[Bug 1124384] Re: Configuration reload clears event that others jobs may be waiting on

[Steve Langasek]

On Wed, May 01, 2013 at 12:11:19AM -0000, Dmitrijs Ledkovs wrote:
> To fix stateful re-execution in early boot, we need to serialise all
> objects used by upstart which upstream has avoided to do so far. Also
> it's questionable if stateful re-execution in early boot is a desired
> requirement.

No, it isn't.  cloud-init needs to be able to run a dist-upgrade of
arbitrary packages, including upstart and core libraries, prior to starting
services in a cloud instance.

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https://bugs.launchpad.net/bugs/1124384

Title:
  Configuration reload clears event that others jobs may be waiting on

Status in “cloud-init” package in Ubuntu:
  Confirmed
Status in “upstart” package in Ubuntu:
  Confirmed

Bug description:
  Under bug 1080841 we made cloud-init invoke 'initctl reload-
  configuration' after it wrote a upstart job.  This was necessary
  because inotify is not supported on all filesystems (overlayfs being
  the one of most current interst).

  This seems to be causing upstart some pain, and resulting in cloud-
  final (and 'rc') not being run.

  Easy user-data to reproduce the problem is:

  #cloud-config-archive
  - content: |
     #cloud-boothook
     #!/bin/sh
     touch /run/cloud-init-upstart-reload  # hack, see trunk commit 783
  - content: |
     #!/bin/sh
     echo "==== $(date -R): user-script run ===" | tee /run/user-script.log
  - content: |
     #upstart-job
     description "a test upstart job"
     start on stopped rc RUNLEVEL=[2345]
     console output
     task
     script
     echo "==== $(date -R): upstart job run ===" | tee /run/upstart-job.log
     end script

  You should (and do on quantal) end up with 2 files written to /run.

  I've verified that the same behavior is true on quantal.  If you
  change cloud-init to notify upstart about a job immediately after it
  writes it, then quantal's upstart gets confused also.

  Related bugs:
   * bug 1080841: should reload configuration if an upstart job is added
   * bug 1103881: cloud-final is never executed if upstart is upgraded during initialization of the image

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