[Bug 1848556] Re: qemu-img check failing on remote image in Eoan

[Christian Ehrhardt ]

Hi Max,
libcurl 7.65.3-1ubuntu3 and was >7.59 for several releases (more than a year at 
least) - so there must be something else going on that this triggers now.

But never the less with the fix from [1] I can again get it to work
successfully.

I think I should backport that to our qemu 4.0 in Ubunutu.
It seems to apply fine (just offset -3, no fuzz)
The former seem not affected e.g. qemu 3.1 along libcurl 7.64.0-2ubuntu1 does 
not expose the behavior.

@Max - As the Author, just to check, do you see any issue backporting
that to qemu 4.0

[1]:
https://git.qemu.org/?p=qemu.git;a=commit;h=bfb23b480a49114315877aacf700b49453e0f9d9

** Also affects: qemu (Ubuntu Eoan)
   Importance: Undecided
       Status: New

** Also affects: qemu (Ubuntu Focal)
   Importance: Undecided
       Status: New

** Changed in: qemu (Ubuntu Focal)
       Status: New => Triaged

** Changed in: qemu (Ubuntu Eoan)
       Status: New => Triaged

** Changed in: qemu (Ubuntu Eoan)
   Importance: Undecided => Medium

** Changed in: qemu (Ubuntu Focal)
   Importance: Undecided => Medium

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https://bugs.launchpad.net/bugs/1848556

Title:
  qemu-img check failing on remote image in Eoan

Status in QEMU:
  Confirmed
Status in qemu package in Ubuntu:
  Triaged
Status in qemu source package in Eoan:
  Triaged
Status in qemu source package in Focal:
  Triaged

Bug description:
  The "qemu-img check" function is failing on remote (HTTP-hosted)
  images, beginning with Ubuntu 19.10 (qemu-utils version 1:4.0+dfsg-
  0ubuntu9). With previous versions, through Ubuntu 19.04/qemu-utils
  version 1:3.1+dfsg-2ubuntu3.5, the following worked:

  $ /usr/bin/qemu-img check  
http://10.193.37.117/cloud/eoan-server-cloudimg-amd64.img
  No errors were found on the image.
  19778/36032 = 54.89% allocated, 90.34% fragmented, 89.90% compressed clusters
  Image end offset: 514064384

  The 10.193.37.117 server holds an Apache server that hosts the cloud
  images on a LAN. Beginning with Ubuntu 19.10/qemu-utils 1:4.0+dfsg-
  0ubuntu9, the same command never returns. (I've left it for up to an
  hour with no change.) I'm able to wget the image from the same server
  and installation on which qemu-img check fails. I've tried several
  .img files on the server, ranging from Bionic to Eoan, with the same
  results with all of them.

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