[chef] Re: Changing attributes in provider

[Lamont Granquist < >]

The provider only gets run at converge time (late), the references that 
you're using to that attribute later are running at compile time 
(early).

For what you're trying to do this is probably the worst available 
option.  If you need to pass attributes from one recipe to another the 
first choice is using attribute files (particularly if they are 
consumed by later resources and you're not trying to dep inject 
computed attributes into earlier recipes).  To pass state between 
recipes you can also use the node.run_state instead of using 
attributes.  And if all you are doing is writing some DSL sauce around 
setting attributes you should probably use a definition (compile time 
macro) instead of a provider.  The other direction you could go is to 
not consume the attributes directly in compile mode in recipes and wrap 
the later consumers of the node attributes in a provider in which case 
they'll also be called at converge time after the earlier provider sets 
the value.  You can also use lazy {} on the later attribute, although 
if you adopt this pattern generally like it seems like you might be 
trying to do this tends to wind up with lazy {} everywhere in your 
recipes which bypasses the resource input validation (and in some cases 
we have bugs where the input validation on the resource fails on a lazy 
block).

On Thu Nov  6 11:09:40 2014, Sergey Motovilovets wrote:
> Hi
>
> Need some help here
> I'm trying to implement provider which is supposed to update node
> attributes
> Recipe has something like
>
> /resource_name 'foo' do/
> /  action :get/
> /  destination node.override[:test]/
> /end/
>
> Provider draft:
> /.../
> /def destination/
> /    new_resource.destination/
> /end/
> /.../
> /destination.update( {"foo" => "bar"} )
> /
> /.../
>
> When I call
> /Chef::Log.info node[:test]/
> from provider - it echoes {"foo"=>"bar"}, just as supposed to
> But following actions in a recipe can see no changes in this
> attribute, it remains empty