Libvirt errors with nested backeds QCOW2 images

[Javier Sánchez]

This is due by an error with Apparmor profile created for the new machine. Simple get a working qcow2 image like:

- Windows7-Base.img

Do a new qcow2 image using this as backing:

- qemu-img create -f qcow2 -b Windows7-Base.qcow2 Windows7-Updated.qcow2

Now just do some things on it like running updates and then do a new image like:

- qemu-img create -f qcow2 -b Windows7-Updated.qcow2 Final.qcow2

Now try to run a MV using Final.qcow2 and you will get an error:

- backing file: Could not open '/var/lib/libvirt/images/Windows7-Base.img': Permission denied

The problem is the Apparmor profile inside /etc/apparmor.d/libvirt/ , it's missing a read entry for '/var/lib/libvirt/images/Windows7-Base.img'

HACK:
Just add to a new device with Windows7-Base.img as "read-only" and libvirt will generate properly apparmor access to it.

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: virt-manager 0.9.5-1ubuntu3
ProcVersionSignature: Ubuntu 3.13.0-40.69-generic 3.13.11.10
Uname: Linux 3.13.0-40-generic x86_64
ApportVersion: 2.14.1-0ubuntu3.5
Architecture: amd64
CurrentDesktop: Unity
Date: Sat Nov 29 10:11:28 2014
ExecutablePath: /usr/share/virt-manager/virt-manager.py
InstallationDate: Installed on 2014-10-12 (47 days ago)
InstallationMedia: Ubuntu 14.04.1 LTS "Trusty Tahr" - Release amd64 (20140722.2)
InterpreterPath: /usr/bin/python2.7
PackageArchitecture: all
ProcEnviron:
 LANGUAGE=es
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=es_ES.UTF-8
 SHELL=/bin/bash
SourcePackage: virt-manager
UpgradeStatus: No upgrade log present (probably fresh install)

[Launchpad Janitor (janitor)]

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