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

[Robert Marklund]

Public bug reported:

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.

** Affects: qemu
     Importance: Undecided
         Status: New


** Tags: convert mac osx qcow2 qemu-img raw

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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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