[Bug 925110] [NEW] lxc-ls fails as non-root sometimes (second bug)

[Scott Moser]

Public bug reported:

ubuntu at server-4390:~$ lxc-ls; echo $?
ubuntu-jstack-0-template               ubuntu-jstack-nova-compute-0
ubuntu-jstack-glance-0                 ubuntu-jstack-nova-volume-0
ubuntu-jstack-keystone-0               ubuntu-jstack-openstack-dashboard-0
ubuntu-jstack-mysql-0                  ubuntu-jstack-rabbitmq-0
ubuntu-jstack-nova-cloud-controller-0  ubuntu-source
/usr/bin/lxc-ls: line 35: cd: /sys/fs/cgroup/cpuset///lxc: Permission denied
ls: cannot access ubuntu-jstack-nova-volume-0: No such file or directory
ls: cannot access ubuntu-jstack-nova-cloud-controller-0: No such file or directory
ls: cannot access ubuntu-jstack-rabbitmq-0: No such file or directory
ls: cannot access ubuntu-jstack-keystone-0: No such file or directory
ls: cannot access ubuntu-jstack-openstack-dashboard-0: No such file or directory
ls: cannot access ubuntu-jstack-glance-0: No such file or directory
ls: cannot access ubuntu-jstack-nova-compute-0: No such file or directory
ls: cannot access ubuntu-jstack-mysql-0: No such file or directory
2
ubuntu at server-4390:~$ sudo lxc-ls; echo $?
ubuntu-jstack-0-template               ubuntu-jstack-nova-compute-0
ubuntu-jstack-glance-0                 ubuntu-jstack-nova-volume-0
ubuntu-jstack-keystone-0               ubuntu-jstack-openstack-dashboard-0
ubuntu-jstack-mysql-0                  ubuntu-jstack-rabbitmq-0
ubuntu-jstack-nova-cloud-controller-0  ubuntu-source
ubuntu-jstack-glance-0                 ubuntu-jstack-nova-compute-0
ubuntu-jstack-keystone-0               ubuntu-jstack-nova-volume-0
ubuntu-jstack-mysql-0                  ubuntu-jstack-openstack-dashboard-0
ubuntu-jstack-nova-cloud-controller-0  ubuntu-jstack-rabbitmq-0
0

2 things are causing this failure.
a.) 'mount -t cgroup' just seems to show nothing (no idea why)
b.) /sys/fs/cgroup/*/lxc are root only readable

$ ls -l /sys/fs/cgroup/cpuacct/ | egrep "(libvirt|lxc)"
drwxr-xr-x  4 root root 0 Feb  1 19:55 libvirt
drwx------ 10 root root 0 Feb  1 20:28 lxc

Things to fix:
 * need trailing / on 'ls -l' (in case its a symlink).
 * figure out why those directories are read-only

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: lxc 0.7.5-3ubuntu15
ProcVersionSignature: Ubuntu 3.2.0-12.20-generic 3.2.2
Uname: Linux 3.2.0-12-generic x86_64
ApportVersion: 1.91-0ubuntu1
Architecture: amd64
Date: Wed Feb  1 15:30:12 2012
EcryptfsInUse: Yes
InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Release amd64 (20111012)
ProcEnviron:
 PATH=(custom, user)
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: lxc
UpgradeStatus: Upgraded to precise on 2011-11-07 (86 days ago)

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


** Tags: amd64 apport-bug precise running-unity

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Title:
  lxc-ls fails as non-root sometimes (second bug)

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