[Bug 1776920] Re: qemu-img convert on Mac OSX creates corrupt images

[Juan Niño]

Hey there! I tested @wkozaczuk's suggested minimal steps and THEY WORKED
FOR ME!!

The steps executed on my mac:
1. dd if=boot.bin of=image.img > /dev/null 2>&1
2. dd if=lzloader.elf of=image.img conv=notrunc seek=128 > /dev/null 2>&1
3. qemu-img convert image.img -O qcow2 image.qemu
4. qemu-img convert image.qemu -O qcow2 image2.qemu

The end result:
-rw-r--r--  1 ***  ***  6684672 Jun 22 14:19 image.img
-rw-r--r--  1 ***  ***  7012352 Jun 22 14:20 image.qemu
-rw-r--r--  1 ***  ***  7012352 Jun 22 14:20 image2.qemu
-rw-r--r--  1 ***  ***  6750208 Jun 22 14:22 image2.vbox

The result of regular compare:
qemu-img compare image.qemu image2.qemu
Images are identical.

The result of strict compare:
qemu-img compare -s image.qemu image2.qemu
Images are identical.

Qemu-img on my Mac:
qemu-img --version
qemu-img version 6.0.0
Copyright (c) 2003-2021 Fabrice Bellard and the QEMU Project developers

Hardware Overview:

  Model Name:   MacBook Pro
  Model Identifier:     MacBookPro16,1
  Processor Name:       8-Core Intel Core i9
  Processor Speed:      2,4 GHz
  Number of Processors: 1
  Total Number of Cores:        8
  L2 Cache (per Core):  256 KB
  L3 Cache:     16 MB
  Hyper-Threading Technology:   Enabled
  Memory:       64 GB
  Activation Lock Status:       Enabled

Storage:

  Mount Point:  /
  File System:  APFS
  Writable:     No
  Ignore Ownership:     No
  BSD Name:     disk1s1
  Volume UUID:  67798918-C522-45C3-918F-3C4155EF4D13
  Physical Drive:
  Device Name:  APPLE SSD AP1024N
  Media Name:   AppleAPFSMedia
  Medium Type:  SSD
  Protocol:     PCI-Express
  Internal:     Yes
  Partition Map Type:   Unknown
  S.M.A.R.T. Status:    Verified

System Software Overview:

  System Version:       macOS 10.15.7 (19H1217)
  Kernel Version:       Darwin 19.6.0
  Boot Volume:  Macintosh HD
  Boot Mode:    Normal
  Secure Virtual Memory:        Enabled
  System Integrity Protection:  Enabled

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https://bugs.launchpad.net/bugs/1776920

Title:
  qemu-img convert on Mac OSX creates corrupt images

Status in QEMU:
  Expired

Bug description:
  An image created by qemu-img create, then modified by another program
  is converted to bad/corrupt image when using convert sub command on
  Mac OSX. The same convert works on Linux. The version of qemu-img is
  2.12.

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