[Bug 1197754] [NEW] "lxc-start-ephemeral -d" is racy

[Robie Basak]

Public bug reported:

A script cannot call lxc-start-ephemeral and get a named container in a
reliable, race-free way.

Having the caller specify a name directly is racy, since the name could
have been taken in between checking that it doesn't exist already and
calling lxc-start-ephemeral.

Allowing lxc-start-ephemeral allows it to take care of the mkdir (and
retries) to generate an LXC container name in a race free manner, but
this needs -d to return the name in a machine-readable way, so that we
can create ephemeral LXC containers from scripts.

Please add a machine-readable mechanism to "lxc-start-ephemeral -d" and
then we can modify adt-virt-lxc to use it.

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

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

** Also affects: autopkgtest (Ubuntu)
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/1197754

Title:
  "lxc-start-ephemeral -d" is racy

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