Docker Error - “jq: error: Cannot iterate over null”

Question

So I\'m trying to deploy a dockerfile on Elastic Beanstalk, but I can\'t get past this error - \"jq: error: Cannot iterate over null\".

Successfully built [         


        

Answer 1

If others are looking for how to avoid the Cannot iterate over null error in their own jq commands, add a question mark after []. For example

echo '{
  "AWSEBDockerrunVersion": "1",
  "Image": {
    "Name": "blah",
    "Update": "false"
  },
  "Ports": [
    {
      "ContainerPort": "8080"
    }
  ]
}'|jq -c '.Volumes[]?|[.HostDirectory,.ContainerDirectory]'

where [] was replaced with []? does not display the error.

From the manual:

.[]?
    Like .[], but no errors will be output if . is not an array or object.