packer file for creating an AMI image with ansible provisioning

packer.json

{
 "variables": {
 "aws_access_key": "",
 "aws_secret_key": ""
 },

"provisioners": [
 {
 "type": "shell",
 "execute_command": "echo 'ubuntu' | {{ .Vars }} sudo -E -S sh '{{ .Path }}'",
 "inline": [
 "sleep 30",
 "apt-add-repository ppa:ansible/ansible -y",
 "/usr/bin/apt-get update",
 "/usr/bin/apt-get -y install ansible",
 "mkdir /home/ubuntu/node-app",
 "chown ubuntu:ubuntu /home/ubuntu/node-app"
 ]
 },
 {
 "type": "file",
 "source": ".",
 "destination": "/home/ubuntu/node-app/"
 },
 {
 "type": "ansible-local",
 "playbook_file": "packer/ansible-playbook.yml"
 }
 ],

"builders": [{
 "type": "amazon-ebs",
 "access_key": "{{user `aws_access_key`}}",
 "secret_key": "{{user `aws_secret_key`}}",
 "region": "us-east-1",
 "source_ami_filter": {
 "filters": {
 "virtualization-type": "hvm",
 "name": "ubuntu/images/*ubuntu-trusty-14.04-amd64-server-*",
 "root-device-type": "ebs"
 },
 "owners": ["099720109477"],
 "most_recent": true
 },
 "instance_type": "t2.micro",
 "ssh_username": "ubuntu",
 "ami_name": "packer-viresh {{timestamp}}",
 "launch_block_device_mappings": [{
 "device_name": "/dev/sda1",
 "volume_size": 8,
 "volume_type": "gp2",
 "delete_on_termination": true
 }]
 }]
}