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

[ChristianEhrhardt]

There was a short "WTF" moment as it seems https://launchpad.net/ubuntu/+source/libvirt/1.2.2-0ubuntu13.1.18 existed.
But it was only in proposed and got removed from there by inactivity to test the case.
There is also https://launchpad.net/ubuntu/+source/libvirt/1.2.2-0ubuntu13.1.19 which faced the same fate.
But well, that "only" means we have to make this .20 - since the others never got released (and so their content) they shall not be part of the changelog.

Ok, it is in the unapproved queue now.

@SRU Team:
I asked on ubuntu-devel but got no resonse, since .18 and .19 never existed for the users I skipped them in the changelog intentionally - please let me know if that should be handled otherwise (like keeping all old entries, and adding mass revert statements).

@Tinoco:
I also want to verify a few more things by testing once it is in proposed, so please document once you think you are fine testing the case (and the extra variants I asked for above) in proposed.
But please wait setting v-done before I also had time to complete my tests.

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https://bugs.launchpad.net/bugs/1317491

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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