[chef] Re: Chef and find a json file generated from a previous recipe

[Noah Kantrowitz < >]

On Jun 2, 2015, at 4:33 PM, David Montgomery 
<
 >
 wrote:

> Thanks,
> 
> But is there a solution?  I have to use my python to generate the json 
> file.  I leave if 
> File.exists?("#{Chef::Config[:file_cache_path]}/zookeeper_hosts") I get a 
> chef error and fails and not very pretty to have to run chef twice. Is this 
> the best chef can do?
> 

Delay the file read until converge time:

template "/etc/zookeeper/conf/zoo.cfg" do
  path "/etc/zookeeper/conf/zoo.cfg"
  source "cloudera.zoo.cfg.erb"
  owner "root"
  group "root"
  mode "0644"
  variables lazy { { :zookeeper =>  
File.read("#{Chef::Config[:file_cache_path]}/zookeeper_hosts") } }
  notifies :restart, resources(:service => "zookeeper-server")
end

The lazy {} helper puts off evaluating a resource property until the first 
time it is used, which in this case should be after the file is written. You 
could also do a similar thing using the node.run_state hash to avoid the time 
cost or writing/reading a file. Overall this kind of coupling should be 
avoided though, cookbooks should be self-contained.

--Noah

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