Github user rvesse commented on a diff in the pull request:

    https://github.com/apache/spark/pull/23053#discussion_r234968357
  
    --- Diff: bin/docker-image-tool.sh ---
    @@ -41,6 +41,18 @@ function image_ref {
       echo "$image"
     }
     
    +function docker_push {
    +  local image_name="$1"
    +  if [ ! -z $(docker images -q "$(image_ref ${image_name})") ]; then
    +    docker push "$(image_ref ${image_name})"
    +    if [ $? -ne 0 ]; then
    +      error "Failed to push $image_name Docker image."
    --- End diff --
    
    Script should really fail i.e. `exit` if a push fails


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