[chef] Re: Re: Re: Re: Re: updated_by_last action from a resource inside a LWP

[Phil Dibowitz < >]

On Tue, Jul 17, 2012 at 11:47:40AM +1000, Peter Donald wrote:
> Hi,
> 
> On Tue, Jul 17, 2012 at 1:30 AM,  
> <
 >
>  wrote:
> > yfeldblum pointed me to a great pattern for dealing with this.  Here is 
> > the
> > gist
> >
> > https://gist.github.com/d85be145f3ff824ccc07/0e97d44f20ec65411b141cb46cbeb19bb34b44ad
> >
> > The general idea is you cache your current run_context, create a new one, 
> > blank
> > out the resource collection, perform all your resource actions.  Then you
> > restore the run_context back to the original and converge on the new run
> > context you created.  This sub run context contains the subset of 
> > resources
> > acted upon in your provider.  Then you call converge on the sub run 
> > context and
> > check each of its resources to see if they were updated.  If any did get
> > updated you pass that along to your new_resource.
> >
> > Awesome and nifty.  I implemented in my redisio cookbook in the install
> > provider and it seems to work great.
> 
> Awesome indeed. I have tested it out and it works fine and dandy for
> me. Except we have lots of LWRPs so doing this everytime would be
> tiresome. I abstracted the essential goodness into a method
> notifying_action and now most of my providers look something like
> 
> notifying_action :run do
>   file "/tmp/something" do
>     owner "root"
>     group "root"
>     mode "0755"
>     action :create
>   end
> end
> 
> Much nicer!
> 
> Anyhoo I documented for posterity at
> 
> http://realityforge.org/code/2012/07/17/lwrp-notify-on-changed-resources.html

Nice, I've grabbed this for my use. Thanks!

We should probably work this into LWRPs natively at some point.

-- 
Phil Dibowitz                             

 
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