output.txt

With Chef 12
------------
$ chef-apply subscribes.rb 
Recipe: (chef-apply cookbook)::(chef-apply recipe)
  * log[subscribed-log] action nothing (skipped due to action :nothing)
  * yum_package[nano] action install
    - install version 2.0.9-7.el6 of package nano

(Note that the logger has not been triggered after installing the package

With Chef 11
------------
$ chef-apply subscribes.rb 
Recipe: (chef-apply cookbook)::(chef-apply recipe)
  * log[subscribed-log] action nothing (skipped due to action :nothing)
  * package[nano] action install
    - install version 2.0.9-7.el6 of package nano
  * log[subscribed-log] action write

(Note that with Chef 11 subscription works as expected)

subscribes.rb

log "subscribed-log" do
    message "This is a subscribed log message"
    action :nothing
    subscribes :write, "package[nano]", :immediately
end

package "nano" do
    action :install
end