[Bug 1888467] Re: qemu-img http convert bug

[dunfeng zhang]

first, what I said "file size" is file length as reported by ls
-l?field.comment=first, what I said "file size" is file length as
reported by ls -l.

The following attachment shows the size of the same source file after
different conversion methods，

http -> local: qemu-img convert -f raw -O vdi localfile localfile1
local -> local: qemu-img convert -f raw -O vdi localfile localfile2
localfile1's size is different from localfile2

secondly, the conversion of qcow2 and vmdk is normal.
http -> local: qemu-img convert -f raw -O qcow2 localfile localfile1
local -> local: qemu-img convert -f raw -O qcow2 localfile localfile2
localfile1's size is the same size as localfile2

** Attachment added: "B3DA75B6-00A2-4C4B-B0D2-6F57E92573BD.png"
   
https://bugs.launchpad.net/qemu/+bug/1888467/+attachment/5394838/+files/B3DA75B6-00A2-4C4B-B0D2-6F57E92573BD.png

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https://bugs.launchpad.net/bugs/1888467

Title:
  qemu-img http convert bug

Status in QEMU:
  New

Bug description:
  Hello, Why the file sizes of http conversion and local conversion are
  inconsistent?

  Use the http method of qemu-img for conversion. The size of some formats 
after conversion is different from the local method of qemu-img. Such as vhd, 
vdi. qcow2 and vmdk are normal。
  My image size is 40 G, raw format.

  The source is the same file, but the access method is different
  http method of qemu-img： qemu-img convert -f raw -O vdi http://xxx 
xxx.vdi（19G，after conversion）
  local method of qemu-img： qemu-img convert -f raw -O vdi xxx.raw 
xxx.vdi（3G，after conversion）

  thank you

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