Suppress "No such file or directory" output

The full message is “cat: /proc/1/cgroup: No such file or directory”.
KaranN · May 17, 2016 · dd0ab6c · dd0ab6c
1 parent 050b5bd
commit dd0ab6c
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/lib/active_elastic_job/rack/sqs_message_consumer.rb b/lib/active_elastic_job/rack/sqs_message_consumer.rb
@@ -19,7 +19,7 @@ class SqsMessageConsumer
       CONTENT_TYPE = 'application/json'.freeze
       CONTENT_TYPE_HEADER_NAME = 'Content-Type'.freeze
       OK_RESPONSE_CODE = '200'.freeze
-      INSIDE_DOCKER_CONTAINER = `cat /proc/1/cgroup` =~ /docker/
+      INSIDE_DOCKER_CONTAINER = `[ -f /proc/1/cgroup ] && cat /proc/1/cgroup` =~ /docker/
       DOCKER_HOST_IP = "172.17.0.1".freeze
 
       def initialize(app) #:nodoc: