[Bug 1212290] [NEW] update backing store defaults at lxc-create

[Serge Hallyn]

Public bug reported:

Make a few updates to how lxc-create chooses a backing store:

1. allow '-B btrfs,zfs,dir' to specify order of preference
2. allow '-B ANY' which chooses the best available - best being somewhat subjective.  Choices would be:
    1. if $lxcpath is btrfs, use btrfs with subvolume
    2. if a zfsroot called 'lxc' (or whatever is specified in /etc/lxc/lxc.conf) exists, use zfs
    3. if a lvm vg called 'lxc' (or whatever is specified in /etc/lxc/lxc.conf) exists, use lvm with default fstype/size
    4. use dir
3. It is yet to be decided whether when -B is not specified, and $lxcpath is btrfs, a btrfs subvolume should be created.

** Affects: lxc (Ubuntu)
     Importance: Low
     Assignee: Serge Hallyn (serge-hallyn)
         Status: Triaged

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https://bugs.launchpad.net/bugs/1212290

Title:
  update backing store defaults at lxc-create

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