[Bug 1417288] [NEW] unable to create snapshot

[ben thielsen]

Public bug reported:

the following occurs when attempting to create a snapshot:

virsh # snapshot-create-as template-generic 'test_snapshot' 'test snapshot' --disk-only --atomic
error: unsupported configuration: cannot generate external snapshot name for disk 'vda' without source

virsh # snapshot-create-as template-generic 'test_snapshot' 'test snapshot' --atomic
error: internal error: Child process (/usr/bin/qemu-img snapshot -c test_snapshot) unexpected exit status 1: qemu-img: Expecting one image file name
Try 'qemu-img --help' for more information

the guest is not running:
virsh # list --all
 Id    Name                           State
----------------------------------------------------
 -     template-generic           shut off

here is the guest xml:

virsh # dumpxml template-generic
<domain type='kvm'>
  <name>template-generic</name>
  <uuid>c2fcf78b-5919-45f6-af1f-cc540fa5f218</uuid>
  <description>generic template</description>
  <memory unit='KiB'>1048576</memory>
  <currentMemory unit='KiB'>1048576</currentMemory>
  <vcpu placement='static'>1</vcpu>
  <os>
    <type arch='x86_64' machine='pc-q35-2.1'>hvm</type>
    <boot dev='hd'/>
  </os>
  <features>
    <acpi/>
    <apic/>
  </features>
  <cpu mode='host-passthrough'>
  </cpu>
  <clock offset='utc'/>
  <on_poweroff>destroy</on_poweroff>
  <on_reboot>restart</on_reboot>
  <on_crash>destroy</on_crash>
  <devices>
    <emulator>/usr/bin/qemu-system-x86_64</emulator>
    <disk type='volume' device='disk'>
      <driver name='qemu' type='qcow2' cache='none'/>
      <source pool='disks-local' volume='template-generic.qcow2'/>
      <target dev='vda' bus='virtio'/>
      <address type='pci' domain='0x0000' bus='0x02' slot='0x03' function='0x0'/>
    </disk>
    <controller type='usb' index='0' model='ich9-ehci1'>
      <address type='pci' domain='0x0000' bus='0x02' slot='0x02' function='0x7'/>
    </controller>
    <controller type='usb' index='0' model='ich9-uhci1'>
      <master startport='0'/>
      <address type='pci' domain='0x0000' bus='0x02' slot='0x02' function='0x0' multifunction='on'/>
    </controller>
    <controller type='sata' index='0'>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x1f' function='0x2'/>
    </controller>
    <controller type='pci' index='0' model='pcie-root'/>
    <controller type='pci' index='1' model='dmi-to-pci-bridge'>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x1e' function='0x0'/>
    </controller>
    <controller type='pci' index='2' model='pci-bridge'>
      <address type='pci' domain='0x0000' bus='0x01' slot='0x01' function='0x0'/>
    </controller>
    <interface type='network'>
      <mac address='52:54:00:5c:51:ce'/>
      <source network='virtual-bridge' portgroup='it_net_admins'/>
      <model type='virtio'/>
      <driver name='vhost' txmode='iothread'/>
      <address type='pci' domain='0x0000' bus='0x02' slot='0x01' function='0x0'/>
    </interface>
    <input type='keyboard' bus='usb'/>
    <input type='tablet' bus='usb'/>
    <input type='mouse' bus='ps2'/>
    <input type='keyboard' bus='ps2'/>
    <graphics type='vnc' port='-1' autoport='yes' listen='0.0.0.0'>
      <listen type='address' address='0.0.0.0'/>
    </graphics>
    <video>
      <model type='qxl' ram='65536' vram='65536' heads='1'/>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x01' function='0x0'/>
    </video>
    <memballoon model='virtio'>
      <address type='pci' domain='0x0000' bus='0x02' slot='0x04' function='0x0'/>
    </memballoon>
  </devices>
</domain>

1] >lsb_release -rd
Description:	Ubuntu 14.10
Release:	14.10

2] >apt-cache policy libvirt-bin
libvirt-bin:
  Installed: 1.2.8-0ubuntu11.2
  Candidate: 1.2.8-0ubuntu11.2
  Version table:
 *** 1.2.8-0ubuntu11.2 0
        500 http://us.archive.ubuntu.com/ubuntu/ utopic-updates/main amd64 Packages
        100 /var/lib/dpkg/status
     1.2.8-0ubuntu11.1 0
        500 http://security.ubuntu.com/ubuntu/ utopic-security/main amd64 Packages
     1.2.8-0ubuntu11 0
        500 http://us.archive.ubuntu.com/ubuntu/ utopic/main amd64 Packages

3] i expected a snapshot to be created

4] the above errors

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

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https://bugs.launchpad.net/bugs/1417288

Title:
  unable to create snapshot

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