packer.json with ansible provisioner

packer.json

{
    "variables": {
        "unique_id": "{{env `UNIQUE_ID`}}",
        "ansible_path": "{{env `ANSIBLE_ROLES_PATH`}}",
        "playbook_path": "{{env `ANSIBLE_PLAYBOOK_PATH`}}",
        "ami": "{{ env `AMI`}}",
        "subnet_id": "{{env `SUBNET`}}",
        "vpc_id": "{{env `VPC`}}",
        "owner": "{{env `OWNER`}}",
        "ami_name": "{{env `AMI_NAME`}}",
        "ansible_skip_tags": "notscored",
        "source_ami": "{{env `SOURCE_AMI`}}",
        "datetime": "{{env `DATETIME`}}",
        "ansible_groups": "{{env `ANSIBLE_GROUPS`}}",
        "ami_users": "{{env `PACKER_AMI_USERS`}}",
        "root_volume_size": "{{env `ROOT_SIZE`}}",
        "iam_instance_profile": "{{env `IAM_ROLE`}}",
        "extra_vars": "{{env `ANSIBLE_EXTRA_VARS`}}",
        "CI_BUILD_REF": "{{env `CI_BUILD_REF`}}",
        "CI_BUILD_TAG": "{{env `CI_BUILD_TAG`}}",
        "CI_BUILD_REF_NAME": "{{env `CI_BUILD_REF_NAME`}}",
        "CI_BUILD_ID": "{{env `CI_BUILD_ID`}}",
        "ami_source_name": "{{env `SOURCE_AMI_SOURCE_NAME`}}",
        "ami_os": "{{env `SOURCE_AMI_OS`}}"
    },
    "builders": [
        {
            "name": "{{ user `ami_os` }}",
            "type": "amazon-ebs",
            "region": "eu-west-1",
            "source_ami": "{{ user `source_ami` }}",
            "instance_type": "t2.large",
            "ami_name": "{{ user `ami_name` }}_{{ user `datetime` }}",
            "ami_users": "{{ user `ami_users` }}",
            "vpc_id": "{{ user `vpc_id` }}",
            "subnet_id": "{{ user `subnet_id` }}",
            "security_group_ids": [
                "sg-1",
                "sg-2"
            ],
            "iam_instance_profile": "{{ user `iam_instance_profile` }}",
            "launch_block_device_mappings": [
                {
                    "device_name": "/dev/sda1",
                    "volume_type": "gp2",
                    "delete_on_termination": true,
                    "volume_size": "{{ user `root_volume_size`}}"
                }
            ],
            "ami_block_device_mappings": [
                {
                    "device_name": "/dev/sda1",
                    "volume_type": "gp2",
                    "volume_size": "{{ user `root_volume_size`}}"
                }
            ],
            "associate_public_ip_address": false,
            "ssh_file_transfer_method": "sftp",
            "ssh_private_ip": true,
            "ssh_username": "ec2-user",
            "user_data_file": "{{template_dir}}/ec2_user_data.txt",
            "run_tags": {
                "Name": "temporary packer build {{ user `ami_name` }}",
                "source": "{{ user `ami_os` }}-{{user `ami_source_name`}}-{{ user `source_ami` }}",
                "owner": "{{ user `owner` }}",
                "uuid": "{{ user `unique_id` }}",
                "os": "{{ user `ami_os` }}",
                "CI_BUILD_REF": "{{user `CI_BUILD_REF`}}",
                "packer": "true"
            },
            "tags": {
                "purpose": "{{ user `ami_name` }}",
                "source": "{{user `ami_os`}}-{{user `ami_source_name`}}-{{ user `ami` }}",
                "owner": "{{ user `owner` }}",
                "uuid": "{{ user `unique_id` }}",
                "os": "{{user `ami_os`}}",
                "CI_BUILD_REF": "{{user `CI_BUILD_REF`}}",
                "CI_BUILD_TAG": "{{user `CI_BUILD_TAG`}}",
                "CI_BUILD_REF_NAME": "{{user `CI_BUILD_REF_NAME`}}",
                "CI_BUILD_ID": "{{user `CI_BUILD_ID`}}",
                "packer": "true"
            }
        }
    ],
    "provisioners": [
        {
            "type": "ansible",
            "playbook_file": "{{ user `playbook_path` }}/{{ user `ami` }}.yml",
            "sftp_command": "/usr/libexec/openssh/sftp-server -e",
            "groups": "{{user `ansible_groups`}}",
            "user": "ec2-user",
            "ansible_env_vars": [
                "ANSIBLE_VAULT_PASSWORD_FILE=.ansible_vault_password",
                "ANSIBLE_HOST_KEY_CHECKING=False",
                "ANSIBLE_ROLES_PATH={{ user `ansible_path` }}",
                "ANSIBLE_FORCE_COLOR=True",
                "ANSIBLE_HASH_BEHAVIOUR=merge",
                "ANSIBLE_SSH_PIPELINING=True",
                "PYTHONUNBUFFERED=1",
                "ANSIBLE_STDOUT_CALLBACK=debug",
                "ANSIBLE_CALLBACK_WHITELIST=profile_tasks",
                "CI_BUILD_REF={{user `CI_BUILD_REF`}}",
                "CI_BUILD_TAG={{user `CI_BUILD_TAG`}}",
                "CI_BUILD_REF_NAME={{user `CI_BUILD_REF_NAME`}}",
                "CI_BUILD_ID={{user `CI_BUILD_ID`}}"
            ],
            "extra_arguments": [
                "--skip-tags",
                "{{ user `ansible_skip_tags` }}"
            ]
        }
    ],
    "post-processors": [
        {
            "type": "vagrant",
            "output": "{{ user `ami_name` }}.box"
        }
    ]
}