[Bug 914169] [NEW] lxc-start-ephemeral script does not support in-line programmatic commands to ephemeral containers

[Gary Poster]

Public bug reported:

William and Robert developed the lxc-start-ephemeral script to support a
use case that the version in the package no longer supports, to the best
of our knowledge.

Specifically, we need to be able to programmatically start ephemeral
instances, send them a command and get the results, and then shut down
the instance.  The packaged version instead starts an instance, directs
users to use lxc-console, and then starts lxc-monitor to wait for the
instance to close.

We may have missed a way to use the existing approach for what we need,
and are happy to talk about it.

If not, we believe that a nice solution would be to allow an option to
lxc-start-ephemeral for a command that, if provided, is run instead of
lxc-monitor.  This command would be able to have a placeholder string;
before the command is run, the placeholder would be replaced by the name
of the ephemeral container.  The command would inherit lxc-start-
ephemeral's stdout and stderr.  After the command finished, lxc-start-
ephemeral would proceed to shut off the instance, just as it does now
after lxc-monitor.

Thank you

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

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https://bugs.launchpad.net/bugs/914169

Title:
  lxc-start-ephemeral script does not support in-line programmatic
  commands to ephemeral containers

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