--preserve-data dysfunctional

[Christoph Egger]

% virt-clone --preserve-data -o master -n node001 -f disk-node001.qcow2
ERROR cannot stat file '/var/lib/libvirt/images/disk-node001.qcow2': No such file or directory

% qemu-img create -f qcow2 -b disk-master.qcow2 disk-node001.qcow2
[...]

% virt-clone --preserve-data -o master -n node001 -f disk-node001.qcow2
ERROR Clone onto existing storage volume is not supported: '/var/lib/libvirt/images/disk-node001.qcow2'

Distributor ID: Ubuntu
Description: Ubuntu 12.04.1 LTS
Release: 12.04
Codename: precise

Note: I never expected the first to work, but I think the second virt-clone should

[Christoph Egger (christoph-egger)]

fwiw in CloneManager.py around 477 disabling the exception for the --preserve-data case and it works as expected

[MikeyB (supermathie)]

Specifically, add the following check:

                    if not self.preserve_dest_disks:
                        raise RuntimeError(
                            _("Clone onto existing storage volume is not "
                              "currently supported: '%s'") % clone_disk.path)

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Michael Speer (knomenet)]

I ran into the same problem. I found that calling virt-clone with --preserve-data before calling qemu-img works.

virt-clone succeeds since there is not yet a file there, and then you can put the storage into place after the fact.