[Bug 1317491] Re: virsh blockcommit hangs at 100%

[Rafael David Tinoco]

@cpaelzer, could u please review ? I think its all covered for the SRU.

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Title:
  virsh blockcommit hangs at 100%

Status in libvirt package in Ubuntu:
  Fix Released
Status in libvirt source package in Trusty:
  In Progress
Status in libvirt source package in Xenial:
  Fix Released
Status in libvirt source package in Yakkety:
  Fix Released
Status in libvirt source package in Zesty:
  Fix Released

Bug description:
  [Impact]

   * Virsh can't merge snapshots using the Block Commit technique
   * It is only possible to merge base to top image (not the opposite)
   * Combination of libvirt v1.2.2 and QEMU 2 is no good for Block Commit
   * After this fix, virsh won't hang on the opration, will cause an error

  [Test Case]

   * Workaround in Commit #10
   * QEMU is fine in Commit #11
   * Test Case in Commit #12

  [Regression Potential]

   * Block commit (Already broken) would continue not working
   * Its a small fix based on upstream fix (to block this function)

  [Other Info]
   
  ## Original Case Description

  virsh blockcommit hangs at 100% and nothing happens.

  I only found the following discussion:
  http://t358434.emulators-libvirt-user.emulatortalk.info/virsh-blockcommit-hangs-at-100-t358434.html

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