How to pass value from one resource to another resource in chef recipe?

Question

I am trying to change an attribute in one resource and want to use updated value in another resource but updated value is not getting reflected in another resources. please help

Answer 1

Your problem is that the code variable is set during the compile phase of chef, before the ruby block has changed the value of your attribute. You need to add a lazy initializer around your code block.

Chef::Log.info("I am in #{cookbook_name}::#{recipe_name} and current disk count #{node[:oracle][:asm][:test]}") 

bash "beforeTest" do
  code lazy{ "echo #{node[:oracle][:asm][:test]}" }
end

ruby_block "test current disk count" do
  block do
    node.set[:oracle][:asm][:test] = "#{node[:oracle][:asm][:test]}".to_i+1
  end
end

bash "test" do
  code lazy{ "echo #{node[:oracle][:asm][:test]}" }
end

The first block doesn't really need the lazy, but I threw it in there just in case the value is changing elsewhere too.

Answer 2

Lazy is good, but here is another approach. You may use node.run_state for your purposes.

Here is usage example from https://docs.chef.io/recipes.html

package 'httpd' do
  action :install
end

ruby_block 'randomly_choose_language' do
  block do
    if Random.rand > 0.5
      node.run_state['scripting_language'] = 'php'
    else
      node.run_state['scripting_language'] = 'perl'
    end
  end
end

package 'scripting_language' do
  package_name lazy { node.run_state['scripting_language'] }
  action :install
end