Configure Redis cache for all environments

Also add support for connecting to Redis with Unix sockets.

config/environments/production.rb

@@ -45,16 +45,6 @@ Gitlab::Application.configure do
   # Use a different logger for distributed setups
   # config.logger = ActiveSupport::TaggedLogging.new(SyslogLogger.new)
 
-  # Use a different cache store in production
-  config_file = Rails.root.join('config', 'resque.yml')
-
-  resque_url = if File.exists?(config_file)
-                 YAML.load_file(config_file)[Rails.env]
-               else
-                 "redis://localhost:6379"
-               end
-  config.cache_store = :redis_store, resque_url, {namespace: 'cache:gitlab'}
-
   # Enable serving of images, stylesheets, and JavaScripts from an asset server
   # config.action_controller.asset_host = "http://assets.example.com"
 

config/initializers/7_cache_settings.rb

+redis_config_file = Rails.root.join('config', 'resque.yml')
+
+resque_url = if File.exists?(redis_config_file)
+               YAML.load_file(redis_config_file)[Rails.env]
+             else
+               "redis://localhost:6379"
+             end
+
+# Redis::Store does not handle Unix sockets well, so let's do it for them
+redis_config_hash = Redis::Store::Factory.extract_host_options_from_uri(resque_url)
+redis_uri = URI.parse(resque_url)
+if redis_uri.scheme == 'unix'
+  redis_config_hash[:path] = redis_uri.path
+end
+
+redis_config_hash[:namespace] = 'cache:gitlab'
+
+Gitlab::Application.config.cache_store = :redis_store, redis_config_hash