{
  "variables": {
    "template_name": "debian",
    "template_parameters": "SUITE=jessie",
    "container_name": "packer-lxc",
    "set_var": "hello"
  },
  "provisioners": [
    {
      "type": "shell",
      "inline": [
        "if [ \"$SET_VAR\" != \"{{user `set_var`}}\" ]; then",
        "   echo \"Got unexpected value '$SET_VAR' for SET_VAR\" 1>&2",
        "   exit 1",
        "fi"
      ]
    }
  ],
  "builders": [
    {
      "type": "lxc",
      "name": "lxc-{{user `template_name`}}",
      "template_name": "{{user `template_name`}}",
      "container_name": "{{user `container_name`}}",
      "create_options": [ "-f", "{{user `init_config`}}" ],
      "attach_options": [ "--clear-env", "--set-var", "SET_VAR={{user `set_var`}}" ],
      "config_file": "/usr/share/lxc/config/{{user `template_name`}}.common.conf",
      "template_environment_vars": [ "{{user `template_parameters`}}" ]
    }
  ]
}