEF15A0 C980
                                                                                
 

  
  Booting from Hard Disk...
  Boot failed: not a bootable disk
  ....

  
  $ head -c 8192 coreos_production_openstack_image.bin | hexdump -C
  00000000  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
  *
  00002000

  $ qemu-img info coreos_production_openstack_image.bin
  image: coreos_production_openstack_image.bin
  file format: raw
  virtual size: 8.5G (9116319744 bytes)
  disk size: 217M

  $ qemu-img info coreos_production_openstack_image.img
  image: coreos_production_openstack_image.img
  file format: qcow2
  virtual size: 8.5G (9116319744 bytes)
  disk size: 785M
  cluster_size: 65536
  Format specific information:
      compat: 0.10
      refcount bits: 16

  The same version works on Ubuntu so it looks like its only the Mac
  version or the new APFS filesystem.

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