lib/shuttle/deployment/rails.rb in shuttle-deploy-0.2.0.beta12 vs lib/shuttle/deployment/rails.rb in shuttle-deploy-0.2.0.beta13

@@ -13,10 +13,14 @@
 
     def precompile_assets?
       config.rails && config.rails.precompile_assets != false
     end
 
+    def cache_assets?
+      config.rails && config.rails.cache_assets == true
+    end
+
     def start_server?
       if config.rails && !config.rails.start_server.nil?
         config.rails.start_server
       else
         true
@@ -41,13 +45,33 @@
       if res.failure?
         error "Unable to run rake command: #{command}. Reason: #{res.output}"
       end
     end
 
+    # Precompile rails assets. If no changes detected between last and 
+    # current releases, precompile task will be skipped.
     def precompile_assets
       if precompile_assets?
-        log "Precompiling assets"
-        rake 'assets:precompile'
+        precompile = true
+
+        # Detect if there any change in assets
+        if cache_assets? && last_version != version
+          old_path = deploy_path("releases/#{last_version}")
+          new_path = release_path
+
+          result = ssh.run("diff -arq #{old_path}/app/assets #{new_path}/app/assets")
+          if result.success?
+            precompile = false
+            ssh.run("cp -a #{old_path}/public/assets #{new_path}/public/")
+          end
+        end
+
+        if precompile
+          log "Precompiling assets"
+          rake 'assets:precompile'
+        else
+          log "Asset procompilation skipped"
+        end
       end
     end
 
     def deploy
       ssh.export('RACK_ENV', rails_env)
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