packer/test/fixtures/builder-lxc/minimal.json

{
  "variables": {
    "template_name": "debian",
    "template_parameters": "SUITE=jessie"
  },
  "builders": [
    {
      "type": "lxc",
      "name": "lxc-{{user `template_name`}}",
      "template_name": "{{user `template_name`}}",
      "config_file": "/usr/share/lxc/config/{{user `template_name`}}.common.conf",
      "template_environment_vars": [ "{{user `template_parameters`}}" ]
    }
  ]
}