docker.rb in kitchen-docker-2.3.0

- old
+ new

@@ -64,10 +64,14 @@
         driver.default_platform
       end
 
       default_config :disable_upstart, true
 
+      default_config :build_context do |driver|
+        !driver.remote_socket?
+      end
+
       def verify_dependencies
         run_command("#{config[:binary]} >> #{dev_null} 2>&1", :quiet => true)
         rescue
           raise UserError,
           'You must first install the Docker CLI tool http://www.docker.io/gettingstarted/'
@@ -241,13 +245,15 @@
       end
 
       def build_image(state)
         cmd = "build"
         cmd << " --no-cache" unless config[:use_cache]
+        dockerfile_contents = dockerfile
+        build_context = config[:build_context] ? '.' : '-'
         output = Tempfile.create('Dockerfile-kitchen-', Dir.pwd) do |file|
-          file.write(dockerfile)
+          file.write(dockerfile_contents)
           file.close
-          docker_command("#{cmd} -f #{file.path} .")
+          docker_command("#{cmd} -f #{file.path} #{build_context}", :input => dockerfile_contents)
         end
         parse_image_id(output)
       end
 
       def parse_container_id(output)