Virt-manager taking ownership of ISOs

[Nicolas Damgaard Larsen]

When installing a guest system from an ISO, virt-manager/libvirt takes ownership of the ISO. After install is done, the permissions are not restored.

$ ls -l Downloads/ubuntu-20.04.1-desktop-amd64.iso
-rw-rw-r-- 1 libvirt-qemu kvm 2785017856 Nov 1 10:28 Downloads/ubuntu-20.04.1-desktop-amd64.iso

$ lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 20.04.1 LTS
Release: 20.04
Codename: focal

$ apt-cache policy libvirt0
libvirt0:
  Installed: 6.0.0-0ubuntu8.4
  Candidate: 6.0.0-0ubuntu8.4
  Version table:
 *** 6.0.0-0ubuntu8.4 500
        500 http://dk.archive.ubuntu.com/ubuntu focal-updates/main amd64 Packages
        100 /var/lib/dpkg/status
     6.0.0-0ubuntu8.3 500
        500 http://security.ubuntu.com/ubuntu focal-security/main amd64 Packages
     6.0.0-0ubuntu8 500
        500 http://dk.archive.ubuntu.com/ubuntu focal/main amd64 Packages

$ apt-cache policy virt-manager
virt-manager:
  Installed: 1:2.2.1-3ubuntu2.1
  Candidate: 1:2.2.1-3ubuntu2.1
  Version table:
 *** 1:2.2.1-3ubuntu2.1 500
        500 http://dk.archive.ubuntu.com/ubuntu focal-updates/universe amd64 Packages
        500 http://dk.archive.ubuntu.com/ubuntu focal-updates/universe i386 Packages
        100 /var/lib/dpkg/status
     1:2.2.1-3ubuntu2 500
        500 http://dk.archive.ubuntu.com/ubuntu focal/universe amd64 Packages
        500 http://dk.archive.ubuntu.com/ubuntu focal/universe i386 Packages

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: virt-manager 1:2.2.1-3ubuntu2.1
ProcVersionSignature: Ubuntu 5.4.0-52.57-generic 5.4.65
Uname: Linux 5.4.0-52-generic x86_64
NonfreeKernelModules: nvidia_modeset nvidia
ApportVersion: 2.20.11-0ubuntu27.10
Architecture: amd64
CasperMD5CheckResult: skip
CurrentDesktop: ubuntu:GNOME
Date: Mon Nov 2 20:07:24 2020
InstallationDate: Installed on 2020-05-09 (177 days ago)
InstallationMedia: Ubuntu 20.04 LTS "Focal Fossa" - Release amd64 (20200423)
PackageArchitecture: all
SourcePackage: virt-manager
UpgradeStatus: No upgrade log present (probably fresh install)

[Christian Ehrhardt  (paelzer)]

Hi Nicolas,
I think I recognize that behavior and it should actually be fixed by this libvirt upload:
https://launchpad.net/ubuntu/+source/libvirt/6.0.0-0ubuntu8.2
See bug 691590 for more details on it.

You have that in place (...8.4 is reported) so I wonder what else might be missing for you.
The underlying FS has to be able to store xattr data, might I ask which filesystem it is that your ISO is on and if you might have any special options for xattr in your mount for it?

[Nicolas Damgaard Larsen (ndl101)]

Hi.

I appreciate your reply.
Yes, I am aware of https://bugs.launchpad.net/bugs/691590 which is why I am a little baffled as well. The ISO is located on my home partition. The filesystem was created by the ubuntu installer during a fresh 20.04 minimal install.

cat /etc/fstab | grep home
UUID=a03b8bb4-85f7-436e-afd2-8ab03b04bc66 /home ext4 defaults 0 2

mount | grep home
/dev/sdb2 on /home type ext4 (rw,relatime)

While I noticed that the package xattr is not installed. Should it be?.

apt-cache policy xattr
xattr:
  Installed: (none)
  Candidate: 0.9.6-1.1
  Version table:
     0.9.6-1.1 500
        500 http://dk.archive.ubuntu.com/ubuntu focal/universe amd64 Packages