[chef] How to check whether a package is installed ?

[Hui Hu < >]

Hi Chef,

Is there a simple chef way to check whether a package is installed or a service is running ?

For example, I want to write some code like this :

do-work if package('mypkg').installed?
do-work if service('mysvr').running?

I know we can do it by the code below, but it's bind to the specific platform. What I need is a platform independent way.

execute "..." do

  only_if "rpm -q mypkg"

  only_if "service mysvr status"

end

Thanks

Jesse Hu,  Project Serengeti