Hi,

Suppose I have a role called Ruby. I will 
1. install build tools
2. download ruby source
3. compile
4. install

Because it takes long time to do all these tings and I don't want to it it 
the expected Ruby already installed.

How could I do it?

I could do it using the "when" condition on every step. like the following:

- name: check if ruby installed
  shell: ls /opt/rubies
  register: ruby_installed

- name: install dependencies
  apt: name =....
  when: ruby_installed.stdout.find(ruby_full_version) == -1

Wonder if there is any better solution? like a precondition for all the 
tasks in a role?

Also I found it would be convenient if we have module like Java, Ruby to 
install various version of the packages. Like Chef they have Java cookbook.

Any suggestion is really appreciated.

Cheers,
Rui

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