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[Serge Hallyn <1367730@xxxxxxxxxxxxxxxxxx>]

Thanks.  Meanwhile I've raised the issue on lxc-devel mailing list.

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https://bugs.launchpad.net/bugs/1367730

Title:
  container root directory has broken permissions with tight umask and
  --keep-data

Status in “lxc” package in Ubuntu:
  Confirmed

Bug description:
  While fixing autopkgtest for tight umasks
  (http://bugs.debian.org/761049) I noticed that LXC fails under tight
  umasks, too:

  $ sudo -i
  # umask 077
  # lxc-start-ephemeral --keep-data -o adt-utopic
  [... boots ... ]
  adt-utopic-9x0b7tw_ login: ubuntu
  Password:
  Welcome to Ubuntu Utopic Unicorn (development branch) (GNU/Linux 3.16.0-14-generic x86_64)

   * Documentation:  https://help.ubuntu.com/
  Unable to cd to '/home/ubuntu'

  then it fails and goes back to the login prompt. This is because of

  $ sudo lxc-attach -n adt-utopic-9x0b7tw_
  root@adt-utopic-9x0b7tw_:/# ls -ld /
  drwx------ 1 root root 4096 Sep 10 14:23 /

  apparently the container overlay root directory is created with the
  host umask, and thus any non-root process in the container can't
  execute anything due to / having 0700 permissions only.

  This is with LXC 1.1.0~alpha1-0ubuntu4 under current Utopic.

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