roles/ruby: バージョンなど別ファイルへ

roles/ruby/tasks/main.yml

 ---
+- name: is exists source archive
+  command: ls -l "{{ruby_src_archive}}"
+  ignore_errors: true
+  register: already_downloaded
+
+- name: already installed
+  command: which ruby
+  ignore_errors: true
+  register: already_installed
+
 - name: download and extract
   unarchive: 
-    src: https://cache.ruby-lang.org/pub/ruby/2.1/ruby-2.1.8.tar.gz
-    dest: /tmp/
+    src: "{{ruby_src_url}}"
+    dest: "{{src_dir}}"
     copy: no
+  when: not already_downloaded
 
 - name: configure
-  command: /tmp/ruby-2.1.8/configure --prefix=/usr/
+  command: ./configure --prefix=/usr/
   args: 
-    chdir: /tmp/ruby-2.1.8
+    chdir: "{{ruby_src_dir}}"
+  when: not already_downloaded or not already_installed
 
 - name: make
   command: /usr/bin/make
   args:
-    chdir: /tmp/ruby-2.1.8
+    chdir: "{{ruby_src_dir}}"
+  when: not already_downloaded or not already_installed
 
 - name: install
   command: /usr/bin/make install
   args:
     chdir: /tmp/ruby-2.1.8
   become: yes
+  when: not already_downloaded or not already_installed
 

roles/ruby/vars/main.yml

+---
+ruby_version: 2.1.8
+ruby_dir: "ruby-{{ruby_version}}"
+src_dir: /usr/local/src
+ruby_src_dir: "/usr/local/src/{{ruby_dir}}"
+ruby_src_archive: "{{ruby_src_dir}}.tar.gz"
+ruby_src_url: "https://cache.ruby-lang.org/pub/ruby/2.1/{{ruby_dir}}.tar.gz"
+