disk.py script fails to detect openvz rootfs

1) The release of Ubuntu you are using, via 'lsb_release -rd' or System -> About Ubuntu
shinji@gateone:~$ lsb_release -rd
Description: Ubuntu 12.04.1 LTS
Release: 12.04

2) The version of the package you are using, via 'apt-cache policy pkgname' or by checking in Software Center
shinji@gateone:~$ apt-cache policy landscape-common
landscape-common:
  Installed: 12.05-0ubuntu0.12.04
  Candidate: 12.05-0ubuntu0.12.04
  Version table:
 *** 12.05-0ubuntu0.12.04 0
        500 http://us.archive.ubuntu.com/ubuntu/ precise-updates/main i386 Packages
        100 /var/lib/dpkg/status
     12.04.3-0ubuntu1 0
        500 http://us.archive.ubuntu.com/ubuntu/ precise/main i386 Packages

3) What you expected to happen
During login landscape-common should report the usage and total capacity of the rootfs.

4) What happened instead
It attempts to instead report the usage and free space of /home which is shown as unknown. (there is no /home mount)

5) Detailed information + patch
The OS is installed as an OpenVZ container. OpenVZ represents their filesystem as simfs rather than anything that is expected. /proc/mounts shows the rootfs as simfs. Adding simfs as a stable filesystem in disk.py resolves the issue.

This patch needs to be run in /usr/lib/python2.7/dist-packages/landscape/sysinfo in order to work. There is more than one disk.py file in landscape-common.

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: landscape-common 12.05-0ubuntu0.12.04 [modified: usr/share/pyshared/landscape/sysinfo/disk.py]
Uname: Linux 2.6.32-pony6-3 i686
ApportVersion: 2.0.1-0ubuntu14
Architecture: i386
Date: Mon Oct 22 22:41:33 2012
ProcEnviron:
 TERM=xterm-256color
 SHELL=/bin/bash
SourcePackage: landscape-client
UpgradeStatus: No upgrade log present (probably fresh install)