Puppet users - Aug 2012 - How to delete previous resources from directory

I''m using hiera to define a list of database engine id''s for a
node.  I''m
using this variable to feed into a defined type to create a set of files
(upstart configs).  The problem I would like to solve isŠ.

How do I delete files/resources that were previously created but are now
removed (without deleting files that are there by default)?

Here is an example (Please ignore syntax. I hope it''s clear what
I''m trying
to do.  If not, let me know).

/hiera/config.yaml
--------------------------------------------------------------
engines:
- 1
- 2

/modules/queue/manifests/upstart.pp
--------------------------------------------------------------
define upstart{
  file{"/etc/init/queue-$name.conf":
    ensure  => file,
    content => template(''queue/upstart.conf.erb''),
    # The below would be nice, but is not supported
    #purge  => true,
    #ignore => !(queue*)
  }
}

/modules/queue/manifests/init.pp
--------------------------------------------------------------
define queue {
  upstart::queue{hiera_lookup(''engines''):}
}

Puppet apply will create the following files correctly:
/etc/init/queue-1.conf
/etc/init/queue-2.conf

Now I update the hiera config file to only include 1 engine:

/hiera/config.yaml
--------------------------------------------------------------
engines:
- 1

But the /etc/init/queue02.conf file is not removed.

I can''t purge the directory because there are other scripts in that
directory that I do not want to remove.
If ruby supported extended globs I could use the purge and ignore parameters
to accomplish this.

Is there a good pattern for handling this?


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