Packer condistional ansibl-local provisioner w/ variable

analytics.json

{
  "variables": {
    "aws_access_key": "",
    "aws_secret_key": "",
    "build_type": "general"
  },
  "builders": [{
    "type": "amazon-ebs",
    "access_key": "{{user `aws_access_key`}}",
    "secret_key": "{{user `aws_secret_key`}}",
    "region": "us-east-1",
    "source_ami": "ami-321",
    "instance_type": "t2.medium",
    "ssh_username": "ubuntu",
    "ami_name": "analytics-toolkit-{{isotime \"2006-01-02-15-04-05\"}}-{{user `build_type`}}",
    "vpc_id": "vpc-123",
    "subnet_id": "subnet-123",
    "associate_public_ip_address": "true"
  }],
  "provisioners": [
    {
      "type": "shell",
      "inline": ["sudo apt-get install -y software-properties-common",
                 "sudo apt-add-repository -y ppa:ansible/ansible",
                 "sudo apt-get update",
                 "sudo apt-get install -y ansible"]
    },
    {
      "type": "ansible-local",
      "command": "[[ \"{{user `build_type`}}\" == \"general\" ]] && ANSIBLE_FORCE_COLOR=1 PYTHONUNBUFFERED=1 ansible-playbook",
      "playbook_dir": "ansible/",
      "playbook_file": "ansible/analytics_user.yml"
    }
  ]
}

try.sh

# Goal is an ansible-local provisioner that will compare the value of a variable
# and run if it's matches a specific string (e.g., "general") but exit 0 otherwise (i.e., not run the provisioner)
# I can get it to run when equality is true
$ packer build analytics.json
...
    amazon-ebs: Executing Ansible: cd /tmp/packer-provisioner-ansible-local && [[ "general" == "general" ]] && ANSIBLE_FORCE_COLOR=1 PYTHONUNBUFFERED=1 ansible-playbook /tmp/packer-provisioner-ansible-local/analytics_user.yml -c local -i /tmp/packer-provisioner-ansible-local/packer-provisioner-ansible-local186516603
...

==> amazon-ebs: Creating the AMI: analytics-toolkit-2016-05-06-16-14-54-general
    amazon-ebs: AMI: ami-123
==> amazon-ebs: Waiting for AMI to become ready...
==> amazon-ebs: Terminating the source AWS instance...
==> amazon-ebs: Cleaning up any extra volumes...
==> amazon-ebs: Deleting temporary security group...
==> amazon-ebs: Deleting temporary keypair...
Build 'amazon-ebs' finished.

==> Builds finished. The artifacts of successful builds are:
--> amazon-ebs: AMIs were created:

us-east-1: ami-123

# however when equality is false (i.e., I modified analytics.json changing "general" to "gneral")
# I can't figure out how to get the conditional check to exit 0
$ packer build analytics.json
...
    amazon-ebs: Executing Ansible: cd /tmp/packer-provisioner-ansible-local && [[ "general" == "gneral" ]] && ANSIBLE_FORCE_COLOR=1 PYTHONUNBUFFERED=1 ansible-playbook /tmp/packer-provisioner-ansible-local/analytics_user.yml -c local -i /tmp/packer-provisioner-ansible-local/packer-provisioner-ansible-local625270349
==> amazon-ebs: Terminating the source AWS instance...
==> amazon-ebs: No AMIs to cleanup
==> amazon-ebs: Deleting temporary security group...
==> amazon-ebs: Deleting temporary keypair...
Build 'amazon-ebs' errored: Error executing Ansible: Non-zero exit status: 1

==> Some builds didn't complete successfully and had errors:
--> amazon-ebs: Error executing Ansible: Non-zero exit status: 1

==> Builds finished but no artifacts were created.