Added CentOS 6.x support.

lib/capistrano/tasks/unicorn.rake

@@ -22,6 +22,8 @@ namespace :load do
     set :unicorn_logrotate_enabled, false # by default, don't use logrotate to rotate unicorn logs
 
     set :linked_dirs, fetch(:linked_dirs, []).push('log', 'tmp/pids')
+    set :detect_os_script_name, 'detect_os.sh'
+    set :detect_os_remote_script_path, "#{fetch(:tmp_dir)}/#{fetch(:application)}/detect_os.sh"
   end
 end
 
@@ -34,11 +36,16 @@ namespace :unicorn do
   end
 
   desc 'Setup Unicorn initializer'
-  task :setup_initializer do
+  task :setup_initializer => :upload_os_detection_script do
     on roles :app do
       sudo_upload! template('unicorn_init.erb'), unicorn_initd_file
       execute :chmod, '+x', unicorn_initd_file
-      sudo 'update-rc.d', '-f', fetch(:unicorn_service), 'defaults'
+      case capture(fetch(:detect_os_remote_script_path)).downcase
+        when 'centos'
+          sudo 'chkconfig', fetch(:unicorn_service), 'on'
+        when 'ubuntu'
+          sudo 'update-rc.d', '-f', fetch(:unicorn_service), 'defaults'
+      end
     end
   end
 
@@ -68,6 +75,15 @@ namespace :unicorn do
     end
   end
 
+  desc 'Upload OS detection script.'
+  task :upload_os_detection_script do
+    on roles :app do
+      execute :mkdir, '-p', "#{fetch(:tmp_dir)}/#{fetch(:application)}/"
+      upload! File.join(File.dirname(__FILE__), "../../scripts/#{fetch(:detect_os_script_name)}"), fetch(:detect_os_remote_script_path)
+      execute :chmod, '+x', fetch(:detect_os_remote_script_path)
+    end
+  end
+
   before :setup_initializer, :defaults
   before :setup_logrotate, :defaults
 

lib/scripts/detect_os.sh

@@ -0,0 +1,16 @@
+#!/bin/bash
+
+#Refer to https://github.com/puppetlabs/facter/blob/master/lib/facter/operatingsystem/linux.rb if additional
+#operating systems need to be supported or more specific information about the operating system is required.
+
+if [[ $(lsb_release -is 2>/dev/null) == "Ubuntu" ]]; then
+  echo "Ubuntu"
+  exit 0
+else
+  if [[ -e "/etc/redhat-release" ]]; then
+    echo "$(cat /etc/redhat-release | cut -d " " -f1)"
+    exit 0
+  fi
+fi
+
+exit 1