[chef] How to execute a command block only if previous block succeed?

[howard chen < >]

I have written a custom provider, foo

action :helloworld do

...

end

And in my recipe, I have lines..

foo "bar" do

  action : helloworld

end

..

..

execute "bye" do

  command "xxx"

  action :run

end

How to make my last execute block run only if my custom provider "foo" is executed correctly?

i.e. How to make my helloworld action return success/error status and such that the later block can make use of this value?

Thanks.