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[Thierry Carrez <thierry.carrez+lp@xxxxxxxxx>]

** Changed in: nova
       Status: Fix Committed => Fix Released

** Changed in: nova
    Milestone: None => kilo-1

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https://bugs.launchpad.net/bugs/1279857

Title:
  RFE: libguestfs logging should be connected up to openstack logging

Status in OpenStack Compute (Nova):
  Fix Released

Bug description:
  https://bugzilla.redhat.com/show_bug.cgi?id=1064948

  We were trying to chase up a bug in libguestfs integration with
  OpenStack.  It was made much harder because the only way to diagnose
  the bug was to manually run the nova service after manually setting
  environment variables:
  http://libguestfs.org/guestfs-faq.1.html#debugging-libguestfs

  It would be much nicer if:

  (1) There was a Nova setting to enable debugging, like:
        libguestfs_debug = 1
  or something along those lines.

  (2) Nova used the events API to collect libguestfs debug messages
  and push them into Openstack's own logging system.  See code
  example below.

  ---------

  Here is how you enable logging programmatically and capture
  the log messages.

  (a) As soon as possible after creating the guestfs handle, call
  either (or better, both) of these functions:

  g.set_trace (1)         # just traces libguestfs API calls
  g.set_verbose (1)       # verbose debugging

  (b) Register an event handler like this:

  events = guestfs.EVENT_APPLIANCE | guestfs.EVENT_LIBRARY \
           | guestfs.EVENT_WARNING | guestfs.EVENT_TRACE
  g.set_event_callback (log_callback, events)

  (c) The log_callback function should look something like this:

  def log_callback (ev,eh,buf,array):
      if ev == guestfs.EVENT_APPLIANCE:
          buf = buf.rstrip()
      # What just happened?
      LOG.debug ("event=%s eh=%d buf='%s' array=%s" %
                 (guestfs.event_to_string (ev), eh, buf, array))

  There is a fully working example here:

  https://github.com/libguestfs/libguestfs/blob/master/python/t/420-log-
  messages.py

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