[Bug 1188501] Re: lxc-execute fails to start container without rootfs

[Serge Hallyn]

** Description changed:

+ ========================
+ Impact: cannot lxc-execute in a container without private rootfs
+ Development fix: mount /proc when no rootfs is specified
+ Stable fix: same as development fix
+ Test case:
+ 	sudo lxc-execute --name test /bin/bash
+ 	Without the fix, this will fail.  With the fix, it will
+ 	succeed.
+ Regression potential: This fix is cherrypicked from upstream, and
+ 	should not result in any regressions.  The function
+ 	being modified is a crucial one though.
+ ========================
+ 
  I get the following output when trying to start a container just running
  bash as an app:
  
  $ sudo lxc-execute --name test /bin/bash 
  lxc-execute: Permission denied - failed to change apparmor profile to lxc-container-default
  lxc-execute: invalid sequence number 1. expected 4
  lxc-execute: failed to spawn 'test'
  
  
  I'm attaching the contents of /var/log/lxc/test.log, which is the only log file I can see.
  
  ProblemType: Bug
  DistroRelease: Ubuntu 13.04
  Package: lxc 0.9.0-0ubuntu3.2
  ProcVersionSignature: Ubuntu 3.8.0-23.34-generic 3.8.11
  Uname: Linux 3.8.0-23-generic x86_64
  NonfreeKernelModules: nvidia
  ApportVersion: 2.9.2-0ubuntu8.1
  Architecture: amd64
  Date: Fri Jun  7 08:09:18 2013
  EcryptfsInUse: Yes
  InstallationDate: Installed on 2012-04-27 (405 days ago)
  InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Beta amd64 (20120328)
  MarkForUpload: True
  SourcePackage: lxc
  UpgradeStatus: Upgraded to raring on 2013-04-26 (41 days ago)
  lxcsyslog:

** Changed in: lxc (Ubuntu Raring)
       Status: Confirmed => In Progress

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https://bugs.launchpad.net/bugs/1188501

Title:
  lxc-execute fails to start container without rootfs

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