Install `consul`, when finding a newer version.

cookbooks/consul/install.rb

@@ -2,6 +2,7 @@
 # Calculating the latest `consul` version:
 # -------------------------------------------
 download_url = ''
+tag_version  = ''
 
 begin
   require 'net/http'
@@ -26,6 +27,9 @@ end
 # Main Part
 # -------------------------------------------
 
+# バージョン確認して、アップデート必要かどうか確認
+result = run_command("consul version | grep #{tag_version}", error: false)
+if result.exit_status != 0
   # Download:
   execute "wget #{download_url} -O #{node['consul']['tmp_path']}"
 
@@ -45,3 +49,5 @@ link '/usr/local/bin/consul' do
     user 'root'
     to '/opt/consul/bin/consul'
   end
+end
+