[Qemu-devel] [Bug 1655764] [NEW] qemu-img convert -c compression can't decompress

[Qemu-devel] [Bug 1655764] [NEW] qemu-img convert -c compression can't decompress

[Jignasha]

Public bug reported:

Used -c compression option of qemu-img convert to compress qcow2,
then libvirt mount for compressed image don't work as well as decompression also
not working, tried glib-deflate to decompress

** Affects: qemu
     Importance: Undecided
         Status: New

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Title:
  qemu-img convert -c compression can't decompress

Status in QEMU:
  New

Bug description:
  Used -c compression option of qemu-img convert to compress qcow2,
  then libvirt mount for compressed image don't work as well as decompression also
  not working, tried glib-deflate to decompress

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[Qemu-devel] [Bug 1655764] Re: qemu-img convert -c compression can't decompress

[Jignasha]

Used openssl zlib -d < compressedfile but that also not working

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Title:
  qemu-img convert -c compression can't decompress

Status in QEMU:
  New

Bug description:
  Used -c compression option of qemu-img convert to compress qcow2,
  then libvirt mount for compressed image don't work as well as decompression also
  not working, tried glib-deflate to decompress

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[Qemu-devel] [Bug 1655764] Re: qemu-img convert -c compression can't decompress

[Jignasha]

When tried zlib-flate -uncompress < cirros-0.3.4-x86_64-disk.img,
getting below error

data: incorrect header check

** Description changed:

  Used -c compression option of qemu-img convert to compress qcow2,
  then libvirt mount for compressed image don't work as well as decompression also
- not working, tried glib-deflate to decompress
+ not working, tried zlib-flate to decompress

** Information type changed from Public to Public Security

** Information type changed from Public Security to Private Security

** Information type changed from Private Security to Private

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Title:
  qemu-img convert -c compression can't decompress

Status in QEMU:
  New

Bug description:
  Used -c compression option of qemu-img convert to compress qcow2,
  then libvirt mount for compressed image don't work as well as decompression also
  not working, tried zlib-flate to decompress

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Re: [Qemu-devel] [Bug 1655764] Re: qemu-img convert -c compression can't decompress

[Stefan Hajnoczi]

[-- Attachment #1: Type: text/plain, Size: 426 bytes --]

On Wed, Jan 11, 2017 at 09:58:35PM -0000, Jignasha wrote:
> When tried zlib-flate -uncompress < cirros-0.3.4-x86_64-disk.img,
> getting below error
> 
> data: incorrect header check

QEMU image compression uses the compression feature available in some
disk image formats (like qcow2).  This is not the same as compressing a
file with gzip, bzip2, or similar tools.

Therefore this error is expected and not a bug.

[-- Attachment #2: signature.asc --]
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[Qemu-devel] [Bug 1655764] Re: qemu-img convert -c compression can't decompress

[Thomas Huth]

Which version of QEMU (or rather qemu-img) are you using?

** Information type changed from Private to Public

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Title:
  qemu-img convert -c compression can't decompress

Status in QEMU:
  New

Bug description:
  Used -c compression option of qemu-img convert to compress qcow2,
  then libvirt mount for compressed image don't work as well as decompression also
  not working, tried zlib-flate to decompress

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[Qemu-devel] [Bug 1655764] Re: qemu-img convert -c compression can't decompress

[Jignasha]

qemu-img version 2.1.2, Copyright (c) 2004-2008 Fabrice Bellard

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Title:
  qemu-img convert -c compression can't decompress

Status in QEMU:
  Invalid

Bug description:
  Used -c compression option of qemu-img convert to compress qcow2,
  then libvirt mount for compressed image don't work as well as decompression also
  not working, tried zlib-flate to decompress

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[Qemu-devel] [Bug 1655764] Re: qemu-img convert -c compression can't decompress

[Thomas Huth]

When reporting bugs, please always use the latest version of QEMU, old
versions like 2.1 are not supported anymore. I just also noticed that
Stefan Hajnoczi replied to the bug mail on the qemu-devel mailing list
(see https://www.mail-archive.com/qemu-devel@nongnu.org/msg422186.html)
- seems like the bridge did not mirror this to the bug tracker:

"QEMU image compression uses the compression feature available in some
 disk image formats (like qcow2).  This is not the same as compressing a
 file with gzip, bzip2, or similar tools.
 Therefore this error is expected and not a bug."

** Changed in: qemu
       Status: New => Invalid

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Title:
  qemu-img convert -c compression can't decompress

Status in QEMU:
  Invalid

Bug description:
  Used -c compression option of qemu-img convert to compress qcow2,
  then libvirt mount for compressed image don't work as well as decompression also
  not working, tried zlib-flate to decompress

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[Qemu-devel] [Bug 1655764] Re: qemu-img convert -c compression can't decompress

[Jignasha]

Yes used qcow2 format only when compressing, I don't think due to older
version problem

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https://bugs.launchpad.net/bugs/1655764

Title:
  qemu-img convert -c compression can't decompress

Status in QEMU:
  Invalid

Bug description:
  Used -c compression option of qemu-img convert to compress qcow2,
  then libvirt mount for compressed image don't work as well as decompression also
  not working, tried zlib-flate to decompress

To manage notifications about this bug go to:
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[Qemu-devel] [Bug 1655764] Re: qemu-img convert -c compression can't decompress

[Jignasha]

When converting qcow2 with -c option, then after not able to boot VM
with compressed qcow2 image

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https://bugs.launchpad.net/bugs/1655764

Title:
  qemu-img convert -c compression can't decompress

Status in QEMU:
  Invalid

Bug description:
  Used -c compression option of qemu-img convert to compress qcow2,
  then libvirt mount for compressed image don't work as well as decompression also
  not working, tried zlib-flate to decompress

To manage notifications about this bug go to:
https://bugs.launchpad.net/qemu/+bug/1655764/+subscriptions