gistfile1.txt

{
  "_comment": ["2006-01-02 15:04:05 is a magic reference date for isotime",
               "more info at https://www.packer.io/docs/templates/configuration-templates.html"],
  "variables": {
    "ami_type": "{{env `AMI_TYPE`}}",
    "ami_prefix": "{{env `AMI_PREFIX`}}",
    "source_ami": "{{env `SOURCE_AMI`}}",
    "ssh_keypair_name": "{{env `SSH_KEYPAIR_NAME`}}",
    "ssh_private_key_file": "{{env `SSH_PRIVATE_KEY_FILE`}}",
    "git_hash": ""
  },
  "builders": [
    { 
      "ami_name": "{{user `ami_prefix`}}-{{user `ami_type`}}-{{isotime \"2006-01-02-1504\"}}-{{user `git_hash`}}",
      "iam_instance_profile": "ami-generate",
      "instance_type": "m4.large",
      "region": "{{user `region`}}",
      "source_ami": "{{user `source_ami`}}",
      "ssh_keypair_name": "{{user `ssh_keypair_name`}}",
      "ssh_private_key_file": "{{user `ssh_private_key_file`}}",
      "ssh_username": "ubuntu",
      "subnet_id": "{{user `subnet_id`}}",
      "type": "amazon-ebs",
      "vpc_id": "{{user `vpc_id`}}",
      "tags": {
        "Name": "{{user `ami_type`}}-ami",
        "OS": "ubuntu-1604",
        "TestStatus": "Pass"
      },
      "run_tags": {
        "Name": "{{user `ami_prefix`}}-{{user `ami_type`}}-packer-instance",
      }
    }
  ],  
  "provisioners": [
    {  
      "type": "shell",
      "inline": [
        "sudo apt-get update",
        "sudo apt-get install -y python-minimal aptitude",
        "sudo systemctl mask apt-daily.service"
      ]
    },
    { 
      "type": "ansible",
      "playbook_file": "./{{user `ami_type`}}-ami.yml",
      "user": "ubuntu",
      "ansible_env_vars": ["ANSIBLE_ROLES_PATH=../roles/"]
    }
  ]
}