[Bug 1403841] [NEW] libvirt snapshot does not save source in xml

[krypton]

Public bug reported:

Ubuntu 14.04.1 tls trusty

Using library: libvirt 1.2.2
Using API: QEMU 1.2.2
Running hypervisor: QEMU 2.0.0


When you create a snapshot through "virsh snapshot-create-as" when a virtual machine is on,
then the source tag in the xml is changed.

But when you reboot the HOST, then the changes in the source tag are
discared (the old/previous source path is used again).

I'v reproduced this bug on a clean Ubuntu 14.04 Trusty with fully updated packages.
Could not reproduce this on a 12.04 tls, so only 14.04 is affected (with libvirt version 1.2.2)

Reproduce:

- Create VM  => vm.qcow2
- Create snashot (through snasphot-create-as) => snapshot.qcow2
- reboot the host
- now the old source path is used again  => vm.qcow2

** Affects: libvirt (Ubuntu)
     Importance: Undecided
         Status: New

** Description changed:

+ Ubuntu 14.04.1 tls trusty
+ 
+ Using library: libvirt 1.2.2
+ Using API: QEMU 1.2.2
+ Running hypervisor: QEMU 2.0.0
+ 
+ 
  When you create a snapshot through "virsh snapshot-create-as" when a virtual machine is on,
  then the source tag in the xml is changed.
  
  But when you reboot the HOST, then the changes in the source tag are
  discared (the old/previous source path is used again).
  
  I'v reproduced this bug on a clean Ubuntu 14.04 Trusty with fully updated packages.
  Could not reproduce this on a 12.04 tls, so only 14.04 is affected (with libvirt version 1.2.2)
  
  Reproduce:
  
  - Create VM  => vm.qcow2
  - Create snashot (through snasphot-create-as) => snapshot.qcow2
  - reboot the host
  - now the old source path is used again  => vm.qcow2

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https://bugs.launchpad.net/bugs/1403841

Title:
  libvirt snapshot does not save source in xml

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